- 15 Dec, 2020 40 commits
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Yang Shi authored
In the current implementation unmap_and_move() would return -ENOMEM if THP migration is unsupported, then the THP will be split. If split is failed just exit without trying to migrate other pages. It doesn't make too much sense since there may be enough free memory to migrate other pages and there may be a lot base pages on the list. Return -ENOSYS to make consistent with hugetlb. And if THP split is failed just skip and try other pages on the list. Just skip the whole list and exit when free memory is really low. Link: https://lkml.kernel.org/r/20201113205359.556831-6-shy828301@gmail.comSigned-off-by:
Yang Shi <shy828301@gmail.com> Cc: Jan Kara <jack@suse.cz> Cc: Matthew Wilcox <willy@infradead.org> Cc: Mel Gorman <mgorman@suse.de> Cc: Michal Hocko <mhocko@suse.com> Cc: Song Liu <songliubraving@fb.com> Cc: Zi Yan <ziy@nvidia.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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Yang Shi authored
The migrate_prep{_local} never fails, so it is pointless to have return value and check the return value. Link: https://lkml.kernel.org/r/20201113205359.556831-5-shy828301@gmail.comSigned-off-by:Zi Yan <ziy@nvidia.com> Cc: Jan Kara <jack@suse.cz> Cc: Matthew Wilcox <willy@infradead.org> Cc: Mel Gorman <mgorman@suse.de> Cc: Michal Hocko <mhocko@suse.com> Cc: Song Liu <songliubraving@fb.com> Signed-off-by:
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Yang Shi authored
The NUMA balancing skip shared exec base page. Since CONFIG_READ_ONLY_THP_FOR_FS was introduced, there are probably shared exec THP, so skip such THPs for NUMA balancing as well. And Willy's regular filesystem THP support patches could create shared exec THP wven without that config. In addition, the page_is_file_lru() is used to tell if the page is file cache or not, but it filters out shmem page. It sounds like a typical usecase by putting executables in shmem to achieve performance gain via using shmem-THP, so it sounds worth skipping migration for such case too. Link: https://lkml.kernel.org/r/20201113205359.556831-4-shy828301@gmail.comSigned-off-by:
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Yang Shi authored
When unmap_and_move{_huge_page}() returns !-EAGAIN and !MIGRATEPAGE_SUCCESS, the page would be put back to LRU or proper list if it is non-LRU movable page. But, the callers always call putback_movable_pages() to put the failed pages back later on, so it seems not very efficient to put every single page back immediately, and the code looks convoluted. Put the failed page on a separate list, then splice the list to migrate list when all pages are tried. It is the caller's responsibility to call putback_movable_pages() to handle failures. This also makes the code simpler and more readable. After the change the rules are: * Success: non hugetlb page will be freed, hugetlb page will be put back * -EAGAIN: stay on the from list * -ENOMEM: stay on the from list * Other errno: put on ret_pages list then splice to from list The from list would be empty iff all pages are migrated successfully, it was not so before. This has no impact to current existing callsites. Link: https://lkml.kernel.org/r/20201113205359.556831-3-shy828301@gmail.comSigned-off-by: -
Yang Shi authored
Patch series "mm: misc migrate cleanup and improvement", v3. This patch (of 5): The commit 9f4e41f4 ("mm: refactor truncate_complete_page()") refactored truncate_complete_page(), and it is not existed anymore, correct the comment in vmscan and migrate to avoid confusion. Link: https://lkml.kernel.org/r/20201113205359.556831-1-shy828301@gmail.com Link: https://lkml.kernel.org/r/20201113205359.556831-2-shy828301@gmail.comSigned-off-by:
Jan Kara <jack@suse.cz> Cc: Michal Hocko <mhocko@suse.com> Cc: Zi Yan <ziy@nvidia.com> Cc: Song Liu <songliubraving@fb.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Matthew Wilcox <willy@infradead.org> Signed-off-by:
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Matthew Wilcox (Oracle) authored
