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charset="utf-8" In retract_page_tables(), we may modify the pmd entry after acquiring the pml and ptl, so we should also check whether the pmd entry is stable. Using pte_offset_map_rw_nolock() + pmd_same() to do it, and then we can also remove the calling of the pte_lockptr(). Signed-off-by: Qi Zheng --- mm/khugepaged.c | 17 ++++++++++++++++- 1 file changed, 16 insertions(+), 1 deletion(-) diff --git a/mm/khugepaged.c b/mm/khugepaged.c index 6f8d46d107b4b..6d76dde64f5fb 100644 --- a/mm/khugepaged.c +++ b/mm/khugepaged.c @@ -1721,6 +1721,7 @@ static void retract_page_tables(struct address_space = *mapping, pgoff_t pgoff) spinlock_t *pml; spinlock_t *ptl; bool skipped_uffd =3D false; + pte_t *pte; =20 /* * Check vma->anon_vma to exclude MAP_PRIVATE mappings that @@ -1756,11 +1757,25 @@ static void retract_page_tables(struct address_spac= e *mapping, pgoff_t pgoff) addr, addr + HPAGE_PMD_SIZE); mmu_notifier_invalidate_range_start(&range); =20 + pte =3D pte_offset_map_rw_nolock(mm, pmd, addr, &pgt_pmd, &ptl); + if (!pte) { + mmu_notifier_invalidate_range_end(&range); + continue; + } + pml =3D pmd_lock(mm, pmd); - ptl =3D pte_lockptr(mm, pmd); if (ptl !=3D pml) spin_lock_nested(ptl, SINGLE_DEPTH_NESTING); =20 + if (unlikely(!pmd_same(pgt_pmd, pmdp_get_lockless(pmd)))) { + pte_unmap_unlock(pte, ptl); 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Thu, 31 Oct 2024 01:14:18 -0700 (PDT) From: Qi Zheng To: david@redhat.com, jannh@google.com, hughd@google.com, willy@infradead.org, mgorman@suse.de, muchun.song@linux.dev, vbabka@kernel.org, akpm@linux-foundation.org, zokeefe@google.com, rientjes@google.com, peterx@redhat.com, catalin.marinas@arm.com Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, x86@kernel.org, Qi Zheng Subject: [PATCH v2 2/7] mm: introduce zap_nonpresent_ptes() Date: Thu, 31 Oct 2024 16:13:18 +0800 Message-Id: <34ef26a763af7b2d8dee707b6f60ff85edda345f.1730360798.git.zhengqi.arch@bytedance.com> X-Mailer: git-send-email 2.24.3 (Apple Git-128) In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Similar to zap_present_ptes(), let's introduce zap_nonpresent_ptes() to handle non-present ptes, which can improve code readability. No functional change. Signed-off-by: Qi Zheng Acked-by: David Hildenbrand Reviewed-by: Jann Horn --- mm/memory.c | 136 ++++++++++++++++++++++++++++------------------------ 1 file changed, 73 insertions(+), 63 deletions(-) diff --git a/mm/memory.c b/mm/memory.c index 209885a4134f7..bd9ebe0f4471f 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -1587,6 +1587,76 @@ static inline int zap_present_ptes(struct mmu_gather= *tlb, return 1; } =20 +static inline int zap_nonpresent_ptes(struct mmu_gather *tlb, + struct vm_area_struct *vma, pte_t *pte, pte_t ptent, + unsigned int max_nr, unsigned long addr, + struct zap_details *details, int *rss) +{ + swp_entry_t entry; + int nr =3D 1; + + entry =3D pte_to_swp_entry(ptent); + if (is_device_private_entry(entry) || + is_device_exclusive_entry(entry)) { + struct page *page =3D pfn_swap_entry_to_page(entry); + struct folio *folio =3D page_folio(page); + + if (unlikely(!should_zap_folio(details, folio))) + return 1; + /* + * Both device private/exclusive mappings should only + * work with anonymous page so far, so we don't need to + * consider uffd-wp bit when zap. For more information, + * see zap_install_uffd_wp_if_needed(). + */ + WARN_ON_ONCE(!vma_is_anonymous(vma)); + rss[mm_counter(folio)]--; + if (is_device_private_entry(entry)) + folio_remove_rmap_pte(folio, page, vma); + folio_put(folio); + } else if (!non_swap_entry(entry)) { + /* Genuine swap entries, hence a private anon pages */ + if (!should_zap_cows(details)) + return 1; + + nr =3D swap_pte_batch(pte, max_nr, ptent); + rss[MM_SWAPENTS] -=3D nr; + free_swap_and_cache_nr(entry, nr); + } else if (is_migration_entry(entry)) { + struct folio *folio =3D pfn_swap_entry_folio(entry); + + if (!should_zap_folio(details, folio)) + return 1; + rss[mm_counter(folio)]--; + } else if (pte_marker_entry_uffd_wp(entry)) { + /* + * For anon: always drop the marker; for file: only + * drop the marker if explicitly requested. + */ + if (!vma_is_anonymous(vma) && !zap_drop_markers(details)) + return 1; + } else if (is_guard_swp_entry(entry)) { + /* + * Ordinary zapping should not remove guard PTE + * markers. Only do so if we should remove PTE markers + * in general. + */ + if (!zap_drop_markers(details)) + return 1; + } else if (is_hwpoison_entry(entry) || is_poisoned_swp_entry(entry)) { + if (!should_zap_cows(details)) + return 1; + } else { + /* We should have covered all the swap entry types */ + pr_alert("unrecognized swap entry 0x%lx\n", entry.val); + WARN_ON_ONCE(1); + } + clear_not_present_full_ptes(vma->vm_mm, addr, pte, nr, tlb->fullmm); + zap_install_uffd_wp_if_needed(vma, addr, pte, nr, details, ptent); + + return nr; +} + static unsigned long zap_pte_range(struct mmu_gather *tlb, struct vm_area_struct *vma, pmd_t *pmd, unsigned long addr, unsigned long end, @@ -1598,7 +1668,6 @@ static unsigned long zap_pte_range(struct mmu_gather = *tlb, spinlock_t *ptl; pte_t *start_pte; pte_t *pte; - swp_entry_t entry; int nr; =20 tlb_change_page_size(tlb, PAGE_SIZE); @@ -1611,8 +1680,6 @@ static unsigned long zap_pte_range(struct mmu_gather = *tlb, arch_enter_lazy_mmu_mode(); do { pte_t ptent =3D ptep_get(pte); - struct folio *folio; - struct page *page; int max_nr; =20 nr =3D 1; @@ -1622,8 +1689,8 @@ static unsigned long zap_pte_range(struct mmu_gather = *tlb, if (need_resched()) break; =20 + max_nr =3D (end - addr) / PAGE_SIZE; if (pte_present(ptent)) { - max_nr =3D (end - addr) / PAGE_SIZE; nr =3D zap_present_ptes(tlb, vma, pte, ptent, max_nr, addr, details, rss, &force_flush, &force_break); @@ -1631,67 +1698,10 @@ static unsigned long zap_pte_range(struct mmu_gathe= r *tlb, addr +=3D nr * PAGE_SIZE; break; } - continue; - } - - entry =3D pte_to_swp_entry(ptent); - if (is_device_private_entry(entry) || - is_device_exclusive_entry(entry)) { - page =3D pfn_swap_entry_to_page(entry); - folio =3D page_folio(page); - if (unlikely(!should_zap_folio(details, folio))) - continue; - /* - * Both device private/exclusive mappings should only - * work with anonymous page so far, so we don't need to - * consider uffd-wp bit when zap. For more information, - * see zap_install_uffd_wp_if_needed(). - */ - WARN_ON_ONCE(!vma_is_anonymous(vma)); - rss[mm_counter(folio)]--; - if (is_device_private_entry(entry)) - folio_remove_rmap_pte(folio, page, vma); - folio_put(folio); - } else if (!non_swap_entry(entry)) { - max_nr =3D (end - addr) / PAGE_SIZE; - nr =3D swap_pte_batch(pte, max_nr, ptent); - /* Genuine swap entries, hence a private anon pages */ - if (!should_zap_cows(details)) - continue; - rss[MM_SWAPENTS] -=3D nr; - free_swap_and_cache_nr(entry, nr); - } else if (is_migration_entry(entry)) { - folio =3D pfn_swap_entry_folio(entry); - if (!should_zap_folio(details, folio)) - continue; - rss[mm_counter(folio)]--; - } else if (pte_marker_entry_uffd_wp(entry)) { - /* - * For anon: always drop the marker; for file: only - * drop the marker if explicitly requested. - */ - if (!vma_is_anonymous(vma) && - !zap_drop_markers(details)) - continue; - } else if (is_guard_swp_entry(entry)) { - /* - * Ordinary zapping should not remove guard PTE - * markers. 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charset="utf-8" This commit introduces do_zap_pte_range() to actually zap the PTEs, which will help improve code readability and facilitate secondary checking of the processed PTEs in the future. No functional change. Signed-off-by: Qi Zheng Acked-by: David Hildenbrand Reviewed-by: Jann Horn --- mm/memory.c | 45 ++++++++++++++++++++++++++------------------- 1 file changed, 26 insertions(+), 19 deletions(-) diff --git a/mm/memory.c b/mm/memory.c index bd9ebe0f4471f..c1150e62dd073 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -1657,6 +1657,27 @@ static inline int zap_nonpresent_ptes(struct mmu_gat= her *tlb, return nr; } =20 +static inline int do_zap_pte_range(struct mmu_gather *tlb, + struct vm_area_struct *vma, pte_t *pte, + unsigned long addr, unsigned long end, + struct zap_details *details, int *rss, + bool *force_flush, bool *force_break) +{ + pte_t ptent =3D ptep_get(pte); + int max_nr =3D (end - addr) / PAGE_SIZE; + + if (pte_none(ptent)) + return 1; + + if (pte_present(ptent)) + return zap_present_ptes(tlb, vma, pte, ptent, max_nr, + addr, details, rss, force_flush, + force_break); + + return zap_nonpresent_ptes(tlb, vma, pte, ptent, max_nr, addr, + details, rss); +} + static unsigned long zap_pte_range(struct mmu_gather *tlb, struct vm_area_struct *vma, pmd_t *pmd, unsigned long addr, unsigned long end, @@ -1679,28 +1700,14 @@ static unsigned long zap_pte_range(struct mmu_gathe= r *tlb, flush_tlb_batched_pending(mm); 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charset="utf-8" In preparation for reclaiming empty PTE pages, this commit first makes zap_pte_range() to handle the full within-PMD range, so that we can more easily detect and free PTE pages in this function in subsequent commits. Signed-off-by: Qi Zheng Reviewed-by: Jann Horn --- mm/memory.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/mm/memory.c b/mm/memory.c index c1150e62dd073..002aa4f454fa0 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -1691,6 +1691,7 @@ static unsigned long zap_pte_range(struct mmu_gather = *tlb, pte_t *pte; int nr; =20 +retry: tlb_change_page_size(tlb, PAGE_SIZE); init_rss_vec(rss); start_pte =3D pte =3D pte_offset_map_lock(mm, pmd, addr, &ptl); @@ -1730,6 +1731,13 @@ static unsigned long zap_pte_range(struct mmu_gather= *tlb, if (force_flush) tlb_flush_mmu(tlb); =20 + if (addr !=3D end) { + cond_resched(); + force_flush =3D false; + force_break =3D false; + goto retry; + } + return addr; } =20 --=20 2.20.1 From nobody Mon Nov 25 02:08:42 2024 Received: from mail-pj1-f43.google.com (mail-pj1-f43.google.com [209.85.216.43]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 542AB156236 for ; 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charset="utf-8" Now in order to pursue high performance, applications mostly use some high-performance user-mode memory allocators, such as jemalloc or tcmalloc. These memory allocators use madvise(MADV_DONTNEED or MADV_FREE) to release physical memory, but neither MADV_DONTNEED nor MADV_FREE will release page table memory, which may cause huge page table memory usage. The following are a memory usage snapshot of one process which actually happened on our server: VIRT: 55t RES: 590g VmPTE: 110g In this case, most of the page table entries are empty. For such a PTE page where all entries are empty, we can actually free it back to the system for others to use. As a first step, this commit aims to synchronously free the empty PTE pages