1. 12 Dec, 2012 40 commits
    • Linus Torvalds's avatar
      Merge branch 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · 37ea95a9
      Linus Torvalds authored
      Pull RCU update from Ingo Molnar:
       "The major features of this tree are:
      
           1. A first version of no-callbacks CPUs.  This version prohibits
              offlining CPU 0, but only when enabled via CONFIG_RCU_NOCB_CPU=y.
              Relaxing this constraint is in progress, but not yet ready
              for prime time.  These commits were posted to LKML at
              https://lkml.org/lkml/2012/10/30/724.
      
           2. Changes to SRCU that allows statically initialized srcu_struct
              structures.  These commits were posted to LKML at
              https://lkml.org/lkml/2012/10/30/296.
      
           3. Restructuring of RCU's debugfs output.  These commits were posted
              to LKML at https://lkml.org/lkml/2012/10/30/341.
      
           4. Additional CPU-hotplug/RCU improvements, posted to LKML at
              https://lkml.org/lkml/2012/10/30/327.
              Note that the commit eliminating __stop_machine() was judged to
              be too-high of risk, so is deferred to 3.9.
      
           5. Changes to RCU's idle interface, most notably a new module
              parameter that redirects normal grace-period operations to
              their expedited equivalents.  These were posted to LKML at
              https://lkml.org/lkml/2012/10/30/739.
      
           6. Additional diagnostics for RCU's CPU stall warning facility,
              posted to LKML at https://lkml.org/lkml/2012/10/30/315.
              The most notable change reduces the
              default RCU CPU stall-warning time from 60 seconds to 21 seconds,
              so that it once again happens sooner than the softlockup timeout.
      
           7. Documentation updates, which were posted to LKML at
              https://lkml.org/lkml/2012/10/30/280.
              A couple of late-breaking changes were posted at
              https://lkml.org/lkml/2012/11/16/634 and
              https://lkml.org/lkml/2012/11/16/547.
      
           8. Miscellaneous fixes, which were posted to LKML at
              https://lkml.org/lkml/2012/10/30/309.
      
           9. Finally, a fix for an lockdep-RCU splat was posted to LKML
              at https://lkml.org/lkml/2012/11/7/486."
      
      * 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (49 commits)
        context_tracking: New context tracking susbsystem
        sched: Mark RCU reader in sched_show_task()
        rcu: Separate accounting of callbacks from callback-free CPUs
        rcu: Add callback-free CPUs
        rcu: Add documentation for the new rcuexp debugfs trace file
        rcu: Update documentation for TREE_RCU debugfs tracing
        rcu: Reduce default RCU CPU stall warning timeout
        rcu: Fix TINY_RCU rcu_is_cpu_rrupt_from_idle check
        rcu: Clarify memory-ordering properties of grace-period primitives
        rcu: Add new rcutorture module parameters to start/end test messages
        rcu: Remove list_for_each_continue_rcu()
        rcu: Fix batch-limit size problem
        rcu: Add tracing for synchronize_sched_expedited()
        rcu: Remove old debugfs interfaces and also RCU flavor name
        rcu: split 'rcuhier' to each flavor
        rcu: split 'rcugp' to each flavor
        rcu: split 'rcuboost' to each flavor
        rcu: split 'rcubarrier' to each flavor
        rcu: Fix tracing formatting
        rcu: Remove the interface "rcudata.csv"
        ...
      37ea95a9
    • Linus Torvalds's avatar
      Merge branches 'core-locking-for-linus' and 'timers-urgent-for-linus' of... · de0c276b
      Linus Torvalds authored
      Merge branches 'core-locking-for-linus' and 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
      
      Pull trivial fix branches from Ingo Molnar.
      
      Cleanup in __get_key_name, and a timer comment fixlet.
      
      * 'core-locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
        lockdep: Use KSYM_NAME_LEN'ed buffer for __get_key_name()
      
      * 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
        timers, sched: Correct the comments for tick_sched_timer()
      de0c276b
    • Linus Torvalds's avatar
      Merge branch 'akpm' (Andrew's patchbomb) · 608ff1a2
      Linus Torvalds authored
      Merge misc updates from Andrew Morton:
       "About half of most of MM.  Going very early this time due to
        uncertainty over the coreautounifiednumasched things.  I'll send the
        other half of most of MM tomorrow.  The rest of MM awaits a slab merge
        from Pekka."
      
      * emailed patches from Andrew Morton: (71 commits)
        memory_hotplug: ensure every online node has NORMAL memory
        memory_hotplug: handle empty zone when online_movable/online_kernel
        mm, memory-hotplug: dynamic configure movable memory and portion memory
        drivers/base/node.c: cleanup node_state_attr[]
        bootmem: fix wrong call parameter for free_bootmem()
        avr32, kconfig: remove HAVE_ARCH_BOOTMEM
        mm: cma: remove watermark hacks
        mm: cma: skip watermarks check for already isolated blocks in split_free_page()
        mm, oom: fix race when specifying a thread as the oom origin
        mm, oom: change type of oom_score_adj to short
        mm: cleanup register_node()
        mm, mempolicy: remove duplicate code
        mm/vmscan.c: try_to_freeze() returns boolean
        mm: introduce putback_movable_pages()
        virtio_balloon: introduce migration primitives to balloon pages
        mm: introduce compaction and migration for ballooned pages
        mm: introduce a common interface for balloon pages mobility
        mm: redefine address_space.assoc_mapping
        mm: adjust address_space_operations.migratepage() return code
        arch/sparc/kernel/sys_sparc_64.c: s/COLOUR/COLOR/
        ...
      608ff1a2
    • Lai Jiangshan's avatar
      memory_hotplug: ensure every online node has NORMAL memory · 74d42d8f
      Lai Jiangshan authored
      Old memory hotplug code and new online/movable may cause a online node
      don't have any normal memory, but memory-management acts bad when we have
      nodes which is online but don't have any normal memory.  Example: it may
      cause a bound task fail on all kernel allocation and cause the task can't
      create task or create other kernel object.
      