We can only kmap() one subpage of a THP at a time, so loop over all relevant subpages, skipping ones which don't need to be zeroed. This is too large to inline when THPs are enabled and we actually need highmem, so put it in highmem.c. [willy@infradead.org: start1 was allowed to be less than start2] Link: https://lkml.kernel.org/r/20201124041507.28996-1-willy@infradead.orgSigned-off-by:
Matthew Wilcox (Oracle) <willy@infradead.org> Cc: Yang Shi <shy828301@gmail.com> Cc: Jan Kara <jack@suse.cz> Cc: Michal Hocko <mhocko@suse.com> Cc: Zi Yan <ziy@nvidia.com> Cc: Song Liu <songliubraving@fb.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Naresh Kamboju <naresh.kamboju@linaro.org> Signed-off-by:
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Ralph Campbell authored
When migrating a zero page or pte_none() anonymous page to device private memory, migrate_vma_setup() will initialize the src[] array with a NULL PFN. This lets the device driver allocate device private memory and clear it instead of DMAing a page of zeros over the device bus. Since the source page didn't exist at the time, no struct page was locked nor a migration PTE inserted into the CPU page tables. The actual PTE insertion happens in migrate_vma_pages() when it tries to insert the device private struct page PTE into the CPU page tables. migrate_vma_pages() has to call the mmu notifiers again since another device could fault on the same page before the page table locks are acquired. Allow device drivers to optimize the invalidation similar to migrate_vma_setup() by calling mmu_notifier_range_init() which sets struct mmu_notifier_range event type to MMU_NOTIFY_MIGRATE and the migrate_pgmap_owner field. Link: https://lkml.kernel.org/r/20201021191335.10916-1-rcampbell@nvidia.comSigned-off-by:
Ralph Campbell <rcampbell@nvidia.com> Cc: Jerome Glisse <jglisse@redhat.com> Cc: John Hubbard <jhubbard@nvidia.com> Cc: Alistair Popple <apopple@nvidia.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Jason Gunthorpe <jgg@nvidia.com> Signed-off-by:
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Long Li authored
The word in the comment is misspelled, it should be "include". Link: https://lkml.kernel.org/r/20201024114144.GA20552@lilongSigned-off-by:
Long Li <lonuxli.64@gmail.com> Reviewed-by:
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Hui Su authored
Change the comment of is_dump_unreclaim_slabs(), it just check whether nr_unreclaimable slabs amount is greater than user memory, and explain why we dump unreclaim slabs. Rename it to should_dump_unreclaim_slab() maybe better. Link: https://lkml.kernel.org/r/20201030182704.GA53949@rlkSigned-off-by:
Hui Su <sh_def@163.com> Acked-by:
Michal Hocko <mhocko@suse.com> Signed-off-by:
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Hui Su authored
defer_compaction() and compaction_deferred() and compaction_restarting() in mm/compaction.c won't be used in other files, so make them static, and remove the declaration in the header file. Take the chance to fix a typo. Link: https://lkml.kernel.org/r/20201123170801.GA9625@rlkSigned-off-by:
Vlastimil Babka <vbabka@suse.cz> Cc: Nitin Gupta <nigupta@nvidia.com> Cc: Baoquan He <bhe@redhat.com> Cc: Mateusz Nosek <mateusznosek0@gmail.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Signed-off-by:
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Hui Su authored
Since commit 837d026d ("mm/compaction: more trace to understand when/why compaction start/finish"), the comment place is not suitable. So move compaction_suitable's comment to right place. Link: https://lkml.kernel.org/r/20201116144121.GA385717@rlkSigned-off-by:
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Yanfei Xu authored
There are two 'start_pfn' declared in compact_zone() which have different meanings. Rename the second one to 'iteration_start_pfn' to prevent confusion. Also, remove an useless semicolon. Link: https://lkml.kernel.org/r/20201019115044.1571-1-yanfei.xu@windriver.comSigned-off-by:
Yanfei Xu <yanfei.xu@windriver.com> Acked-by:
David Hildenbrand <david@redhat.com> Acked-by:
Pankaj Gupta <pankaj.gupta.linux@gmail.com> Signed-off-by:
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Vitaly Wool authored
Replace get_cpu_ptr() with migrate_disable()+this_cpu_ptr() so RT can take spinlocks that become sleeping locks. Signed-off-by Mike Galbraith <efault@gmx.de> Link: https://lkml.kernel.org/r/20201209145151.18994-3-vitaly.wool@konsulko.comSigned-off-by:
Vitaly Wool <vitaly.wool@konsulko.com> Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by:
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Vitaly Wool authored
Use temporary slots in reclaim function to avoid possible race when freeing those. While at it, make sure we check CLAIMED flag under page lock in the reclaim function to make sure we are not racing with z3fold_alloc(). Link: https://lkml.kernel.org/r/20201209145151.18994-4-vitaly.wool@konsulko.comSigned-off-by:
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Vitaly Wool authored
Patch series "z3fold: stability / rt fixes". Address z3fold stability issues under stress load, primarily in the reclaim and free aspects. Besides, it fixes the locking problems that were only seen in real-time kernel configuration. This patch (of 3): There used to be two places in the code where slots could be freed, namely when freeing the last allocated handle from the slots and when releasing the z3fold header these slots aree linked to. The logic to decide on whether to free certain slots was complicated and error prone in both functions and it led to failures in RT case. To fix that, make free_handle() the single point of freeing slots. Link: https://lkml.kernel.org/r/20201209145151.18994-1-vitaly.wool@konsulko.com Link: https://lkml.kernel.org/r/20201209145151.18994-2-vitaly.wool@konsulko.comSigned-off-by:
Mike Galbraith <efault@gmx.de> Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Cc: <stable@vger.kernel.org> Signed-off-by:
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Muchun Song authored
A max order page has no buddy page and never merges to another order. So isolating and then freeing it is pointless. Link: https://lkml.kernel.org/r/20201202122114.75316-1-songmuchun@bytedance.com Fixes: 3c605096 ("mm/page_alloc: restrict max order of merging on isolated pageblock") Signed-off-by:
Muchun Song <songmuchun@bytedance.com> Reviewed-by:
Oscar Salvador <osalvador@suse.de> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Matthew Wilcox <willy@infradead.org> Signed-off-by:
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logic.yu authored
No point in having the filename inside the file. Link: https://lkml.kernel.org/r/20201115141541.3878-1-hymmsx.yu@gmail.comSigned-off-by:
logic.yu <hymmsx.yu@gmail.com> Reviewed-by:
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Lukas Bulwahn authored
The refactoring to kswapd() in commit e716f2eb ("mm, vmscan: prevent kswapd sleeping prematurely due to mismatched classzone_idx") turned an assignment to reclaim_order into a dead store, as in all further paths, reclaim_order will be assigned again before it is used. make clang-analyzer on x86_64 tinyconfig caught my attention with: mm/vmscan.c: warning: Although the value stored to 'reclaim_order' is used in the enclosing expression, the value is never actually read from 'reclaim_order' [clang-analyzer-deadcode.DeadStores] Compilers will detect this unneeded assignment and optimize this anyway. So, the resulting binary is identical before and after this change. Simplify the code and remove unneeded assignment to make clang-analyzer happy. No functional change. No change in binary code. Link: https://lkml.kernel.org/r/20201004125827.17679-1-lukas.bulwahn@gmail.comSigned-off-by:
Lukas Bulwahn <lukas.bulwahn@gmail.com> Acked-by:
Mel Gorman <mgorman@techsingularity.net> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Michal Hocko <mhocko@suse.com> Cc: Nathan Chancellor <natechancellor@gmail.com> Cc: Nick Desaulniers <ndesaulniers@google.com> Signed-off-by:
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Johannes Weiner authored
