From: "Huang\, Ying" <ying.huang@intel.com>
To: Dave Hansen <dave.hansen@linux.intel.com>
Cc: <linux-kernel@vger.kernel.org>, <linux-mm@kvack.org>,
<yang.shi@linux.alibaba.com>, <rientjes@google.com>,
<dan.j.williams@intel.com>, <david@redhat.com>
Subject: Re: [RFC][PATCH 6/9] mm/vmscan: add page demotion counter
Date: Mon, 19 Oct 2020 15:37:55 +0800 [thread overview]
Message-ID: <87v9f6hdik.fsf@yhuang-dev.intel.com> (raw)
In-Reply-To: <20201007161747.FE7288F0@viggo.jf.intel.com> (Dave Hansen's message of "Wed, 7 Oct 2020 09:17:47 -0700")
Dave Hansen <dave.hansen@linux.intel.com> writes:
> From: Yang Shi <yang.shi@linux.alibaba.com>
>
> Account the number of demoted pages into reclaim_state->nr_demoted.
It appears that you don't add "nr_demoted" into struct reclaim_state.
> 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()
It appears that we get the data from migrate_pages() now.
> ]
>
> Signed-off-by: Yang Shi <yang.shi@linux.alibaba.com>
> Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
> Cc: David Rientjes <rientjes@google.com>
> Cc: Huang Ying <ying.huang@intel.com>
> Cc: Dan Williams <dan.j.williams@intel.com>
> Cc: David Hildenbrand <david@redhat.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 2020-10-07 09:15:32.171642439 -0700
> +++ b/include/linux/vm_event_item.h 2020-10-07 09:15:32.179642439 -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 2020-10-07 09:15:32.173642439 -0700
> +++ b/mm/vmscan.c 2020-10-07 09:15:32.180642439 -0700
> @@ -147,6 +147,7 @@ struct scan_control {
> unsigned int immediate;
> unsigned int file_taken;
> unsigned int taken;
> + unsigned int demoted;
It appears that this newly added field isn't used in the patch.
> } 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 2020-10-07 09:15:32.175642439 -0700
> +++ b/mm/vmstat.c 2020-10-07 09:15:32.181642439 -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",
> _
Best Regards,
Huang, Ying
next prev parent reply other threads:[~2020-10-19 7:38 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-07 16:17 [RFC][PATCH 0/9] [v4][RESEND] Migrate Pages in lieu of discard Dave Hansen
2020-10-07 16:17 ` [RFC][PATCH 1/9] mm/numa: node demotion data structure and lookup Dave Hansen
2020-10-07 16:17 ` [RFC][PATCH 2/9] mm/numa: automatically generate node migration order Dave Hansen
2020-10-07 16:17 ` [RFC][PATCH 3/9] mm/migrate: update migration order during on hotplug events Dave Hansen
2020-10-07 18:08 ` osalvador
2020-10-07 16:17 ` [RFC][PATCH 4/9] mm/migrate: make migrate_pages() return nr_succeeded Dave Hansen
2020-10-07 16:17 ` [RFC][PATCH 5/9] mm/migrate: demote pages during reclaim Dave Hansen
2020-10-27 15:29 ` Oscar Salvador
2020-10-27 16:53 ` Yang Shi
2020-10-07 16:17 ` [RFC][PATCH 6/9] mm/vmscan: add page demotion counter Dave Hansen
2020-10-19 7:37 ` Huang, Ying [this message]
2020-10-27 16:41 ` Yang Shi
2020-10-28 1:25 ` Huang, Ying
2020-10-07 16:17 ` [RFC][PATCH 7/9] mm/vmscan: Consider anonymous pages without swap Dave Hansen
2020-10-29 8:14 ` Oscar Salvador
2020-10-29 14:33 ` Dave Hansen
2020-10-29 15:57 ` Yang Shi
2020-10-29 19:08 ` osalvador
2020-10-29 19:30 ` Yang Shi
2020-10-07 16:17 ` [RFC][PATCH 8/9] mm/vmscan: never demote for memcg reclaim Dave Hansen
2020-10-07 16:17 ` [RFC][PATCH 9/9] mm/migrate: new zone_reclaim_mode to enable reclaim migration Dave Hansen
2020-10-12 21:30 ` [RFC][PATCH 0/9] [v4][RESEND] Migrate Pages in lieu of discard Yang Shi
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