      So we disable non-normal-memory-node here, we will enable it when we
      prepared.
      Signed-off-by: default avatarLai Jiangshan <laijs@cn.fujitsu.com>
      Signed-off-by: default avatarWen Congyang <wency@cn.fujitsu.com>
      Cc: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
      Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
      Cc: Jiang Liu <jiang.liu@huawei.com>
      Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
      Cc: Minchan Kim <minchan.kim@gmail.com>
      Cc: Mel Gorman <mgorman@suse.de>
      Cc: David Rientjes <rientjes@google.com>
      Cc: Yinghai Lu <yinghai@kernel.org>
      Cc: Rusty Russell <rusty@rustcorp.com.au>
      Cc: Greg KH <greg@kroah.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      74d42d8f
    • Lai Jiangshan's avatar
      memory_hotplug: handle empty zone when online_movable/online_kernel · e455a9b9
      Lai Jiangshan authored
      Make online_movable/online_kernel can empty a zone or can move memory to a
      empty zone.
      Signed-off-by: default avatarLai Jiangshan <laijs@cn.fujitsu.com>
      Signed-off-by: default avatarWen Congyang <wency@cn.fujitsu.com>
      Cc: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
      Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
      Cc: Jiang Liu <jiang.liu@huawei.com>
      Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
      Cc: Minchan Kim <minchan.kim@gmail.com>
      Cc: Mel Gorman <mgorman@suse.de>
      Cc: David Rientjes <rientjes@google.com>
      Cc: Yinghai Lu <yinghai@kernel.org>
      Cc: Rusty Russell <rusty@rustcorp.com.au>
      Cc: Greg KH <greg@kroah.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      e455a9b9
    • Lai Jiangshan's avatar
      mm, memory-hotplug: dynamic configure movable memory and portion memory · 511c2aba
      Lai Jiangshan authored
      Add online_movable and online_kernel for logic memory hotplug.  This is
      the dynamic version of "movablecore" & "kernelcore".
      
      We have the same reason to introduce it as to introduce "movablecore" &
      "kernelcore".  It has the same motive as "movablecore" & "kernelcore", but
      it is dynamic/running-time:
      
      o We can configure memory as kernelcore or movablecore after boot.
      
        Userspace workload is increased, we need more hugepage, we can't use
        "online_movable" to add memory and allow the system use more
        THP(transparent-huge-page), vice-verse when kernel workload is increase.
      
        Also help for virtualization to dynamic configure host/guest's memory,
        to save/(reduce waste) memory.
      
        Memory capacity on Demand
      
      o When a new node is physically online after boot, we need to use
        "online_movable" or "online_kernel" to configure/portion it as we
        expected when we logic-online it.
      
        This configuration also helps for physically-memory-migrate.
      
      o all benefit as the same as existed "movablecore" & "kernelcore".
      
      o Preparing for movable-node, which is very important for power-saving,
        hardware partitioning and high-available-system(hardware fault
        management).
      
      (Note, we don't introduce movable-node here.)
      
      Action behavior:
      When a memoryblock/memorysection is onlined by "online_movable", the kernel
      will not have directly reference to the page of the memoryblock,
      thus we can remove that memory any time when needed.
      
      When it is online by "online_kernel", the kernel can use it.
      When it is online by "online", the zone type doesn't changed.
      
      Current constraints:
      Only the memoryblock which is adjacent to the ZONE_MOVABLE
      can be online from ZONE_NORMAL to ZONE_MOVABLE.
      
      [akpm@linux-foundation.org: use min_t, cleanups]
      Signed-off-by: default avatarLai Jiangshan <laijs@cn.fujitsu.com>
      Signed-off-by: default avatarWen Congyang <wency@cn.fujitsu.com>
      Cc: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
      Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
      Cc: Jiang Liu <jiang.liu@huawei.com>
      Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
      Cc: Minchan Kim <minchan.kim@gmail.com>
      Cc: Mel Gorman <mgorman@suse.de>
      Cc: David Rientjes <rientjes@google.com>
      Cc: Yinghai Lu <yinghai@kernel.org>
      Cc: Rusty Russell <rusty@rustcorp.com.au>
      Cc: Greg KH <greg@kroah.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      511c2aba
    • Lai Jiangshan's avatar
      drivers/base/node.c: cleanup node_state_attr[] · fcf07d22
      Lai Jiangshan authored
      use [index] = init_value
      use N_xxxxx instead of hardcode.
      
      Make it more readability and easier to add new state.
      Signed-off-by: default avatarLai Jiangshan <laijs@cn.fujitsu.com>
      Signed-off-by: default avatarWen Congyang <wency@cn.fujitsu.com>
      Acked-by: default avatarDavid Rientjes <rientjes@google.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      fcf07d22
    • Joonsoo Kim's avatar
      bootmem: fix wrong call parameter for free_bootmem() · 81df9bff
      Joonsoo Kim authored
      It is strange that alloc_bootmem() returns a virtual address and
      free_bootmem() requires a physical address.  Anyway, free_bootmem()'s
      first parameter should be physical address.
      
      There are some call sites for free_bootmem() with virtual address.  So fix
      them.
      