On 2-node NUMA hosts we see bursts of kswapd reclaim and subsequent pressure spikes and stalls from cache refaults while there is plenty of free memory in the system. Usually, kswapd is woken up when all eligible nodes in an allocation are full. But the code related to watermark boosting can wake kswapd on one full node while the other one is mostly empty. This may be justified to fight fragmentation, but is currently unconditionally done whether watermark boosting is occurring or not. In our case, many of our workloads' throughput scales with available memory, and pure utilization is a more tangible concern than trends around longer-term fragmentation. As a result we generally disable watermark boosting. Wake kswapd only woken when watermark boosting is requested. Link: https://lkml.kernel.org/r/20201020175833.397286-1-hannes@cmpxchg.org Fixes: 1c30844d ("mm: reclaim small amounts of memory when an external fragmentation event occurs") Signed-off-by:
Johannes Weiner <hannes@cmpxchg.org> Acked-by:
Mel Gorman <mgorman@suse.de> Signed-off-by:
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Dan Carpenter authored
Preserve the error code from region_add() instead of returning success. Link: https://lkml.kernel.org/r/X9NGZWnZl5/Mt99R@mwanda Fixes: 0db9d74e ("hugetlb: disable region_add file_region coalescing") Signed-off-by:
Dan Carpenter <dan.carpenter@oracle.com> Reviewed-by:
Mike Kravetz <mike.kravetz@oracle.com> Reviewed-by:
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Oscar Salvador authored
hugetlb_add_hstate initializes nr_huge_pages and free_huge_pages to 0, but since hstates[] is a global variable, all its fields are defined to 0 already. Link: https://lkml.kernel.org/r/20201119112141.6452-1-osalvador@suse.deSigned-off-by:
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Liu Xiang authored
On 64-bit machine, delta variable in hugetlb_acct_memory() may be larger than 0xffffffff, but gather_surplus_pages() can only use the low 32-bit value now. So we need to fix type of delta parameter and related local variables in gather_surplus_pages(). Link: https://lkml.kernel.org/r/1605793733-3573-1-git-send-email-liu.xiang@zlingsmart.comReported-by:
Ma Chenggong <ma.chenggong@zlingsmart.com> Signed-off-by:
Liu Xiang <liu.xiang@zlingsmart.com> Signed-off-by:
Pan Jiagen <pan.jiagen@zlingsmart.com> Reviewed-by:
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Alex Shi authored
Add missed parameter explanation for some kernel-doc warnings: mm/khugepaged.c:102: warning: Function parameter or member 'nr_pte_mapped_thp' not described in 'mm_slot' mm/khugepaged.c:102: warning: Function parameter or member 'pte_mapped_thp' not described in 'mm_slot' mm/khugepaged.c:1424: warning: Function parameter or member 'mm' not described in 'collapse_pte_mapped_thp' mm/khugepaged.c:1424: warning: Function parameter or member 'addr' not described in 'collapse_pte_mapped_thp' mm/khugepaged.c:1626: warning: Function parameter or member 'mm' not described in 'collapse_file' mm/khugepaged.c:1626: warning: Function parameter or member 'file' not described in 'collapse_file' mm/khugepaged.c:1626: warning: Function parameter or member 'start' not described in 'collapse_file' mm/khugepaged.c:1626: warning: Function parameter or member 'hpage' not described in 'collapse_file' mm/khugepaged.c:1626: warning: Function parameter or member 'node' not described in 'collapse_file' Link: https://lkml.kernel.org/r/1605597325-25284-1-git-send-email-alex.shi@linux.alibaba.comSigned-off-by:
Alex Shi <alex.shi@linux.alibaba.com> Cc: Randy Dunlap <rdunlap@infradead.org> Cc: Jonathan Corbet <corbet@lwn.net> Signed-off-by:
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Ralph Campbell authored
The external function definitions don't need the "extern" keyword. Remove them so future changes don't copy the function definition style. Link: https://lkml.kernel.org/r/20201106235135.32109-1-rcampbell@nvidia.comSigned-off-by:
Christoph Hellwig <hch@lst.de> Signed-off-by:
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Hui Su authored
We test the page reference count is zero or not here, it can be a bug here if page refercence count is not zero. So we can just use put_page_testzero() instead of page_count(). Link: https://lkml.kernel.org/r/20201007170949.GA6416@rlkSigned-off-by:
