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Date: Tue, 06 Oct 2020 13:51:21 -0700 From: Dave Hansen <dave.hansen@...ux.intel.com> To: linux-kernel@...r.kernel.org Cc: Dave Hansen <dave.hansen@...ux.intel.com>, yang.shi@...ux.alibaba.com, rientjes@...gle.com, ying.huang@...el.com, dan.j.williams@...el.com Subject: [RFC][PATCH 09/12] mm/vmscan: add page demotion counter From: Yang Shi <yang.shi@...ux.alibaba.com> Account the number of demoted pages into reclaim_state->nr_demoted. Add pgdemote_kswapd and pgdemote_direct VM counters showed in /proc/vmstat. [ daveh: - __count_vm_events() a bit, and made them look at the THP size directly rather than getting data from migrate_pages() ] Signed-off-by: Yang Shi <yang.shi@...ux.alibaba.com> Signed-off-by: Dave Hansen <dave.hansen@...ux.intel.com> Cc: David Rientjes <rientjes@...gle.com> Cc: Huang Ying <ying.huang@...el.com> Cc: Dan Williams <dan.j.williams@...el.com> --- b/include/linux/vm_event_item.h | 2 ++ b/mm/vmscan.c | 6 ++++++ b/mm/vmstat.c | 2 ++ 3 files changed, 10 insertions(+) diff -puN include/linux/vm_event_item.h~mm-vmscan-add-page-demotion-counter include/linux/vm_event_item.h --- a/include/linux/vm_event_item.h~mm-vmscan-add-page-demotion-counter 2020-10-06 13:39:30.204818419 -0700 +++ b/include/linux/vm_event_item.h 2020-10-06 13:39:30.212818419 -0700 @@ -33,6 +33,8 @@ enum vm_event_item { PGPGIN, PGPGOUT, PS PGREUSE, PGSTEAL_KSWAPD, PGSTEAL_DIRECT, + PGDEMOTE_KSWAPD, + PGDEMOTE_DIRECT, PGSCAN_KSWAPD, PGSCAN_DIRECT, PGSCAN_DIRECT_THROTTLE, diff -puN mm/vmscan.c~mm-vmscan-add-page-demotion-counter mm/vmscan.c --- a/mm/vmscan.c~mm-vmscan-add-page-demotion-counter 2020-10-06 13:39:30.206818419 -0700 +++ b/mm/vmscan.c 2020-10-06 13:39:30.213818419 -0700 @@ -147,6 +147,7 @@ struct scan_control { unsigned int immediate; unsigned int file_taken; unsigned int taken; + unsigned int demoted; } nr; /* for recording the reclaimed slab by now */ @@ -1134,6 +1135,11 @@ static unsigned int demote_page_list(str target_nid, MIGRATE_ASYNC, MR_DEMOTION, &nr_succeeded); + if (current_is_kswapd()) + __count_vm_events(PGDEMOTE_KSWAPD, nr_succeeded); + else + __count_vm_events(PGDEMOTE_DIRECT, nr_succeeded); + return nr_succeeded; } diff -puN mm/vmstat.c~mm-vmscan-add-page-demotion-counter mm/vmstat.c --- a/mm/vmstat.c~mm-vmscan-add-page-demotion-counter 2020-10-06 13:39:30.208818419 -0700 +++ b/mm/vmstat.c 2020-10-06 13:39:30.214818419 -0700 @@ -1244,6 +1244,8 @@ const char * const vmstat_text[] = { "pgreuse", "pgsteal_kswapd", "pgsteal_direct", + "pgdemote_kswapd", + "pgdemote_direct", "pgscan_kswapd", "pgscan_direct", "pgscan_direct_throttle", _
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