From: Peter Xu Date: Fri, 21 Aug 2020 23:49:58 +0000 (-0400) Subject: mm: Add PGREUSE counter X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=798a6b87ecd72828a6c6b5469aaa2032a57e92b7;p=linux.git mm: Add PGREUSE counter This accounts for wp_page_reuse() case, where we reused a page for COW. Signed-off-by: Peter Xu Signed-off-by: Linus Torvalds --- diff --git a/include/linux/vm_event_item.h b/include/linux/vm_event_item.h index 24fc7c3ae7d64..58d3f91baad15 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 56ae945c6845d..20d93001ef933 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 3fb23a21f6dd6..907a5045bfa3d 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",