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https://github.com/torvalds/linux
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![Linus Torvalds](/assets/img/avatar_default.png)
documented (hopefully adequately) in the respective changelogs. Notable series include: - Lucas Stach has provided some page-mapping cleanup/consolidation/maintainability work in the series "mm/treewide: Remove pXd_huge() API". - In the series "Allow migrate on protnone reference with MPOL_PREFERRED_MANY policy", Donet Tom has optimized mempolicy's MPOL_PREFERRED_MANY mode, yielding almost doubled performance in one test. - In their series "Memory allocation profiling" Kent Overstreet and Suren Baghdasaryan have contributed a means of determining (via /proc/allocinfo) whereabouts in the kernel memory is being allocated: number of calls and amount of memory. - Matthew Wilcox has provided the series "Various significant MM patches" which does a number of rather unrelated things, but in largely similar code sites. - In his series "mm: page_alloc: freelist migratetype hygiene" Johannes Weiner has fixed the page allocator's handling of migratetype requests, with resulting improvements in compaction efficiency. - In the series "make the hugetlb migration strategy consistent" Baolin Wang has fixed a hugetlb migration issue, which should improve hugetlb allocation reliability. - Liu Shixin has hit an I/O meltdown caused by readahead in a memory-tight memcg. Addressed in the series "Fix I/O high when memory almost met memcg limit". - In the series "mm/filemap: optimize folio adding and splitting" Kairui Song has optimized pagecache insertion, yielding ~10% performance improvement in one test. - Baoquan He has cleaned up and consolidated the early zone initialization code in the series "mm/mm_init.c: refactor free_area_init_core()". - Baoquan has also redone some MM initializatio code in the series "mm/init: minor clean up and improvement". - MM helper cleanups from Christoph Hellwig in his series "remove follow_pfn". - More cleanups from Matthew Wilcox in the series "Various page->flags cleanups". - Vlastimil Babka has contributed maintainability improvements in the series "memcg_kmem hooks refactoring". - More folio conversions and cleanups in Matthew Wilcox's series "Convert huge_zero_page to huge_zero_folio" "khugepaged folio conversions" "Remove page_idle and page_young wrappers" "Use folio APIs in procfs" "Clean up __folio_put()" "Some cleanups for memory-failure" "Remove page_mapping()" "More folio compat code removal" - David Hildenbrand chipped in with "fs/proc/task_mmu: convert hugetlb functions to work on folis". - Code consolidation and cleanup work related to GUP's handling of hugetlbs in Peter Xu's series "mm/gup: Unify hugetlb, part 2". - Rick Edgecombe has developed some fixes to stack guard gaps in the series "Cover a guard gap corner case". - Jinjiang Tu has fixed KSM's behaviour after a fork+exec in the series "mm/ksm: fix ksm exec support for prctl". - Baolin Wang has implemented NUMA balancing for multi-size THPs. This is a simple first-cut implementation for now. The series is "support multi-size THP numa balancing". - Cleanups to vma handling helper functions from Matthew Wilcox in the series "Unify vma_address and vma_pgoff_address". - Some selftests maintenance work from Dev Jain in the series "selftests/mm: mremap_test: Optimizations and style fixes". - Improvements to the swapping of multi-size THPs from Ryan Roberts in the series "Swap-out mTHP without splitting". - Kefeng Wang has significantly optimized the handling of arm64's permission page faults in the series "arch/mm/fault: accelerate pagefault when badaccess" "mm: remove arch's private VM_FAULT_BADMAP/BADACCESS" - GUP cleanups from David Hildenbrand in "mm/gup: consistently call it GUP-fast". - hugetlb fault code cleanups from Vishal Moola in "Hugetlb fault path to use struct vm_fault". - selftests build fixes from John Hubbard in the series "Fix selftests/mm build without requiring "make headers"". - Memory tiering fixes/improvements from Ho-Ren (Jack) Chuang in the series "Improved Memory Tier Creation for CPUless NUMA Nodes". Fixes the initialization code so that migration between different memory types works as intended. - David Hildenbrand has improved follow_pte() and fixed an errant driver in the series "mm: follow_pte() improvements and acrn follow_pte() fixes". - David also did some cleanup work on large folio mapcounts in his series "mm: mapcount for large folios + page_mapcount() cleanups". - Folio conversions in KSM in Alex Shi's series "transfer page to folio in KSM". - Barry Song has added some sysfs stats for monitoring multi-size THP's in the series "mm: add per-order mTHP alloc and swpout counters". - Some zswap cleanups from Yosry Ahmed in the series "zswap same-filled and limit checking cleanups". - Matthew Wilcox has been looking at buffer_head code and found the documentation to be lacking. The series is "Improve buffer head documentation". - Multi-size THPs get more work, this time from Lance Yang. His series "mm/madvise: enhance lazyfreeing with mTHP in madvise_free" optimizes the freeing of these things. - Kemeng Shi has added more userspace-visible writeback instrumentation in the series "Improve visibility of writeback". - Kemeng Shi then sent some maintenance work on top in the series "Fix and cleanups to page-writeback". - Matthew Wilcox reduces mmap_lock traffic in the anon vma code in the series "Improve anon_vma scalability for anon VMAs". Intel's test bot reported an improbable 3x improvement in one test. - SeongJae Park adds some DAMON feature work in the series "mm/damon: add a DAMOS filter type for page granularity access recheck" "selftests/damon: add DAMOS quota goal test" - Also some maintenance work in the series "mm/damon/paddr: simplify page level access re-check for pageout" "mm/damon: misc fixes and improvements" - David Hildenbrand has disabled some known-to-fail selftests ni the series "selftests: mm: cow: flag vmsplice() hugetlb tests as XFAIL". - memcg metadata storage optimizations from Shakeel Butt in "memcg: reduce memory consumption by memcg stats". - DAX fixes and maintenance work from Vishal Verma in the series "dax/bus.c: Fixups for dax-bus locking". -----BEGIN PGP SIGNATURE----- iHUEABYIAB0WIQTTMBEPP41GrTpTJgfdBJ7gKXxAjgUCZkgQYwAKCRDdBJ7gKXxA jrdKAP9WVJdpEcXxpoub/vVE0UWGtffr8foifi9bCwrQrGh5mgEAx7Yf0+d/oBZB nvA4E0DcPrUAFy144FNM0NTCb7u9vAw= =V3R/ -----END PGP SIGNATURE----- Merge tag 'mm-stable-2024-05-17-19-19' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Pull mm updates from Andrew Morton: "The usual shower of singleton fixes and minor series all over MM, documented (hopefully adequately) in the respective changelogs. Notable series include: - Lucas Stach has provided some page-mapping cleanup/consolidation/ maintainability work in the series "mm/treewide: Remove pXd_huge() API". - In the series "Allow migrate on protnone reference with MPOL_PREFERRED_MANY policy", Donet Tom has optimized mempolicy's MPOL_PREFERRED_MANY mode, yielding almost doubled performance in one test. - In their series "Memory allocation profiling" Kent Overstreet and Suren Baghdasaryan have contributed a means of determining (via /proc/allocinfo) whereabouts in the kernel memory is being allocated: number of calls and amount of memory. - Matthew Wilcox has provided the series "Various significant MM patches" which does a number of rather unrelated things, but in largely similar code sites. - In his series "mm: page_alloc: freelist migratetype hygiene" Johannes Weiner has fixed the page allocator's handling of migratetype requests, with resulting improvements in compaction efficiency. - In the series "make the hugetlb migration strategy consistent" Baolin Wang has fixed a hugetlb migration issue, which should improve hugetlb allocation reliability. - Liu Shixin has hit an I/O meltdown caused by readahead in a memory-tight memcg. Addressed in the series "Fix I/O high when memory almost met memcg limit". - In the series "mm/filemap: optimize folio adding and splitting" Kairui Song has optimized pagecache insertion, yielding ~10% performance improvement in one test. - Baoquan He has cleaned up and consolidated the early zone initialization code in the series "mm/mm_init.c: refactor free_area_init_core()". - Baoquan has also redone some MM initializatio code in the series "mm/init: minor clean up and improvement". - MM helper cleanups from Christoph Hellwig in his series "remove follow_pfn". - More cleanups from Matthew Wilcox in the series "Various page->flags cleanups". - Vlastimil Babka has contributed maintainability improvements in the series "memcg_kmem hooks refactoring". - More folio conversions and cleanups in Matthew Wilcox's series: "Convert huge_zero_page to huge_zero_folio" "khugepaged folio conversions" "Remove page_idle and page_young wrappers" "Use folio APIs in procfs" "Clean up __folio_put()" "Some cleanups for memory-failure" "Remove page_mapping()" "More folio compat code removal" - David Hildenbrand chipped in with "fs/proc/task_mmu: convert hugetlb functions to work on folis". - Code consolidation and cleanup work related to GUP's handling of hugetlbs in Peter Xu's series "mm/gup: Unify hugetlb, part 2". - Rick Edgecombe has developed some fixes to stack guard gaps in the series "Cover a guard gap corner case". - Jinjiang Tu has fixed KSM's behaviour after a fork+exec in the series "mm/ksm: fix ksm exec support for prctl". - Baolin Wang has implemented NUMA balancing for multi-size THPs. This is a simple first-cut implementation for now. The series is "support multi-size THP numa balancing". - Cleanups to vma handling helper functions from Matthew Wilcox in the series "Unify vma_address and vma_pgoff_address". - Some selftests maintenance work from Dev Jain in the series "selftests/mm: mremap_test: Optimizations and style fixes". - Improvements to the swapping of multi-size THPs from Ryan Roberts in the series "Swap-out mTHP without splitting". - Kefeng Wang has significantly optimized the handling of arm64's permission page faults in the series "arch/mm/fault: accelerate pagefault when badaccess" "mm: remove arch's private VM_FAULT_BADMAP/BADACCESS" - GUP cleanups from David Hildenbrand in "mm/gup: consistently call it GUP-fast". - hugetlb fault code cleanups from Vishal Moola in "Hugetlb fault path to use struct vm_fault". - selftests build fixes from John Hubbard in the series "Fix selftests/mm build without requiring "make headers"". - Memory tiering fixes/improvements from Ho-Ren (Jack) Chuang in the series "Improved Memory Tier Creation for CPUless NUMA Nodes". Fixes the initialization code so that migration between different memory types works as intended. - David Hildenbrand has improved follow_pte() and fixed an errant driver in the series "mm: follow_pte() improvements and acrn follow_pte() fixes". - David also did some cleanup work on large folio mapcounts in his series "mm: mapcount for large folios + page_mapcount() cleanups". - Folio conversions in KSM in Alex Shi's series "transfer page to folio in KSM". - Barry Song has added some sysfs stats for monitoring multi-size THP's in the series "mm: add per-order mTHP alloc and swpout counters". - Some zswap cleanups from Yosry Ahmed in the series "zswap same-filled and limit checking cleanups". - Matthew Wilcox has been looking at buffer_head code and found the documentation to be lacking. The series is "Improve buffer head documentation". - Multi-size THPs get more work, this time from Lance Yang. His series "mm/madvise: enhance lazyfreeing with mTHP in madvise_free" optimizes the freeing of these things. - Kemeng Shi has added more userspace-visible writeback instrumentation in the series "Improve visibility of writeback". - Kemeng Shi then sent some maintenance work on top in the series "Fix and cleanups to page-writeback". - Matthew Wilcox reduces mmap_lock traffic in the anon vma code in the series "Improve anon_vma scalability for anon VMAs". Intel's test bot reported an improbable 3x improvement in one test. - SeongJae Park adds some DAMON feature work in the series "mm/damon: add a DAMOS filter type for page granularity access recheck" "selftests/damon: add DAMOS quota goal test" - Also some maintenance work in the series "mm/damon/paddr: simplify page level access re-check for pageout" "mm/damon: misc fixes and improvements" - David Hildenbrand has disabled some known-to-fail selftests ni the series "selftests: mm: cow: flag vmsplice() hugetlb tests as XFAIL". - memcg metadata storage optimizations from Shakeel Butt in "memcg: reduce memory consumption by memcg stats". - DAX fixes and maintenance work from Vishal Verma in the series "dax/bus.c: Fixups for dax-bus locking"" * tag 'mm-stable-2024-05-17-19-19' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (426 commits) memcg, oom: cleanup unused memcg_oom_gfp_mask and memcg_oom_order selftests/mm: hugetlb_madv_vs_map: avoid test skipping by querying hugepage size at runtime mm/hugetlb: add missing VM_FAULT_SET_HINDEX in hugetlb_wp mm/hugetlb: add missing VM_FAULT_SET_HINDEX in hugetlb_fault selftests: cgroup: add tests to verify the zswap writeback path mm: memcg: make alloc_mem_cgroup_per_node_info() return bool mm/damon/core: fix return value from damos_wmark_metric_value mm: do not update memcg stats for NR_{FILE/SHMEM}_PMDMAPPED selftests: cgroup: remove redundant enabling of memory controller Docs/mm/damon/maintainer-profile: allow posting patches based on damon/next tree Docs/mm/damon/maintainer-profile: change the maintainer's timezone from PST to PT Docs/mm/damon/design: use a list for supported filters Docs/admin-guide/mm/damon/usage: fix wrong schemes effective quota update command Docs/admin-guide/mm/damon/usage: fix wrong example of DAMOS filter matching sysfs file selftests/damon: classify tests for functionalities and regressions selftests/damon/_damon_sysfs: use 'is' instead of '==' for 'None' selftests/damon/_damon_sysfs: find sysfs mount point from /proc/mounts selftests/damon/_damon_sysfs: check errors from nr_schemes file reads mm/damon/core: initialize ->esz_bp from damos_quota_init_priv() selftests/damon: add a test for DAMOS quota goal ...
684 lines
18 KiB
C
684 lines
18 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef MM_SLAB_H
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#define MM_SLAB_H
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#include <linux/reciprocal_div.h>
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#include <linux/list_lru.h>
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#include <linux/local_lock.h>
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#include <linux/random.h>
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#include <linux/kobject.h>
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#include <linux/sched/mm.h>
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#include <linux/memcontrol.h>
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#include <linux/kfence.h>
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#include <linux/kasan.h>
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/*
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* Internal slab definitions
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*/
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#ifdef CONFIG_64BIT
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# ifdef system_has_cmpxchg128
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# define system_has_freelist_aba() system_has_cmpxchg128()
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# define try_cmpxchg_freelist try_cmpxchg128
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# endif
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#define this_cpu_try_cmpxchg_freelist this_cpu_try_cmpxchg128
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typedef u128 freelist_full_t;
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#else /* CONFIG_64BIT */
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# ifdef system_has_cmpxchg64
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# define system_has_freelist_aba() system_has_cmpxchg64()
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# define try_cmpxchg_freelist try_cmpxchg64
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# endif
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#define this_cpu_try_cmpxchg_freelist this_cpu_try_cmpxchg64
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typedef u64 freelist_full_t;
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#endif /* CONFIG_64BIT */
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#if defined(system_has_freelist_aba) && !defined(CONFIG_HAVE_ALIGNED_STRUCT_PAGE)
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#undef system_has_freelist_aba
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#endif
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/*
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* Freelist pointer and counter to cmpxchg together, avoids the typical ABA
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* problems with cmpxchg of just a pointer.