in madvise(MADV_DONTNEED) case. We will detect and free empty PTE pages in zap_pte_range(), and will add zap_details.reclaim_pt to exclude cases other than madvise(MADV_DONTNEED). Once an empty PTE is detected, we first try to hold the pmd lock within the pte lock. If successful, we clear the pmd entry directly (fast path). Otherwise, we wait until the pte lock is released, then re-hold the pmd and pte locks and loop PTRS_PER_PTE times to check pte_none() to re-detect whether the PTE page is empty and free it (slow path). For other cases such as madvise(MADV_FREE), consider scanning and freeing empty PTE pages asynchronously in the future. The following code snippet can show the effect of optimization: mmap 50G while (1) { for (; i < 1024 * 25; i++) { touch 2M memory madvise MADV_DONTNEED 2M } } As we can see, the memory usage of VmPTE is reduced: before after VIRT 50.0 GB 50.0 GB RES 3.1 MB 3.1 MB VmPTE 102640 KB 240 KB Signed-off-by: Qi Zheng --- include/linux/mm.h | 1 + mm/Kconfig | 15 ++++++++++ mm/Makefile | 1 + mm/internal.h | 23 ++++++++++++++++ mm/madvise.c | 4 ++- mm/memory.c | 45 +++++++++++++++++++++++++++++- mm/pt_reclaim.c | 68 ++++++++++++++++++++++++++++++++++++++++++++++ 7 files changed, 155 insertions(+), 2 deletions(-) create mode 100644 mm/pt_reclaim.c diff --git a/include/linux/mm.h b/include/linux/mm.h index 3e4bb43035953..ce3936590fe72 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -2319,6 +2319,7 @@ extern void pagefault_out_of_memory(void); struct zap_details { struct folio *single_folio; /* Locked folio to be unmapped */ bool even_cows; /* Zap COWed private pages too? */ + bool reclaim_pt; /* Need reclaim page tables? */ zap_flags_t zap_flags; /* Extra flags for zapping */ }; =20 diff --git a/mm/Kconfig b/mm/Kconfig index 84000b0168086..681909e0a9fa3 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -1301,6 +1301,21 @@ config ARCH_HAS_USER_SHADOW_STACK The architecture has hardware support for userspace shadow call stacks (eg, x86 CET, arm64 GCS or RISC-V Zicfiss). =20 +config ARCH_SUPPORTS_PT_RECLAIM + def_bool n + +config PT_RECLAIM + bool "reclaim empty user page table pages" + default y + depends on ARCH_SUPPORTS_PT_RECLAIM && MMU && SMP + select MMU_GATHER_RCU_TABLE_FREE + help + Try to reclaim empty user page table pages in paths other that munmap + and exit_mmap path. + + Note: now only empty user PTE page table pages will be reclaimed. + + source "mm/damon/Kconfig" =20 endmenu diff --git a/mm/Makefile b/mm/Makefile index d5639b0361663..9d816323d247a 100644 --- a/mm/Makefile +++ b/mm/Makefile @@ -145,3 +145,4 @@ obj-$(CONFIG_GENERIC_IOREMAP) +=3D ioremap.o obj-$(CONFIG_SHRINKER_DEBUG) +=3D shrinker_debug.o obj-$(CONFIG_EXECMEM) +=3D execmem.o obj-$(CONFIG_TMPFS_QUOTA) +=3D shmem_quota.o +obj-$(CONFIG_PT_RECLAIM) +=3D pt_reclaim.o diff --git a/mm/internal.h b/mm/internal.h index d5b93c5b63648..7aba395a9940f 100644 --- a/mm/internal.h +++ b/mm/internal.h @@ -1508,4 +1508,27 @@ int walk_page_range_mm(struct mm_struct *mm, unsigne= d long start, unsigned long end, const struct mm_walk_ops *ops, void *private); =20 +#ifdef CONFIG_PT_RECLAIM +bool try_get_and_clear_pmd(struct mm_struct *mm, pmd_t *pmd, pmd_t *pmdval= ); +void free_pte(struct mm_struct *mm, unsigned long addr, struct mmu_gather = *tlb, + pmd_t pmdval); +void try_to_free_pte(struct mm_struct *mm, pmd_t *pmd, unsigned long addr, + struct mmu_gather *tlb); +#else +static inline bool try_get_and_clear_pmd(struct mm_struct *mm, pmd_t *pmd, + pmd_t *pmdval) +{ + return false; +} +static inline void free_pte(struct mm_struct *mm, unsigned long addr, + struct