diff options
| author | Baolin Wang <baolin.wang@linux.alibaba.com> | 2026-02-09 22:07:27 +0800 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2026-02-12 15:43:00 -0800 |
| commit | 07f440c23a197616f7b7607b98b9427da23f9f6f (patch) | |
| tree | 1c018e21ed690b38cbacef1bd8e14424a876d18d /arch | |
| parent | 6f0e1142173a54b8a18c59fc3cbae3b31ee423d9 (diff) | |
arm64: mm: implement the architecture-specific clear_flush_young_ptes()
Implement the Arm64 architecture-specific clear_flush_young_ptes() to
enable batched checking of young flags and TLB flushing, improving
performance during large folio reclamation.
Performance testing:
Allocate 10G clean file-backed folios by mmap() in a memory cgroup, and
try to reclaim 8G file-backed folios via the memory.reclaim interface. I
can observe 33% performance improvement on my Arm64 32-core server (and
10%+ improvement on my X86 machine). Meanwhile, the hotspot
folio_check_references() dropped from approximately 35% to around 5%.
W/o patchset:
real 0m1.518s
user 0m0.000s
sys 0m1.518s
W/ patchset:
real 0m1.018s
user 0m0.000s
sys 0m1.018s
Link: https://lkml.kernel.org/r/ce749fbae3e900e733fa104a16fcb3ca9fe4f9bd.1770645603.git.baolin.wang@linux.alibaba.com
Signed-off-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Reviewed-by: Ryan Roberts <ryan.roberts@arm.com>
Reviewed-by: David Hildenbrand (Arm) <david@kernel.org>
Cc: Barry Song <baohua@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Harry Yoo <harry.yoo@oracle.com>
Cc: Jann Horn <jannh@google.com>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Rik van Riel <riel@surriel.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm64/include/asm/pgtable.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h index 3dabf5ea17fa..a17eb8a76788 100644 --- a/arch/arm64/include/asm/pgtable.h +++ b/arch/arm64/include/asm/pgtable.h @@ -1838,6 +1838,17 @@ static inline int ptep_clear_flush_young(struct vm_area_struct *vma, return contpte_clear_flush_young_ptes(vma, addr, ptep, 1); } +#define clear_flush_young_ptes clear_flush_young_ptes +static inline int clear_flush_young_ptes(struct vm_area_struct *vma, + unsigned long addr, pte_t *ptep, + unsigned int nr) +{ + if (likely(nr == 1 && !pte_cont(__ptep_get(ptep)))) + return __ptep_clear_flush_young(vma, addr, ptep); + + return contpte_clear_flush_young_ptes(vma, addr, ptep, nr); +} + #define wrprotect_ptes wrprotect_ptes static __always_inline void wrprotect_ptes(struct mm_struct *mm, unsigned long addr, pte_t *ptep, unsigned int nr) |