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Oscar Salvador authored
Currently, we return -EIO when we fail to migrate the page. Migrations' failures are rather transient as they can happen due to several reasons, e.g: high page refcount bump, mapping->migrate_page failing etc. All meaning that at that time the page could not be migrated, but that has nothing to do with an EIO error. Let us return -EBUSY instead, as we do in case we failed to isolate the page. While are it, let us remove the "ret" print as its value does not change. Link: https://lkml.kernel.org/r/20201209092818.30417-1-osalvador@suse.deSigned-off-by:
Naoya Horiguchi <naoya.horiguchi@nec.com> Acked-by:
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Oscar Salvador authored
madvise_inject_error() uses get_user_pages_fast to translate the address we specified to a page. After [1], we drop the extra reference count for memory_failure() path. That commit says that memory_failure wanted to keep the pin in order to take the page out of circulation. The truth is that we need to keep the page pinned, otherwise the page might be re-used after the put_page() and we can end up messing with someone else's memory. E.g: CPU0 process X CPU1 madvise_inject_error get_user_pages put_page page gets reclaimed process Y allocates the page memory_failure // We mess with process Y memory madvise() is meant to operate on a self address space, so messing with pages that do not belong to us seems the wrong thing to do. To avoid that, let us keep the page pinned for memory_failure as well. Pages for DAX mappings will release this extra refcount in memory_failure_dev_pagemap. [1] ("23e7b5c2: mm, madvise_inject_error: Let memory_failure() optionally take a page reference") Link: https://lkml.kernel.org/r/20201207094818.8518-1-osalvador@suse.de Fixes: 23e7b5c2 ("mm, madvise_inject_error: Let memory_failure() optionally take a page reference") Signed-off-by: -
Oscar Salvador authored
get_hwpoison_page already drains pcplists, previously disabling them when trying to grab a refcount. We do not need shake_page to take care of it anymore. Link: https://lkml.kernel.org/r/20201204102558.31607-4-osalvador@suse.deSigned-off-by:
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Oscar Salvador authored
Currently, we have a sort of retry mechanism to make sure pages in pcp-lists are spilled to the buddy system, so we can handle those. We can save us this extra checks with the new disable-pcplist mechanism that is available with [1]. zone_pcplist_disable makes sure to 1) disable pcplists, so any page that is freed up from that point onwards will end up in the buddy system and 2) drain pcplists, so those pages that already in pcplists are spilled to buddy. With that, we can make a common entry point for grabbing a refcount from both soft_offline and memory_failure paths that is guarded by zone_pcplist_disable/zone_pcplist_enable. [1] https://patchwork.kernel.org/project/linux-mm/cover/20201111092812.11329-1-vbabka@suse.cz/ Link: https://lkml.kernel.org/r/20201204102558.31607-3-osalvador@suse.deSigned-off-by:
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Oscar Salvador authored
Patch series "HWPoison: Refactor get page interface", v2. This patch (of 3): When we want to grab a refcount via get_any_page, we call __get_any_page that calls get_hwpoison_page to get the actual refcount. get_any_page() is only there because we have a sort of retry mechanism in case the page we met is unknown to us or if we raced with an allocation. Also __get_any_page() prints some messages about the page type in case the page was a free page or the page type was unknown, but if anything, we only need to print a message in case the pagetype was unknown, as that is reporting an error down the chain. Let us merge get_any_page() and __get_any_page(), and let the message be printed in soft_offline_page. While we are it, we can also remove the 'pfn' parameter as it is no longer used. Link: https://lkml.kernel.org/r/20201204102558.31607-1-osalvador@suse.de Link: https://lkml.kernel.org/r/20201204102558.31607-2-osalvador@suse.deSigned-off-by:
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Oscar Salvador authored
memory_failure and soft_offline_path paths now drain pcplists by calling get_hwpoison_page. memory_failure flags the page as HWPoison before, so that page cannot longer go into a pcplist, and soft_offline_page only flags a page as HWPoison if 1) we took the page off a buddy freelist 2) the page was in-use and we migrated it 3) was a clean pagecache. Because of that, a page cannot longer be poisoned and be in a pcplist. Link: https://lkml.kernel.org/r/20201013144447.6706-5-osalvador@suse.deSigned-off-by:
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Oscar Salvador authored
The crux of the matter is that historically we left poisoned pages in the buddy system because we have some checks in place when allocating a page that are gatekeeper for poisoned pages. Unfortunately, we do have other users (e.g: compaction [1]) that scan buddy freelists and try to get a page from there without checking whether the page is HWPoison. As I stated already, I think it is fundamentally wrong to keep HWPoison pages within the buddy systems, checks in place or not. Let us fix this the same way we did for soft_offline [2], taking the page off the buddy freelist so it is completely unreachable. Note that this is fairly simple to trigger, as we only need to poison free buddy pages (madvise MADV_HWPOISON) and then run some sort of memory stress system. Just for a matter of reference, I put a dump_page() in compaction_alloc() to trigger for HWPoison patches: page:0000000012b2982b refcount:1 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x1d5db flags: 0xfffffc0800000(hwpoison) raw: 000fffffc0800000 ffffea00007573c8 ffffc90000857de0 0000000000000000 raw: 0000000000000001 0000000000000000 00000001ffffffff 0000000000000000 page dumped because: compaction_alloc CPU: 4 PID: 123 Comm: kcompactd0 Tainted: G E 5.9.0-rc2-mm1-1-default+ #5 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.10.2-0-g5f4c7b1-prebuilt.qemu-project.org 04/01/2014 Call Trace: dump_stack+0x6d/0x8b compaction_alloc+0xb2/0xc0 migrate_pages+0x2a6/0x12a0 compact_zone+0x5eb/0x11c0 proactive_compact_node+0x89/0xf0 kcompactd+0x2d0/0x3a0 kthread+0x118/0x130 ret_from_fork+0x22/0x30 After that, if e.g: a process faults in the page, it will get killed unexpectedly. Fix it by containing the page immediatelly. Besides that, two more changes can be noticed: * MF_DELAYED no longer suits as we are fixing the issue by containing the page immediately, so it does no longer rely on the allocation-time checks to stop HWPoison to be handed over. gain unless it is unpoisoned, so we fixed the situation. Because of that, let us use MF_RECOVERED from now on. * The second block that handles PageBuddy pages is no longer needed: We call shake_page and then check whether the page is Buddy because shake_page calls drain_all_pages, which sends pcp-pages back to the buddy freelists, so we could have a chance to handle free pages. Currently, get_hwpoison_page already calls drain_all_pages, and we call get_hwpoison_page right before coming here, so we should be on the safe side. [1] https://lore.kernel.org/linux-mm/20190826104144.GA7849@linux/T/#u [2] https://patchwork.kernel.org/cover/11792607/ [osalvador@suse.de: take the poisoned subpage off the buddy frelists] Link: https://lkml.kernel.org/r/20201013144447.6706-4-osalvador@suse.de Link: https://lkml.kernel.org/r/20201013144447.6706-3-osalvador@suse.deSigned-off-by: -
Oscar Salvador authored