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*/
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typedef union {
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struct {
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void *freelist;
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unsigned long counter;
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};
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freelist_full_t full;
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} freelist_aba_t;
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/* Reuses the bits in struct page */
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struct slab {
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unsigned long __page_flags;
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struct kmem_cache *slab_cache;
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union {
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struct {
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union {
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struct list_head slab_list;
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#ifdef CONFIG_SLUB_CPU_PARTIAL
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struct {
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struct slab *next;
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int slabs; /* Nr of slabs left */
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};
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#endif
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};
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/* Double-word boundary */
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union {
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struct {
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void *freelist; /* first free object */
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union {
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unsigned long counters;
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struct {
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unsigned inuse:16;
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unsigned objects:15;
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unsigned frozen:1;
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};
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};
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};
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#ifdef system_has_freelist_aba
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freelist_aba_t freelist_counter;
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#endif
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};
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};
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struct rcu_head rcu_head;
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};
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unsigned int __page_type;
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atomic_t __page_refcount;
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#ifdef CONFIG_SLAB_OBJ_EXT
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unsigned long obj_exts;
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#endif
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};
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#define SLAB_MATCH(pg, sl) \
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static_assert(offsetof(struct page, pg) == offsetof(struct slab, sl))
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SLAB_MATCH(flags, __page_flags);
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SLAB_MATCH(compound_head, slab_cache); /* Ensure bit 0 is clear */
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SLAB_MATCH(_refcount, __page_refcount);
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#ifdef CONFIG_SLAB_OBJ_EXT
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SLAB_MATCH(memcg_data, obj_exts);
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#endif
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#undef SLAB_MATCH
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static_assert(sizeof(struct slab) <= sizeof(struct page));
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#if defined(system_has_freelist_aba)
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static_assert(IS_ALIGNED(offsetof(struct slab, freelist), sizeof(freelist_aba_t)));
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#endif
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/**
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* folio_slab - Converts from folio to slab.
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* @folio: The folio.
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*
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* Currently struct slab is a different representation of a folio where
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* folio_test_slab() is true.
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*
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* Return: The slab which contains this folio.
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*/
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#define folio_slab(folio) (_Generic((folio), \
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const struct folio *: (const struct slab *)(folio), \
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struct folio *: (struct slab *)(folio)))
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/**
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* slab_folio - The folio allocated for a slab
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* @slab: The slab.
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*
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* Slabs are allocated as folios that contain the individual objects and are
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* using some fields in the first struct page of the folio - those fields are
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* now accessed by struct slab. It is occasionally necessary to convert back to
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* a folio in order to communicate with the rest of the mm. Please use this
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* helper function instead of casting yourself, as the implementation may change
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* in the future.
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*/
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#define slab_folio(s) (_Generic((s), \
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const struct slab *: (const struct folio *)s, \
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struct slab *: (struct folio *)s))
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/**
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* page_slab - Converts from first struct page to slab.
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* @p: The first (either head of compound or single) page of slab.
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*
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* A temporary wrapper to convert struct page to struct slab in situations where
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* we know the page is the compound head, or single order-0 page.
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*
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* Long-term ideally everything would work with struct slab directly or go
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* through folio to struct slab.
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*
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* Return: The slab which contains this page
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*/
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#define page_slab(p) (_Generic((p), \
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const struct page *: (const struct slab *)(p), \
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struct page *: (struct slab *)(p)))
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/**
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* slab_page - The first struct page allocated for a slab
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* @slab: The slab.
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*
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* A convenience wrapper for converting slab to the first struct page of the
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* underlying folio, to communicate with code not yet converted to folio or
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* struct slab.
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*/
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#define slab_page(s) folio_page(slab_folio(s), 0)
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/*
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* If network-based swap is enabled, sl*b must keep track of whether pages
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* were allocated from pfmemalloc reserves.