      [akpm@linux-foundation.org: improve free_bootmem() and free_bootmem_pate() documentation]
      Signed-off-by: default avatarJoonsoo Kim <js1304@gmail.com>
      Cc: Haavard Skinnemoen <hskinnemoen@gmail.com>
      Cc: Hans-Christian Egtvedt <egtvedt@samfundet.no>
      Cc: Johannes Weiner <hannes@cmpxchg.org>
      Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
      Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      81df9bff
    • Joonsoo Kim's avatar
      avr32, kconfig: remove HAVE_ARCH_BOOTMEM · e9b2e78c
      Joonsoo Kim authored
      There is no code for CONFIG_HAVE_ARCH_BOOTMEM, so remove it.
      Signed-off-by: default avatarJoonsoo Kim <js1304@gmail.com>
      Cc: Haavard Skinnemoen <hskinnemoen@gmail.com>
      Cc: Hans-Christian Egtvedt <egtvedt@samfundet.no>
      Cc: Johannes Weiner <hannes@cmpxchg.org>
      Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
      Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      e9b2e78c
    • Marek Szyprowski's avatar
      mm: cma: remove watermark hacks · bc357f43
      Marek Szyprowski authored
      Commits 2139cbe6 ("cma: fix counting of isolated pages") and
      d95ea5d1 ("cma: fix watermark checking") introduced a reliable
      method of free page accounting when memory is being allocated from CMA
      regions, so the workaround introduced earlier by commit 49f223a9
      ("mm: trigger page reclaim in alloc_contig_range() to stabilise
      watermarks") can be finally removed.
      Signed-off-by: default avatarMarek Szyprowski <m.szyprowski@samsung.com>
      Cc: Kyungmin Park <kyungmin.park@samsung.com>
      Cc: Arnd Bergmann <arnd@arndb.de>
      Cc: Mel Gorman <mel@csn.ul.ie>
      Acked-by: default avatarMichal Nazarewicz <mina86@mina86.com>
      Cc: Minchan Kim <minchan@kernel.org>
      Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      bc357f43
    • Marek Szyprowski's avatar
      mm: cma: skip watermarks check for already isolated blocks in split_free_page() · 2e30abd1
      Marek Szyprowski authored
      Since commit 2139cbe6 ("cma: fix counting of isolated pages") free
      pages in isolated pageblocks are not accounted to NR_FREE_PAGES counters,
      so watermarks check is not required if one operates on a free page in
      isolated pageblock.
      Signed-off-by: default avatarMarek Szyprowski <m.szyprowski@samsung.com>
      Cc: Kyungmin Park <kyungmin.park@samsung.com>
      Cc: Arnd Bergmann <arnd@arndb.de>
      Cc: Mel Gorman <mel@csn.ul.ie>
      Acked-by: default avatarMichal Nazarewicz <mina86@mina86.com>
      Cc: Minchan Kim <minchan@kernel.org>
      Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      2e30abd1
    • David Rientjes's avatar
      mm, oom: fix race when specifying a thread as the oom origin · e1e12d2f
      David Rientjes authored
      test_set_oom_score_adj() and compare_swap_oom_score_adj() are used to
      specify that current should be killed first if an oom condition occurs in
      between the two calls.
      
      The usage is
      
      	short oom_score_adj = test_set_oom_score_adj(OOM_SCORE_ADJ_MAX);
      	...
      	compare_swap_oom_score_adj(OOM_SCORE_ADJ_MAX, oom_score_adj);
      
      to store the thread's oom_score_adj, temporarily change it to the maximum
      score possible, and then restore the old value if it is still the same.
      
      This happens to still be racy, however, if the user writes
      OOM_SCORE_ADJ_MAX to /proc/pid/oom_score_adj in between the two calls.
      The compare_swap_oom_score_adj() will then incorrectly reset the old value
      prior to the write of OOM_SCORE_ADJ_MAX.
      
      To fix this, introduce a new oom_flags_t member in struct signal_struct
      that will be used for per-thread oom killer flags.  KSM and swapoff can
      now use a bit in this member to specify that threads should be killed
      first in oom conditions without playing around with oom_score_adj.
      
      This also allows the correct oom_score_adj to always be shown when reading
      /proc/pid/oom_score.
      Signed-off-by: default avatarDavid Rientjes <rientjes@google.com>
      Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
      Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
      Reviewed-by: default avatarMichal Hocko <mhocko@suse.cz>
      Cc: Anton Vorontsov <anton.vorontsov@linaro.org>
      Cc: Oleg Nesterov <oleg@redhat.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      e1e12d2f
    • David Rientjes's avatar
      mm, oom: change type of oom_score_adj to short · a9c58b90
      David Rientjes authored
      The maximum oom_score_adj is 1000 and the minimum oom_score_adj is -1000,
      so this range can be represented by the signed short type with no
      functional change.  The extra space this frees up in struct signal_struct
      will be used for per-thread oom kill flags in the next patch.
      Signed-off-by: default avatarDavid Rientjes <rientjes@google.com>
      Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
      Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
      Reviewed-by: default avatarMichal Hocko <mhocko@suse.cz>
      Cc: Anton Vorontsov <anton.vorontsov@linaro.org>
      Cc: Oleg Nesterov <oleg@redhat.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      a9c58b90
    • Yasuaki Ishimatsu's avatar
      mm: cleanup register_node() · fa264375
      Yasuaki Ishimatsu authored
      register_node() is defined as extern in include/linux/node.h.  But the
      function is only called from register_one_node() in driver/base/node.c.
      
      So the patch defines register_node() as static.
      Signed-off-by: default avatarYasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
      Acked-by: default avatarDavid Rientjes <rientjes@google.com>
      Acked-by: default avatarKOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      fa264375
    • David Rientjes's avatar
      mm, mempolicy: remove duplicate code · 212a0a6f
      David Rientjes authored
      Remove some duplicate code and simplify alloc_pages_vma().  No functional
      change.
      Signed-off-by: default avatarDavid Rientjes <rientjes@google.com>
      Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      212a0a6f
    • Jeff Liu's avatar
      mm/vmscan.c: try_to_freeze() returns boolean · 6f6313d4
      Jeff Liu authored
      kswapd()->try_to_freeze() is defined to return a boolean, so it's better
      to use a bool to hold its return value.
      Signed-off-by: default avatarJie Liu <jeff.liu@oracle.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      6f6313d4
    • Rafael Aquini's avatar
      mm: introduce putback_movable_pages() · 5733c7d1
      Rafael Aquini authored
      The PATCH "mm: introduce compaction and migration for virtio ballooned pages"
      hacks around putback_lru_pages() in order to allow ballooned pages to be
      re-inserted on balloon page list as if a ballooned page was like a LRU page.
      
