- 25 Feb, 2017 40 commits
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Aneesh Kumar K.V authored
Without this KSM will consider the page write protected, but a numa fault can later mark the page writable. This can result in memory corruption. Link: http://lkml.kernel.org/r/1487498625-10891-3-git-send-email-aneesh.kumar@linux.vnet.ibm.comSigned-off-by:
Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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Aneesh Kumar K.V authored
Patch series "Numabalancing preserve write fix", v2. This patch series address an issue w.r.t THP migration and autonuma preserve write feature. migrate_misplaced_transhuge_page() cannot deal with concurrent modification of the page. It does a page copy without following the migration pte sequence. IIUC, this was done to keep the migration simpler and at the time of implemenation we didn't had THP page cache which would have required a more elaborate migration scheme. That means thp autonuma migration expect the protnone with saved write to be done such that both kernel and user cannot update the page content. This patch series enables archs like ppc64 to do that. We are good with the hash translation mode with the current code, because we never create a hardware page table entry for a protnone pte. This patch (of 2): Autonuma preserves the write permission across numa fault to avoid taking a writefault after a numa fault (Commit: b191f9b1 " mm: numa: preserve PTE write permissions across a NUMA hinting fault"). Architecture can implement protnone in different ways and some may choose to implement that by clearing Read/ Write/Exec bit of pte. Setting the write bit on such pte can result in wrong behaviour. Fix this up by allowing arch to override how to save the write bit on a protnone pte. [aneesh.kumar@linux.vnet.ibm.com: don't mark pte saved write in case of dirty_accountable] Link: http://lkml.kernel.org/r/1487942884-16517-1-git-send-email-aneesh.kumar@linux.vnet.ibm.com [aneesh.kumar@linux.vnet.ibm.com: v3] Link: http://lkml.kernel.org/r/1487498625-10891-2-git-send-email-aneesh.kumar@linux.vnet.ibm.com Link: http://lkml.kernel.org/r/1487050314-3892-2-git-send-email-aneesh.kumar@linux.vnet.ibm.comSigned-off-by:
Michael Neuling <mikey@neuling.org> Cc: Rik van Riel <riel@surriel.com> Cc: Mel Gorman <mgorman@techsingularity.net> Cc: Paul Mackerras <paulus@samba.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Michael Ellerman <michaele@au1.ibm.com> Signed-off-by:
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Aneesh Kumar K.V authored
Architectures like ppc64, use privilege access bit to mark pte non accessible. This implies that kernel can do a copy_to_user to an address marked for numa fault. This also implies that there can be a parallel hardware update for the pte. set_pte_at cannot be used in such scenarios. Hence switch the pte update to use ptep_get_and_clear and set_pte_at combination. [akpm@linux-foundation.org: remove unwanted ppc change, per Aneesh] Link: http://lkml.kernel.org/r/1486400776-28114-1-git-send-email-aneesh.kumar@linux.vnet.ibm.comSigned-off-by:
Rik van Riel <riel@redhat.com> Acked-by:
Mel Gorman <mgorman@techsingularity.net> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by:
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Steven Rostedt (VMware) authored
Running my likely/unlikely profiler, I discovered that the test in shmem_write_begin() that tests for info->seals as unlikely, is always incorrect. This is because shmem_get_inode() sets info->seals to have F_SEAL_SEAL set by default, and it is unlikely to be cleared when shmem_write_begin() is called. Thus, the if statement is very likely. But as the if statement block only cares about F_SEAL_WRITE and F_SEAL_GROW, change the test to only test those two bits. Link: http://lkml.kernel.org/r/20170203105656.7aec6237@gandalf.local.homeSigned-off-by:
Steven Rostedt (VMware) <rostedt@goodmis.org> Acked-by:
Hugh Dickins <hughd@google.com> Cc: David Herrmann <dh.herrmann@gmail.com> Signed-off-by:
