admin/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2025-12-07 20:06:24 +00:00
Code Issues Packages Projects Releases Wiki Activity

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

Browse Source 
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>
This commit is contained in:
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
Download Patch File Download Diff File Expand all files Collapse all files

11
mm/madvise.c
View File

@@ -851,7 +851,8 @@ static int madvise_free_single_vma(struct madvise_behavior *madv_behavior,
* An interface that causes the system to free clean pages and flush
* dirty pages is already available as msync(MS_INVALIDATE).
*/
static long madvise_dontneed_single_vma(struct vm_area_struct *vma,
static long madvise_dontneed_single_vma(struct madvise_behavior *madv_behavior,
struct vm_area_struct *vma,
unsigned long start, unsigned long end)
{
struct zap_details details = {
@@ -859,7 +860,8 @@ static long madvise_dontneed_single_vma(struct vm_area_struct *vma,
.even_cows = true,
};
zap_page_range_single(vma, start, end - start, &details);
zap_page_range_single_batched(
madv_behavior->tlb, vma, start, end - start, &details);
return 0;
}
@@ -950,7 +952,8 @@ static long madvise_dontneed_free(struct vm_area_struct *vma,
}
if (behavior == MADV_DONTNEED || behavior == MADV_DONTNEED_LOCKED)
return madvise_dontneed_single_vma(vma, start, end);
return madvise_dontneed_single_vma(
madv_behavior, vma, start, end);
else if (behavior == MADV_FREE)
return madvise_free_single_vma(madv_behavior, vma, start, end);
else
@@ -1628,6 +1631,8 @@ static void madvise_unlock(struct mm_struct *mm, int behavior)
static bool madvise_batch_tlb_flush(int behavior)
{
switch (behavior) {
case MADV_DONTNEED:
case MADV_DONTNEED_LOCKED:
case MADV_FREE:
return true;
default: