- 02 Aug, 2016 40 commits
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Sergey Senozhatsky authored
Messages' levels and console log level are inspected when the actual printing occurs, which may provoke console_unlock() and console_cont_flush() to waste CPU cycles on every message that has loglevel above the current console_loglevel. Schematically, console_unlock() does the following: console_unlock() { ... for (;;) { ... raw_spin_lock_irqsave(&logbuf_lock, flags); skip: msg = log_from_idx(console_idx); if (msg->flags & LOG_NOCONS) { ... goto skip; } level = msg->level; len += msg_print_text(); >> sprintfs memcpy, etc. if (nr_ext_console_drivers) { ext_len = msg_print_ext_header(); >> scnprintf ext_len += msg_print_ext_body(); >> scnprintfs etc. } ... raw_spin_unlock(&logbuf_lock); call_console_drivers(level, ext_text, ext_len, text, len) { if (level >= console_loglevel && >> drop the message !ignore_loglevel) return; console->write(...); } local_irq_restore(flags); } ... } The thing here is this deferred `level >= console_loglevel' check. We are wasting CPU cycles on sprintfs/memcpy/etc. preparing the messages that we will eventually drop. This can be huge when we register a new CON_PRINTBUFFER console, for instance. For every such a console register_console() resets the console_seq, console_idx, console_prev and sets a `exclusive console' pointer to replay the log buffer to that just-registered console. And there can be a lot of messages to replay, in the worst case most of which can be dropped after console_loglevel test. We know messages' levels long before we call msg_print_text() and friends, so we can just move console_loglevel check out of call_console_drivers() and format a new message only if we are sure that it won't be dropped. The patch factors out loglevel check into suppress_message_printing() function and tests message->level and console_loglevel before formatting functions in console_unlock() and console_cont_flush() are getting executed. This improves things not only for exclusive CON_PRINTBUFFER consoles, but for every console_unlock() that attempts to print a message of level above the console_loglevel. Link: http://lkml.kernel.org/r/20160627135012.8229-1-sergey.senozhatsky@gmail.comSigned-off-by:Sergey Senozhatsky <sergey.senozhatsky@gmail.com> Reviewed-by:
Petr Mladek <pmladek@suse.com> Cc: Tejun Heo <tj@kernel.org> Cc: Jan Kara <jack@suse.cz> Cc: Calvin Owens <calvinowens@fb.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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Joe Perches authored
Using functions instead of macros can reduce overall code size by eliminating unnecessary "KERN_SOH<digit>" prefixes from format strings. defconfig x86-64: $ size vmlinux* text data bss dec hex filename 10193570 4331464 1105920 15630954 ee826a vmlinux.new 10192623 4335560 1105920 15634103 ee8eb7 vmlinux.old As the return value are unimportant and unused in the kernel tree, these new functions return void. Miscellanea: - change pr_<level> macros to call new __pr_<level> functions - change vprintk_nmi and vprintk_default to add LOGLEVEL_<level> argument [akpm@linux-foundation.org: fix LOGLEVEL_INFO, per Joe] Link: http://lkml.kernel.org/r/e16cc34479dfefcae37c98b481e6646f0f69efc3.1466718827.git.joe@perches.comSigned-off-by:Joe Perches <joe@perches.com> Signed-off-by:
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Sergey Senozhatsky authored
A trivial cosmetic change: interrupt.h header is redundant since commit 6b898c07 ("console: use might_sleep in console_lock"). Link: http://lkml.kernel.org/r/20160620132847.21930-1-sergey.senozhatsky@gmail.comSigned-off-by:
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Luis de Bethencourt authored
kernel.h header doesn't directly use dynamic debug, instead we can include it in module.c (which used it via kernel.h). printk.h only uses it if CONFIG_DYNAMIC_DEBUG is on, changing the inclusion to only happen in that case. Link: http://lkml.kernel.org/r/1468429793-16917-1-git-send-email-luisbg@osg.samsung.com [luisbg@osg.samsung.com: include dynamic_debug.h in drb_int.h] Link: http://lkml.kernel.org/r/1468447828-18558-2-git-send-email-luisbg@osg.samsung.comSigned-off-by:
Luis de Bethencourt <luisbg@osg.samsung.com> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: Hidehiro Kawai <hidehiro.kawai.ez@hitachi.com> Cc: Borislav Petkov <bp@suse.de> Cc: Michal Nazarewicz <mina86@mina86.com> Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk> Cc: Joe Perches <joe@perches.com> Signed-off-by:
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Oleg Nesterov authored
Change task_work_cancel() to use lockless_dereference(), this is what the code really wants but we didn't have this helper when it was written. Also add the fast-path task->task_works == NULL check, in the likely case this task has no pending works and we can avoid spin_lock(task->pi_lock). While at it, change other users of ACCESS_ONCE() to use READ_ONCE(). Link: http://lkml.kernel.org/r/20160610150042.GA13868@redhat.comSigned-off-by:
