From: Christoph Lameter <cl@linux.com>
To: Anton Vorontsov <anton.vorontsov@linaro.org>
Cc: Pekka Enberg <penberg@kernel.org>,
Leonid Moiseichuk <leonid.moiseichuk@nokia.com>,
KOSAKI Motohiro <kosaki.motohiro@gmail.com>,
Minchan Kim <minchan@kernel.org>,
Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
John Stultz <john.stultz@linaro.org>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
linaro-kernel@lists.linaro.org, patches@linaro.org,
kernel-team@android.com
Subject: Re: [PATCH 3/5] vmevent: Refresh vmstats before sampling
Date: Tue, 5 Jun 2012 09:36:57 -0500 (CDT) [thread overview]
Message-ID: <alpine.DEB.2.00.1206050934330.26918@router.home> (raw)
In-Reply-To: <1338553446-22292-3-git-send-email-anton.vorontsov@linaro.org>
On Fri, 1 Jun 2012, Anton Vorontsov wrote:
> On SMP, kernel updates vmstats only once per second, which makes vmevent
> unusable. Let's fix it by updating vmstats before sampling.
Well this may increase your accuracy but there is no guarantee that an
update to vm counters will not happen immediately after you have refreshed
the counters for one processor or the other.
Also please consider the impact that a IPI broadcast will have on latency
of other processors and to the function that is currently executing.
We just went through a round of getting rid of IPI broadcast because they
create OS noise on processors.
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next prev parent reply other threads:[~2012-06-05 14:37 UTC|newest]
Thread overview: 94+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-01 13:24 [PATCH 0/3] vmevent: Implement 'low memory' attribute Anton Vorontsov
2012-05-01 13:25 ` [PATCH 1/3] vmevent: Implement equal-to attribute state Anton Vorontsov
2012-05-01 13:25 ` [PATCH 2/3] vmevent: Pass attr argument to sampling functions Anton Vorontsov
2012-05-01 13:26 ` [PATCH 3/3] vmevent: Implement special low-memory attribute Anton Vorontsov
2012-05-03 10:33 ` Pekka Enberg
2012-05-04 4:26 ` Minchan Kim
2012-05-04 7:38 ` Anton Vorontsov
2012-05-07 7:14 ` Pekka Enberg
2012-05-07 8:26 ` KOSAKI Motohiro
2012-05-07 12:15 ` Anton Vorontsov
2012-05-07 19:19 ` KOSAKI Motohiro
2012-05-08 0:31 ` Anton Vorontsov
2012-05-08 5:20 ` Pekka Enberg
2012-05-08 5:42 ` KOSAKI Motohiro
2012-05-08 5:53 ` Pekka Enberg
2012-05-08 7:11 ` KOSAKI Motohiro
2012-05-08 7:36 ` Pekka Enberg
2012-05-08 7:50 ` KOSAKI Motohiro
2012-05-08 8:03 ` Pekka Enberg
2012-05-08 9:15 ` leonid.moiseichuk
2012-05-08 9:19 ` Pekka Enberg
2012-05-08 10:38 ` leonid.moiseichuk
2012-06-01 12:21 ` [PATCH 0/5] Some vmevent fixes Anton Vorontsov
2012-06-01 12:24 ` [PATCH 1/5] vmstat: Implement refresh_vm_stats() Anton Vorontsov
2012-06-05 14:30 ` Christoph Lameter
2012-06-08 3:17 ` KOSAKI Motohiro
