From: Michal Hocko <mhocko@kernel.org>
To: <linux-mm@kvack.org>
Cc: 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: [PATCH 0/7] vm, vmscan: enahance vmscan tracepoints
Date: Wed, 28 Dec 2016 16:30:25 +0100 [thread overview]
Message-ID: <20161228153032.10821-1-mhocko@kernel.org> (raw)
Hi,
while debugging [1] I've realized that there is some room for
improvements in the tracepoints set we offer currently. I had hard times
to make any conclusion from the existing ones. The resulting problem
turned out to be active list aging [2] and we are missing at least two
tracepoints to debug such a problem.
Some existing tracepoints could export more information to see _why_ the
reclaim progress cannot be made not only _how much_ we could reclaim.
The later could be seen quite reasonably from the vmstat counters
already. It can be argued that we are showing too many implementation
details in those tracepoints but I consider them way too lowlevel
already to be usable by any kernel independent userspace. I would be
_really_ surprised if anything but debugging tools have used them.
Any feedback is highly appreciated.
[1] http://lkml.kernel.org/r/20161215225702.GA27944@boerne.fritz.box
[2] http://lkml.kernel.org/r/20161223105157.GB23109@dhcp22.suse.cz
WARNING: multiple messages have this Message-ID (diff)
From: Michal Hocko <mhocko@kernel.org>
To: linux-mm@kvack.org
Cc: 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: [PATCH 0/7] vm, vmscan: enahance vmscan tracepoints
Date: Wed, 28 Dec 2016 16:30:25 +0100 [thread overview]
Message-ID: <20161228153032.10821-1-mhocko@kernel.org> (raw)
Hi,
while debugging [1] I've realized that there is some room for
improvements in the tracepoints set we offer currently. I had hard times
to make any conclusion from the existing ones. The resulting problem
turned out to be active list aging [2] and we are missing at least two
tracepoints to debug such a problem.
Some existing tracepoints could export more information to see _why_ the
reclaim progress cannot be made not only _how much_ we could reclaim.
The later could be seen quite reasonably from the vmstat counters
already. It can be argued that we are showing too many implementation
details in those tracepoints but I consider them way too lowlevel
already to be usable by any kernel independent userspace. I would be
_really_ surprised if anything but debugging tools have used them.
Any feedback is highly appreciated.
[1] http://lkml.kernel.org/r/20161215225702.GA27944@boerne.fritz.box
[2] http://lkml.kernel.org/r/20161223105157.GB23109@dhcp22.suse.cz
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next reply other threads:[~2016-12-28 15:30 UTC|newest]
Thread overview: 96+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-28 15:30 Michal Hocko [this message]
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
2016-12-28 15:30 ` Michal Hocko
2016-12-29 7:33 ` Hillf Danton
2016-12-29 7:33 ` Hillf Danton
2016-12-28 15:30 ` [PATCH 2/7] mm, vmscan: add active list aging tracepoint Michal Hocko
2016-12-28 15:30 ` Michal Hocko
2016-12-29 5:33 ` Minchan Kim
2016-12-29 5:33 ` Minchan Kim
2016-12-29 7:52 ` Michal Hocko
2016-12-29 7:52 ` Michal Hocko
2016-12-30 1:48 ` Minchan Kim
2016-12-30 1:48 ` Minchan Kim
2016-12-30 9:26 ` Michal Hocko
2016-12-30 9:26 ` Michal Hocko
2016-12-30 9:38 ` Hillf Danton
2016-12-30 9:38 ` Hillf Danton
2016-12-30 16:04 ` Minchan Kim
2016-12-30 16:04 ` Minchan Kim
2016-12-30 16:37 ` Michal Hocko
2016-12-30 16:37 ` Michal Hocko
2016-12-30 17:30 ` Michal Hocko
2016-12-30 17:30 ` Michal Hocko
2017-01-03 5:03 ` Minchan Kim
2017-01-03 5:03 ` Minchan Kim
2017-01-03 8:21 ` Michal Hocko
2017-01-03 8:21 ` Michal Hocko
2017-01-04 5:07 ` Minchan Kim
2017-01-04 5:07 ` Minchan Kim
2017-01-04 7:28 ` Vlastimil Babka
2017-01-04 7:28 ` Vlastimil Babka
2017-01-04 7:50 ` Michal Hocko
2017-01-04 7:50 ` Michal Hocko
2016-12-29 7:44 ` Hillf Danton
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
2016-12-28 15:30 ` Michal Hocko
2016-12-29 5:53 ` Minchan Kim
2016-12-29 5:53 ` Minchan Kim
2016-12-29 7:49 ` Hillf Danton
2016-12-29 7:49 ` Hillf Danton
2017-01-03 17:21 ` Vlastimil Babka
2017-01-03 17:21 ` Vlastimil Babka
2017-01-03 20:43 ` Michal Hocko
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 15:30 ` Michal Hocko
2016-12-28 15:50 ` Nikolay Borisov
2016-12-28 15:50 ` Nikolay Borisov
2016-12-28 16:00 ` Michal Hocko
2016-12-28 16:00 ` Michal Hocko
2016-12-28 16:40 ` Nikolay Borisov
2016-12-28 16:40 ` Nikolay Borisov
2016-12-28 16:49 ` Michal Hocko
2016-12-28 16:49 ` Michal Hocko
2016-12-29 6:02 ` Minchan Kim
2016-12-29 6:02 ` Minchan Kim
2016-12-29 7:56 ` Michal Hocko
2016-12-29 7:56 ` Michal Hocko
2016-12-30 1:56 ` Minchan Kim
2016-12-30 1:56 ` Minchan Kim
2016-12-30 9:33 ` Michal Hocko
2016-12-30 9:33 ` Michal Hocko
2016-12-29 7:53 ` Hillf Danton
2016-12-29 7:53 ` Hillf Danton
2017-01-03 17:08 ` Vlastimil Babka
2017-01-03 17:08 ` Vlastimil Babka
2017-01-03 20:47 ` Michal Hocko
2017-01-03 20:47 ` Michal Hocko
2017-01-03 20:52 ` Michal Hocko
2017-01-03 20:52 ` Michal Hocko
2017-01-03 21:24 ` Michal Hocko
2017-01-03 21:24 ` Michal Hocko
2017-01-03 21:40 ` Vlastimil Babka
2017-01-03 21:40 ` Vlastimil Babka
2017-01-03 21:48 ` Michal Hocko
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
2016-12-28 15:30 ` Michal Hocko
2016-12-29 8:00 ` Hillf Danton
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
2016-12-28 15:30 ` Michal Hocko
2016-12-29 8:05 ` Hillf Danton
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
2016-12-28 15:30 ` Michal Hocko
2016-12-29 8:19 ` Hillf Danton
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 9:11 ` Mel Gorman
2016-12-30 9:36 ` Michal Hocko
2016-12-30 9:36 ` Michal Hocko
2016-12-30 10:20 ` Mel Gorman
2016-12-30 10:20 ` Mel Gorman
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