Oleg Nesterov <oleg@redhat.com> Cc: Andrea Parri <parri.andrea@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Signed-off-by:
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Chen Gang authored
For pure bool function's return value, bool is a little better more or less than int. Link: http://lkml.kernel.org/r/1469331815-2026-1-git-send-email-chengang@emindsoft.com.cnSigned-off-by:
Chen Gang <gang.chen.5i5j@gmail.com> Acked-by:
Michael Ellerman <mpe@ellerman.id.au> Signed-off-by:
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Linus Lüssing authored
For one thing, summarizes all non-umlaut versions into the umlaut one (Linus Luessing -> Linus Lüssing). For another, maps obsolete email addresses to the current @c0d3.blue one. Link: http://lkml.kernel.org/r/1467805371-2773-1-git-send-email-linus.luessing@c0d3.blueSigned-off-by:
Linus Lüssing <linus.luessing@c0d3.blue> Signed-off-by:
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Alexey Dobriyan authored
Don't user forward declarations of internal kernel structures in headers exported to userspace. Move "struct completion;". Move "struct task_struct;". Link: http://lkml.kernel.org/r/20160713215808.GA22486@p183.telecom.bySigned-off-by:
Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by:
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Fabian Frederick authored
There was only one use of __initdata_refok and __exit_refok __init_refok was used 46 times against 82 for __ref. Those definitions are obsolete since commit 312b1485 ("Introduce new section reference annotations tags: __ref, __refdata, __refconst") This patch removes the following compatibility definitions and replaces them treewide. /* compatibility defines */ #define __init_refok __ref #define __initdata_refok __refdata #define __exit_refok __ref I can also provide separate patches if necessary. (One patch per tree and check in 1 month or 2 to remove old definitions) [akpm@linux-foundation.org: coding-style fixes] Link: http://lkml.kernel.org/r/1466796271-3043-1-git-send-email-fabf@skynet.beSigned-off-by:
Fabian Frederick <fabf@skynet.be> Cc: Ingo Molnar <mingo@redhat.com> Cc: Sam Ravnborg <sam@ravnborg.org> Signed-off-by:
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NeilBrown authored
When alloc_disk(0) is used the ->major number is completely ignored. All devices are allocated with a major of BLOCK_EXT_MAJOR. So remove registration and deregistration of 'major'. Link: http://lkml.kernel.org/r/20160602064318.4403.49955.stgit@nobleSigned-off-by:
NeilBrown <neilb@suse.com> Cc: Keith Busch <keith.busch@intel.com> Cc: Jens Axboe <axboe@fb.com> Cc: Maxim Levitsky <maximlevitsky@gmail.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by:
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Richard Weinberger authored
UML is a bit special since it does not have iomem nor dma. That means a lot of drivers will not build if they miss a dependency on HAS_IOMEM. s390 used to have the same issues but since it gained PCI support UML is the only stranger. We are tired of patching dozens of new drivers after every merge window just to un-break allmod/yesconfig UML builds. One could argue that a decent driver has to know on what it depends and therefore a missing HAS_IOMEM dependency is a clear driver bug. But the dependency not obvious and not everyone does UML builds with COMPILE_TEST enabled when developing a device driver. A possible solution to make these builds succeed on UML would be providing stub functions for ioremap() and friends which fail upon runtime. Another one is simply disabling COMPILE_TEST for UML. Since it is the least hassle and does not force use to fake iomem support let's do the latter. Link: http://lkml.kernel.org/r/1466152995-28367-1-git-send-email-richard@nod.atSigned-off-by:
Richard Weinberger <richard@nod.at> Acked-by:
Arnd Bergmann <arnd@arndb.de> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by:
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Valdis Kletnieks authored
Suppress a bunch of warnings of the form: fs/proc/task_mmu.c: In function 'show_smap_vma_flags': fs/proc/task_mmu.c:635:22: warning: initialized field overwritten [-Wt override-init] [ilog2(VM_READ)] = "rd", ^~~~ fs/proc/task_mmu.c:635:22: note: (near initialization for 'mnemonics[0]') They happen because of the way we intentionally build the table, so silence the warning when building with 'make W=1'. Link: http://lkml.kernel.org/r/8727.1470022083@turing-police.cc.vt.eduSigned-off-by:Valdis Kletnieks <valdis.kletnieks@vt.edu> Signed-off-by:
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Arnd Bergmann authored