2012-06-01 12:24 ` [PATCH 2/5] vmevent: Convert from deferred timer to deferred work Anton Vorontsov
2012-06-08 3:25 ` KOSAKI Motohiro
2012-06-08 6:58 ` Anton Vorontsov
2012-06-08 7:03 ` Pekka Enberg
2012-06-08 8:07 ` Anton Vorontsov
2012-06-08 7:05 ` leonid.moiseichuk
2012-06-08 7:10 ` KOSAKI Motohiro
2012-06-08 7:18 ` leonid.moiseichuk
2012-06-08 7:23 ` KOSAKI Motohiro
2012-06-08 7:28 ` leonid.moiseichuk
2012-06-08 7:33 ` KOSAKI Motohiro
2012-06-08 7:49 ` leonid.moiseichuk
2012-06-08 7:58 ` Anton Vorontsov
2012-06-08 8:16 ` leonid.moiseichuk
2012-06-08 8:41 ` Anton Vorontsov
2012-06-08 8:57 ` leonid.moiseichuk
2012-06-08 10:35 ` Anton Vorontsov
2012-06-08 11:03 ` leonid.moiseichuk
2012-06-08 12:13 ` Anton Vorontsov
2012-06-08 12:25 ` leonid.moiseichuk
2012-06-01 12:24 ` [PATCH 3/5] vmevent: Refresh vmstats before sampling Anton Vorontsov
2012-06-05 14:36 ` Christoph Lameter [this message]
2012-06-01 12:24 ` [PATCH 4/5] vmevent: Hide meaningful names from the user-visible header Anton Vorontsov
2012-06-01 12:24 ` [PATCH 5/5] vmevent: Rename one-shot mode to edge trigger mode Anton Vorontsov
2012-06-03 18:26 ` [PATCH 0/5] Some vmevent fixes Pekka Enberg
2012-06-04 8:45 ` Minchan Kim
2012-06-04 9:20 ` Pekka Enberg
2012-06-04 12:23 ` Minchan Kim
2012-06-04 11:38 ` Anton Vorontsov
2012-06-04 12:17 ` Minchan Kim
2012-06-04 13:35 ` Anton Vorontsov
2012-06-05 7:53 ` Pekka Enberg
2012-06-05 8:00 ` Minchan Kim
2012-06-05 8:01 ` Pekka Enberg
2012-06-05 8:16 ` leonid.moiseichuk
2012-06-05 8:27 ` Minchan Kim
2012-06-08 3:35 ` KOSAKI Motohiro
2012-06-04 20:05 ` KOSAKI Motohiro
2012-06-04 22:39 ` Anton Vorontsov
2012-06-08 3:45 ` KOSAKI Motohiro
2012-06-08 6:57 ` Pekka Enberg
2012-06-05 7:47 ` Pekka Enberg
2012-06-05 8:39 ` Anton Vorontsov
2012-06-07 2:41 ` Minchan Kim
2012-06-08 7:49 ` Anton Vorontsov
2012-06-08 8:43 ` Minchan Kim
2012-06-08 8:48 ` Pekka Enberg
2012-06-08 9:12 ` leonid.moiseichuk
2012-06-08 9:45 ` Anton Vorontsov
2012-06-08 10:42 ` Minchan Kim
2012-06-08 11:14 ` Anton Vorontsov
2012-06-11 4:50 ` Minchan Kim
2012-06-05 7:52 ` Pekka Enberg
2012-06-08 3:55 ` KOSAKI Motohiro
2012-06-08 6:54 ` Pekka Enberg
2012-06-08 6:57 ` KOSAKI Motohiro
2012-06-08 6:59 ` Pekka Enberg
2012-06-04 19:50 ` KOSAKI Motohiro
2012-05-08 8:32 ` [PATCH 3/3] vmevent: Implement special low-memory attribute Minchan Kim
2012-05-08 9:27 ` Pekka Enberg
2012-06-05 14:40 ` Christoph Lameter
2012-05-08 6:58 ` Anton Vorontsov
2012-05-08 7:16 ` KOSAKI Motohiro
2012-05-08 8:13 ` Anton Vorontsov
2012-05-08 8:21 ` Anton Vorontsov
2012-05-03 8:10 ` [PATCH 0/3] vmevent: Implement 'low memory' attribute Pekka Enberg
2012-05-03 9:44 ` Anton Vorontsov
2012-05-03 10:54 ` Pekka Enberg
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