- 16 Oct, 2020 40 commits
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Oscar Salvador authored
Place the THP's page handling in a helper and use it from both hard and soft-offline machinery, so we get rid of some duplicated code. Signed-off-by:
Oscar Salvador <osalvador@suse.de> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Acked-by:
Naoya Horiguchi <naoya.horiguchi@nec.com> Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com> Cc: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Cc: Aristeu Rozanski <aris@ruivo.org> Cc: Dave Hansen <dave.hansen@intel.com> Cc: David Hildenbrand <david@redhat.com> Cc: Dmitry Yakunin <zeil@yandex-team.ru> Cc: Michal Hocko <mhocko@kernel.org> Cc: Mike Kravetz <mike.kravetz@oracle.com> Cc: Oscar Salvador <osalvador@suse.com> Cc: Qian Cai <cai@lca.pw> Cc: Tony Luck <tony.luck@intel.com> Link: https://lkml.kernel.org/r/20200922135650.1634-8-osalvador@suse.deSigned-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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Oscar Salvador authored
After commit 4e41a30c ("mm: hwpoison: adjust for new thp refcounting"), put_hwpoison_page got reduced to a put_page. Let us just use put_page instead. Signed-off-by:
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Oscar Salvador authored
Make a proper if-else condition for {hard,soft}-offline. Signed-off-by:Oscar Salvador <osalvador@suse.com> Signed-off-by:
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Oscar Salvador authored
Since get_hwpoison_page is only used in memory-failure code now, let us un-export it and make it private to that code. Signed-off-by:
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Naoya Horiguchi authored
Another memory error injection interface debugfs:hwpoison/corrupt-pfn also takes bogus refcount for hwpoison_filter(). It's justified because this does a coarse filter, expecting that memory_failure() redoes the check for sure. Signed-off-by:
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Naoya Horiguchi authored
hpage is never used after try_to_split_thp_page() in memory_failure(), so we don't have to update hpage. So let's not recalculate/use hpage. Suggested-by:
"Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com> Signed-off-by:
Mike Kravetz <mike.kravetz@oracle.com> Cc: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Cc: Aristeu Rozanski <aris@ruivo.org> Cc: Dave Hansen <dave.hansen@intel.com> Cc: David Hildenbrand <david@redhat.com> Cc: Dmitry Yakunin <zeil@yandex-team.ru> Cc: Michal Hocko <mhocko@kernel.org> Cc: Oscar Salvador <osalvador@suse.com> Cc: Qian Cai <cai@lca.pw> Cc: Tony Luck <tony.luck@intel.com> Link: https://lkml.kernel.org/r/20200922135650.1634-3-osalvador@suse.deSigned-off-by:
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Naoya Horiguchi authored
Patch series "HWPOISON: soft offline rework", v7. This patchset fixes a couple of issues that the patchset Naoya sent [1] contained due to rebasing problems and a misunterdansting. Main focus of this series is to stabilize soft offline. Historically soft offlined pages have suffered from racy conditions because PageHWPoison is used to a little too aggressively, which (directly or indirectly) invades other mm code which cares little about hwpoison. This results in unexpected behavior or kernel panic, which is very far from soft offline's "do not disturb userspace or other kernel component" policy. An example of this can be found here [2]. Along with several cleanups, this code refactors and changes the way soft offline work. Main point of this change set is to contain target page "via buddy allocator" or in migrating path. For ther former we first free the target page as we do for normal pages, and once it has reached buddy and it has been taken off the freelists, we flag it as HWpoison. For the latter we never get to release the page in unmap_and_move, so the page is under our control and we can handle it in hwpoison code. [1] https://patchwork.kernel.org/cover/11704083/ [2] https://lore.kernel.org/linux-mm/20190826104144.GA7849@linux/T/#u This patch (of 14): Drop the PageHuge check, which is dead code since memory_failure() forks into memory_failure_hugetlb() for hugetlb pages. memory_failure() and memory_failure_hugetlb() shares some functions like hwpoison_user_mappings() and identify_page_state(), so they should properly handle 4kB page, thp, and hugetlb. Signed-off-by:
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David Howells authored