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*/
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static inline bool slab_test_pfmemalloc(const struct slab *slab)
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{
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return folio_test_active((struct folio *)slab_folio(slab));
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}
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static inline void slab_set_pfmemalloc(struct slab *slab)
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{
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folio_set_active(slab_folio(slab));
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}
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static inline void slab_clear_pfmemalloc(struct slab *slab)
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{
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folio_clear_active(slab_folio(slab));
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}
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static inline void __slab_clear_pfmemalloc(struct slab *slab)
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{
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__folio_clear_active(slab_folio(slab));
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}
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static inline void *slab_address(const struct slab *slab)
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{
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return folio_address(slab_folio(slab));
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}
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static inline int slab_nid(const struct slab *slab)
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{
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return folio_nid(slab_folio(slab));
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}
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static inline pg_data_t *slab_pgdat(const struct slab *slab)
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{
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return folio_pgdat(slab_folio(slab));
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}
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static inline struct slab *virt_to_slab(const void *addr)
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{
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struct folio *folio = virt_to_folio(addr);
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if (!folio_test_slab(folio))
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return NULL;
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return folio_slab(folio);
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}
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static inline int slab_order(const struct slab *slab)
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{
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return folio_order((struct folio *)slab_folio(slab));
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}
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static inline size_t slab_size(const struct slab *slab)
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{
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return PAGE_SIZE << slab_order(slab);
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}
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#ifdef CONFIG_SLUB_CPU_PARTIAL
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#define slub_percpu_partial(c) ((c)->partial)
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#define slub_set_percpu_partial(c, p) \
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({ \
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slub_percpu_partial(c) = (p)->next; \
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})
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#define slub_percpu_partial_read_once(c) READ_ONCE(slub_percpu_partial(c))
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#else
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#define slub_percpu_partial(c) NULL
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#define slub_set_percpu_partial(c, p)
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#define slub_percpu_partial_read_once(c) NULL
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#endif // CONFIG_SLUB_CPU_PARTIAL
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/*
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* Word size structure that can be atomically updated or read and that
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* contains both the order and the number of objects that a slab of the
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* given order would contain.
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*/
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struct kmem_cache_order_objects {
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unsigned int x;
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};
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/*
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* Slab cache management.
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*/
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struct kmem_cache {
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#ifndef CONFIG_SLUB_TINY
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struct kmem_cache_cpu __percpu *cpu_slab;
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#endif
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/* Used for retrieving partial slabs, etc. */
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slab_flags_t flags;
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unsigned long min_partial;
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unsigned int size; /* Object size including metadata */
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unsigned int object_size; /* Object size without metadata */
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struct reciprocal_value reciprocal_size;
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unsigned int offset; /* Free pointer offset */
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#ifdef CONFIG_SLUB_CPU_PARTIAL
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/* Number of per cpu partial objects to keep around */
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unsigned int cpu_partial;
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/* Number of per cpu partial slabs to keep around */
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unsigned int cpu_partial_slabs;
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#endif
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struct kmem_cache_order_objects oo;
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/* Allocation and freeing of slabs */
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struct kmem_cache_order_objects min;
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gfp_t allocflags; /* gfp flags to use on each alloc */
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int refcount; /* Refcount for slab cache destroy */
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void (*ctor)(void *object); /* Object constructor */
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unsigned int inuse; /* Offset to metadata */
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unsigned int align; /* Alignment */
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unsigned int red_left_pad; /* Left redzone padding size */
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const char *name; /* Name (only for display!) */
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struct list_head list; /* List of slab caches */
|
|
#ifdef CONFIG_SYSFS
|
|
struct kobject kobj; /* For sysfs */
|
|
#endif
|
|
#ifdef CONFIG_SLAB_FREELIST_HARDENED
|
|
unsigned long random;
|
|
#endif
|
|
|
|
#ifdef CONFIG_NUMA
|
|
/*
|
|
* Defragmentation by allocating from a remote node.
|
|
*/
|
|
unsigned int remote_node_defrag_ratio;
|
|
#endif
|
|
|
|
#ifdef CONFIG_SLAB_FREELIST_RANDOM
|
|
unsigned int *random_seq;
|
|
#endif
|
|
|
|
#ifdef CONFIG_KASAN_GENERIC
|
|
struct kasan_cache kasan_info;
|
|
#endif
|
|
|
|
#ifdef CONFIG_HARDENED_USERCOPY
|
|
unsigned int useroffset; /* Usercopy region offset */
|
|
unsigned int usersize; /* Usercopy region size */
|
|
#endif
|
|
|
|
struct kmem_cache_node *node[MAX_NUMNODES];
|
|
};
|
|
|
|
#if defined(CONFIG_SYSFS) && !defined(CONFIG_SLUB_TINY)
|
|
#define SLAB_SUPPORTS_SYSFS
|
|
void sysfs_slab_unlink(struct kmem_cache *s);
|
|
void sysfs_slab_release(struct kmem_cache *s);
|
|
#else
|
|
static inline void sysfs_slab_unlink(struct kmem_cache *s) { }
|
|
static inline void sysfs_slab_release(struct kmem_cache *s) { }
|
|
#endif
|
|
|
|
void *fixup_red_left(struct kmem_cache *s, void *p);
|
|
|
|
static inline void *nearest_obj(struct kmem_cache *cache,
|
|
const struct slab *slab, void *x)
|
|
{
|
|
void *object = x - (x - slab_address(slab)) % cache->size;
|
|
void *last_object = slab_address(slab) +
|
|
(slab->objects - 1) * cache->size;
|
|
void *result = (unlikely(object > last_object)) ? last_object : object;
|
|
|
|
result = fixup_red_left(cache, result);
|
|
return result;
|
|
}
|
|
|
|
/* Determine object index from a given position */
|
|
static inline unsigned int __obj_to_index(const struct kmem_cache *cache,
|
|
void *addr, void *obj)
|
|
{
|
|
return reciprocal_divide(kasan_reset_tag(obj) - addr,
|
|
cache->reciprocal_size);
|
|
}
|
|
|
|
static inline unsigned int obj_to_index(const struct kmem_cache *cache,
|
|
const struct slab *slab, void *obj)
|
|
{
|
|
if (is_kfence_address(obj))
|
|
return 0;
|
|
return __obj_to_index(cache, slab_address(slab), obj);
|
|
}
|
|
|
|
static inline int objs_per_slab(const struct kmem_cache *cache,
|
|
const struct slab *slab)
|
|
{
|
|
return slab->objects;
|
|
}
|
|
|
|
/*
|
|
* State of the slab allocator.
