From: Anton Vorontsov <anton.vorontsov@linaro.org>
To: KOSAKI Motohiro <kosaki.motohiro@gmail.com>
Cc: Pekka Enberg <penberg@kernel.org>,
Minchan Kim <minchan@kernel.org>,
Leonid Moiseichuk <leonid.moiseichuk@nokia.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 3/3] vmevent: Implement special low-memory attribute
Date: Tue, 8 May 2012 01:21:47 -0700 [thread overview]
Message-ID: <20120508082147.GA22425@lizard> (raw)
In-Reply-To: <20120508081305.GA20574@lizard>
On Tue, May 08, 2012 at 01:13:05AM -0700, Anton Vorontsov wrote:
> On Tue, May 08, 2012 at 03:16:59AM -0400, KOSAKI Motohiro wrote:
> [...]
> > >So, feel free to call me an idiot, but please expand your points a
> > >little bit or give a link to the discussion you're referring to?
> >
> > I don't think you are idiot. But I hope you test your patch before submitting.
> > That just don't work especially on x86. Because of, all x86 box have multiple zone
> > and summarized statistics (i.e. global_page_state() thing) don't work and can't
> > prevent oom nor swapping.
>
> Now I think I understand you: we don't take into account that e.g. DMA
> zone is not usable by the normal allocations, and so if we're basing our
> calculations on summarized stats, it is indeed possible to get an OOM
> in such a case.
Oops. Looking into it more, I think I was wrong here: kernel will surely
use pages from the DMA zone when we have no pages in normal zones.
So, I don't see how we can get OOM in that case.
Hm.
--
Anton Vorontsov
Email: cbouatmailru@gmail.com
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WARNING: multiple messages have this Message-ID (diff)
From: Anton Vorontsov <anton.vorontsov@linaro.org>
To: KOSAKI Motohiro <kosaki.motohiro@gmail.com>
Cc: Pekka Enberg <penberg@kernel.org>,
Minchan Kim <minchan@kernel.org>,
Leonid Moiseichuk <leonid.moiseichuk@nokia.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 3/3] vmevent: Implement special low-memory attribute
Date: Tue, 8 May 2012 01:21:47 -0700 [thread overview]
Message-ID: <20120508082147.GA22425@lizard> (raw)
In-Reply-To: <20120508081305.GA20574@lizard>
On Tue, May 08, 2012 at 01:13:05AM -0700, Anton Vorontsov wrote:
> On Tue, May 08, 2012 at 03:16:59AM -0400, KOSAKI Motohiro wrote:
> [...]
> > >So, feel free to call me an idiot, but please expand your points a
> > >little bit or give a link to the discussion you're referring to?
> >
> > I don't think you are idiot. But I hope you test your patch before submitting.
> > That just don't work especially on x86. Because of, all x86 box have multiple zone
> > and summarized statistics (i.e. global_page_state() thing) don't work and can't
> > prevent oom nor swapping.
>
> Now I think I understand you: we don't take into account that e.g. DMA
> zone is not usable by the normal allocations, and so if we're basing our
> calculations on summarized stats, it is indeed possible to get an OOM
> in such a case.
Oops. Looking into it more, I think I was wrong here: kernel will surely
use pages from the DMA zone when we have no pages in normal zones.
So, I don't see how we can get OOM in that case.
Hm.
--
Anton Vorontsov
Email: cbouatmailru@gmail.com
next prev parent reply other threads:[~2012-05-08 8:23 UTC|newest]
Thread overview: 188+ 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 13:24 ` Anton Vorontsov