Patch series "HWpoison: further fixes and cleanups", v5. This patchset includes some more fixes and a cleanup. Patch#2 and patch#3 are both fixes for taking a HWpoison page off a buddy freelist, since having them there has proved to be bad (see [1] and pathch#2's commit log). Patch#3 does the same for hugetlb pages. [1] https://lkml.org/lkml/2020/9/22/565 This patch (of 4): A page with 0-refcount and !PageBuddy could perfectly be a pcppage. Currently, we bail out with an error if we encounter such a page, meaning that we do not handle pcppages neither from hard-offline nor from soft-offline path. Fix this by draining pcplists whenever we find this kind of page and retry the check again. It might be that pcplists have been spilled into the buddy allocator and so we can handle it. Link: https://lkml.kernel.org/r/20201013144447.6706-1-osalvador@suse.de Link: https://lkml.kernel.org/r/20201013144447.6706-2-osalvador@suse.deSigned-off-by:
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Muchun Song authored
When we free a page whose order is very close to MAX_ORDER and greater than pageblock_order, it wastes some CPU cycles to increase max_order to MAX_ORDER one by one and check the pageblock migratetype of that page repeatedly especially when MAX_ORDER is much larger than pageblock_order. We also should not be checking migratetype of buddy when "order == MAX_ORDER - 1" as the buddy pfn may be invalid, so adjust the condition. With the new check, we don't need the max_order check anymore, so we replace it. Also adjust max_order initialization so that it's lower by one than previously, which makes the code hopefully more clear. Link: https://lkml.kernel.org/r/20201204155109.55451-1-songmuchun@bytedance.com Fixes: d9dddbf5 ("mm/page_alloc: prevent merging between isolated and other pageblocks") Signed-off-by:
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Lorenzo Stoakes authored
setup_per_zone_lowmem_reserve() iterates through each zone setting zone->lowmem_reserve[j] = 0 (where j is the zone's index) then iterates backwards through all preceding zones, setting lower_zone->lowmem_reserve[j] = sum(managed pages of higher zones) / lowmem_reserve_ratio[idx] for each (where idx is the lower zone's index). If the lower zone has no managed pages or its ratio is 0 then all of its lowmem_reserve[] entries are effectively zeroed. As these arrays are only assigned here and all lowmem_reserve[] entries for index < this zone's index are implicitly assumed to be 0 (as these are specifically output in show_free_areas() and zoneinfo_show_print() for example) there is no need to additionally zero index == this zone's index too. This patch avoids zeroing unnecessarily. Rather than iterating through zones and setting lowmem_reserve[j] for each lower zone this patch reverse the process and populates each zone's lowmem_reserve[] values in ascending order. This clarifies what is going on especially in the case of zero managed pages or ratio which is now explicitly shown to clear these values. Link: https://lkml.kernel.org/r/20201129162758.115907-1-lstoakes@gmail.comSigned-off-by:
Lorenzo Stoakes <lstoakes@gmail.com> Cc: Baoquan He <bhe@redhat.com> Cc: Michal Hocko <mhocko@suse.com> Cc: Nicholas Piggin <npiggin@gmail.com> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Roman Gushchin <guro@fb.com> Signed-off-by:
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Lin Feng authored
In the booting phase if CONFIG_DEFERRED_STRUCT_PAGE_INIT is set, we have following callchain: start_kernel ... mm_init mem_init memblock_free_all reset_all_zones_managed_pages free_low_memory_core_early ... buffer_init nr_free_buffer_pages zone->managed_pages ... rest_init kernel_init kernel_init_freeable page_alloc_init_late kthread_run(deferred_init_memmap, NODE_DATA(nid), "pgdatinit%d", nid); wait_for_completion(&pgdat_init_all_done_comp); ... files_maxfiles_init It's clear that buffer_init depends on zone->managed_pages, but it's reset in reset_all_zones_managed_pages after that pages are readded into zone->managed_pages, but when buffer_init runs this process is half done and most of them will finally be added till deferred_init_memmap done. In large memory couting of nr_free_buffer_pages drifts too much, also drifting from kernels to kernels on same hardware. Fix is simple, it delays buffer_init run till deferred_init_memmap all done. But as corrected by this patch, max_buffer_heads becomes very large, the value is roughly as many as 4 times of totalram_pages, formula: max_buffer_heads = nrpages * (10%) * (PAGE_SIZE / sizeof(struct