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Mel Gorman authored
Hillf Danton pointed out that since commit 1d82de61 ("mm, vmscan: make kswapd reclaim in terms of nodes") that PGDAT_WRITEBACK is no longer cleared. It was not noticed as triggering it requires pages under writeback to cycle twice through the LRU and before kswapd gets stalled. Historically, such issues tended to occur on small machines writing heavily to slow storage such as a USB stick. Once kswapd stalls, direct reclaim stalls may be higher but due to the fact that memory pressure is required, it would not be very noticable. Michal Hocko suggested removing the flag entirely but the conservative fix is to restore the intended PGDAT_WRITEBACK behaviour and clear the flag when a suitable zone is balanced. Fixes: 1d82de61 ("mm, vmscan: make kswapd reclaim in terms of nodes") Link: http://lkml.kernel.org/r/20170203203222.gq7hk66yc36lpgtb@suse.deSigned-off-by:
Mel Gorman <mgorman@suse.de> Acked-by:
Johannes Weiner <hannes@cmpxchg.org> Acked-by:
Michal Hocko <mhocko@suse.com> Acked-by:
Hillf Danton <hillf.zj@alibaba-inc.com> Cc: Minchan Kim <minchan.kim@gmail.com> Cc: Rik van Riel <riel@redhat.com> Signed-off-by:
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Ross Zwisler authored
The fault wrappers drm_vm_fault(), drm_vm_shm_fault(), drm_vm_dma_fault() and drm_vm_sg_fault() used to provide extra logic beyond what was in the "drm_do_*" versions of these functions, but as of commit ca0b07d9 ("drm: convert drm from nopage to fault") they are just unnecessary wrappers that do nothing. Remove them, and rename the the drm_do_* fault handlers to remove the "do_" since they no longer have corresponding wrappers. Link: http://lkml.kernel.org/r/1486155698-25717-1-git-send-email-ross.zwisler@linux.intel.comSigned-off-by:
Ross Zwisler <ross.zwisler@linux.intel.com> Reviewed-by:
Sean Paul <seanpaul@chromium.org> Acked-by:
Daniel Vetter <daniel.vetter@ffwll.ch> Cc: Dave Jiang <dave.jiang@intel.com> Signed-off-by:
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Tobin C Harding authored
Fix whitespace issues, extraneous braces. Link: http://lkml.kernel.org/r/1485992240-10986-5-git-send-email-me@tobin.ccSigned-off-by:
Tobin C Harding <me@tobin.cc> Signed-off-by:
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Tobin C Harding authored
Patch fixes sparse warning: Using plain integer as NULL pointer. Replaces assignment of 0 to pointer with NULL assignment. Link: http://lkml.kernel.org/r/1485992240-10986-2-git-send-email-me@tobin.ccSigned-off-by:
Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Signed-off-by:
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Masanari Iida authored
Link: http://lkml.kernel.org/r/20170202011942.1609-1-standby24x7@gmail.comSigned-off-by:
Masanari Iida <standby24x7@gmail.com> Signed-off-by:
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Michal Hocko authored
__vmalloc_area_node() allocates pages to cover the requested vmalloc size. This can be a lot of memory. If the current task is killed by the OOM killer, and thus has an unlimited access to memory reserves, it can consume all the memory theoretically. Fix this by checking for fatal_signal_pending and back off early. Link: http://lkml.kernel.org/r/20170201092706.9966-4-mhocko@kernel.orgSigned-off-by:
Christoph Hellwig <hch@lst.de> Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by:
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Jaewon Kim authored
