mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2026-04-14 18:29:12 +08:00
41d88484c7
Change of attributes of the pages may lead to fragmentation of direct mapping over time and performance degradation when these pages contain executable code. With current code it's one way road: kernel tries to avoid splitting large pages, but it doesn't restore them back even if page attributes got compatible again. Any change to the mapping may potentially allow to restore large page. Add a hook to cpa_flush() path that will check if the pages in the range that were just touched can be mapped at PMD level. If the collapse at the PMD level succeeded, also attempt to collapse PUD level. The collapse logic runs only when a set_memory_ method explicitly sets CPA_COLLAPSE flag, for now this is only enabled in set_memory_rox(). CPUs don't like[1] to have to have TLB entries of different size for the same memory, but looks like it's okay as long as these entries have matching attributes[2]. Therefore it's critical to flush TLB before any following changes to the mapping. Note that we already allow for multiple TLB entries of different sizes for the same memory now in split_large_page() path. It's not a new situation. set_memory_4k() provides a way to use 4k pages on purpose. Kernel must not remap such pages as large. Re-use one of software PTE bits to indicate such pages. [1] See Erratum 383 of AMD Family 10h Processors [2] https://lore.kernel.org/linux-mm/1da1b025-cabc-6f04-bde5-e50830d1ecf0@amd.com/ [rppt@kernel.org: * s/restore/collapse/ * update formatting per peterz * use 'struct ptdesc' instead of 'struct page' for list of page tables to be freed * try to collapse PMD first and if it succeeds move on to PUD as peterz suggested * flush TLB twice: for changes done in the original CPA call and after collapsing of large pages * update commit message ] Signed-off-by: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Co-developed-by: "Mike Rapoport (Microsoft)" <rppt@kernel.org> Signed-off-by: "Mike Rapoport (Microsoft)" <rppt@kernel.org> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lore.kernel.org/r/20250126074733.1384926-4-rppt@kernel.org
198 lines
4.3 KiB
C
198 lines
4.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef VM_EVENT_ITEM_H_INCLUDED
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#define VM_EVENT_ITEM_H_INCLUDED
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#ifdef CONFIG_ZONE_DMA
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#define DMA_ZONE(xx) xx##_DMA,
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#else
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#define DMA_ZONE(xx)
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#endif
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#ifdef CONFIG_ZONE_DMA32
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#define DMA32_ZONE(xx) xx##_DMA32,
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#else
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#define DMA32_ZONE(xx)
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#endif
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#ifdef CONFIG_HIGHMEM
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#define HIGHMEM_ZONE(xx) xx##_HIGH,
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#else
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#define HIGHMEM_ZONE(xx)
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#endif
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#ifdef CONFIG_ZONE_DEVICE
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#define DEVICE_ZONE(xx) xx##_DEVICE,
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#else
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#define DEVICE_ZONE(xx)
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#endif
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#define FOR_ALL_ZONES(xx) DMA_ZONE(xx) DMA32_ZONE(xx) xx##_NORMAL, \
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HIGHMEM_ZONE(xx) xx##_MOVABLE, DEVICE_ZONE(xx)
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enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT,
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FOR_ALL_ZONES(PGALLOC)
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FOR_ALL_ZONES(ALLOCSTALL)
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FOR_ALL_ZONES(PGSCAN_SKIP)
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PGFREE, PGACTIVATE, PGDEACTIVATE, PGLAZYFREE,
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PGFAULT, PGMAJFAULT,
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PGLAZYFREED,
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PGREFILL,
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PGREUSE,
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PGSTEAL_KSWAPD,
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PGSTEAL_DIRECT,
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PGSTEAL_KHUGEPAGED,
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PGSCAN_KSWAPD,
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PGSCAN_DIRECT,
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PGSCAN_KHUGEPAGED,
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PGSCAN_DIRECT_THROTTLE,
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PGSCAN_ANON,
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PGSCAN_FILE,
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PGSTEAL_ANON,
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PGSTEAL_FILE,
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#ifdef CONFIG_NUMA
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PGSCAN_ZONE_RECLAIM_SUCCESS,
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PGSCAN_ZONE_RECLAIM_FAILED,
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#endif
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PGINODESTEAL, SLABS_SCANNED, KSWAPD_INODESTEAL,
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KSWAPD_LOW_WMARK_HIT_QUICKLY, KSWAPD_HIGH_WMARK_HIT_QUICKLY,
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PAGEOUTRUN, PGROTATED,
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DROP_PAGECACHE, DROP_SLAB,
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OOM_KILL,
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#ifdef CONFIG_NUMA_BALANCING
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NUMA_PTE_UPDATES,
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NUMA_HUGE_PTE_UPDATES,
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NUMA_HINT_FAULTS,
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NUMA_HINT_FAULTS_LOCAL,
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NUMA_PAGE_MIGRATE,
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#endif
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#ifdef CONFIG_MIGRATION
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PGMIGRATE_SUCCESS, PGMIGRATE_FAIL,
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THP_MIGRATION_SUCCESS,
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THP_MIGRATION_FAIL,
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THP_MIGRATION_SPLIT,
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#endif
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#ifdef CONFIG_COMPACTION
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COMPACTMIGRATE_SCANNED, COMPACTFREE_SCANNED,
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COMPACTISOLATED,
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COMPACTSTALL, COMPACTFAIL, COMPACTSUCCESS,
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KCOMPACTD_WAKE,
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KCOMPACTD_MIGRATE_SCANNED, KCOMPACTD_FREE_SCANNED,
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#endif
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#ifdef CONFIG_HUGETLB_PAGE
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HTLB_BUDDY_PGALLOC, HTLB_BUDDY_PGALLOC_FAIL,
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#endif
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#ifdef CONFIG_CMA
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CMA_ALLOC_SUCCESS,
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CMA_ALLOC_FAIL,
