mm: optimise vmf_anon_prepare() for VMAs without an anon_vma

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If the mmap_lock can be taken for read, we can call __anon_vma_prepare()
while holding it, saving ourselves a trip back through the fault handler.

Link: https://lkml.kernel.org/r/20240426144506.1290619-5-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Jann Horn <jannh@google.com>
Reviewed-by: Suren Baghdasaryan <surenb@google.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

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Matthew Wilcox (Oracle) 2024-04-26 15:45:03 +01:00 • committed by Andrew Morton

parent 73b4a0cd82

commit 737019cf6a

1 changed files with 9 additions and 4 deletions

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mm/memory.c

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