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Mon, 08 Mar 2021 16:11:48 -0800 (PST) MIME-Version: 1.0 References: <20210304235949.7922C1C3@viggo.jf.intel.com> <20210305000000.48BA4A97@viggo.jf.intel.com> In-Reply-To: <20210305000000.48BA4A97@viggo.jf.intel.com> From: Yang Shi Date: Mon, 8 Mar 2021 16:11:36 -0800 Message-ID: Subject: Re: [PATCH 06/10] mm/vmscan: add page demotion counter To: Dave Hansen Cc: Linux Kernel Mailing List , Linux MM , Yang Shi , David Rientjes , Huang Ying , Dan Williams , David Hildenbrand , Oscar Salvador Content-Type: text/plain; charset="UTF-8" X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 689E2E0011DD X-Stat-Signature: onwpibrchrukw885ef15ps5u6ku91h3a Received-SPF: none (gmail.com>: No applicable sender policy available) receiver=imf30; identity=mailfrom; envelope-from=""; helo=mail-ej1-f46.google.com; client-ip=209.85.218.46 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1615248704-97217 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Thu, Mar 4, 2021 at 4:01 PM Dave Hansen wrote: > > > From: Yang Shi > > 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 > Signed-off-by: Dave Hansen > Cc: David Rientjes > Cc: Huang Ying > Cc: Dan Williams > Cc: David Hildenbrand > Cc: osalvador > > -- > > Changes since 202010: > * remove unused scan-control 'demoted' field Reviewed-by: Yang Shi > --- > > b/include/linux/vm_event_item.h | 2 ++ > b/mm/vmscan.c | 5 +++++ > b/mm/vmstat.c | 2 ++ > 3 files changed, 9 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 2021-03-04 15:35:57.698806425 -0800 > +++ b/include/linux/vm_event_item.h 2021-03-04 15:35:57.719806425 -0800 > @@ -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 2021-03-04 15:35:57.700806425 -0800 > +++ b/mm/vmscan.c 2021-03-04 15:35:57.724806425 -0800 > @@ -1118,6 +1118,11 @@ 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 2021-03-04 15:35:57.708806425 -0800 > +++ b/mm/vmstat.c 2021-03-04 15:35:57.726806425 -0800 > @@ -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", > _ >