2012-05-01 13:25 ` [PATCH 1/3] vmevent: Implement equal-to attribute state Anton Vorontsov
2012-05-01 13:25 ` Anton Vorontsov
2012-05-01 13:25 ` [PATCH 2/3] vmevent: Pass attr argument to sampling functions Anton Vorontsov
2012-05-01 13:25 ` Anton Vorontsov
2012-05-01 13:26 ` [PATCH 3/3] vmevent: Implement special low-memory attribute Anton Vorontsov
2012-05-01 13:26 ` Anton Vorontsov
2012-05-03 10:33 ` Pekka Enberg
2012-05-03 10:33 ` Pekka Enberg
2012-05-04 4:26 ` Minchan Kim
2012-05-04 4:26 ` Minchan Kim
2012-05-04 7:38 ` Anton Vorontsov
2012-05-04 7:38 ` Anton Vorontsov
2012-05-07 7:14 ` Pekka Enberg
2012-05-07 7:14 ` Pekka Enberg
2012-05-07 8:26 ` KOSAKI Motohiro
2012-05-07 8:26 ` KOSAKI Motohiro
2012-05-07 12:15 ` Anton Vorontsov
2012-05-07 12:15 ` Anton Vorontsov
2012-05-07 19:19 ` KOSAKI Motohiro
2012-05-07 19:19 ` KOSAKI Motohiro
2012-05-08 0:31 ` Anton Vorontsov
2012-05-08 0:31 ` Anton Vorontsov
2012-05-08 5:20 ` Pekka Enberg
2012-05-08 5:20 ` Pekka Enberg
2012-05-08 5:42 ` KOSAKI Motohiro
2012-05-08 5:42 ` KOSAKI Motohiro
2012-05-08 5:53 ` Pekka Enberg
2012-05-08 5:53 ` Pekka Enberg
2012-05-08 7:11 ` KOSAKI Motohiro
2012-05-08 7:11 ` KOSAKI Motohiro
2012-05-08 7:36 ` Pekka Enberg
2012-05-08 7:36 ` Pekka Enberg
2012-05-08 7:50 ` KOSAKI Motohiro
2012-05-08 7:50 ` KOSAKI Motohiro
2012-05-08 8:03 ` Pekka Enberg
2012-05-08 8:03 ` Pekka Enberg
2012-05-08 9:15 ` leonid.moiseichuk
2012-05-08 9:15 ` leonid.moiseichuk
2012-05-08 9:19 ` Pekka Enberg
2012-05-08 9:19 ` Pekka Enberg
2012-05-08 10:38 ` leonid.moiseichuk
2012-05-08 10:38 ` leonid.moiseichuk
2012-06-01 12:21 ` [PATCH 0/5] Some vmevent fixes Anton Vorontsov
2012-06-01 12:21 ` Anton Vorontsov
2012-06-01 12:24 ` [PATCH 1/5] vmstat: Implement refresh_vm_stats() Anton Vorontsov
2012-06-01 12:24 ` Anton Vorontsov
2012-06-05 14:30 ` Christoph Lameter
2012-06-05 14:30 ` Christoph Lameter
2012-06-08 3:17 ` KOSAKI Motohiro
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
2012-06-01 12:24 ` Anton Vorontsov
2012-06-08 3:25 ` KOSAKI Motohiro
2012-06-08 3:25 ` KOSAKI Motohiro
2012-06-08 6:58 ` Anton Vorontsov
2012-06-08 6:58 ` Anton Vorontsov
2012-06-08 7:03 ` Pekka Enberg
2012-06-08 7:03 ` Pekka Enberg
2012-06-08 8:07 ` Anton Vorontsov
2012-06-08 8:07 ` Anton Vorontsov
2012-06-08 7:05 ` leonid.moiseichuk
2012-06-08 7:05 ` leonid.moiseichuk
2012-06-08 7:10 ` KOSAKI Motohiro
2012-06-08 7:10 ` KOSAKI Motohiro
2012-06-08 7:18 ` leonid.moiseichuk
2012-06-08 7:18 ` leonid.moiseichuk
2012-06-08 7:23 ` KOSAKI Motohiro
2012-06-08 7:23 ` KOSAKI Motohiro
2012-06-08 7:28 ` leonid.moiseichuk
2012-06-08 7:28 ` leonid.moiseichuk
2012-06-08 7:33 ` KOSAKI Motohiro
2012-06-08 7:33 ` KOSAKI Motohiro
2012-06-08 7:49 ` leonid.moiseichuk
2012-06-08 7:49 ` leonid.moiseichuk
2012-06-08 7:58 ` Anton Vorontsov
2012-06-08 7:58 ` Anton Vorontsov
2012-06-08 8:16 ` leonid.moiseichuk
2012-06-08 8:16 ` leonid.moiseichuk
2012-06-08 8:41 ` Anton Vorontsov
2012-06-08 8:41 ` Anton Vorontsov
2012-06-08 8:57 ` leonid.moiseichuk
2012-06-08 8:57 ` leonid.moiseichuk
2012-06-08 10:35 ` Anton Vorontsov
2012-06-08 10:35 ` Anton Vorontsov
2012-06-08 11:03 ` leonid.moiseichuk
2012-06-08 11:03 ` leonid.moiseichuk
2012-06-08 12:13 ` Anton Vorontsov
2012-06-08 12:13 ` Anton Vorontsov
2012-06-08 12:25 ` leonid.moiseichuk
2012-06-08 12:25 ` leonid.moiseichuk
2012-06-01 12:24 ` [PATCH 3/5] vmevent: Refresh vmstats before sampling Anton Vorontsov
