diff options
| author | Barry Song <v-songbaohua@oppo.com> | 2024-03-29 20:37:50 +1300 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2024-04-25 20:56:30 -0700 |
| commit | 68dbcf4899f357c707c8bd42326533d729e8e8bb (patch) | |
| tree | 24c6a164043b07799135a5aa6d9ccec56824f78f | |
| parent | 34efe1c3b688944d9817a5faaab7aad870182c59 (diff) | |
mm: alloc_anon_folio: avoid doing vma_thp_gfp_mask in fallback cases
Fallback rates surpassing 90% have been observed on phones utilizing 64KiB
CONT-PTE mTHP. In these scenarios, when one out of every 16 PTEs fails to
allocate large folios, the remaining 15 PTEs fallback. Consequently,
invoking vma_thp_gfp_mask seems redundant in such cases. Furthermore,
abstaining from its use can also contribute to improved code readability.
Link: https://lkml.kernel.org/r/20240329073750.20012-1-21cnbao@gmail.com
Signed-off-by: Barry Song <v-songbaohua@oppo.com>
Reviewed-by: Zi Yan <ziy@nvidia.com>
Acked-by: Yu Zhao <yuzhao@google.com>
Reviewed-by: Ryan Roberts <ryan.roberts@arm.com>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: David Rientjes <rientjes@google.com>
Cc: "Huang, Ying" <ying.huang@intel.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Itaru Kitayama <itaru.kitayama@gmail.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Luis Chamberlain <mcgrof@kernel.org>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Yang Shi <shy828301@gmail.com>
Cc: Yin Fengwei <fengwei.yin@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
| -rw-r--r-- | mm/memory.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/mm/memory.c b/mm/memory.c index 80944acb5b4e..93eaeaf5ca9d 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -4358,6 +4358,9 @@ static struct folio *alloc_anon_folio(struct vm_fault *vmf) pte_unmap(pte); + if (!orders) + goto fallback; + /* Try allocating the highest of the remaining orders. */ gfp = vma_thp_gfp_mask(vma); while (orders) { |