There are many reasons of CMA allocation failure such as EBUSY, ENOMEM, EINTR. But we did not know error reason so far. This patch prints the error value. Additionally if CONFIG_CMA_DEBUG is enabled, this patch shows bitmap status to know available pages. Actually CMA internally tries on all available regions because some regions can be failed because of EBUSY. Bitmap status is useful to know in detail on both ENONEM and EBUSY; ENOMEM: not tried at all because of no available region it could be too small total region or could be fragmentation issue EBUSY: tried some region but all failed This is an ENOMEM example with this patch. [2: Binder:714_1: 744] cma: cma_alloc: alloc failed, req-size: 256 pages, ret: -12 If CONFIG_CMA_DEBUG is enabled, avabile pages also will be shown as concatenated size@position format. So 4@572 means that there are 4 available pages at 572 position starting from 0 position. [2: Binder:714_1: 744] cma: number of available pages: 4@572+7@585+7@601+8@632+38@730+166@1114+127@1921=> 357 free of 2048 total pages Link: http://lkml.kernel.org/r/1485909785-3952-1-git-send-email-jaewon31.kim@samsung.comSigned-off-by:Jaewon Kim <jaewon31.kim@samsung.com> Acked-by:
Michal Nazarewicz <mina86@mina86.com> Cc: Laura Abbott <labbott@redhat.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Signed-off-by:
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David Rientjes authored
If madvise(2) advice will result in the underlying vma being split and the number of areas mapped by the process will exceed /proc/sys/vm/max_map_count as a result, return ENOMEM instead of EAGAIN. EAGAIN is returned by madvise(2) when a kernel resource, such as slab, is temporarily unavailable. It indicates that userspace should retry the advice in the near future. This is important for advice such as MADV_DONTNEED which is often used by malloc implementations to free memory back to the system: we really do want to free memory back when madvise(2) returns EAGAIN because slab allocations (for vmas, anon_vmas, or mempolicies) cannot be allocated. Encountering /proc/sys/vm/max_map_count is not a temporary failure, however, so return ENOMEM to indicate this is a more serious issue. A followup patch to the man page will specify this behavior. Link: http://lkml.kernel.org/r/alpine.DEB.2.10.1701241431120.42507@chino.kir.corp.google.comSigned-off-by:
David Rientjes <rientjes@google.com> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Jerome Marchand <jmarchan@redhat.com> Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Cc: Michael Kerrisk <mtk.manpages@googlemail.com> Cc: Anshuman Khandual <khandual@linux.vnet.ibm.com> Signed-off-by:
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Lucas Stach authored
The callers of the DMA alloc functions already provide the proper context GFP flags. Make sure to pass them through to the CMA allocator, to make the CMA compaction context aware. Link: http://lkml.kernel.org/r/20170127172328.18574-3-l.stach@pengutronix.deSigned-off-by:
Lucas Stach <l.stach@pengutronix.de> Acked-by:
Vlastimil Babka <vbabka@suse.cz> Acked-by:
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Lucas Stach authored
Most users of this interface just want to use it with the default GFP_KERNEL flags, but for cases where DMA memory is allocated it may be called from a different context. No functional change yet, just passing through the flag to the underlying alloc_contig_range function. Link: http://lkml.kernel.org/r/20170127172328.18574-2-l.stach@pengutronix.deSigned-off-by:
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Lucas Stach authored
Currently alloc_contig_range assumes that the compaction should be done with the default GFP_KERNEL flags. This is probably right for all current uses of this interface, but may change as CMA is used in more use-cases (including being the default DMA memory allocator on some platforms). Change the function prototype, to allow for passing through the GFP mask set by upper layers. Also respect global restrictions by applying memalloc_noio_flags to the passed in flags. Link: http://lkml.kernel.org/r/20170127172328.18574-1-l.stach@pengutronix.deSigned-off-by:
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Mike Rapoport authored
Add documentation about new userfaultfd features and events Link: http://lkml.kernel.org/r/1487716431-5551-1-git-send-email-rppt@linux.vnet.ibm.comSigned-off-by:
Mike Rapoport <rppt@linux.vnet.ibm.com> Reviewed-by:
Andrea Arcangeli <aarcange@redhat.com> Cc: "Dr. David Alan Gilbert" <dgilbert@redhat.com> Cc: Hillf Danton <hillf.zj@alibaba-inc.com> Cc: Mike Kravetz <mike.kravetz@oracle.com> Cc: Pavel Emelyanov <xemul@virtuozzo.com> Signed-off-by:
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Mike Rapoport authored
In the non-cooperative userfaultfd case, the process exit may race with outstanding mcopy_atomic called by the uffd monitor. Returning -ENOSPC instead of -EINVAL when mm is already gone will allow uffd monitor to distinguish this case from other error conditions. Link: http://lkml.kernel.org/r/1485542673-24387-6-git-send-email-rppt@linux.vnet.ibm.comSigned-off-by:
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Mike Rapoport authored
The memory mapping of a process may change between #PF event and the call to mcopy_atomic that comes to resolve the page fault. In such case, there will be no VMA covering the range passed to mcopy_atomic or the VMA will not have userfaultfd context. To allow uffd monitor to distinguish those case from other errors, let's return -ENOENT instead of -EINVAL. Note, that despite availability of UFFD_EVENT_UNMAP there still might be race between the processing of UFFD_EVENT_UNMAP and outstanding mcopy_atomic in case of non-cooperative uffd usage. [rppt@linux.vnet.ibm.com: update cases returning -ENOENT] Link: http://lkml.kernel.org/r/20170207150249.GA6709@rapoport-lnx [aarcange@redhat.com: merge fix] [akpm@linux-foundation.org: fix the merge fix] Link: http://lkml.kernel.org/r/1485542673-24387-5-git-send-email-rppt@linux.vnet.ibm.comSigned-off-by:
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Mike Rapoport authored
Allow userfaultfd monitor track termination of the processes that have memory backed by the uffd. [rppt@linux.vnet.ibm.com: add comment] Link: http://lkml.kernel.org/r/20170202135448.GB19804@rapoport-lnxLink: http://lkml.kernel.org/r/1485542673-24387-4-git-send-email-rppt@linux.vnet.ibm.comSigned-off-by:
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Mike Rapoport authored
When a non-cooperative userfaultfd monitor copies pages in the background, it may encounter regions that were already unmapped. Addition of UFFD_EVENT_UNMAP allows the uffd monitor to track precisely changes in the virtual memory layout. Since there might be different uffd contexts for the affected VMAs, we first should create a temporary representation for the unmap event for each uffd context and then notify them one by one to the appropriate userfault file descriptors. The event notification occurs after the mmap_sem has been released. [arnd@arndb.de: fix nommu build] Link: http://lkml.kernel.org/r/20170203165141.3665284-1-arnd@arndb.de [mhocko@suse.com: fix nommu build] Link: http://lkml.kernel.org/r/20170202091503.GA22823@dhcp22.suse.cz Link: http://lkml.kernel.org/r/1485542673-24387-3-git-send-email-rppt@linux.vnet.ibm.comSigned-off-by:
Arnd Bergmann <arnd@arndb.de> Acked-by:
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Mike Rapoport authored
Patch series "userfaultfd: non-cooperative: better tracking for mapping changes", v2. These patches try to address issues I've encountered during integration of userfaultfd with CRIU. Previously added userfaultfd events for fork(), madvise() and mremap() unfortunately do not cover all possible changes to a process virtual memory layout required for uffd monitor. When one or more VMAs is removed from the process mm, the external uffd monitor has no way to detect those changes and will attempt to fill the removed regions with userfaultfd_copy. Another problematic event is the exit() of the process. Here again, the external uffd monitor will try to use userfaultfd_copy, although mm owning the memory has already gone. The first patch in the series is a minor cleanup and it's not strictly related to the rest of the series. The patches 2 and 3 below add UFFD_EVENT_UNMAP and UFFD_EVENT_EXIT to allow the uffd monitor track changes in the memory layout of a process. The patches 4 and 5 amend error codes returned by userfaultfd_copy to make the uffd monitor able to cope with races that might occur between delivery of unmap and exit events and outstanding userfaultfd_copy's. This patch (of 5): Commit dc0ef0df ("mm: make mmap_sem for write waits killable for mm syscalls") replaced call to vm_munmap in munmap syscall with open coded version to allow different waits on mmap_sem in munmap syscall and vm_munmap. Now both functions use down_write_killable, so we can restore the call to vm_munmap from the munmap system call. Link: http://lkml.kernel.org/r/1485542673-24387-2-git-send-email-rppt@linux.vnet.ibm.comSigned-off-by:
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Kirill A. Shutemov authored
remove_migration_pte() also can easily be converted to page_vma_mapped_walk(). [akpm@linux-foundation.org: coding-style fixes] Link: http://lkml.kernel.org/r/20170129173858.45174-13-kirill.shutemov@linux.intel.comSigned-off-by:
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Kirill A. Shutemov authored
All users are gone. Let's drop them. Link: http://lkml.kernel.org/r/20170129173858.45174-12-kirill.shutemov@linux.intel.comSigned-off-by:
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Kirill A. Shutemov authored
For consistency, it worth converting all page_check_address() to page_vma_mapped_walk(), so we could drop the former. Link: http://lkml.kernel.org/r/20170129173858.45174-11-kirill.shutemov@linux.intel.comSigned-off-by:
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Kirill A. Shutemov authored
For consistency, it worth converting all page_check_address() to page_vma_mapped_walk(), so we could drop the former. Link: http://lkml.kernel.org/r/20170129173858.45174-10-kirill.shutemov@linux.intel.comSigned-off-by:
Srikar Dronamraju <srikar@linux.vnet.ibm.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Hillf Danton <hillf.zj@alibaba-inc.com> Cc: Hugh Dickins <hughd@google.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rik van Riel <riel@redhat.com> Cc: Vladimir Davydov <vdavydov.dev@gmail.com> Signed-off-by:
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Kirill A. Shutemov authored
For consistency, it worth converting all page_check_address() to page_vma_mapped_walk(), so we could drop the former. Link: http://lkml.kernel.org/r/20170129173858.45174-9-kirill.shutemov@linux.intel.comSigned-off-by:
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Kirill A. Shutemov authored
For consistency, it worth converting all page_check_address() to page_vma_mapped_walk(), so we could drop the former. It also makes freeze_page() as we walk though rmap only once. Link: http://lkml.kernel.org/r/20170129173858.45174-8-kirill.shutemov@linux.intel.comSigned-off-by:
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Kirill A. Shutemov authored
For consistency, it worth converting all page_check_address() to page_vma_mapped_walk(), so we could drop the former. PMD handling here is future-proofing, we don't have users yet. ext4 with huge pages will be the first. Link: http://lkml.kernel.org/r/20170129173858.45174-7-kirill.shutemov@linux.intel.comSigned-off-by:
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Kirill A. Shutemov authored
Current rmap code can miss a VMA that maps PTE-mapped THP if the first suppage of the THP was unmapped from the VMA. We need to walk rmap for the whole range of offsets that THP covers, not only the first one. vma_address() also need to be corrected to check the range instead of the first subpage. Link: http://lkml.kernel.org/r/20170129173858.45174-6-kirill.shutemov@linux.intel.comSigned-off-by:
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Kirill A. Shutemov authored
For PTE-mapped THP page_check_address_transhuge() is not adequate: it cannot find all relevant PTEs, only the first one.i Let's switch it to page_vma_mapped_walk(). I don't think it's subject for stable@: it's not fatal. Link: http://lkml.kernel.org/r/20170129173858.45174-5-kirill.shutemov@linux.intel.comSigned-off-by:
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Kirill A. Shutemov authored
For PTE-mapped THP page_check_address_transhuge() is not adequate: it cannot find all relevant PTEs, only the first one. It means we can miss some references of the page and it can result in suboptimal decisions by vmscan. Let's switch it to page_vma_mapped_walk(). I don't think it's subject for stable@: it's not fatal. The only side effect is that THP can be swapped out when it shouldn't. Link: http://lkml.kernel.org/r/20170129173858.45174-4-kirill.shutemov@linux.intel.comSigned-off-by:
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Kirill A. Shutemov authored
Introduce a new interface to check if a page is mapped into a vma. It aims to address shortcomings of page_check_address{,_transhuge}. Existing interface is not able to handle PTE-mapped THPs: it only finds the first PTE. The rest lefted unnoticed. page_vma_mapped_walk() iterates over all possible mapping of the page in the vma. Link: http://lkml.kernel.org/r/20170129173858.45174-3-kirill.shutemov@linux.intel.comSigned-off-by: -
Kirill A. Shutemov authored
Patch series "Fix few rmap-related THP bugs", v3. The patchset fixes handing PTE-mapped THPs in page_referenced() and page_idle_clear_pte_refs(). To achieve that I've intrdocued new helper -- page_vma_mapped_walk() -- which replaces all page_check_address{,_transhuge}() and covers all THP cases. Patchset overview: - First patch fixes one uprobe bug (unrelated to the rest of the patchset, just spotted it at the same time); - Patches 2-5 fix handling PTE-mapped THPs in page_referenced(), page_idle_clear_pte_refs() and rmap core; - Patches 6-12 convert all page_check_address{,_transhuge}() users (plus remove_migration_pte()) to page_vma_mapped_walk() and drop unused helpers. I think the fixes are not critical enough for stable@ as they don't lead to crashes or hangs, only suboptimal behaviour. This patch (of 12): For THPs page_check_address() always fails. It leads to endless loop in uprobe_write_opcode(). Testcase with huge-tmpfs (uprobes cannot probe anonymous memory). mount -t debugfs none /sys/kernel/debug mount -t tmpfs -o huge=always none /mnt gcc -Wall -O2 -o /mnt/test -x c - <<EOF int main(void) { return 0; } /* Padding to map the code segment with huge pmd */ asm (".zero 2097152"); EOF echo 'p /mnt/test:0' > /sys/kernel/debug/tracing/uprobe_events echo 1 > /sys/kernel/debug/tracing/events/uprobes/enable /mnt/test Let's split THPs before trying to replace. Link: http://lkml.kernel.org/r/20170129173858.45174-2-kirill.shutemov@linux.intel.comSigned-off-by: -
Yisheng Xie authored
We had considered all of the non-lru pages as unmovable before commit bda807d4 ("mm: migrate: support non-lru movable page migration"). But now some of non-lru pages like zsmalloc, virtio-balloon pages also become movable. So we can offline such blocks by using non-lru page migration. This patch straightforwardly adds non-lru migration code, which means adding non-lru related code to the functions which scan over pfn and collect pages to be migrated and isolate them before migration. Signed-off-by:
Yisheng Xie <xieyisheng1@huawei.com> Cc: Michal Hocko <mhocko@kernel.org> Cc: Minchan Kim <minchan@kernel.org> Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Andi Kleen <ak@linux.intel.com> Cc: Hanjun Guo <guohanjun@huawei.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Mel Gorman <mgorman@techsingularity.net> Cc: Reza Arbab <arbab@linux.vnet.ibm.com> Cc: Taku Izumi <izumi.taku@jp.fujitsu.com> Cc: Vitaly Kuznetsov <vkuznets@redhat.com> Cc: Xishi Qiu <qiuxishi@huawei.com> Cc: Yisheng Xie <xieyisheng1@huawei.com> Signed-off-by:
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Yisheng Xie authored
Extend soft offlining framework to support non-lru page, which already support migration after commit bda807d4 ("mm: migrate: support non-lru movable page migration") When memory corrected errors occur on a non-lru movable page, we can choose to stop using it by migrating data onto another page and disable the original (maybe half-broken) one. Link: http://lkml.kernel.org/r/1485867981-16037-4-git-send-email-ysxie@foxmail.comSigned-off-by:
Michal Hocko <mhocko@kernel.org> Suggested-by:
Minchan Kim <minchan@kernel.org> Reviewed-by:
Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Andi Kleen <ak@linux.intel.com> Cc: Hanjun Guo <guohanjun@huawei.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Mel Gorman <mgorman@techsingularity.net> Cc: Reza Arbab <arbab@linux.vnet.ibm.com> Cc: Taku Izumi <izumi.taku@jp.fujitsu.com> Cc: Vitaly Kuznetsov <vkuznets@redhat.com> Cc: Xishi Qiu <qiuxishi@huawei.com> Signed-off-by:
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Yisheng Xie authored
Define isolate_movable_page as a static inline function when CONFIG_MIGRATION is not enable. It should return -EBUSY here which means failed to isolate movable pages. This patch do not have any functional change but prepare for later patch. Link: http://lkml.kernel.org/r/1485867981-16037-3-git-send-email-ysxie@foxmail.comSigned-off-by:
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Yisheng Xie authored
Patch series "HWPOISON: soft offlining for non-lru movable page", v6. After Minchan's commit bda807d4 ("mm: migrate: support non-lru movable page migration"), some type of non-lru page like zsmalloc and virtio-balloon page also support migration. Therefore, we can: 1) soft offlining no-lru movable pages, which means when memory corrected errors occur on a non-lru movable page, we can stop to use it by migrating data onto another page and disable the original (maybe half-broken) one. 2) enable memory hotplug for non-lru movable pages, i.e. we may offline blocks, which include such pages, by using non-lru page migration. This patchset is heavily dependent on non-lru movable page migration. This patch (of 4): Change the return type of isolate_movable_page() from bool to int. It will return 0 when isolate movable page successfully, and return -EBUSY when it isolates failed. There is no functional change within this patch but prepare for later patch. [xieyisheng1@huawei.com: v6] Link: http://lkml.kernel.org/r/1486108770-630-2-git-send-email-xieyisheng1@huawei.com Link: http://lkml.kernel.org/r/1485867981-16037-2-git-send-email-ysxie@foxmail.comSigned-off-by:
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Vitaly Wool authored
With both coming and already present locking optimizations, introducing kref to reference-count z3fold objects is the right thing to do. Moreover, it makes buddied list no longer necessary, and allows for a simpler handling of headless pages. [akpm@linux-foundation.org: coding-style fixes] Link: http://lkml.kernel.org/r/20170131214650.8ea78033d91ded233f552bc0@gmail.comSigned-off-by:
Vitaly Wool <vitalywool@gmail.com> Reviewed-by:
Dan Streetman <ddstreet@ieee.org> Signed-off-by:
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Vitaly Wool authored
Most of z3fold operations are in-page, such as modifying z3fold page header or moving z3fold objects within a page. Taking per-pool spinlock to protect per-page objects is therefore suboptimal, and the idea of having a per-page spinlock (or rwlock) has been around for some time. This patch implements spinlock-based per-page locking mechanism which is lightweight enough to normally fit ok into the z3fold header. Link: http://lkml.kernel.org/r/20170131214438.433e0a5fda908337b63206d3@gmail.comSigned-off-by:
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Vitaly Wool authored
z3fold_compact_page() currently only handles the situation when there's a single middle chunk within the z3fold page. However it may be worth it to move middle chunk closer to either first or last chunk, whichever is there, if the gap between them is big enough. This patch adds the relevant code, using BIG_CHUNK_GAP define as a threshold for middle chunk to be worth moving. Link: http://lkml.kernel.org/r/20170131214334.c4f3eac9a477af0fa9a22c46@gmail.comSigned-off-by:
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