From: Michal Hocko <mhocko@kernel.org>
To: Minchan Kim <minchan@kernel.org>
Cc: Hillf Danton <hillf.zj@alibaba-inc.com>,
linux-mm@kvack.org, Andrew Morton <akpm@linux-foundation.org>,
Mel Gorman <mgorman@suse.de>,
Johannes Weiner <hannes@cmpxchg.org>,
Vlastimil Babka <vbabka@suse.cz>, Rik van Riel <riel@redhat.com>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 2/7] mm, vmscan: add active list aging tracepoint
Date: Fri, 30 Dec 2016 18:30:24 +0100 [thread overview]
Message-ID: <20161230173023.GA4962@dhcp22.suse.cz> (raw)
In-Reply-To: <20161230163742.GK13301@dhcp22.suse.cz>
On Fri 30-12-16 17:37:42, Michal Hocko wrote:
> On Sat 31-12-16 01:04:56, Minchan Kim wrote:
[...]
> > > - nr_rotated pages which tells us that we are hitting referenced
> > > pages which are deactivated. If this is a large part of the
> > > reported nr_deactivated pages then the active list is too small
> >
> > It might be but not exactly. If your goal is to know LRU size, it can be
> > done in get_scan_count. I tend to agree LRU size is helpful for
> > performance analysis because decreased LRU size signals memory shortage
> > then performance drop.
>
> No, I am not really interested in the exact size but rather to allow to
> find whether we are aging the active list too early...
But thinking about that some more, maybe sticking with the nr_rotated
terminology is rather confusing and displaying the value as nr_referenced
would be more clear.
--
Michal Hocko
SUSE Labs
next prev parent reply other threads:[~2016-12-30 17:30 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-28 15:30 [PATCH 0/7] vm, vmscan: enahance vmscan tracepoints Michal Hocko
2016-12-28 15:30 ` [PATCH 1/7] mm, vmscan: remove unused mm_vmscan_memcg_isolate Michal Hocko
2016-12-29 7:33 ` Hillf Danton
2016-12-28 15:30 ` [PATCH 2/7] mm, vmscan: add active list aging tracepoint Michal Hocko
2016-12-29 5:33 ` Minchan Kim
2016-12-29 7:52 ` Michal Hocko
2016-12-30 1:48 ` Minchan Kim
2016-12-30 9:26 ` Michal Hocko
2016-12-30 9:38 ` Hillf Danton
2016-12-30 16:04 ` Minchan Kim
2016-12-30 16:37 ` Michal Hocko
2016-12-30 17:30 ` Michal Hocko [this message]
2017-01-03 5:03 ` Minchan Kim
2017-01-03 8:21 ` Michal Hocko
2017-01-04 5:07 ` Minchan Kim
2017-01-04 7:28 ` Vlastimil Babka
2017-01-04 7:50 ` Michal Hocko
2016-12-29 7:44 ` Hillf Danton
2016-12-28 15:30 ` [PATCH 3/7] mm, vmscan: show the number of skipped pages in mm_vmscan_lru_isolate Michal Hocko
2016-12-29 5:53 ` Minchan Kim
2016-12-29 7:49 ` Hillf Danton
2017-01-03 17:21 ` Vlastimil Babka
2017-01-03 20:43 ` Michal Hocko
2016-12-28 15:30 ` [PATCH 4/7] mm, vmscan: show LRU name in mm_vmscan_lru_isolate tracepoint Michal Hocko
2016-12-28 15:50 ` Nikolay Borisov
2016-12-28 16:00 ` Michal Hocko
2016-12-28 16:40 ` Nikolay Borisov
2016-12-28 16:49 ` Michal Hocko
2016-12-29 6:02 ` Minchan Kim
2016-12-29 7:56 ` Michal Hocko
2016-12-30 1:56 ` Minchan Kim
2016-12-30 9:33 ` Michal Hocko
2016-12-29 7:53 ` Hillf Danton
2017-01-03 17:08 ` Vlastimil Babka
2017-01-03 20:47 ` Michal Hocko
2017-01-03 20:52 ` Michal Hocko
2017-01-03 21:24 ` Michal Hocko
2017-01-03 21:40 ` Vlastimil Babka
2017-01-03 21:48 ` Michal Hocko
2016-12-28 15:30 ` [PATCH 5/7] mm, vmscan: extract shrink_page_list reclaim counters into a struct Michal Hocko
2016-12-29 8:00 ` Hillf Danton
2016-12-28 15:30 ` [PATCH 6/7] mm, vmscan: enhance mm_vmscan_lru_shrink_inactive tracepoint Michal Hocko
2016-12-29 8:05 ` Hillf Danton
2016-12-28 15:30 ` [PATCH 7/7] mm, vmscan: add mm_vmscan_inactive_list_is_low tracepoint Michal Hocko
2016-12-29 8:19 ` Hillf Danton
2016-12-30 9:11 ` [PATCH 0/7] vm, vmscan: enahance vmscan tracepoints Mel Gorman
2016-12-30 9:36 ` Michal Hocko
2016-12-30 10:20 ` Mel Gorman
2017-01-04 10:19 [PATCH 0/7 v2] " Michal Hocko
2017-01-04 10:19 ` [PATCH 2/7] mm, vmscan: add active list aging tracepoint Michal Hocko
2017-01-04 12:52 ` Vlastimil Babka
2017-01-04 13:16 ` Michal Hocko
2017-01-04 13:34 ` Vlastimil Babka
2017-01-04 13:52 ` Michal Hocko
2017-01-05 5:41 ` Minchan Kim
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