/proc/stat shows (among lots of other things) the current boottime (i.e. number of seconds since boot). While a 32-bit number is sufficient for this particular case, we want to get rid of the 'struct timespec' suffers from a 32-bit overflow in 2038. This changes the code to use a struct timespec64, which is known to be safe in all cases. Link: http://lkml.kernel.org/r/20160617201247.2292101-1-arnd@arndb.deSigned-off-by:
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Oleg Nesterov authored
This was needed before to ensure that ->signal != 0 and do_each_thread() is safe, see commit b95c35e7 ("oom: fix the unsafe usage of badness() in proc_oom_score()") for details. Today tsk->signal can't go away and for_each_thread(tsk) is always safe. Link: http://lkml.kernel.org/r/20160608211921.GA15508@redhat.comSigned-off-by:
David Rientjes <rientjes@google.com> Acked-by:
Michal Hocko <mhocko@suse.com> Cc: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp> Signed-off-by:
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Luis de Bethencourt authored
Salah Triki and Luis de Bethencourt are taking over maintainership of befs. Link: http://lkml.kernel.org/r/1469651079-32455-1-git-send-email-luisbg@osg.samsung.comSigned-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org> Acked-by:
Theodore Ts'o <tytso@mit.edu> Signed-off-by:
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seokhoon.yoon authored
cgroup's document path is changed to "cgroup-v1". update it. Link: http://lkml.kernel.org/r/1470148443-6509-1-git-send-email-iamyooon@gmail.comSigned-off-by:
seokhoon.yoon <iamyooon@gmail.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Signed-off-by:
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Nicolas Iooss authored
handle_object_size_mismatch() used %pk to format a kernel pointer with pr_err(). This seemed to be a misspelling for %pK, but using this to format a kernel pointer does not make much sence here. Therefore use %p instead, like in handle_missaligned_access(). Link: http://lkml.kernel.org/r/20160730083010.11569-1-nicolas.iooss_linux@m4x.orgSigned-off-by:
Nicolas Iooss <nicolas.iooss_linux@m4x.org> Acked-by:
Andrey Ryabinin <aryabinin@virtuozzo.com> Cc: Joe Perches <joe@perches.com> Signed-off-by:
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Fabian Frederick authored
Commit 53dad6d3 ("ipc: fix race with LSMs") updated ipc_rcu_putref() to receive rcu freeing function but used generic ipc_rcu_free() instead of msg_rcu_free() which does security cleaning. Running LTP msgsnd06 with kmemleak gives the following: cat /sys/kernel/debug/kmemleak unreferenced object 0xffff88003c0a11f8 (size 8): comm "msgsnd06", pid 1645, jiffies 4294672526 (age 6.549s) hex dump (first 8 bytes): 1b 00 00 00 01 00 00 00 ........ backtrace: kmemleak_alloc+0x23/0x40 kmem_cache_alloc_trace+0xe1/0x180 selinux_msg_queue_alloc_security+0x3f/0xd0 security_msg_queue_alloc+0x2e/0x40 newque+0x4e/0x150 ipcget+0x159/0x1b0 SyS_msgget+0x39/0x40 entry_SYSCALL_64_fastpath+0x13/0x8f Manfred Spraul suggested to fix sem.c as well and Davidlohr Bueso to only use ipc_rcu_free in case of security allocation failure in newary() Fixes: 53dad6d3 ("ipc: fix race with LSMs") Link: http://lkml.kernel.org/r/1470083552-22966-1-git-send-email-fabf@skynet.beSigned-off-by:
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Vladimir Davydov authored
We must call shrink_slab() for each memory cgroup on both global and memcg reclaim in shrink_node_memcg(). Commit d71df22b55099 accidentally changed that so that now shrink_slab() is only called with memcg != NULL on memcg reclaim. As a result, memcg-aware shrinkers (including dentry/inode) are never invoked on global reclaim. Fix that. Fixes: b2e18757 ("mm, vmscan: begin reclaiming pages on a per-node basis") Link: http://lkml.kernel.org/r/1470056590-7177-1-git-send-email-vdavydov@virtuozzo.comSigned-off-by:
Vladimir Davydov <vdavydov@virtuozzo.com> Acked-by:
Johannes Weiner <hannes@cmpxchg.org> Acked-by:
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Vladimir Davydov authored
Radix trees may be used not only for storing page cache pages, so unconditionally accounting radix tree nodes to the current memory cgroup is bad: if a radix tree node is used for storing data shared among different cgroups we risk pinning dead memory cgroups forever. So let's only account radix tree nodes if it was explicitly requested by passing __GFP_ACCOUNT to INIT_RADIX_TREE. Currently, we only want to account page cache entries, so mark mapping->page_tree so. Fixes: 58e698af ("radix-tree: account radix_tree_node to memory cgroup") Link: http://lkml.kernel.org/r/1470057188-7864-1-git-send-email-vdavydov@virtuozzo.comSigned-off-by:
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Alexander Potapenko authored
If the total amount of memory assigned to quarantine is less than the amount of memory assigned to per-cpu quarantines, |new_quarantine_size| may overflow. Instead, set it to zero. [akpm@linux-foundation.org: cleanup: use WARN_ONCE return value] Link: http://lkml.kernel.org/r/1470063563-96266-1-git-send-email-glider@google.com Fixes: 55834c59 ("mm: kasan: initial memory quarantine implementation") Signed-off-by:
Alexander Potapenko <glider@google.com> Reported-by:
Dmitry Vyukov <dvyukov@google.com> Cc: Andrey Ryabinin <aryabinin@virtuozzo.com> Signed-off-by:
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Andrey Ryabinin authored
Currently we just dump stack in case of double free bug. Let's dump all info about the object that we have. [aryabinin@virtuozzo.com: change double free message per Alexander] Link: http://lkml.kernel.org/r/1470153654-30160-1-git-send-email-aryabinin@virtuozzo.com Link: http://lkml.kernel.org/r/1470062715-14077-6-git-send-email-aryabinin@virtuozzo.comSigned-off-by:
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Andrey Ryabinin authored
The state of object currently tracked in two places - shadow memory, and the ->state field in struct kasan_alloc_meta. We can get rid of the latter. The will save us a little bit of memory. Also, this allow us to move free stack into struct kasan_alloc_meta, without increasing memory consumption. So now we should always know when the last time the object was freed. This may be useful for long delayed use-after-free bugs. As a side effect this fixes following UBSAN warning: UBSAN: Undefined behaviour in mm/kasan/quarantine.c:102:13 member access within misaligned address ffff88000d1efebc for type 'struct qlist_node' which requires 8 byte alignment Link: http://lkml.kernel.org/r/1470062715-14077-5-git-send-email-aryabinin@virtuozzo.comReported-by:
kernel test robot <xiaolong.ye@intel.com> Signed-off-by:
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Andrey Ryabinin authored
Size of slab object already stored in cache->object_size. Note, that kmalloc() internally rounds up size of allocation, so object_size may be not equal to alloc_size, but, usually we don't need to know the exact size of allocated object. In case if we need that information, we still can figure it out from the report. The dump of shadow memory allows to identify the end of allocated memory, and thereby the exact allocation size. Link: http://lkml.kernel.org/r/1470062715-14077-4-git-send-email-aryabinin@virtuozzo.comSigned-off-by:
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Andrey Ryabinin authored
SLUB doesn't require disabled interrupts to call ___cache_free(). Link: http://lkml.kernel.org/r/1470062715-14077-3-git-send-email-aryabinin@virtuozzo.comSigned-off-by:
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Andrey Ryabinin authored
Currently we call quarantine_reduce() for ___GFP_KSWAPD_RECLAIM (implied by __GFP_RECLAIM) allocation. So, basically we call it on almost every allocation. quarantine_reduce() sometimes is heavy operation, and calling it with disabled interrupts may trigger hard LOCKUP: NMI watchdog: Watchdog detected hard LOCKUP on cpu 2irq event stamp: 1411258 Call Trace: <NMI> dump_stack+0x68/0x96 watchdog_overflow_callback+0x15b/0x190 __perf_event_overflow+0x1b1/0x540 perf_event_overflow+0x14/0x20 intel_pmu_handle_irq+0x36a/0xad0 perf_event_nmi_handler+0x2c/0x50 nmi_handle+0x128/0x480 default_do_nmi+0xb2/0x210 do_nmi+0x1aa/0x220 end_repeat_nmi+0x1a/0x1e <<EOE>> __kernel_text_address+0x86/0xb0 print_context_stack+0x7b/0x100 dump_trace+0x12b/0x350 save_stack_trace+0x2b/0x50 set_track+0x83/0x140 free_debug_processing+0x1aa/0x420 __slab_free+0x1d6/0x2e0 ___cache_free+0xb6/0xd0 qlist_free_all+0x83/0x100 quarantine_reduce+0x177/0x1b0 kasan_kmalloc+0xf3/0x100 Reduce the quarantine_reduce iff direct reclaim is allowed. Fixes: 55834c59("mm: kasan: initial memory quarantine implementation") Link: http://lkml.kernel.org/r/1470062715-14077-2-git-send-email-aryabinin@virtuozzo.comSigned-off-by:
Dave Jones <davej@codemonkey.org.uk> Acked-by:
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Andrey Ryabinin authored
Once an object is put into quarantine, we no longer own it, i.e. object could leave the quarantine and be reallocated. So having set_track() call after the quarantine_put() may corrupt slab objects. BUG kmalloc-4096 (Not tainted): Poison overwritten ----------------------------------------------------------------------------- Disabling lock debugging due to kernel taint INFO: 0xffff8804540de850-0xffff8804540de857. First byte 0xb5 instead of 0x6b ... INFO: Freed in qlist_free_all+0x42/0x100 age=75 cpu=3 pid=24492 __slab_free+0x1d6/0x2e0 ___cache_free+0xb6/0xd0 qlist_free_all+0x83/0x100 quarantine_reduce+0x177/0x1b0 kasan_kmalloc+0xf3/0x100 kasan_slab_alloc+0x12/0x20 kmem_cache_alloc+0x109/0x3e0 mmap_region+0x53e/0xe40 do_mmap+0x70f/0xa50 vm_mmap_pgoff+0x147/0x1b0 SyS_mmap_pgoff+0x2c7/0x5b0 SyS_mmap+0x1b/0x30 do_syscall_64+0x1a0/0x4e0 return_from_SYSCALL_64+0x0/0x7a INFO: Slab 0xffffea0011503600 objects=7 used=7 fp=0x (null) flags=0x8000000000004080 INFO: Object 0xffff8804540de848 @offset=26696 fp=0xffff8804540dc588 Redzone ffff8804540de840: bb bb bb bb bb bb bb bb ........ Object ffff8804540de848: 6b 6b 6b 6b 6b 6b 6b 6b b5 52 00 00 f2 01 60 cc kkkkkkkk.R....`. Similarly, poisoning after the quarantine_put() leads to false positive use-after-free reports: BUG: KASAN: use-after-free in anon_vma_interval_tree_insert+0x304/0x430 at addr ffff880405c540a0 Read of size 8 by task trinity-c0/3036 CPU: 0 PID: 3036 Comm: trinity-c0 Not tainted 4.7.0-think+ #9 Call Trace: dump_stack+0x68/0x96 kasan_report_error+0x222/0x600 __asan_report_load8_noabort+0x61/0x70 anon_vma_interval_tree_insert+0x304/0x430 anon_vma_chain_link+0x91/0xd0 anon_vma_clone+0x136/0x3f0 anon_vma_fork+0x81/0x4c0 copy_process.part.47+0x2c43/0x5b20 _do_fork+0x16d/0xbd0 SyS_clone+0x19/0x20 do_syscall_64+0x1a0/0x4e0 entry_SYSCALL64_slow_path+0x25/0x25 Fix this by putting an object in the quarantine after all other operations. Fixes: 80a9201a ("mm, kasan: switch SLUB to stackdepot, enable memory quarantine for SLUB") Link: http://lkml.kernel.org/r/1470062715-14077-1-git-send-email-aryabinin@virtuozzo.comSigned-off-by:
Vegard Nossum <vegard.nossum@oracle.com> Reported-by:
Sasha Levin <alexander.levin@verizon.com> Acked-by:
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Michal Hocko authored
We've had a report about soft lockups caused by lock bouncing in the soft reclaim path: BUG: soft lockup - CPU#0 stuck for 22s! [kav4proxy-kavic:3128] RIP: 0010:[<ffffffff81469798>] [<ffffffff81469798>] _raw_spin_lock+0x18/0x20 Call Trace: mem_cgroup_soft_limit_reclaim+0x25a/0x280 shrink_zones+0xed/0x200 do_try_to_free_pages+0x74/0x320 try_to_free_pages+0x112/0x180 __alloc_pages_slowpath+0x3ff/0x820 __alloc_pages_nodemask+0x1e9/0x200 alloc_pages_vma+0xe1/0x290 do_wp_page+0x19f/0x840 handle_pte_fault+0x1cd/0x230 do_page_fault+0x1fd/0x4c0 page_fault+0x25/0x30 There are no memcgs created so there cannot be any in the soft limit excess obviously: [...] memory 0 1 1 so all this just seems to be mem_cgroup_largest_soft_limit_node trying to get spin_lock_irq(&mctz->lock) just to find out that the soft limit excess tree is empty. This is just pointless wasting of cycles and cache line bouncing during heavy parallel reclaim on large machines. The particular machine wasn't very healthy and most probably suffering from a memory leak which just caused the memory reclaim to trash heavily. But bouncing on the lock certainly didn't help... Fix this by optimistic lockless check and bail out early if the tree is empty. This is theoretically racy but that shouldn't matter all that much. First of all soft limit is a best effort feature and it is slowly getting deprecated and its usage should be really scarce. Bouncing on a lock without a good reason is surely much bigger problem, especially on large CPU machines. Link: http://lkml.kernel.org/r/1470073277-1056-1-git-send-email-mhocko@kernel.orgSigned-off-by: -
Michal Hocko authored
Zhong Jiang has reported a BUG_ON from huge_pte_alloc hitting when he runs his database load with memory online and offline running in parallel. The reason is that huge_pmd_share might detect a shared pmd which is currently migrated and so it has migration pte which is !pte_huge. There doesn't seem to be any easy way to prevent from the race and in fact seeing the migration swap entry is not harmful. Both callers of huge_pte_alloc are prepared to handle them. copy_hugetlb_page_range will copy the swap entry and make it COW if needed. hugetlb_fault will back off and so the page fault is retries if the page is still under migration and waits for its completion in hugetlb_fault. That means that the BUG_ON is wrong and we should update it. Let's simply check that all present ptes are pte_huge instead. Link: http://lkml.kernel.org/r/20160721074340.GA26398@dhcp22.suse.czSigned-off-by:
zhongjiang <zhongjiang@huawei.com> Acked-by:
Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Signed-off-by:
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Jia He authored
In powerpc servers with large memory(32TB), we watched several soft lockups for hugepage under stress tests. The call traces are as follows: 1. get_page_from_freelist+0x2d8/0xd50 __alloc_pages_nodemask+0x180/0xc20 alloc_fresh_huge_page+0xb0/0x190 set_max_huge_pages+0x164/0x3b0 2. prep_new_huge_page+0x5c/0x100 alloc_fresh_huge_page+0xc8/0x190 set_max_huge_pages+0x164/0x3b0 This patch fixes such soft lockups. It is safe to call cond_resched() there because it is out of spin_lock/unlock section. Link: http://lkml.kernel.org/r/1469674442-14848-1-git-send-email-hejianet@gmail.comSigned-off-by:
Jia He <hejianet@gmail.com> Reviewed-by:
Dave Hansen <dave.hansen@linux.intel.com> Cc: Mike Kravetz <mike.kravetz@oracle.com> Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Cc: Paul Gortmaker <paul.gortmaker@windriver.com> Cc: <stable@vger.kernel.org> Signed-off-by:
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Valdis Kletnieks authored