      As ballooned pages are not legitimate LRU pages, this patch introduces
      putback_movable_pages() to properly cope with cases where the isolated
      pageset contains ballooned pages and LRU pages, thus fixing the mentioned
      inelegant hack around putback_lru_pages().
      Signed-off-by: default avatarRafael Aquini <aquini@redhat.com>
      Cc: Rusty Russell <rusty@rustcorp.com.au>
      Cc: "Michael S. Tsirkin" <mst@redhat.com>
      Cc: Rik van Riel <riel@redhat.com>
      Cc: Mel Gorman <mel@csn.ul.ie>
      Cc: Andi Kleen <andi@firstfloor.org>
      Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
      Cc: Minchan Kim <minchan@kernel.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      5733c7d1
    • Rafael Aquini's avatar
      virtio_balloon: introduce migration primitives to balloon pages · e2250429
      Rafael Aquini authored
      Memory fragmentation introduced by ballooning might reduce significantly
      the number of 2MB contiguous memory blocks that can be used within a guest,
      thus imposing performance penalties associated with the reduced number of
      transparent huge pages that could be used by the guest workload.
      
      Besides making balloon pages movable at allocation time and introducing
      the necessary primitives to perform balloon page migration/compaction,
      this patch also introduces the following locking scheme, in order to
      enhance the syncronization methods for accessing elements of struct
      virtio_balloon, thus providing protection against concurrent access
      introduced by parallel memory migration threads.
      
       - balloon_lock (mutex) : synchronizes the access demand to elements of
                                struct virtio_balloon and its queue operations;
      
      [yongjun_wei@trendmicro.com.cn: fix missing unlock on error in fill_balloon()]
      [akpm@linux-foundation.org: avoid having multiple return points in fill_balloon()]
      [akpm@linux-foundation.org: fix printk warning]Signed-off-by: Rafael Aquini <aquini@redhat.com>
      Acked-by: default avatarMichael S. Tsirkin <mst@redhat.com>
      Cc: Rusty Russell <rusty@rustcorp.com.au>
      Cc: Rik van Riel <riel@redhat.com>
      Cc: Mel Gorman <mel@csn.ul.ie>
      Cc: Andi Kleen <andi@firstfloor.org>
      Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
      Cc: Minchan Kim <minchan@kernel.org>
      Signed-off-by: default avatarWei Yongjun <yongjun_wei@trendmicro.com.cn>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      e2250429
    • Rafael Aquini's avatar
      mm: introduce compaction and migration for ballooned pages · bf6bddf1
      Rafael Aquini authored
      Memory fragmentation introduced by ballooning might reduce significantly
      the number of 2MB contiguous memory blocks that can be used within a guest,
      thus imposing performance penalties associated with the reduced number of
      transparent huge pages that could be used by the guest workload.
      
      This patch introduces the helper functions as well as the necessary changes
      to teach compaction and migration bits how to cope with pages which are
      part of a guest memory balloon, in order to make them movable by memory
      compaction procedures.
      Signed-off-by: default avatarRafael Aquini <aquini@redhat.com>
      Acked-by: default avatarMel Gorman <mel@csn.ul.ie>
      Cc: Rusty Russell <rusty@rustcorp.com.au>
      Cc: "Michael S. Tsirkin" <mst@redhat.com>
      Cc: Rik van Riel <riel@redhat.com>
      Cc: Andi Kleen <andi@firstfloor.org>
      Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
      Cc: Minchan Kim <minchan@kernel.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      bf6bddf1
    • Rafael Aquini's avatar
      mm: introduce a common interface for balloon pages mobility · 18468d93
      Rafael Aquini authored
      Memory fragmentation introduced by ballooning might reduce significantly
      the number of 2MB contiguous memory blocks that can be used within a guest,
      thus imposing performance penalties associated with the reduced number of
      transparent huge pages that could be used by the guest workload.
      
      This patch introduces a common interface to help a balloon driver on
      making its page set movable to compaction, and thus allowing the system
      to better leverage the compation efforts on memory defragmentation.
      
      [akpm@linux-foundation.org: use PAGE_FLAGS_CHECK_AT_PREP, s/__balloon_page_flags/page_flags_cleared/, small cleanups]
      [rientjes@google.com: allow balloon compaction for any system with memory compaction enabled, which is the defconfig]
      Signed-off-by: default avatarRafael Aquini <aquini@redhat.com>
      Acked-by: default avatarMel Gorman <mel@csn.ul.ie>
      Cc: Rusty Russell <rusty@rustcorp.com.au>
      Cc: "Michael S. Tsirkin" <mst@redhat.com>
      Cc: Rik van Riel <riel@redhat.com>
      Cc: Andi Kleen <andi@firstfloor.org>
      Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
      Cc: Minchan Kim <minchan@kernel.org>
      Signed-off-by: default avatarDavid Rientjes <rientjes@google.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      18468d93
    • Rafael Aquini's avatar
      mm: redefine address_space.assoc_mapping · 252aa6f5
      Rafael Aquini authored
      Overhaul struct address_space.assoc_mapping renaming it to
      address_space.private_data and its type is redefined to void*.  By this
      approach we consistently name the .private_* elements from struct
      address_space as well as allow extended usage for address_space
      association with other data structures through ->private_data.
      