|
|
*
|
|
* This is used to describe the states of the allocator during bootup.
|
|
* Allocators use this to gradually bootstrap themselves. Most allocators
|
|
* have the problem that the structures used for managing slab caches are
|
|
* allocated from slab caches themselves.
|
|
*/
|
|
enum slab_state {
|
|
DOWN, /* No slab functionality yet */
|
|
PARTIAL, /* SLUB: kmem_cache_node available */
|
|
UP, /* Slab caches usable but not all extras yet */
|
|
FULL /* Everything is working */
|
|
};
|
|
|
|
extern enum slab_state slab_state;
|
|
|
|
/* The slab cache mutex protects the management structures during changes */
|
|
extern struct mutex slab_mutex;
|
|
|
|
/* The list of all slab caches on the system */
|
|
extern struct list_head slab_caches;
|
|
|
|
/* The slab cache that manages slab cache information */
|
|
extern struct kmem_cache *kmem_cache;
|
|
|
|
/* A table of kmalloc cache names and sizes */
|
|
extern const struct kmalloc_info_struct {
|
|
const char *name[NR_KMALLOC_TYPES];
|
|
unsigned int size;
|
|
} kmalloc_info[];
|
|
|
|
/* Kmalloc array related functions */
|
|
void setup_kmalloc_cache_index_table(void);
|
|
void create_kmalloc_caches(void);
|
|
|
|
extern u8 kmalloc_size_index[24];
|
|
|
|
static inline unsigned int size_index_elem(unsigned int bytes)
|
|
{
|
|
return (bytes - 1) / 8;
|
|
}
|
|
|
|
/*
|
|
* Find the kmem_cache structure that serves a given size of
|
|
* allocation
|
|
*
|
|
* This assumes size is larger than zero and not larger than
|
|
* KMALLOC_MAX_CACHE_SIZE and the caller must check that.
|
|
*/
|
|
static inline struct kmem_cache *
|
|
kmalloc_slab(size_t size, gfp_t flags, unsigned long caller)
|
|
{
|
|
unsigned int index;
|
|
|
|
if (size <= 192)
|
|
index = kmalloc_size_index[size_index_elem(size)];
|
|
else
|
|
index = fls(size - 1);
|
|
|
|
return kmalloc_caches[kmalloc_type(flags, caller)][index];
|
|
}
|
|
|
|
gfp_t kmalloc_fix_flags(gfp_t flags);
|
|
|
|
/* Functions provided by the slab allocators */
|
|
int __kmem_cache_create(struct kmem_cache *, slab_flags_t flags);
|
|
|
|
void __init kmem_cache_init(void);
|
|
extern void create_boot_cache(struct kmem_cache *, const char *name,
|
|
unsigned int size, slab_flags_t flags,
|
|
unsigned int useroffset, unsigned int usersize);
|
|
|
|
int slab_unmergeable(struct kmem_cache *s);
|
|
struct kmem_cache *find_mergeable(unsigned size, unsigned align,
|
|
slab_flags_t flags, const char *name, void (*ctor)(void *));
|
|
struct kmem_cache *
|
|
__kmem_cache_alias(const char *name, unsigned int size, unsigned int align,
|
|
slab_flags_t flags, void (*ctor)(void *));
|
|
|
|
slab_flags_t kmem_cache_flags(slab_flags_t flags, const char *name);
|
|
|
|
static inline bool is_kmalloc_cache(struct kmem_cache *s)
|
|
{
|
|
return (s->flags & SLAB_KMALLOC);
|
|
}
|
|
|
|
/* Legal flag mask for kmem_cache_create(), for various configurations */
|
|
#define SLAB_CORE_FLAGS (SLAB_HWCACHE_ALIGN | SLAB_CACHE_DMA | \
|
|
SLAB_CACHE_DMA32 | SLAB_PANIC | \
|
|
SLAB_TYPESAFE_BY_RCU | SLAB_DEBUG_OBJECTS )
|
|
|
|
#ifdef CONFIG_SLUB_DEBUG
|
|
#define SLAB_DEBUG_FLAGS (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER | \
|
|
SLAB_TRACE | SLAB_CONSISTENCY_CHECKS)
|
|
#else
|
|
#define SLAB_DEBUG_FLAGS (0)
|
|
#endif
|
|
|
|
#define SLAB_CACHE_FLAGS (SLAB_NOLEAKTRACE | SLAB_RECLAIM_ACCOUNT | \
|
|
SLAB_TEMPORARY | SLAB_ACCOUNT | \
|
|
SLAB_NO_USER_FLAGS | SLAB_KMALLOC | SLAB_NO_MERGE)
|
|
|
|
/* Common flags available with current configuration */