mmu_gather *tlb, pmd_t pmdval) +{ +} +static inline void try_to_free_pte(struct mm_struct *mm, pmd_t *pmd, + unsigned long addr, struct mmu_gather *tlb) +{ +} +#endif /* CONFIG_PT_RECLAIM */ + + #endif /* __MM_INTERNAL_H */ diff --git a/mm/madvise.c b/mm/madvise.c index 0ceae57da7dad..ee88652761d45 100644 --- a/mm/madvise.c +++ b/mm/madvise.c @@ -851,7 +851,9 @@ static int madvise_free_single_vma(struct vm_area_struc= t *vma, static long madvise_dontneed_single_vma(struct vm_area_struct *vma, unsigned long start, unsigned long end) { - zap_page_range_single(vma, start, end - start, NULL); + struct zap_details details =3D {.reclaim_pt =3D true,}; + + zap_page_range_single(vma, start, end - start, &details); return 0; } =20 diff --git a/mm/memory.c b/mm/memory.c index 002aa4f454fa0..c4a8c18fbcfd7 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -1436,7 +1436,7 @@ copy_page_range(struct vm_area_struct *dst_vma, struc= t vm_area_struct *src_vma) static inline bool should_zap_cows(struct zap_details *details) { /* By default, zap all pages */ - if (!details) + if (!details || details->reclaim_pt) return true; =20 /* Or, we zap COWed pages only if the caller wants to */ @@ -1678,6 +1678,30 @@ static inline int do_zap_pte_range(struct mmu_gather= *tlb, details, rss); } =20 +static inline int count_pte_none(pte_t *pte, int nr) +{ + int none_nr =3D 0; + + /* + * If PTE_MARKER_UFFD_WP is enabled, the uffd-wp PTEs may be + * re-installed, so we need to check pte_none() one by one. + * Otherwise, checking a single PTE in a batch is sufficient. + */ +#ifdef CONFIG_PTE_MARKER_UFFD_WP + for (;;) { + if (pte_none(ptep_get(pte))) + none_nr++; + if (--nr =3D=3D 0) + break; + pte++; + } +#else + if (pte_none(ptep_get(pte))) + none_nr =3D nr; +#endif + return none_nr; +} + static unsigned long zap_pte_range(struct mmu_gather *tlb, struct vm_area_struct *vma, pmd_t *pmd, unsigned long addr, unsigned long end, @@ -1689,8 +1713,16 @@ static unsigned long zap_pte_range(struct mmu_gather= *tlb, spinlock_t *ptl; pte_t *start_pte; pte_t *pte; + pmd_t pmdval; + bool can_reclaim_pt =3D false; + bool direct_reclaim =3D false; + unsigned long start =3D addr; + int none_nr =3D 0; int nr; =20 + if (details && details->reclaim_pt && (end - start >=3D PMD_SIZE)) + can_reclaim_pt =3D true; + retry: tlb_change_page_size(tlb, PAGE_SIZE); init_rss_vec(rss); @@ -1706,12 +1738,16 @@ static unsigned long zap_pte_range(struct mmu_gathe= r *tlb, =20 nr =3D do_zap_pte_range(tlb, vma, pte, addr, end, details, rss, &force_flush, &force_break); + none_nr +=3D count_pte_none(pte, nr); if (unlikely(force_break)) { addr +=3D nr * PAGE_SIZE; break; } } while (pte +=3D nr, addr +=3D PAGE_SIZE * nr, addr !=3D end); =20 + if (addr =3D=3D end && can_reclaim_pt && (none_nr =3D=3D PTRS_PER_PTE)) + direct_reclaim =3D try_get_and_clear_pmd(mm, pmd, &pmdval); + add_mm_rss_vec(mm, rss); arch_leave_lazy_mmu_mode(); =20 @@ -1738,6 +1774,13 @@ static unsigned long zap_pte_range(struct mmu_gather= *tlb, goto retry; } =20 + if (can_reclaim_pt) { + if (direct_reclaim) + free_pte(mm, start, tlb, pmdval); + else + try_to_free_pte(mm, pmd, start, tlb); + } + return addr; } =20 diff --git a/mm/pt_reclaim.c b/mm/pt_reclaim.c new file mode 100644 index 0000000000000..fc055da40b615 --- /dev/null +++ b/mm/pt_reclaim.c @@ -0,0 +1,68 @@ +// SPDX-License-Identifier: GPL-2.0 +#include +#include +#include + +#include "internal.h" + +bool try_get_and_clear_pmd(struct mm_struct *mm, pmd_t *pmd, pmd_t *pmdval) +{ + spinlock_t *pml =3D pmd_lockptr(mm, pmd); + + if (!spin_trylock(pml)) + return false; + + *pmdval =3D