      Also, all users of old ->assoc_mapping element are converted to reflect
      its new name and type change (->private_data).
      Signed-off-by: default avatarRafael Aquini <aquini@redhat.com>
      Cc: Rusty Russell <rusty@rustcorp.com.au>
      Cc: "Michael S. Tsirkin" <mst@redhat.com>
      Cc: Rik van Riel <riel@redhat.com>
      Cc: Mel Gorman <mel@csn.ul.ie>
      Cc: Andi Kleen <andi@firstfloor.org>
      Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
      Cc: Minchan Kim <minchan@kernel.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      252aa6f5
    • Rafael Aquini's avatar
      mm: adjust address_space_operations.migratepage() return code · 78bd5209
      Rafael Aquini authored
      Memory fragmentation introduced by ballooning might reduce significantly
      the number of 2MB contiguous memory blocks that can be used within a
      guest, thus imposing performance penalties associated with the reduced
      number of transparent huge pages that could be used by the guest workload.
      
      This patch-set follows the main idea discussed at 2012 LSFMMS session:
      "Ballooning for transparent huge pages" -- http://lwn.net/Articles/490114/
      to introduce the required changes to the virtio_balloon driver, as well as
      the changes to the core compaction & migration bits, in order to make
      those subsystems aware of ballooned pages and allow memory balloon pages
      become movable within a guest, thus avoiding the aforementioned
      fragmentation issue
      
      Following are numbers that prove this patch benefits on allowing
      compaction to be more effective at memory ballooned guests.
      
      Results for STRESS-HIGHALLOC benchmark, from Mel Gorman's mmtests suite,
      running on a 4gB RAM KVM guest which was ballooning 512mB RAM in 64mB
      chunks, at every minute (inflating/deflating), while test was running:
      
      ===BEGIN stress-highalloc
      
      STRESS-HIGHALLOC
                       highalloc-3.7     highalloc-3.7
                           rc4-clean         rc4-patch
      Pass 1          55.00 ( 0.00%)    62.00 ( 7.00%)
      Pass 2          54.00 ( 0.00%)    62.00 ( 8.00%)
      while Rested    75.00 ( 0.00%)    80.00 ( 5.00%)
      
      MMTests Statistics: duration
                       3.7         3.7
                 rc4-clean   rc4-patch
      User         1207.59     1207.46
      System       1300.55     1299.61
      Elapsed      2273.72     2157.06
      
      MMTests Statistics: vmstat
                                      3.7         3.7
                                rc4-clean   rc4-patch
      Page Ins                    3581516     2374368
      Page Outs                  11148692    10410332
      Swap Ins                         80          47
      Swap Outs                      3641         476
      Direct pages scanned          37978       33826
      Kswapd pages scanned        1828245     1342869
      Kswapd pages reclaimed      1710236     1304099
      Direct pages reclaimed        32207       31005
      Kswapd efficiency               93%         97%
      Kswapd velocity             804.077     622.546
      Direct efficiency               84%         91%
      Direct velocity              16.703      15.682
      Percentage direct scans          2%          2%
      Page writes by reclaim        79252        9704
      Page writes file              75611        9228
      Page writes anon               3641         476
      Page reclaim immediate        16764       11014
      Page rescued immediate            0           0
      Slabs scanned               2171904     2152448
      Direct inode steals             385        2261
      Kswapd inode steals          659137      609670
      Kswapd skipped wait               1          69
      THP fault alloc                 546         631
      THP collapse alloc              361         339
      THP splits                      259         263
      THP fault fallback               98          50
      THP collapse fail                20          17
      Compaction stalls               747         499
      Compaction success              244         145
      Compaction failures             503         354
      Compaction pages moved       370888      474837
      Compaction move failure       77378       65259
      
      ===END stress-highalloc
      
      This patch:
      
      Introduce MIGRATEPAGE_SUCCESS as the default return code for
      address_space_operations.migratepage() method and documents the expected
      return code for the same method in failure cases.
      Signed-off-by: default avatarRafael Aquini <aquini@redhat.com>
      Cc: Rusty Russell <rusty@rustcorp.com.au>
      Cc: "Michael S. Tsirkin" <mst@redhat.com>
      Cc: Rik van Riel <riel@redhat.com>
      Cc: Mel Gorman <mel@csn.ul.ie>
      Cc: Andi Kleen <andi@firstfloor.org>
      Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
      Cc: Minchan Kim <minchan@kernel.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      78bd5209
    • Andrew Morton's avatar
      arch/sparc/kernel/sys_sparc_64.c: s/COLOUR/COLOR/ · 748ba883
      Andrew Morton authored
      Consistently spell this word across arch/sparc/mm and arch/sparc/kernel.
      Acked-by: default avatarDavid Miller <davem@davemloft.net>
      Cc: Michel Lespinasse <walken@google.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      748ba883
    • Michel Lespinasse's avatar
      mm: use vm_unmapped_area() in hugetlbfs on sparc64 architecture · 2aea28b9
      Michel Lespinasse authored
      Update the sparc64 hugetlb_get_unmapped_area function to make use of
      vm_unmapped_area() instead of implementing a brute force search.
      Signed-off-by: default avatarMichel Lespinasse <walken@google.com>
      Reviewed-by: default avatarRik van Riel <riel@redhat.com>
      Cc: Hugh Dickins <hughd@google.com>
      Cc: Russell King <linux@arm.linux.org.uk>
      Cc: Ralf Baechle <ralf@linux-mips.org>
      Cc: Paul Mundt <lethal@linux-sh.org>
      Cc: "David S. Miller" <davem@davemloft.net>
      Cc: Chris Metcalf <cmetcalf@tilera.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: "H. Peter Anvin" <hpa@zytor.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      2aea28b9
    • Michel Lespinasse's avatar
      mm: use vm_unmapped_area() on sparc64 architecture · bb64f550
      Michel Lespinasse authored
      Update the sparc64 arch_get_unmapped_area[_topdown] functions to make use
      of vm_unmapped_area() instead of implementing a brute force search.
      