The file_ra_state being passed into page_cache_sync_readahead() was being ignored in favour of using the one embedded in the struct file. The only caller for which this makes a difference is the fsverity code if the file has been marked as POSIX_FADV_RANDOM, but it's confusing and worth fixing. Signed-off-by:
David Howells <dhowells@redhat.com> Signed-off-by:
Matthew Wilcox (Oracle) <willy@infradead.org> Signed-off-by:
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David Howells authored
Fold ra_submit() into its last remaining user and pass the readahead_control struct to both do_page_cache_ra() and page_cache_sync_ra(). Signed-off-by:
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Matthew Wilcox (Oracle) authored
Reimplement page_cache_sync_readahead() and page_cache_async_readahead() as wrappers around versions of the function which take a readahead_control in preparation for making do_sync_mmap_readahead() pass down an RAC struct. Signed-off-by:
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David Howells authored
Reimplement force_page_cache_readahead() as a wrapper around force_page_cache_ra(). Pass the existing readahead_control from page_cache_sync_readahead(). Signed-off-by:
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David Howells authored
Make ondemand_readahead() take a readahead_control struct in preparation for making do_sync_mmap_readahead() pass down an RAC struct. Signed-off-by:
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Matthew Wilcox (Oracle) authored
Rename __do_page_cache_readahead() to do_page_cache_ra() and call it directly from ondemand_readahead() instead of indirecting via ra_submit(). Signed-off-by:
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Matthew Wilcox (Oracle) authored
Define it in the callers instead of in page_cache_ra_unbounded(). Signed-off-by:
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Matthew Wilcox (Oracle) authored
Patch series "Readahead patches for 5.9/5.10". These are infrastructure for both the THP patchset and for the fscache rewrite, For both pieces of infrastructure being build on top of this patchset, we want the ractl to be available higher in the call-stack. For David's work, he wants to add the 'critical page' to the ractl so that he knows which page NEEDS to be brought in from storage, and which ones are nice-to-have. We might want something similar in block storage too. It used to be simple -- the first page was the critical one, but then mmap added fault-around and so for that usecase, the middle page is the critical one. Anyway, I don't have any code to show that yet, we just know that the lowest point in the callchain where we have that information is do_sync_mmap_readahead() and so the ractl needs to start its life there. For THP, we havew the code that needs it. It's actually the apex patch to the series; the one which finally starts to allocate THPs and present them to consenting filesystems: http://git.infradead.org/users/willy/pagecache.git/commitdiff/798bcf30ab2eff278caad03a9edca74d2f8ae760 This patch (of 8): Allow for a more concise definition of a struct readahead_control. Signed-off-by:
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Huang Ying authored
It is reported that the following bug is triggered if the HDD is used as swap device, [ 5758.157556] BUG: kernel NULL pointer dereference, address: 0000000000000007 [ 5758.165331] #PF: supervisor write access in kernel mode [ 5758.171161] #PF: error_code(0x0002) - not-present page [ 5758.176894] PGD 0 P4D 0 [ 5758.179721] Oops: 0002 [#1] SMP PTI [ 5758.183614] CPU: 10 PID: 316 Comm: kswapd1 Kdump: loaded Tainted: G S --------- --- 5.9.0-0.rc3.1.tst.el8.x86_64 #1 [ 5758.196717] Hardware name: Intel Corporation S2600CP/S2600CP, BIOS SE5C600.86B.02.01.0002.082220131453 08/22/2013 [ 5758.208176] RIP: 0010:split_swap_cluster+0x47/0x60 [ 5758.213522] Code: c1 e3 06 48 c1 eb 0f 48 8d 1c d8 48 89 df e8 d0 20 6a 00 80 63 07 fb 48 85 db 74 16 48 89 df c6 07 00 66 66 66 90 31 c0 5b c3 <80> 24 25 07 00 00 00 fb 31 c0 5b c3 b8 f0 ff ff ff 5b c3 66 0f 1f [ 5758.234478] RSP: 0018:ffffb147442d7af0 EFLAGS: 00010246 [ 5758.240309] RAX: 0000000000000000 RBX: 000000000014b217 RCX: ffffb14779fd9000 [ 5758.248281] RDX: 000000000014b217 RSI: ffff9c52f2ab1400 RDI: 000000000014b217 [ 5758.256246] RBP: ffffe00c51168080 R08: ffffe00c5116fe08 R09: ffff9c52fffd3000 [ 5758.264208] R10: ffffe00c511537c8 R11: ffff9c52fffd3c90 R12: 0000000000000000 [ 5758.272172] R13: ffffe00c51170000 R14: ffffe00c51170000 R15: ffffe00c51168040 [ 5758.280134] FS: 0000000000000000(0000) GS:ffff9c52f2a80000(0000) knlGS:0000000000000000 [ 5758.289163] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 5758.295575] CR2: 0000000000000007 CR3: 0000000022a0e003 CR4: 00000000000606e0 [ 5758.303538] Call Trace: [ 5758.306273] split_huge_page_to_list+0x88b/0x950 [ 5758.311433] deferred_split_scan+0x1ca/0x310 [ 5758.316202] do_shrink_slab+0x12c/0x2a0 [ 5758.320491] shrink_slab+0x20f/0x2c0 [ 5758.324482] shrink_node+0x240/0x6c0 [ 5758.328469] balance_pgdat+0x2d1/0x550 [ 5758.332652] kswapd+0x201/0x3c0 [ 5758.336157] ? finish_wait+0x80/0x80 [ 5758.340147] ? balance_pgdat+0x550/0x550 [ 5758.344525] kthread+0x114/0x130 [ 5758.348126] ? kthread_park+0x80/0x80 [ 5758.352214] ret_from_fork+0x22/0x30 [ 5758.356203] Modules linked in: fuse zram rfkill sunrpc intel_rapl_msr intel_rapl_common sb_edac x86_pkg_temp_thermal intel_powerclamp coretemp mgag200 iTCO_wdt crct10dif_pclmul iTCO_vendor_support drm_kms_helper crc32_pclmul ghash_clmulni_intel syscopyarea sysfillrect sysimgblt fb_sys_fops cec rapl joydev intel_cstate ipmi_si ipmi_devintf drm intel_uncore i2c_i801 ipmi_msghandler pcspkr lpc_ich mei_me i2c_smbus mei ioatdma ip_tables xfs libcrc32c sr_mod sd_mod cdrom t10_pi sg igb ahci libahci i2c_algo_bit crc32c_intel libata dca wmi dm_mirror dm_region_hash dm_log dm_mod [ 5758.412673] CR2: 0000000000000007 [ 0.000000] Linux version 5.9.0-0.rc3.1.tst.el8.x86_64 (mockbuild@x86-vm-15.build.eng.bos.redhat.com) (gcc (GCC) 8.3.1 20191121 (Red Hat 8.3.1-5), GNU ld version 2.30-79.el8) #1 SMP Wed Sep 9 16:03:34 EDT 2020 After further digging it's found that the following race condition exists in the original implementation, CPU1 CPU2 ---- ---- deferred_split_scan() split_huge_page(page) /* page isn't compound head */ split_huge_page_to_list(page, NULL) __split_huge_page(page, ) ClearPageCompound(head) /* unlock all subpages except page (not head) */ add_to_swap(head) /* not THP */ get_swap_page(head) add_to_swap_cache(head, ) SetPageSwapCache(head) if PageSwapCache(head) split_swap_cluster(/* swap entry of head */) /* Deref sis->cluster_info: NULL accessing! */ So, in split_huge_page_to_list(), PageSwapCache() is called for the already split and unlocked "head", which may be added to swap cache in another CPU. So split_swap_cluster() may be called wrongly. To fix the race, the call to split_swap_cluster() is moved to __split_huge_page() before all subpages are unlocked. So that the PageSwapCache() is stable. Fixes: 59807685 ("mm, THP, swap: support splitting THP for THP swap out") Reported-by:Rafael Aquini <aquini@redhat.com> Signed-off-by:
"Huang, Ying" <ying.huang@intel.com> Signed-off-by:
Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Hugh Dickins <hughd@google.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Matthew Wilcox <willy@infradead.org> Link: https://lkml.kernel.org/r/20201009073647.1531083-1-ying.huang@intel.comSigned-off-by:
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Matthew Wilcox (Oracle) authored
The nr_thps counter is to support THPs in the page cache when the filesystem doesn't understand THPs. Eventually it will be removed, but we should still support filesystems which do not understand THPs yet. Move the nr_thp manipulation functions to filemap.h since they're page-cache specific. Signed-off-by:
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Matthew Wilcox (Oracle) authored
The page cache needs to know whether the filesystem supports THPs so that it doesn't send THPs to filesystems which can't handle them. Dave Chinner points out that getting from the page mapping to the filesystem type is too many steps (mapping->host->i_sb->s_type->fs_flags) so cache that information in the address space flags. Signed-off-by:
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Matthew Wilcox (Oracle) authored
Remove the assumption that a compound page has HPAGE_PMD_NR pins from the page cache. Signed-off-by:
SeongJae Park <sjpark@amazon.de> Acked-by:
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Matthew Wilcox (Oracle) authored
page->mapping is undefined for tail pages, so operate exclusively on the head page. Signed-off-by:
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Matthew Wilcox (Oracle) authored
Remove the assumption that a compound page is HPAGE_PMD_SIZE, and the assumption that any page is PAGE_SIZE. Signed-off-by:
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Matthew Wilcox (Oracle) authored
