Messages in this thread Patch in this message | | | From | John Stultz <> | Subject | [PATCH 14/14] vrange: Add vmstat counter about purged page | Date | Wed, 2 Oct 2013 17:51:43 -0700 |
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From: Minchan Kim <minchan@kernel.org>
This patch adds the number of purged page in vmstat so admin can see how many of volatile pages are discarded by VM until now.
Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Android Kernel Team <kernel-team@android.com> Cc: Robert Love <rlove@google.com> Cc: Mel Gorman <mel@csn.ul.ie> Cc: Hugh Dickins <hughd@google.com> Cc: Dave Hansen <dave.hansen@intel.com> Cc: Rik van Riel <riel@redhat.com> Cc: Dmitry Adamushko <dmitry.adamushko@gmail.com> Cc: Dave Chinner <david@fromorbit.com> Cc: Neil Brown <neilb@suse.de> Cc: Andrea Righi <andrea@betterlinux.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Cc: Mike Hommey <mh@glandium.org> Cc: Taras Glek <tglek@mozilla.com> Cc: Dhaval Giani <dhaval.giani@gmail.com> Cc: Jan Kara <jack@suse.cz> Cc: KOSAKI Motohiro <kosaki.motohiro@gmail.com> Cc: Michel Lespinasse <walken@google.com> Cc: Rob Clark <robdclark@gmail.com> Cc: Minchan Kim <minchan@kernel.org> Cc: linux-mm@kvack.org <linux-mm@kvack.org> Signed-off-by: Minchan Kim <minchan@kernel.org> Signed-off-by: John Stultz <john.stultz@linaro.org> --- include/linux/vm_event_item.h | 2 ++ mm/vmstat.c | 2 ++ mm/vrange.c | 10 ++++++++++ 3 files changed, 14 insertions(+)
diff --git a/include/linux/vm_event_item.h b/include/linux/vm_event_item.h index bd6cf61..c4aea92 100644 --- a/include/linux/vm_event_item.h +++ b/include/linux/vm_event_item.h @@ -25,6 +25,8 @@ enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT, FOR_ALL_ZONES(PGALLOC), PGFREE, PGACTIVATE, PGDEACTIVATE, PGFAULT, PGMAJFAULT, + PGDISCARD_DIRECT, + PGDISCARD_KSWAPD, FOR_ALL_ZONES(PGREFILL), FOR_ALL_ZONES(PGSTEAL_KSWAPD), FOR_ALL_ZONES(PGSTEAL_DIRECT), diff --git a/mm/vmstat.c b/mm/vmstat.c index 20c2ef4..4f35f46 100644 --- a/mm/vmstat.c +++ b/mm/vmstat.c @@ -756,6 +756,8 @@ const char * const vmstat_text[] = { "pgfault", "pgmajfault", + "pgdiscard_direct", + "pgdiscard_kswapd", TEXTS_FOR_ZONES("pgrefill") TEXTS_FOR_ZONES("pgsteal_kswapd") diff --git a/mm/vrange.c b/mm/vrange.c index c30e3dd..8931fab 100644 --- a/mm/vrange.c +++ b/mm/vrange.c @@ -894,6 +894,10 @@ int discard_vpage(struct page *page) if (page_freeze_refs(page, 1)) { unlock_page(page); + if (current_is_kswapd()) + count_vm_event(PGDISCARD_KSWAPD); + else + count_vm_event(PGDISCARD_DIRECT); return 0; } } @@ -1144,6 +1148,12 @@ static int discard_vrange(struct vrange *vrange) ret = __discard_vrange_file(mapping, vrange, &nr_discard); } + if (!ret) { + if (current_is_kswapd()) + count_vm_events(PGDISCARD_KSWAPD, nr_discard); + else + count_vm_events(PGDISCARD_DIRECT, nr_discard); + } out: __vroot_put(vroot); return nr_discard; -- 1.8.1.2
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