mm/madvise: batch tlb flushes for MADV_DONTNEED[_LOCKED]

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MADV_DONTNEED[_LOCKED] handling for [process_]madvise() flushes tlb for
each vma of each address range.  Update the logic to do tlb flushes in a
batched way.  Initialize an mmu_gather object from do_madvise() and
vector_madvise(), which are the entry level functions for
[process_]madvise(), respectively.  And pass those objects to the function
for per-vma work, via madvise_behavior struct.  Make the per-vma logic not
flushes tlb on their own but just saves the tlb entries to the received
mmu_gather object.  For this internal logic change, make
zap_page_range_single_batched() non-static and use it directly from
madvise_dontneed_single_vma().  Finally, the entry level functions flush
the tlb entries that gathered for the entire user request, at once.

Link: https://lkml.kernel.org/r/20250410000022.1901-5-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

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SeongJae Park 2025-04-09 17:00:22 -07:00 • committed by Andrew Morton

parent de8efdf8cd

commit 43c4cfde7e

3 changed files with 13 additions and 5 deletions

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3

mm/internal.h

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11

mm/madvise.c

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4

mm/memory.c

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