Ask the page what size it is instead of assuming it's PMD size. Do this for anon pages as well as file pages for when someone decides to support that. Leave the assumption alone for pages which are PMD mapped; we don't currently grow THPs beyond PMD size, so we don't need to change this code yet. Signed-off-by:
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Matthew Wilcox (Oracle) authored
Ask the page how many subpages it has instead of assuming it's PMD size. Signed-off-by:
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Matthew Wilcox (Oracle) authored
Ask the page what size it is instead of assuming it's PMD size. Signed-off-by:
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Kirill A. Shutemov authored
File THPs may now be of arbitrary size, and we can't rely on that size after doing the split so remember the number of pages before we start the split. Signed-off-by:
Kirill A. Shutemov <kirill@shutemov.name> Signed-off-by:
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Kirill A. Shutemov authored
File THPs may now be of arbitrary order. Signed-off-by:
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Matthew Wilcox (Oracle) authored
The implementation of split_page_owner() prefers a count rather than the old order of the page. When we support a variable size THP, we won't have the order at this point, but we will have the number of pages. So change the interface to what the caller and callee would prefer. Signed-off-by:
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Matthew Wilcox (Oracle) authored
A compound page in the page cache will not necessarily be of PMD size, so check explicitly. [willy@infradead.org: fix remove page fault assumption of compound page size] Link: https://lkml.kernel.org/r/20201001152259.14932-1-willy@infradead.orgSigned-off-by:
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Matthew Wilcox (Oracle) authored
Patch series "Remove assumptions of THP size". There are a number of places in the VM which assume that a THP is a PMD in size. That's true today, and remains true after this patch series, but this is a prerequisite for switching to arbitrary-sized THPs. thp_nr_pages() still returns either HPAGE_PMD_NR or 1, but will be changed later. This patch (of 11): page_cache_free_page() assumes THPs are PMD_SIZE; fix that assumption. Signed-off-by:
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Matthew Wilcox (Oracle) authored
When a THP is removed from the page cache by reclaim, we replace it with a shadow entry that occupies all slots of the XArray previously occupied by the THP. If the user then accesses that page again, we only allocate a single page, but storing it into the shadow entry replaces all entries with that one page. That leads to bugs like page dumped because: VM_BUG_ON_PAGE(page_to_pgoff(page) != offset) ------------[ cut here ]------------ kernel BUG at mm/filemap.c:2529! https://bugzilla.kernel.org/show_bug.cgi?id=206569 This is hard to reproduce with mainline, but happens regularly with the THP patchset (as so many more THPs are created). This solution is take from the THP patchset. It splits the shadow entry into order-0 pieces at the time that we bring a new page into cache. Fixes: 99cb0dbd ("mm,thp: add read-only THP support for (non-shmem) FS") Signed-off-by:
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Matthew Wilcox (Oracle) authored
In order to use multi-index entries for huge pages in the page cache, we need to be able to split a multi-index entry (eg if a file is truncated in the middle of a huge page entry). This version does not support splitting more than one level of the tree at a time. This is an acceptable limitation for the page cache as we do not expect to support order-12 pages in the near future. [akpm@linux-foundation.org: export xas_split_alloc() to modules] [willy@infradead.org: fix xarray split] Link: https://lkml.kernel.org/r/20200910175450.GV6583@casper.infradead.org [willy@infradead.org: fix xarray] Link: https://lkml.kernel.org/r/20201001233943.GW20115@casper.infradead.orgSigned-off-by:
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Matthew Wilcox (Oracle) authored