pmdp_get_lockless(pmd); + pmd_clear(pmd); + spin_unlock(pml); + + return true; +} + +void free_pte(struct mm_struct *mm, unsigned long addr, struct mmu_gather = *tlb, + pmd_t pmdval) +{ + pte_free_tlb(tlb, pmd_pgtable(pmdval), addr); + mm_dec_nr_ptes(mm); +} + +void try_to_free_pte(struct mm_struct *mm, pmd_t *pmd, unsigned long addr, + struct mmu_gather *tlb) +{ + pmd_t pmdval; + spinlock_t *pml, *ptl; + pte_t *start_pte, *pte; + int i; + + start_pte =3D pte_offset_map_rw_nolock(mm, pmd, addr, &pmdval, &ptl); + if (!start_pte) + return; + + pml =3D pmd_lock(mm, pmd); + if (ptl !=3D pml) + spin_lock_nested(ptl, SINGLE_DEPTH_NESTING); + + if (unlikely(!pmd_same(pmdval, pmdp_get_lockless(pmd)))) + goto out_ptl; + + /* Check if it is empty PTE page */ + for (i =3D 0, pte =3D start_pte; i < PTRS_PER_PTE; i++, pte++) { + if (!pte_none(ptep_get(pte))) + goto out_ptl; + } + pte_unmap(start_pte); + + pmd_clear(pmd); + + if (ptl !=3D pml) + spin_unlock(ptl); + spin_unlock(pml); + + free_pte(mm, addr, tlb, pmdval); + + return; +out_ptl: + pte_unmap_unlock(start_pte, ptl); + if (pml !=3D ptl) + spin_unlock(pml); +} --=20 2.20.1 From nobody Mon Nov 25 02:08:42 2024 Received: from mail-pl1-f174.google.com (mail-pl1-f174.google.com [209.85.214.174]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 656EB1922D6 for ; 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Thu, 31 Oct 2024 01:14:44 -0700 (PDT) Received: from C02DW0BEMD6R.bytedance.net ([203.208.167.149]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-2e9201b2586sm5163996a91.0.2024.10.31.01.14.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 31 Oct 2024 01:14:44 -0700 (PDT) From: Qi Zheng To: david@redhat.com, jannh@google.com, hughd@google.com, willy@infradead.org, mgorman@suse.de, muchun.song@linux.dev, vbabka@kernel.org, akpm@linux-foundation.org, zokeefe@google.com, rientjes@google.com, peterx@redhat.com, catalin.marinas@arm.com Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, x86@kernel.org, Qi Zheng Subject: [PATCH v2 6/7] x86: mm: free page table pages by RCU instead of semi RCU Date: Thu, 31 Oct 2024 16:13:22 +0800 Message-Id: X-Mailer: git-send-email 2.24.3 (Apple Git-128) In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Now, if CONFIG_MMU_GATHER_RCU_TABLE_FREE is selected, the page table pages will be freed by semi RCU, that is: - batch table freeing: asynchronous free by RCU - single table freeing: IPI + synchronous free In this way, the page table can be lockless traversed by disabling IRQ in paths such as fast GUP. But this is not enough to free the empty PTE page table pages in paths other that munmap and exit_mmap path, because IPI cannot be synchronized with rcu_read_lock() in pte_offset_map{_lock}(). In preparation for supporting empty PTE page table pages reclaimation, let single table also be freed by RCU like batch table freeing. Then we can also use pte_offset_map() etc to prevent PTE page from being freed. Like pte_free_defer(), we can also safely use ptdesc->pt_rcu_head to free the page table pages: - The pt_rcu_head is unioned with pt_list and pmd_huge_pte. - For pt_list, it is used to manage the PGD page in x86. Fortunately tlb_remove_table() will not be used for free PGD pages, so it is safe to use pt_rcu_head. - For pmd_huge_pte, we will do zap_deposited_table() before freeing the PMD page, so it is also safe. Signed-off-by: Qi Zheng --- arch/x86/include/asm/tlb.h | 19 +++++++++++++++++++ arch/x86/kernel/paravirt.c | 7 +++++++ arch/x86/mm/pgtable.c | 10 +++++++++- mm/mmu_gather.c | 9 ++++++++- 4 files changed, 43 insertions(+), 2 deletions(-) diff --git a/arch/x86/include/asm/tlb.h