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#endif
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UNEVICTABLE_PGCULLED, /* culled to noreclaim list */
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UNEVICTABLE_PGSCANNED, /* scanned for reclaimability */
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UNEVICTABLE_PGRESCUED, /* rescued from noreclaim list */
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UNEVICTABLE_PGMLOCKED,
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UNEVICTABLE_PGMUNLOCKED,
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UNEVICTABLE_PGCLEARED, /* on COW, page truncate */
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UNEVICTABLE_PGSTRANDED, /* unable to isolate on unlock */
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE
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THP_FAULT_ALLOC,
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THP_FAULT_FALLBACK,
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THP_FAULT_FALLBACK_CHARGE,
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THP_COLLAPSE_ALLOC,
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THP_COLLAPSE_ALLOC_FAILED,
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THP_FILE_ALLOC,
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THP_FILE_FALLBACK,
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THP_FILE_FALLBACK_CHARGE,
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THP_FILE_MAPPED,
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THP_SPLIT_PAGE,
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THP_SPLIT_PAGE_FAILED,
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THP_DEFERRED_SPLIT_PAGE,
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THP_UNDERUSED_SPLIT_PAGE,
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THP_SPLIT_PMD,
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THP_SCAN_EXCEED_NONE_PTE,
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THP_SCAN_EXCEED_SWAP_PTE,
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THP_SCAN_EXCEED_SHARED_PTE,
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#ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
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THP_SPLIT_PUD,
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#endif
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THP_ZERO_PAGE_ALLOC,
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THP_ZERO_PAGE_ALLOC_FAILED,
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THP_SWPOUT,
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THP_SWPOUT_FALLBACK,
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#endif
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#ifdef CONFIG_MEMORY_BALLOON
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BALLOON_INFLATE,
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BALLOON_DEFLATE,
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#ifdef CONFIG_BALLOON_COMPACTION
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BALLOON_MIGRATE,
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#endif
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#endif
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#ifdef CONFIG_DEBUG_TLBFLUSH
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NR_TLB_REMOTE_FLUSH, /* cpu tried to flush others' tlbs */
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NR_TLB_REMOTE_FLUSH_RECEIVED,/* cpu received ipi for flush */
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NR_TLB_LOCAL_FLUSH_ALL,
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NR_TLB_LOCAL_FLUSH_ONE,
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#endif /* CONFIG_DEBUG_TLBFLUSH */
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#ifdef CONFIG_SWAP
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SWAP_RA,
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SWAP_RA_HIT,
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SWPIN_ZERO,
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SWPOUT_ZERO,
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#ifdef CONFIG_KSM
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KSM_SWPIN_COPY,
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#endif
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#endif
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#ifdef CONFIG_KSM
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COW_KSM,
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#endif
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#ifdef CONFIG_ZSWAP
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ZSWPIN,
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ZSWPOUT,
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ZSWPWB,
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#endif
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#ifdef CONFIG_X86
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DIRECT_MAP_LEVEL2_SPLIT,
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DIRECT_MAP_LEVEL3_SPLIT,
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DIRECT_MAP_LEVEL2_COLLAPSE,
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DIRECT_MAP_LEVEL3_COLLAPSE,
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#endif
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#ifdef CONFIG_PER_VMA_LOCK_STATS
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VMA_LOCK_SUCCESS,
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VMA_LOCK_ABORT,
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VMA_LOCK_RETRY,
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VMA_LOCK_MISS,
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#endif
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#ifdef CONFIG_DEBUG_STACK_USAGE
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KSTACK_1K,
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#if THREAD_SIZE > 1024
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KSTACK_2K,
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#endif
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#if THREAD_SIZE > 2048
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KSTACK_4K,
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#endif
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#if THREAD_SIZE > 4096
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KSTACK_8K,
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#endif
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#if THREAD_SIZE > 8192
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KSTACK_16K,
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#endif
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#if THREAD_SIZE > 16384
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KSTACK_32K,
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#endif
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#if THREAD_SIZE > 32768
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KSTACK_64K,
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#endif
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#if THREAD_SIZE > 65536
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KSTACK_REST,
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#endif
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#endif /* CONFIG_DEBUG_STACK_USAGE */
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NR_VM_EVENT_ITEMS
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};
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#ifndef CONFIG_TRANSPARENT_HUGEPAGE
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#define THP_FILE_ALLOC ({ BUILD_BUG(); 0; })
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#define THP_FILE_FALLBACK ({ BUILD_BUG(); 0; })
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#define THP_FILE_FALLBACK_CHARGE ({ BUILD_BUG(); 0; })
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#define THP_FILE_MAPPED ({ BUILD_BUG(); 0; })
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#endif
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#endif /* VM_EVENT_ITEM_H_INCLUDED */
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