Patch series "Fix read-only THP for non-tmpfs filesystems". As described more verbosely in the [3/3] changelog, we can inadvertently put an order-0 page in the page cache which occupies 512 consecutive entries. Users are running into this if they enable the READ_ONLY_THP_FOR_FS config option; see https://bugzilla.kernel.org/show_bug.cgi?id=206569 and Qian Cai has also reported it here: https://lore.kernel.org/lkml/20200616013309.GB815@lca.pw/ This is a rather intrusive way of fixing the problem, but has the advantage that I've actually been testing it with the THP patches, which means that it sees far more use than it does upstream -- indeed, Song has been entirely unable to reproduce it. It also has the advantage that it removes a few patches from my gargantuan backlog of THP patches. This patch (of 3): This function returns the order of the entry at the index. We need this because there isn't space in the shadow entry to encode its order. [akpm@linux-foundation.org: export xa_get_order to modules] Signed-off-by:
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Aneesh Kumar K.V authored
With highmem, pte_alloc_map() keep the level4 page table mapped using kmap_atomic(). Avoid doing new memory allocation with page table mapped like above. [ 9.409233] BUG: sleeping function called from invalid context at mm/page_alloc.c:4822 [ 9.410557] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 1, name: swapper [ 9.411932] no locks held by swapper/1. [ 9.412595] CPU: 0 PID: 1 Comm: swapper Not tainted 5.9.0-rc3-00323-gc50eb1ed654b5 #2 [ 9.413824] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 [ 9.415207] Call Trace: [ 9.415651] ? ___might_sleep.cold+0xa7/0xcc [ 9.416367] ? __alloc_pages_nodemask+0x14c/0x5b0 [ 9.417055] ? swap_migration_tests+0x50/0x293 [ 9.417704] ? debug_vm_pgtable+0x4bc/0x708 [ 9.418287] ? swap_migration_tests+0x293/0x293 [ 9.418911] ? do_one_initcall+0x82/0x3cb [ 9.419465] ? parse_args+0x1bd/0x280 [ 9.419983] ? rcu_read_lock_sched_held+0x36/0x60 [ 9.420673] ? trace_initcall_level+0x1f/0xf3 [ 9.421279] ? trace_initcall_level+0xbd/0xf3 [ 9.421881] ? do_basic_setup+0x9d/0xdd [ 9.422410] ? do_basic_setup+0xc3/0xdd [ 9.422938] ? kernel_init_freeable+0x72/0xa3 [ 9.423539] ? rest_init+0x134/0x134 [ 9.424055] ? kernel_init+0x5/0x12c [ 9.424574] ? ret_from_fork+0x19/0x30 Reported-by:
kernel test robot <lkp@intel.com> Signed-off-by:
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Aneesh Kumar K.V authored
pte_clear_tests operate on an existing pte entry. Make sure that is not a none pte entry. [aneesh.kumar@linux.ibm.com: avoid kernel crash with riscv] Link: https://lkml.kernel.org/r/20201015033206.140550-1-aneesh.kumar@linux.ibm.comSigned-off-by:
Anshuman Khandual <anshuman.khandual@arm.com> Cc: Christophe Leroy <christophe.leroy@csgroup.eu> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Nathan Chancellor <natechancellor@gmail.com> Cc: Guenter Roeck <linux@roeck-us.net> Cc: Paul Walmsley <paul.walmsley@sifive.com> Cc: Albert Ou <aou@eecs.berkeley.edu> Cc: Palmer Dabbelt <palmer@dabbelt.com> Link: https://lkml.kernel.org/r/20200902114222.181353-14-aneesh.kumar@linux.ibm.comSigned-off-by:
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Aneesh Kumar K.V authored
The seems to be missing quite a lot of details w.r.t allocating the correct pgtable_t page (huge_pte_alloc()), holding the right lock (huge_pte_lock()) etc. The vma used is also not a hugetlb VMA. ppc64 do have runtime checks within CONFIG_DEBUG_VM for most of these. Hence disable the test on ppc64. [anshuman.khandual@arm.com: drop hugetlb_advanced_tests()] Link: https://lore.kernel.org/lkml/289c3fdb-1394-c1af-bdc4-5542907089dc@linux.ibm.com/#t Link: https://lkml.kernel.org/r/1600914446-21890-1-git-send-email-anshuman.khandual@arm.comSigned-off-by:
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Aneesh Kumar K.V authored
pmd_clear() should not be used to clear pmd level pte entries. Signed-off-by:
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Aneesh Kumar K.V authored
Architectures like ppc64 use deposited page table while updating the huge pte entries. Signed-off-by:
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Aneesh Kumar K.V authored
Make sure we call pte accessors with correct lock held. Signed-off-by:
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Aneesh Kumar K.V authored
This will help in adding proper locks in a later patch Signed-off-by:
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Aneesh Kumar K.V authored
set_pte_at() should not be used to set a pte entry at locations that already holds a valid pte entry. Architectures like ppc64 don't do TLB invalidate in set_pte_at() and hence expect it to be used to set locations that are not a valid PTE. Link: https://lkml.kernel.org/r/20200902114222.181353-8-aneesh.kumar@linux.ibm.comSigned-off-by:
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