Apparently, the tools/testing version dates to a few flags ago, and we've sprouted 4 new ones since. Keep in sync with the value in the main tree... Link: http://lkml.kernel.org/r/23400.1469702675@turing-police.cc.vt.eduSigned-off-by:
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Minchan Kim authored
Every swap-in anonymous page starts from inactive lru list's head. It should be activated unconditionally when VM decide to reclaim because page table entry for the page always usually has marked accessed bit. Thus, their window size for getting a new referece is 2 * NR_inactive + NR_active while others is NR_inactive + NR_active. It's not fair that it has more chance to be referenced compared to other newly allocated page which starts from active lru list's head. Johannes: : The page can still have a valid copy on the swap device, so prefering to : reclaim that page over a fresh one could make sense. But as you point : out, having it start inactive instead of active actually ends up giving it : *more* LRU time, and that seems to be without justification. Rik: : The reason newly read in swap cache pages start on the inactive list is : that we do some amount of read-around, and do not know which pages will : get used. : : However, immediately activating the ones that DO get used, like your patch : does, is the right thing to do. Link: http://lkml.kernel.org/r/1469762740-17860-1-git-send-email-minchan@kernel.orgSigned-off-by:
Minchan Kim <minchan@kernel.org> Acked-by:
Rik van Riel <riel@redhat.com> Cc: Nadav Amit <nadav.amit@gmail.com> Cc: Mel Gorman <mgorman@techsingularity.net> Signed-off-by:
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Vegard Nossum authored
I ran into this: BUG: sleeping function called from invalid context at mm/page_alloc.c:3784 in_atomic(): 0, irqs_disabled(): 0, pid: 1434, name: trinity-c1 2 locks held by trinity-c1/1434: #0: (&mm->mmap_sem){......}, at: [<ffffffff810ce31e>] __do_page_fault+0x1ce/0x8f0 #1: (rcu_read_lock){......}, at: [<ffffffff81378f86>] filemap_map_pages+0xd6/0xdd0 CPU: 0 PID: 1434 Comm: trinity-c1 Not tainted 4.7.0+ #58 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Ubuntu-1.8.2-1ubuntu1 04/01/2014 Call Trace: dump_stack+0x65/0x84 panic+0x185/0x2dd ___might_sleep+0x51c/0x600 __might_sleep+0x90/0x1a0 __alloc_pages_nodemask+0x5b1/0x2160 alloc_pages_current+0xcc/0x370 pte_alloc_one+0x12/0x90 __pte_alloc+0x1d/0x200 alloc_set_pte+0xe3e/0x14a0 filemap_map_pages+0x42b/0xdd0 handle_mm_fault+0x17d5/0x28b0 __do_page_fault+0x310/0x8f0 trace_do_page_fault+0x18d/0x310 do_async_page_fault+0x27/0xa0 async_page_fault+0x28/0x30 The important bits from the above is that filemap_map_pages() is calling into the page allocator while holding rcu_read_lock (sleeping is not allowed inside RCU read-side critical sections). According to Kirill Shutemov, the prefaulting code in do_fault_around() is supposed to take care of this, but missing error handling means that the allocation failure can go unnoticed. We don't need to return VM_FAULT_OOM (or any other error) here, since we can just let the normal fault path try again. Fixes: 7267ec00 ("mm: postpone page table allocation until we have page to map") Link: http://lkml.kernel.org/r/1469708107-11868-1-git-send-email-vegard.nossum@oracle.comSigned-off-by:Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: "Hillf Danton" <hillf.zj@alibaba-inc.com> Signed-off-by:
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piaojun authored
We found a dlm-blocked situation caused by continuous breakdown of recovery masters described below. To solve this problem, we should purge recovery lock once detecting recovery master goes down. N3 N2 N1(reco master) go down pick up recovery lock and begin recoverying for N2 go down pick up recovery lock failed, then purge it: dlm_purge_lockres ->DROPPING_REF is set send deref to N1 failed, recovery lock is not purged find N1 go down, begin recoverying for N1, but blocked in dlm_do_recovery as DROPPING_REF is set: dlm_do_recovery ->dlm_pick_recovery_master ->dlmlock ->dlm_get_lock_resource ->__dlm_wait_on_lockres_flags(tmpres, DLM_LOCK_RES_DROPPING_REF); Fixes: 8c034396 ("ocfs2/dlm: clear DROPPING_REF flag when the master goes down") Link: http://lkml.kernel.org/r/578453AF.8030404@huawei.comSigned-off-by:Jun Piao <piaojun@huawei.com> Reviewed-by:
Joseph Qi <joseph.qi@huawei.com> Reviewed-by:
Jiufei Xue <xuejiufei@huawei.com> Reviewed-by:
Mark Fasheh <mfasheh@suse.de> Cc: Joel Becker <jlbec@evilplan.org> Cc: Junxiao Bi <junxiao.bi@oracle.com> Signed-off-by:
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piaojun authored