buffer_head)); Say in a 64GB memory box we have 16777216 pages, then max_buffer_heads turns out to be roughly 67,108,864. In common cases, should a buffer_head be mapped to one page/block(4KB)? So max_buffer_heads never exceeds totalram_pages. IMO it's likely to make buffer_heads_over_limit bool value alwasy false, then make codes 'if (buffer_heads_over_limit)' test in vmscan unnecessary. So this patch will change the original behavior related to buffer_heads_over_limit in vmscan since we used a half done value of zone->managed_pages before, or should we use a smaller factor(<10%) in previous formula. akpm: I think this is OK - the max_buffer_heads code is only needed on highmem machines, to prevent ZONE_NORMAL from being consumed by large amounts of buffer_heads attached to highmem pagecache. This problem will not occur on 64-bit machines, so this feature's non-functionality on such machines is a feature, not a bug. Link: https://lkml.kernel.org/r/20201123110500.103523-1-linf@wangsu.comSigned-off-by:Lin Feng <linf@wangsu.com> Acked-by:
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David Hildenbrand authored
commit 6471384a ("mm: security: introduce init_on_alloc=1 and init_on_free=1 boot options") resulted with init_on_alloc=1 in all pages leaving the buddy via alloc_pages() and friends to be initialized/cleared/zeroed on allocation. However, the same logic is currently not applied to alloc_contig_pages(): allocated pages leaving the buddy aren't cleared with init_on_alloc=1 and init_on_free=0. Let's also properly clear pages on that allocation path. To achieve that, let's move clearing into post_alloc_hook(). This will not only affect alloc_contig_pages() allocations but also any pages used as migration target in compaction code via compaction_alloc(). While this sounds sub-optimal, it's the very same handling as when allocating migration targets via alloc_migration_target() - pages will get properly cleared with init_on_free=1. In case we ever want to optimize migration in that regard, we should tackle all such migration users - if we believe migration code can be fully trusted. With this change, we will see double clearing of pages in some cases. One example are gigantic pages (either allocated via CMA, or allocated dynamically via alloc_contig_pages()) - which is the right thing to do (and to be optimized outside of the buddy in the callers) as discussed in: https://lkml.kernel.org/r/20201019182853.7467-1-gpiccoli@canonical.com This change implies that with init_on_alloc=1 - All CMA allocations will be cleared - Gigantic pages allocated via alloc_contig_pages() will be cleared - virtio-mem memory to be unplugged will be cleared. While this is suboptimal, it's similar to memory balloon drivers handling, where all pages to be inflated will get cleared as well. - Pages isolated for compaction will be cleared Link: https://lkml.kernel.org/r/20201120180452.19071-1-david@redhat.comSigned-off-by:
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Zou Wei authored
Fix the following sparse warnings: mm/page_alloc.c:3040:6: warning: symbol '__drain_all_pages' was not declared. Should it be static? mm/page_alloc.c:6349:6: warning: symbol '__zone_set_pageset_high_and_batch' was not declared. Should it be static? Link: https://lkml.kernel.org/r/1605517365-65858-1-git-send-email-zou_wei@huawei.comSigned-off-by:
Zou Wei <zou_wei@huawei.com> Acked-by:
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Matthew Wilcox (Oracle) authored
Provide some guidance towards when this might not be the right interface to use. Link: https://lkml.kernel.org/r/20201027025523.3235-1-willy@infradead.orgSigned-off-by:
William Kucharski <william.kucharski@oracle.com> Acked-by:
Mike Rapoport <rppt@linux.ibm.com> Signed-off-by:
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Matthew Wilcox (Oracle) authored
We haven't had 'dontuse' flags since 2002. Replace this obsolete warning with a hopefully more useful one. Link: https://lkml.kernel.org/r/20201027025823.3704-1-willy@infradead.orgSigned-off-by:
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