b/arch/x86/include/asm/tlb.h index 580636cdc257b..e223b53a8b190 100644 --- a/arch/x86/include/asm/tlb.h +++ b/arch/x86/include/asm/tlb.h @@ -34,4 +34,23 @@ static inline void __tlb_remove_table(void *table) free_page_and_swap_cache(table); } =20 +#ifdef CONFIG_PT_RECLAIM +static inline void __tlb_remove_table_one_rcu(struct rcu_head *head) +{ + struct page *page; + + page =3D container_of(head, struct page, rcu_head); + free_page_and_swap_cache(page); +} + +static inline void __tlb_remove_table_one(void *table) +{ + struct page *page; + + page =3D table; + call_rcu(&page->rcu_head, __tlb_remove_table_one_rcu); +} +#define __tlb_remove_table_one __tlb_remove_table_one +#endif /* CONFIG_PT_RECLAIM */ + #endif /* _ASM_X86_TLB_H */ diff --git a/arch/x86/kernel/paravirt.c b/arch/x86/kernel/paravirt.c index fec3815335558..89688921ea62e 100644 --- a/arch/x86/kernel/paravirt.c +++ b/arch/x86/kernel/paravirt.c @@ -59,10 +59,17 @@ void __init native_pv_lock_init(void) static_branch_enable(&virt_spin_lock_key); } =20 +#ifndef CONFIG_PT_RECLAIM static void native_tlb_remove_table(struct mmu_gather *tlb, void *table) { tlb_remove_page(tlb, table); } +#else +static void native_tlb_remove_table(struct mmu_gather *tlb, void *table) +{ + tlb_remove_table(tlb, table); +} +#endif =20 struct static_key paravirt_steal_enabled; struct static_key paravirt_steal_rq_enabled; diff --git a/arch/x86/mm/pgtable.c b/arch/x86/mm/pgtable.c index 5745a354a241c..69a357b15974a 100644 --- a/arch/x86/mm/pgtable.c +++ b/arch/x86/mm/pgtable.c @@ -19,12 +19,20 @@ EXPORT_SYMBOL(physical_mask); #endif =20 #ifndef CONFIG_PARAVIRT +#ifndef CONFIG_PT_RECLAIM static inline void paravirt_tlb_remove_table(struct mmu_gather *tlb, void *table) { tlb_remove_page(tlb, table); } -#endif +#else +static inline +void paravirt_tlb_remove_table(struct mmu_gather *tlb, void *table) +{ + tlb_remove_table(tlb, table); +} +#endif /* !CONFIG_PT_RECLAIM */ +#endif /* !CONFIG_PARAVIRT */ =20 gfp_t __userpte_alloc_gfp =3D GFP_PGTABLE_USER | PGTABLE_HIGHMEM; 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Thu, 31 Oct 2024 01:14:51 -0700 (PDT) Received: from C02DW0BEMD6R.bytedance.net ([203.208.167.149]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-2e9201b2586sm5163996a91.0.2024.10.31.01.14.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 31 Oct 2024 01:14:51 -0700 (PDT) From: Qi Zheng To: david@redhat.com, jannh@google.com, hughd@google.com, willy@infradead.org, mgorman@suse.de, muchun.song@linux.dev, vbabka@kernel.org, akpm@linux-foundation.org, zokeefe@google.com, rientjes@google.com, peterx@redhat.com, catalin.marinas@arm.com Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, x86@kernel.org, Qi Zheng Subject: [PATCH v2 7/7] x86: select ARCH_SUPPORTS_PT_RECLAIM if X86_64 Date: Thu, 31 Oct 2024 16:13:23 +0800 Message-Id: <8ed7cdb1e5fa5e0a357bec9178b8932d596573c9.1730360798.git.zhengqi.arch@bytedance.com> X-Mailer: git-send-email 2.24.3 (Apple Git-128) In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Now, x86 has fully supported the CONFIG_PT_RECLAIM feature, and reclaiming PTE pages is profitable only on 64-bit systems, so select ARCH_SUPPORTS_PT_RECLAIM if X86_64. Signed-off-by: Qi Zheng --- arch/x86/Kconfig | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 1d194fb2f979e..194baed21ae5c 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -320,6 +320,7 @@ config X86 select FUNCTION_ALIGNMENT_4B imply IMA_SECURE_AND_OR_TRUSTED_BOOT if EFI select HAVE_DYNAMIC_FTRACE_NO_PATCHABLE + select ARCH_SUPPORTS_PT_RECLAIM if X86_64 =20 config INSTRUCTION_DECODER def_bool y --=20 2.20.1