We found a BUG situation that lockres is migrated during deref described below. To solve the BUG, we could purge lockres directly when other node says I did not have a ref. Additionally, we'd better purge lockres if master goes down, as no one will response deref done. Node 1 Node 2(old master) Node3(new master) dlm_purge_lockres send deref to N2 leave domain migrate lockres to N3 finish migration send do assert master to N1 receive do assert msg form N3, but can not find lockres because DROPPING_REF is set, so the owner is still N2. receive deref from N1 and response -EINVAL because lockres is migrated BUG when receive -EINVAL in dlm_drop_lockres_ref Fixes: 842b90b6 ("ocfs2/dlm: return in progress if master can not clear the refmap bit right now") Link: http://lkml.kernel.org/r/57845103.3070406@huawei.comSigned-off-by: -
piaojun authored
ocfs2/dlm: disable BUG_ON when DLM_LOCK_RES_DROPPING_REF is cleared before dlm_deref_lockres_done_handler We found a BUG situation in which DLM_LOCK_RES_DROPPING_REF is cleared unexpected that described below. To solve the bug, we disable the BUG_ON and purge lockres in dlm_do_local_recovery_cleanup. Node 1 Node 2(master) dlm_purge_lockres dlm_deref_lockres_handler DLM_LOCK_RES_SETREF_INPROG is set response DLM_DEREF_RESPONSE_INPROG receive DLM_DEREF_RESPONSE_INPROG stop puring in dlm_purge_lockres and wait for DLM_DEREF_RESPONSE_DONE dispatch dlm_deref_lockres_worker response DLM_DEREF_RESPONSE_DONE receive DLM_DEREF_RESPONSE_DONE and prepare to purge lockres Node 2 goes down find Node2 down and do local clean up for Node2: dlm_do_local_recovery_cleanup -> clear DLM_LOCK_RES_DROPPING_REF when purging lockres, BUG_ON happens because DLM_LOCK_RES_DROPPING_REF is clear: dlm_deref_lockres_done_handler ->BUG_ON(!(res->state & DLM_LOCK_RES_DROPPING_REF)); [akpm@linux-foundation.org: fix duplicated write to `ret'] Fixes: 60d663cb ("ocfs2/dlm: add DEREF_DONE message") Link: http://lkml.kernel.org/r/57845055.9080702@huawei.comSigned-off-by: -
Eric Ren authored
The testcase "mmaptruncate" in ocfs2 test suite always fails with ENOSPC error on small volume (say less than 10G). This testcase repeatedly performs "extend" and "truncate" on a file. Continuously, it truncates the file to 1/2 of the size, and then extends to 100% of the size. The main bitmap will quickly run out of space because the "truncate" code prevent truncate log from being flushed by ocfs2_schedule_truncate_log_flush(osb, 1), while truncate log may have cached lots of clusters. So retry to allocate after flushing truncate log when ENOSPC is returned. And we cannot reuse the deleted blocks before the transaction committed. Fortunately, we already have a function to do this - ocfs2_try_to_free_truncate_log(). Just need to remove the "static" modifier and put it into the right place. The "unlock"/"lock" code isn't elegant, but there seems to be no better option. [zren@suse.com: locking fix] Link: http://lkml.kernel.org/r/1468031546-4797-1-git-send-email-zren@suse.com Link: http://lkml.kernel.org/r/1466586469-5541-1-git-send-email-zren@suse.comSigned-off-by:
Eric Ren <zren@suse.com> Reviewed-by:
Gang He <ghe@suse.com> Reviewed-by:
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Gang He authored
We encountered a bug from the customer, the user did a fsck.ocfs2 on the file system and exited unusually, the lockspace (with LVB size = 32) was left in the kernel space, next, the user mounted this file system, the kernel module did not create a new lockspace (LVB size = 64) via calling dlm_new_lockspace() function in mounting stage, just used the existing lockspace, created by the user space tool, this would lead the user was not able to mount this file system from the other nodes, with the error message like: dlm: 032F5......: config mismatch: 64,0 nodeid 177127961: 32,0 (mount.ocfs2,26981,46):ocfs2_dlm_init:2995 ERROR: status = -71 ocfs2_mount_volume:1881 ERROR: status = -71 ocfs2_fill_super:1236 ERROR: status = -71 The user found it very difficult to find the root cause, then, we brought out this patch to relieve such problem. First, we add one more flag in calling dlm_new_lockspace() function, to make sure the lockspace is created by kernel module itself, and this change will not affect the backward compatibility. Second, the obvious error message is reported in the kernel log, let the user be more easy to find the root cause. This patch will be used to insure the dlm lockspace is created by kernel module when mounting a ocfs2 file system. There are two ways to create a lockspace, from user space and kernel space, but the same name lockspaces probably have different lvblen lengths/flags. To avoid this mix using, we add one more flag DLM_LSFL_NEWEXCL, it will make sure the dlm lockspace is created by kernel module when mounting. Secondly, if a user space program (ocfs2-tools) is running on a file system, the user tries to mount this file system in the cluster, DLM module will return a -EEXIST or -EPROTO errno, we should give the user a obvious error message, then, the user can let that user space tool exit before mounting the file system again. Link: http://lkml.kernel.org/r/1463731940-13044-2-git-send-email-ghe@suse.comSigned-off-by:
Goldwyn Rodrigues <rgoldwyn@suse.com> Reviewed-by:
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git://git.kernel.org/pub/scm/linux/kernel/git/s390/linuxLinus Torvalds authored
Pull more s390 updates from Martin Schwidefsky: - some cleanup for the hugetlbfs pte/pmd conversion functions - the code to check for the minimum CPU type is converted from assembler to C and an informational message is added in case the CPU is not new enough to run the kernel - bug fixes * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: s390/ftrace/jprobes: Fix conflict between jprobes and function graph tracing s390: Define AT_VECTOR_SIZE_ARCH for ARCH_DLINFO s390/zcrypt: fix possible memory leak in ap_module_init() s390/numa: only set possible nodes within node_possible_map s390/als: fix compile with gcov enabled s390/facilities: do not generate DWORDS define anymore s390/als: print missing facilities on facility mismatch s390/als: print machine type on facility mismatch s390/als: convert architecture level set code to C s390/sclp: move uninitialized data to data section s390/zcrypt: Fix zcrypt suspend/resume behavior s390/cio: fix premature wakeup during chp configure s390/cio: convert cfg_lock mutex to spinlock s390/mm: clean up pte/pmd encoding
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git://people.freedesktop.org/~airlied/linuxLinus Torvalds authored
Merge drm updates from Dave Airlie: "This is the main drm pull request for 4.8. I'm down with a cold at the moment so hopefully this isn't in too bad a state, I finished pulling stuff last week mostly (nouveau fixes just went in today), so only this message should be influenced by illness. Apologies to anyone who's major feature I missed :-) Core: Lockless GEM BO freeing Non-blocking atomic work Documentation changes (rst/sphinx) Prep for new fencing changes Simple display helpers Master/auth changes Register/unregister rework Loads of trivial patches/fixes. New stuff: ARM Mali display driver (not the 3D chip) sii902x RGB->HDMI bridge Panel: Support for new panels Improved backlight support Bridge: Convert ADV7511 to bridge driver ADV7533 support TC358767 (DSI/DPI to eDP) encoder chip support i915: BXT support enabled by default GVT-g infrastructure GuC command submission and fixes BXT workarounds SKL/BKL workarounds Demidlayering device registration Thundering herd fixes Missing pci ids Atomic updates amdgpu/radeon: ATPX improvements for better dGPU power control on PX systems New power features for CZ/BR/ST Pipelined BO moves and evictions in TTM GPU scheduler improvements GPU reset improvements Overclocking on dGPUs with amdgpu Polaris powermanagement enabled nouveau: GK20A/GM20B volt and clock improvements. Initial support for GP100/GP104 GPUs, GP104 will not yet support acceleration due to NVIDIA having not released firmware for them as of yet. exynos: Exynos5433 SoC with IOMMU support. vc4: Shader validation for branching imx-drm: Atomic mode setting conversion Reworked DMFC FIFO allocation External bridge support analogix-dp: RK3399 eDP support Lots of fixes. rockchip: Lots of small fixes. msm: DT bindings cleanups Shrinker and madvise support ASoC HDMI codec support tegra: Host1x driver cleanups SOR reworking for DP support Runtime PM support omapdrm: PLL enhancements Header refactoring Gamma table support arcgpu: Simulator support virtio-gpu: Atomic modesetting fixes. rcar-du: Misc fixes. mediatek: MT8173 HDMI support sti: ASOC HDMI codec support Minor fixes fsl-dcu: Suspend/resume support Bridge support amdkfd: Minor fixes. etnaviv: Enable GPU clock gating hisilicon: Vblank and other fixes" * tag 'drm-for-v4.8' of git://people.freedesktop.org/~airlied/linux: (1575 commits) drm/nouveau/gr/nv3x: fix instobj write offsets in gr setup drm/nouveau/acpi: fix lockup with PCIe runtime PM drm/nouveau/acpi: check for function 0x1B before using it drm/nouveau/acpi: return supported DSM functions drm/nouveau/acpi: ensure matching ACPI handle and supported functions drm/nouveau/fbcon: fix font width not divisible by 8 drm/amd/powerplay: remove enable_clock_power_gatings_tasks from initialize and resume events drm/amd/powerplay: move clockgating to after ungating power in pp for uvd/vce drm/amdgpu: add query device id and revision id into system info entry at CGS drm/amdgpu: add new definition in bif header drm/amd/powerplay: rename smum header guards drm/amdgpu: enable UVD context buffer for older HW drm/amdgpu: fix default UVD context size drm/amdgpu: fix incorrect type of info_id drm/amdgpu: make amdgpu_cgs_call_acpi_method as static drm/amdgpu: comment out unused defaults_staturn_pro static const structure to fix the build drm/amdgpu: enable UVD VM only on polaris drm/amdgpu: increase timeout of IB test drm/amdgpu: add destroy session when generate VCE destroy msg. drm/amd: fix deadlock of job_list_lock V2 ...
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