2012-06-01 12:24 ` Anton Vorontsov
2012-06-05 14:36 ` Christoph Lameter
2012-06-05 14:36 ` Christoph Lameter
2012-06-01 12:24 ` [PATCH 4/5] vmevent: Hide meaningful names from the user-visible header Anton Vorontsov
2012-06-01 12:24 ` Anton Vorontsov
2012-06-01 12:24 ` [PATCH 5/5] vmevent: Rename one-shot mode to edge trigger mode Anton Vorontsov
2012-06-01 12:24 ` Anton Vorontsov
2012-06-03 18:26 ` [PATCH 0/5] Some vmevent fixes Pekka Enberg
2012-06-03 18:26 ` Pekka Enberg
2012-06-04 8:45 ` Minchan Kim
2012-06-04 8:45 ` Minchan Kim
2012-06-04 9:20 ` Pekka Enberg
2012-06-04 9:20 ` Pekka Enberg
2012-06-04 12:23 ` Minchan Kim
2012-06-04 12:23 ` Minchan Kim
2012-06-04 11:38 ` Anton Vorontsov
2012-06-04 11:38 ` Anton Vorontsov
2012-06-04 12:17 ` Minchan Kim
2012-06-04 12:17 ` Minchan Kim
2012-06-04 13:35 ` Anton Vorontsov
2012-06-04 13:35 ` Anton Vorontsov
2012-06-05 7:53 ` Pekka Enberg
2012-06-05 7:53 ` Pekka Enberg
2012-06-05 8:00 ` Minchan Kim
2012-06-05 8:00 ` Minchan Kim
2012-06-05 8:01 ` Pekka Enberg
2012-06-05 8:01 ` Pekka Enberg
2012-06-05 8:16 ` leonid.moiseichuk
2012-06-05 8:16 ` leonid.moiseichuk
2012-06-05 8:27 ` Minchan Kim
2012-06-05 8:27 ` Minchan Kim
2012-06-08 3:35 ` KOSAKI Motohiro
2012-06-08 3:35 ` KOSAKI Motohiro
2012-06-04 20:05 ` KOSAKI Motohiro
2012-06-04 20:05 ` KOSAKI Motohiro
2012-06-04 22:39 ` Anton Vorontsov
2012-06-04 22:39 ` Anton Vorontsov
2012-06-08 3:45 ` KOSAKI Motohiro
2012-06-08 3:45 ` KOSAKI Motohiro
2012-06-08 6:57 ` Pekka Enberg
2012-06-08 6:57 ` Pekka Enberg
2012-06-05 7:47 ` Pekka Enberg
2012-06-05 7:47 ` Pekka Enberg
2012-06-05 8:39 ` Anton Vorontsov
2012-06-05 8:39 ` Anton Vorontsov
2012-06-07 2:41 ` Minchan Kim
2012-06-07 2:41 ` Minchan Kim
2012-06-08 7:49 ` Anton Vorontsov
2012-06-08 7:49 ` Anton Vorontsov
2012-06-08 8:43 ` Minchan Kim
2012-06-08 8:43 ` Minchan Kim
2012-06-08 8:48 ` Pekka Enberg
2012-06-08 8:48 ` Pekka Enberg
2012-06-08 9:12 ` leonid.moiseichuk
2012-06-08 9:12 ` leonid.moiseichuk
2012-06-08 9:45 ` Anton Vorontsov
2012-06-08 9:45 ` Anton Vorontsov
2012-06-08 10:42 ` Minchan Kim
2012-06-08 10:42 ` Minchan Kim
2012-06-08 11:14 ` Anton Vorontsov
2012-06-08 11:14 ` Anton Vorontsov
2012-06-11 4:50 ` Minchan Kim
2012-06-11 4:50 ` Minchan Kim
2012-06-05 7:52 ` Pekka Enberg
2012-06-05 7:52 ` Pekka Enberg
2012-06-08 3:55 ` KOSAKI Motohiro
2012-06-08 3:55 ` KOSAKI Motohiro
2012-06-08 6:54 ` Pekka Enberg
2012-06-08 6:54 ` Pekka Enberg
2012-06-08 6:57 ` KOSAKI Motohiro
2012-06-08 6:57 ` KOSAKI Motohiro
2012-06-08 6:59 ` Pekka Enberg
2012-06-08 6:59 ` Pekka Enberg
2012-06-04 19:50 ` KOSAKI Motohiro
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 8:32 ` Minchan Kim
2012-05-08 9:27 ` Pekka Enberg
2012-05-08 9:27 ` Pekka Enberg
2012-06-05 14:40 ` Christoph Lameter
2012-06-05 14:40 ` Christoph Lameter
2012-05-08 6:58 ` Anton Vorontsov
2012-05-08 6:58 ` Anton Vorontsov
2012-05-08 7:16 ` KOSAKI Motohiro
2012-05-08 7:16 ` KOSAKI Motohiro
2012-05-08 8:13 ` Anton Vorontsov
2012-05-08 8:13 ` Anton Vorontsov
2012-05-08 8:21 ` Anton Vorontsov [this message]
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 8:10 ` Pekka Enberg
2012-05-03 9:44 ` Anton Vorontsov
2012-05-03 9:44 ` Anton Vorontsov
2012-05-03 10:54 ` Pekka Enberg
2012-05-03 10:54 ` Pekka Enberg
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