lkml.org 
[lkml]   [2020]   [Aug]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH 4/4] mm: Add PGREUSE counter
    Date
    This accounts for wp_page_reuse() case, where we reused a page for COW.

    Signed-off-by: Peter Xu <peterx@redhat.com>
    ---
    include/linux/vm_event_item.h | 1 +
    mm/memory.c | 1 +
    mm/vmstat.c | 1 +
    3 files changed, 3 insertions(+)

    diff --git a/include/linux/vm_event_item.h b/include/linux/vm_event_item.h
    index 2e6ca53b9bbd..18e75974d4e3 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 cb9006189d22..148eafb8cbb1 100644
    --- a/mm/memory.c
    +++ b/mm/memory.c
    @@ -2622,6 +2622,7 @@ 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 e670f910cd2f..4f7b4ee6aa12 100644
    --- a/mm/vmstat.c
    +++ b/mm/vmstat.c
    @@ -1241,6 +1241,7 @@ const char * const vmstat_text[] = {
    "pglazyfreed",

    "pgrefill",
    + "pgreuse",
    "pgsteal_kswapd",
    "pgsteal_direct",
    "pgscan_kswapd",
    --
    2.26.2
    \
     
     \ /
      Last update: 2020-08-22 01:50    [W:4.743 / U:0.052 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site