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| author |   Peter Xu <peterx@redhat.com> | 2020-08-21 19:49:58 -0400 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2020-09-04 09:25:20 -0700 |
| commit | 798a6b87ecd72828a6c6b5469aaa2032a57e92b7 (patch) | |
| tree | 12c67139a23f97deb577f098b320c787c99a25b9 | |
| parent | mm/gup: Remove enfornced COW mechanism (diff) | |
| download | wireguard-linux-798a6b87ecd72828a6c6b5469aaa2032a57e92b7.tar.xz wireguard-linux-798a6b87ecd72828a6c6b5469aaa2032a57e92b7.zip | |
mm: Add PGREUSE counter
This accounts for wp_page_reuse() case, where we reused a page for COW.
Signed-off-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | include/linux/vm_event_item.h | 1 | ||||
| -rw-r--r-- | mm/memory.c | 1 | ||||
| -rw-r--r-- | mm/vmstat.c | 1 |
3 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/vm_event_item.h b/include/linux/vm_event_item.h index 24fc7c3ae7d6..58d3f91baad1 100644 --- a/include/linux/vm_event_item.h +++ b/include/linux/vm_event_item.h @@ -30,6 +30,7 @@ enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT, PGFAULT, PGMAJFAULT, PGLAZYFREED, PGREFILL, + PGREUSE, PGSTEAL_KSWAPD, PGSTEAL_DIRECT, PGSCAN_KSWAPD, diff --git a/mm/memory.c b/mm/memory.c index 56ae945c6845..20d93001ef93 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -2619,6 +2619,7 @@ static inline void wp_page_reuse(struct vm_fault *vmf) if (ptep_set_access_flags(vma, vmf->address, vmf->pte, entry, 1)) update_mmu_cache(vma, vmf->address, vmf->pte); pte_unmap_unlock(vmf->pte, vmf->ptl); + count_vm_event(PGREUSE); } /* diff --git a/mm/vmstat.c b/mm/vmstat.c index 3fb23a21f6dd..907a5045bfa3 100644 --- a/mm/vmstat.c +++ b/mm/vmstat.c @@ -1198,6 +1198,7 @@ const char * const vmstat_text[] = { "pglazyfreed", "pgrefill", + "pgreuse", "pgsteal_kswapd", "pgsteal_direct", "pgscan_kswapd", |