      [akpm@linux-foundation.org: remove now-unused COLOUR_ALIGN_DOWN()]
      Signed-off-by: default avatarMichel Lespinasse <walken@google.com>
      Reviewed-by: default avatarRik van Riel <riel@redhat.com>
      Cc: Hugh Dickins <hughd@google.com>
      Cc: Russell King <linux@arm.linux.org.uk>
      Cc: Ralf Baechle <ralf@linux-mips.org>
      Cc: Paul Mundt <lethal@linux-sh.org>
      Cc: "David S. Miller" <davem@davemloft.net>
      Cc: Chris Metcalf <cmetcalf@tilera.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: "H. Peter Anvin" <hpa@zytor.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      bb64f550
    • Michel Lespinasse's avatar
      mm: use vm_unmapped_area() in hugetlbfs on tile architecture · dd529596
      Michel Lespinasse authored
      Update the tile hugetlb_get_unmapped_area function to make use of
      vm_unmapped_area() instead of implementing a brute force search.
      
      [akpm@linux-foundation.org: fix build]
      Signed-off-by: default avatarMichel Lespinasse <walken@google.com>
      Reviewed-by: default avatarRik van Riel <riel@redhat.com>
      Cc: Hugh Dickins <hughd@google.com>
      Cc: Russell King <linux@arm.linux.org.uk>
      Cc: Ralf Baechle <ralf@linux-mips.org>
      Cc: Paul Mundt <lethal@linux-sh.org>
      Cc: "David S. Miller" <davem@davemloft.net>
      Cc: Chris Metcalf <cmetcalf@tilera.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: "H. Peter Anvin" <hpa@zytor.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      dd529596
    • Michel Lespinasse's avatar
      mm: use vm_unmapped_area() on sparc32 architecture · a046be3d
      Michel Lespinasse authored
      Update the sparc32 arch_get_unmapped_area function to make use of
      vm_unmapped_area() instead of implementing a brute force search.
      
      [akpm@linux-foundation.org: fix build]
      [akpm@linux-foundation.org: remove now-unused COLOUR_ALIGN()]
      Signed-off-by: default avatarMichel Lespinasse <walken@google.com>
      Reviewed-by: default avatarRik van Riel <riel@redhat.com>
      Cc: Hugh Dickins <hughd@google.com>
      Cc: Russell King <linux@arm.linux.org.uk>
      Cc: Ralf Baechle <ralf@linux-mips.org>
      Cc: Paul Mundt <lethal@linux-sh.org>
      Acked-by: default avatar"David S. Miller" <davem@davemloft.net>
      Cc: Chris Metcalf <cmetcalf@tilera.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: "H. Peter Anvin" <hpa@zytor.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      a046be3d
    • Michel Lespinasse's avatar
      mm: use vm_unmapped_area() on sh architecture · b4265f12
      Michel Lespinasse authored
      Update the sh arch_get_unmapped_area[_topdown] functions to make use of
      vm_unmapped_area() instead of implementing a brute force search.
      
      [akpm@linux-foundation.org: remove now-unused COLOUR_ALIGN_DOWN()]
      Signed-off-by: default avatarMichel Lespinasse <walken@google.com>
      Reviewed-by: default avatarRik van Riel <riel@redhat.com>
      Cc: Hugh Dickins <hughd@google.com>
      Cc: Russell King <linux@arm.linux.org.uk>
      Cc: Ralf Baechle <ralf@linux-mips.org>
      Cc: Paul Mundt <lethal@linux-sh.org>
      Cc: "David S. Miller" <davem@davemloft.net>
      Cc: Chris Metcalf <cmetcalf@tilera.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: "H. Peter Anvin" <hpa@zytor.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      b4265f12
    • Michel Lespinasse's avatar
      mm: use vm_unmapped_area() on arm architecture · 394ef640
      Michel Lespinasse authored
      Update the arm arch_get_unmapped_area[_topdown] functions to make use of
      vm_unmapped_area() instead of implementing a brute force search.
      
      [akpm@linux-foundation.org: remove now-unused COLOUR_ALIGN_DOWN()]
      Signed-off-by: default avatarMichel Lespinasse <walken@google.com>
      Reviewed-by: default avatarRik van Riel <riel@redhat.com>
      Cc: Hugh Dickins <hughd@google.com>
      Cc: Russell King <linux@arm.linux.org.uk>
      Cc: Ralf Baechle <ralf@linux-mips.org>
      Cc: Paul Mundt <lethal@linux-sh.org>
      Cc: "David S. Miller" <davem@davemloft.net>
      Cc: Chris Metcalf <cmetcalf@tilera.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: "H. Peter Anvin" <hpa@zytor.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      394ef640
    • Michel Lespinasse's avatar
      mm: use vm_unmapped_area() on mips architecture · b6661861
      Michel Lespinasse authored
      Update the mips arch_get_unmapped_area[_topdown] functions to make use of
      vm_unmapped_area() instead of implementing a brute force search.
      
      [akpm@linux-foundation.org: remove now-unused COLOUR_ALIGN_DOWN()]
      Signed-off-by: default avatarMichel Lespinasse <walken@google.com>
      Reviewed-by: default avatarRik van Riel <riel@redhat.com>
      Cc: Hugh Dickins <hughd@google.com>
      Cc: Russell King <linux@arm.linux.org.uk>
      Cc: Ralf Baechle <ralf@linux-mips.org>
      Cc: Paul Mundt <lethal@linux-sh.org>
      Cc: "David S. Miller" <davem@davemloft.net>
      Cc: Chris Metcalf <cmetcalf@tilera.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: "H. Peter Anvin" <hpa@zytor.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      b6661861
    • Michel Lespinasse's avatar
      mm: use vm_unmapped_area() in hugetlbfs on i386 architecture · cdc17344
      Michel Lespinasse authored
      Update the i386 hugetlb_get_unmapped_area function to make use of
      vm_unmapped_area() instead of implementing a brute force search.
      
      [akpm@linux-foundation.org: fix build]
      Signed-off-by: default avatarMichel Lespinasse <walken@google.com>
      Reviewed-by: default avatarRik van Riel <riel@redhat.com>
      Cc: Hugh Dickins <hughd@google.com>
      Cc: Russell King <linux@arm.linux.org.uk>
      Cc: Ralf Baechle <ralf@linux-mips.org>
      Cc: Paul Mundt <lethal@linux-sh.org>
      Cc: "David S. Miller" <davem@davemloft.net>
      Cc: Chris Metcalf <cmetcalf@tilera.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: "H. Peter Anvin" <hpa@zytor.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      cdc17344
    • Michel Lespinasse's avatar
      mm: use vm_unmapped_area() in hugetlbfs · 08659355
      Michel Lespinasse authored
      Update the hugetlb_get_unmapped_area function to make use of
      vm_unmapped_area() instead of implementing a brute force search.
      Signed-off-by: default avatarMichel Lespinasse <walken@google.com>
      Reviewed-by: default avatarRik van Riel <riel@redhat.com>
      Cc: Hugh Dickins <hughd@google.com>
      Cc: Russell King <linux@arm.linux.org.uk>
      Cc: Ralf Baechle <ralf@linux-mips.org>
      Cc: Paul Mundt <lethal@linux-sh.org>
      Cc: "David S. Miller" <davem@davemloft.net>
      Cc: Chris Metcalf <cmetcalf@tilera.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: "H. Peter Anvin" <hpa@zytor.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      08659355
    • Michel Lespinasse's avatar
      mm: fix cache coloring on x86_64 architecture · 7d025059
      Michel Lespinasse authored
      Fix the x86-64 cache alignment code to take pgoff into account.  Use the
      x86 and MIPS cache alignment code as the basis for a generic cache
      alignment function.
      
      The old x86 code will always align the mmap to aliasing boundaries,
      even if the program mmaps the file with a non-zero pgoff.
      
      If program A mmaps the file with pgoff 0, and program B mmaps the file
      with pgoff 1.  The old code would align the mmaps, resulting in misaligned
      pages:
      
        A:  0123
        B:  123
      
      After this patch, they are aligned so the pages line up:
      
        A: 0123
        B:  123
      
      Proposed by Rik van Riel.
      Signed-off-by: default avatarMichel Lespinasse <walken@google.com>
      Cc: Rik van Riel <riel@redhat.com>
      Cc: Hugh Dickins <hughd@google.com>
      Cc: Russell King <linux@arm.linux.org.uk>
      Cc: Ralf Baechle <ralf@linux-mips.org>
      Cc: Paul Mundt <lethal@linux-sh.org>
      Cc: "David S. Miller" <davem@davemloft.net>
      Cc: Chris Metcalf <cmetcalf@tilera.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: "H. Peter Anvin" <hpa@zytor.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      7d025059
    • Michel Lespinasse's avatar
      mm: use vm_unmapped_area() on x86_64 architecture · f9902472
      Michel Lespinasse authored
      Update the x86_64 arch_get_unmapped_area[_topdown] functions to make use
      of vm_unmapped_area() instead of implementing a brute force search.
      Signed-off-by: default avatarMichel Lespinasse <walken@google.com>
      Reviewed-by: default avatarRik van Riel <riel@redhat.com>
      Cc: Hugh Dickins <hughd@google.com>
      Cc: Russell King <linux@arm.linux.org.uk>
      Cc: Ralf Baechle <ralf@linux-mips.org>
      Cc: Paul Mundt <lethal@linux-sh.org>
      Cc: "David S. Miller" <davem@davemloft.net>
      Cc: Chris Metcalf <cmetcalf@tilera.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: "H. Peter Anvin" <hpa@zytor.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      f9902472
    • Michel Lespinasse's avatar
      mm: vm_unmapped_area() lookup function · db4fbfb9
      Michel Lespinasse authored
      Implement vm_unmapped_area() using the rb_subtree_gap and highest_vm_end
      information to look up for suitable virtual address space gaps.
      
      struct vm_unmapped_area_info is used to define the desired allocation
      request:
       - lowest or highest possible address matching the remaining constraints
       - desired gap length
       - low/high address limits that the gap must fit into
       - alignment mask and offset
      
      Also update the generic arch_get_unmapped_area[_topdown] functions to make
      use of vm_unmapped_area() instead of implementing a brute force search.
      
      [akpm@linux-foundation.org: checkpatch fixes]
      Signed-off-by: default avatarMichel Lespinasse <walken@google.com>
      Reviewed-by: default avatarRik van Riel <riel@redhat.com>
      Cc: Hugh Dickins <hughd@google.com>
      Cc: Russell King <linux@arm.linux.org.uk>
      Cc: Ralf Baechle <ralf@linux-mips.org>
      Cc: Paul Mundt <lethal@linux-sh.org>
      Cc: "David S. Miller" <davem@davemloft.net>
      Cc: Chris Metcalf <cmetcalf@tilera.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: "H. Peter Anvin" <hpa@zytor.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      db4fbfb9
    • Rik van Riel's avatar
      mm: rearrange vm_area_struct for fewer cache misses · e4c6bfd2
      Rik van Riel authored
      The kernel walks the VMA rbtree in various places, including the page
      fault path.  However, the vm_rb node spanned two cache lines, on 64 bit
      systems with 64 byte cache lines (most x86 systems).
      
      Rearrange vm_area_struct a little, so all the information we need to do a
      VMA tree walk is in the first cache line.
      
      [akpm@linux-foundation.org: checkpatch fixes]
      Signed-off-by: default avatarMichel Lespinasse <walken@google.com>
      Signed-off-by: default avatarRik van Riel <riel@redhat.com>
      Cc: Hugh Dickins <hughd@google.com>
      Cc: Russell King <linux@arm.linux.org.uk>
      Cc: Ralf Baechle <ralf@linux-mips.org>
      Cc: Paul Mundt <lethal@linux-sh.org>
      Cc: "David S. Miller" <davem@davemloft.net>
      Cc: Chris Metcalf <cmetcalf@tilera.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: "H. Peter Anvin" <hpa@zytor.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      e4c6bfd2
    • Michel Lespinasse's avatar
      mm: check rb_subtree_gap correctness · 5a0768f6
      Michel Lespinasse authored
      When CONFIG_DEBUG_VM_RB is enabled, check that rb_subtree_gap is correctly
      set for every vma and that mm->highest_vm_end is also correct.
      
      Also add an explicit 'bug' variable to track if browse_rb() detected any
      invalid condition.
      
      [akpm@linux-foundation.org: repair innovative coding-style inventions]
      Signed-off-by: default avatarMichel Lespinasse <walken@google.com>
      Reviewed-by: default avatarRik van Riel <riel@redhat.com>
      Cc: Hugh Dickins <hughd@google.com>
      Cc: Russell King <linux@arm.linux.org.uk>
      Cc: Ralf Baechle <ralf@linux-mips.org>
      Cc: Paul Mundt <lethal@linux-sh.org>
      Cc: "David S. Miller" <davem@davemloft.net>
      Cc: Chris Metcalf <cmetcalf@tilera.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: "H. Peter Anvin" <hpa@zytor.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      5a0768f6
    • Michel Lespinasse's avatar
      mm: augment vma rbtree with rb_subtree_gap · d3737187
      Michel Lespinasse authored
      Define vma->rb_subtree_gap as the largest gap between any vma in the
      subtree rooted at that vma, and their predecessor.  Or, for a recursive
      definition, vma->rb_subtree_gap is the max of:
      
       - vma->vm_start - vma->vm_prev->vm_end
       - rb_subtree_gap fields of the vmas pointed by vma->rb.rb_left and
         vma->rb.rb_right
      
      This will allow get_unmapped_area_* to find a free area of the right
      size in O(log(N)) time, instead of potentially having to do a linear
      walk across all the VMAs.
      
      Also define mm->highest_vm_end as the vm_end field of the highest vma,
      so that we can easily check if the following gap is suitable.
      
      This does have the potential to make unmapping VMAs more expensive,
      especially for processes with very large numbers of VMAs, where the VMA
      rbtree can grow quite deep.
      Signed-off-by: default avatarMichel Lespinasse <walken@google.com>
      Reviewed-by: default avatarRik van Riel <riel@redhat.com>
      Cc: Hugh Dickins <hughd@google.com>
      Cc: Russell King <linux@arm.linux.org.uk>
      Cc: Ralf Baechle <ralf@linux-mips.org>
      Cc: Paul Mundt <lethal@linux-sh.org>
      Cc: "David S. Miller" <davem@davemloft.net>
      Cc: Chris Metcalf <cmetcalf@tilera.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: "H. Peter Anvin" <hpa@zytor.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      d3737187
    • Andi Kleen's avatar
      selftests: add a test program for variable huge page sizes in mmap/shmget · fcc1f2d5
      Andi Kleen authored
      Also remove -Wextra because gcc-4.6 emits lots of irritating
      signed/unsigned comparison warnings.
      Signed-off-by: default avatarAndi Kleen <ak@linux.intel.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      fcc1f2d5
    • Andi Kleen's avatar
      mm: support more pagesizes for MAP_HUGETLB/SHM_HUGETLB · 42d7395f
      Andi Kleen authored
      There was some desire in large applications using MAP_HUGETLB or
      SHM_HUGETLB to use 1GB huge pages on some mappings, and stay with 2MB on
      others.  This is useful together with NUMA policy: use 2MB interleaving
      on some mappings, but 1GB on local mappings.
      
      This patch extends the IPC/SHM syscall interfaces slightly to allow
      specifying the page size.
      
      It borrows some upper bits in the existing flag arguments and allows
      encoding the log of the desired page size in addition to the *_HUGETLB
      flag.  When 0 is specified the default size is used, this makes the
      change fully compatible.
      
      Extending the internal hugetlb code to handle this is straight forward.
      Instead of a single mount it just keeps an array of them and selects the
      right mount based on the specified page size.  When no page size is
      specified it uses the mount of the default page size.
      
      The change is not visible in /proc/mounts because internal mounts don't
      appear there.  It also has very little overhead: the additional mounts
      just consume a super block, but not more memory when not used.
      
      I also exported the new flags to the user headers (they were previously
      under __KERNEL__).  Right now only symbols for x86 and some other
      architecture for 1GB and 2MB are defined.  The interface should already
      work for all other architectures though.  Only architectures that define
      multiple hugetlb sizes actually need it (that is currently x86, tile,
      powerpc).  However tile and powerpc have user configurable hugetlb
      sizes, so it's not easy to add defines.  A program on those
      architectures would need to query sysfs and use the appropiate log2.
      
      [akpm@linux-foundation.org: cleanups]
      [rientjes@google.com: fix build]
      [akpm@linux-foundation.org: checkpatch fixes]
      Signed-off-by: default avatarAndi Kleen <ak@linux.intel.com>
      Cc: Michael Kerrisk <mtk.manpages@gmail.com>
      Acked-by: default avatarRik van Riel <riel@redhat.com>
      Acked-by: default avatarKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
      Cc: Hillf Danton <dhillf@gmail.com>
      Signed-off-by: default avatarDavid Rientjes <rientjes@google.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      42d7395f