|
|
#define CACHE_CREATE_MASK (SLAB_CORE_FLAGS | SLAB_DEBUG_FLAGS | SLAB_CACHE_FLAGS)
|
|
|
|
/* Common flags permitted for kmem_cache_create */
|
|
#define SLAB_FLAGS_PERMITTED (SLAB_CORE_FLAGS | \
|
|
SLAB_RED_ZONE | \
|
|
SLAB_POISON | \
|
|
SLAB_STORE_USER | \
|
|
SLAB_TRACE | \
|
|
SLAB_CONSISTENCY_CHECKS | \
|
|
SLAB_NOLEAKTRACE | \
|
|
SLAB_RECLAIM_ACCOUNT | \
|
|
SLAB_TEMPORARY | \
|
|
SLAB_ACCOUNT | \
|
|
SLAB_KMALLOC | \
|
|
SLAB_NO_MERGE | \
|
|
SLAB_NO_USER_FLAGS)
|
|
|
|
bool __kmem_cache_empty(struct kmem_cache *);
|
|
int __kmem_cache_shutdown(struct kmem_cache *);
|
|
void __kmem_cache_release(struct kmem_cache *);
|
|
int __kmem_cache_shrink(struct kmem_cache *);
|
|
void slab_kmem_cache_release(struct kmem_cache *);
|
|
|
|
struct seq_file;
|
|
struct file;
|
|
|
|
struct slabinfo {
|
|
unsigned long active_objs;
|
|
unsigned long num_objs;
|
|
unsigned long active_slabs;
|
|
unsigned long num_slabs;
|
|
unsigned long shared_avail;
|
|
unsigned int limit;
|
|
unsigned int batchcount;
|
|
unsigned int shared;
|
|
unsigned int objects_per_slab;
|
|
unsigned int cache_order;
|
|
};
|
|
|
|
void get_slabinfo(struct kmem_cache *s, struct slabinfo *sinfo);
|
|
|
|
#ifdef CONFIG_SLUB_DEBUG
|
|
#ifdef CONFIG_SLUB_DEBUG_ON
|
|
DECLARE_STATIC_KEY_TRUE(slub_debug_enabled);
|
|
#else
|
|
DECLARE_STATIC_KEY_FALSE(slub_debug_enabled);
|
|
#endif
|
|
extern void print_tracking(struct kmem_cache *s, void *object);
|
|
long validate_slab_cache(struct kmem_cache *s);
|
|
static inline bool __slub_debug_enabled(void)
|
|
{
|
|
return static_branch_unlikely(&slub_debug_enabled);
|
|
}
|
|
#else
|
|
static inline void print_tracking(struct kmem_cache *s, void *object)
|
|
{
|
|
}
|
|
static inline bool __slub_debug_enabled(void)
|
|
{
|
|
return false;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Returns true if any of the specified slab_debug flags is enabled for the
|
|
* cache. Use only for flags parsed by setup_slub_debug() as it also enables
|
|
* the static key.
|
|
*/
|
|
static inline bool kmem_cache_debug_flags(struct kmem_cache *s, slab_flags_t flags)
|
|
{
|
|
if (IS_ENABLED(CONFIG_SLUB_DEBUG))
|
|
VM_WARN_ON_ONCE(!(flags & SLAB_DEBUG_FLAGS));
|
|
if (__slub_debug_enabled())
|
|
return s->flags & flags;
|
|
return false;
|
|
}
|
|
|
|
#ifdef CONFIG_SLAB_OBJ_EXT
|
|
|
|
/*
|
|
* slab_obj_exts - get the pointer to the slab object extension vector
|
|
* associated with a slab.
|
|
* @slab: a pointer to the slab struct
|
|
*
|
|
* Returns a pointer to the object extension vector associated with the slab,
|
|
* or NULL if no such vector has been associated yet.
|
|
*/
|
|
static inline struct slabobj_ext *slab_obj_exts(struct slab *slab)
|
|
{
|
|
unsigned long obj_exts = READ_ONCE(slab->obj_exts);
|
|
|
|
#ifdef CONFIG_MEMCG
|
|
VM_BUG_ON_PAGE(obj_exts && !(obj_exts & MEMCG_DATA_OBJEXTS),
|
|
slab_page(slab));
|
|
VM_BUG_ON_PAGE(obj_exts & MEMCG_DATA_KMEM, slab_page(slab));
|
|
#endif
|
|
return (struct slabobj_ext *)(obj_exts & ~OBJEXTS_FLAGS_MASK);
|
|
}
|
|
|
|
int alloc_slab_obj_exts(struct slab *slab, struct kmem_cache *s,
|
|
gfp_t gfp, bool new_slab);
|
|
|
|
#else /* CONFIG_SLAB_OBJ_EXT */
|
|
|
|
static inline struct slabobj_ext *slab_obj_exts(struct slab *slab)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
#endif /* CONFIG_SLAB_OBJ_EXT */
|
|
|
|
static inline enum node_stat_item cache_vmstat_idx(struct kmem_cache *s)
|
|
{
|
|
return (s->flags & SLAB_RECLAIM_ACCOUNT) ?
|
|
NR_SLAB_RECLAIMABLE_B : NR_SLAB_UNRECLAIMABLE_B;
|
|
}
|
|
|
|
#ifdef CONFIG_MEMCG_KMEM
|
|
bool __memcg_slab_post_alloc_hook(struct kmem_cache *s, struct list_lru *lru,
|
|
gfp_t flags, size_t size, void **p);
|
|
void __memcg_slab_free_hook(struct kmem_cache *s, struct slab *slab,
|
|
void **p, int objects, struct slabobj_ext *obj_exts);
|
|
#endif
|
|
|
|
size_t __ksize(const void *objp);
|
|
|
|
static inline size_t slab_ksize(const struct kmem_cache *s)
|
|
{
|
|
#ifdef CONFIG_SLUB_DEBUG
|
|
/*
|
|
* Debugging requires use of the padding between object
|
|
* and whatever may come after it.
|
|
*/
|
|
if (s->flags & (SLAB_RED_ZONE | SLAB_POISON))
|
|
return s->object_size;
|
|
#endif
|
|
if (s->flags & SLAB_KASAN)
|
|
return s->object_size;
|
|
/*
|
|
* If we have the need to store the freelist pointer
|
|
* back there or track user information then we can
|
|
* only use the space before that information.
|
|
*/
|
|
if (s->flags & (SLAB_TYPESAFE_BY_RCU | SLAB_STORE_USER))
|
|
return s->inuse;
|
|
/*
|
|
* Else we can use all the padding etc for the allocation
|
|
*/
|
|
return s->size;
|
|
}
|
|
|
|
#ifdef CONFIG_SLUB_DEBUG
|
|
void dump_unreclaimable_slab(void);
|
|
#else
|
|
static inline void dump_unreclaimable_slab(void)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
void ___cache_free(struct kmem_cache *cache, void *x, unsigned long addr);
|
|
|
|
#ifdef CONFIG_SLAB_FREELIST_RANDOM
|
|
int cache_random_seq_create(struct kmem_cache *cachep, unsigned int count,
|
|
gfp_t gfp);
|
|
void cache_random_seq_destroy(struct kmem_cache *cachep);
|
|
#else
|
|
static inline int cache_random_seq_create(struct kmem_cache *cachep,
|
|
unsigned int count, gfp_t gfp)
|
|
{
|
|
return 0;
|
|
}
|
|
static inline void cache_random_seq_destroy(struct kmem_cache *cachep) { }
|
|
#endif /* CONFIG_SLAB_FREELIST_RANDOM */
|
|
|
|
static inline bool slab_want_init_on_alloc(gfp_t flags, struct kmem_cache *c)
|
|
{
|
|
if (static_branch_maybe(CONFIG_INIT_ON_ALLOC_DEFAULT_ON,
|
|
&init_on_alloc)) {
|
|
if (c->ctor)
|
|
return false;
|
|
if (c->flags & (SLAB_TYPESAFE_BY_RCU | SLAB_POISON))
|
|
return flags & __GFP_ZERO;
|
|
return true;
|
|
}
|
|
return flags & __GFP_ZERO;
|
|
}
|
|
|
|
static inline bool slab_want_init_on_free(struct kmem_cache *c)
|
|
{
|
|
if (static_branch_maybe(CONFIG_INIT_ON_FREE_DEFAULT_ON,
|
|
&init_on_free))
|
|
return !(c->ctor ||
|
|
(c->flags & (SLAB_TYPESAFE_BY_RCU | SLAB_POISON)));
|
|
return false;
|
|
}
|
|
|
|
#if defined(CONFIG_DEBUG_FS) && defined(CONFIG_SLUB_DEBUG)
|
|
void debugfs_slab_release(struct kmem_cache *);
|
|
#else
|
|
static inline void debugfs_slab_release(struct kmem_cache *s) { }
|
|
#endif
|
|
|
|
#ifdef CONFIG_PRINTK
|
|
#define KS_ADDRS_COUNT 16
|
|
struct kmem_obj_info {
|
|
void *kp_ptr;
|
|
struct slab *kp_slab;
|
|
void *kp_objp;
|
|
unsigned long kp_data_offset;
|
|
struct kmem_cache *kp_slab_cache;
|
|
void *kp_ret;
|
|
void *kp_stack[KS_ADDRS_COUNT];
|
|
void *kp_free_stack[KS_ADDRS_COUNT];
|
|
};
|
|
void __kmem_obj_info(struct kmem_obj_info *kpp, void *object, struct slab *slab);
|
|
#endif
|
|
|
|
void __check_heap_object(const void *ptr, unsigned long n,
|
|
const struct slab *slab, bool to_user);
|
|
|
|
#ifdef CONFIG_SLUB_DEBUG
|
|
void skip_orig_size_check(struct kmem_cache *s, const void *object);
|
|
#endif
|
|
|
|
#endif /* MM_SLAB_H */
|