From: Rik van Riel <riel@redhat.com>
To: David Rientjes <rientjes@google.com>
Cc: Satoru Moriya <satoru.moriya@hds.com>,
Randy Dunlap <rdunlap@xenotime.net>,
Satoru Moriya <smoriya@redhat.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
"lwoodman@redhat.com" <lwoodman@redhat.com>,
Seiji Aguchi <saguchi@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
Hugh Dickins <hughd@google.com>,
"hannes@cmpxchg.org" <hannes@cmpxchg.org>
Subject: Re: [PATCH -v2 -mm] add extra free kbytes tunable
Date: Thu, 13 Oct 2011 00:13:24 -0400 [thread overview]
Message-ID: <4E966564.5030902@redhat.com> (raw)
In-Reply-To: <alpine.DEB.2.00.1110121316590.7646@chino.kir.corp.google.com>
On 10/12/2011 04:21 PM, David Rientjes wrote:
> On Wed, 12 Oct 2011, Rik van Riel wrote:
>
>> How would this scheme work?
>>
>
> I suggested a patch from BFS that would raise kswapd to the same priority
> of the task that triggered it (not completely up to rt, but the highest
> possible in that case) and I'm waiting to hear if that helps for Satoru's
> test case before looking at alternatives. We could also extend the patch
> to raise the priority of an already running kswapd if a higher priority
> task calls into the page allocator's slowpath.
This has the distinct benefit of making kswapd most active right
at the same time the application is most active, which returns
us to your first objection to the extra free kbytes patch (apps
will suffer from kswapd cpu use).
Furthermore, I am not sure that giving kswapd more CPU time is
going to help, because kswapd could be stuck on some lock, held
by a lower priority (or sleeping) context.
I agree that the BFS patch would be worth a try, and would be
very pleasantly surprised if it worked, but I am not very
optimistic about it...
--
All rights reversed
WARNING: multiple messages have this Message-ID (diff)
From: Rik van Riel <riel@redhat.com>
To: David Rientjes <rientjes@google.com>
Cc: Satoru Moriya <satoru.moriya@hds.com>,
Randy Dunlap <rdunlap@xenotime.net>,
Satoru Moriya <smoriya@redhat.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
"lwoodman@redhat.com" <lwoodman@redhat.com>,
Seiji Aguchi <saguchi@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
Hugh Dickins <hughd@google.com>,
"hannes@cmpxchg.org" <hannes@cmpxchg.org>
Subject: Re: [PATCH -v2 -mm] add extra free kbytes tunable
Date: Thu, 13 Oct 2011 00:13:24 -0400 [thread overview]
Message-ID: <4E966564.5030902@redhat.com> (raw)
In-Reply-To: <alpine.DEB.2.00.1110121316590.7646@chino.kir.corp.google.com>
On 10/12/2011 04:21 PM, David Rientjes wrote:
> On Wed, 12 Oct 2011, Rik van Riel wrote:
>
>> How would this scheme work?
>>
>
> I suggested a patch from BFS that would raise kswapd to the same priority
> of the task that triggered it (not completely up to rt, but the highest
> possible in that case) and I'm waiting to hear if that helps for Satoru's
> test case before looking at alternatives. We could also extend the patch
> to raise the priority of an already running kswapd if a higher priority
> task calls into the page allocator's slowpath.
This has the distinct benefit of making kswapd most active right
at the same time the application is most active, which returns
us to your first objection to the extra free kbytes patch (apps
will suffer from kswapd cpu use).
Furthermore, I am not sure that giving kswapd more CPU time is
going to help, because kswapd could be stuck on some lock, held
by a lower priority (or sleeping) context.
I agree that the BFS patch would be worth a try, and would be
very pleasantly surprised if it worked, but I am not very
optimistic about it...
--
All rights reversed
--
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next prev parent reply other threads:[~2011-10-13 4:35 UTC|newest]
Thread overview: 102+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-09-01 14:52 [PATCH -mm] add extra free kbytes tunable Rik van Riel
2011-09-01 14:52 ` Rik van Riel
2011-09-01 17:06 ` Randy Dunlap
2011-09-01 17:06 ` Randy Dunlap
2011-09-01 19:26 ` [PATCH -v2 " Rik van Riel
2011-09-01 19:26 ` Rik van Riel
2011-09-01 21:58 ` Andrew Morton
2011-09-01 21:58 ` Andrew Morton
2011-09-01 22:08 ` David Rientjes
2011-09-01 22:08 ` David Rientjes
2011-09-01 22:16 ` Andrew Morton
2011-09-01 22:16 ` Andrew Morton
2011-09-02 16:31 ` Satoru Moriya
2011-09-02 16:31 ` Satoru Moriya
2011-10-13 7:33 ` Minchan Kim
2011-10-13 7:33 ` Minchan Kim
2011-10-13 8:09 ` KAMEZAWA Hiroyuki
2011-10-13 8:09 ` KAMEZAWA Hiroyuki
[not found] ` <E1FA588BC672D846BDBB452FCA1E308C2389B4@USINDEVS02.corp.hds.com>
2011-09-15 3:33 ` Satoru Moriya
2011-09-15 3:33 ` Satoru Moriya
2011-09-01 22:09 ` Andrew Morton
2011-09-01 22:09 ` Andrew Morton
2011-09-02 16:26 ` [PATCH -mm] fixes & cleanups for "add extra free kbytes tunable" Rik van Riel
2011-09-02 16:26 ` Rik van Riel
2011-09-30 21:43 ` [PATCH -v2 -mm] add extra free kbytes tunable Johannes Weiner
2011-09-30 21:43 ` Johannes Weiner
2011-10-08 3:08 ` David Rientjes
2011-10-08 3:08 ` David Rientjes
2011-10-10 22:37 ` Andrew Morton
2011-10-10 22:37 ` Andrew Morton
2011-10-11 19:32 ` Satoru Moriya
2011-10-11 19:32 ` Satoru Moriya
2011-10-11 19:54 ` Andrew Morton
2011-10-11 19:54 ` Andrew Morton
2011-10-11 20:23 ` Satoru Moriya
2011-10-11 20:23 ` Satoru Moriya
2011-10-11 20:54 ` Andrew Morton
2011-10-11 20:54 ` Andrew Morton
2011-10-12 13:09 ` Rik van Riel
2011-10-12 13:09 ` Rik van Riel
2011-10-12 19:20 ` Andrew Morton
2011-10-12 19:20 ` Andrew Morton
2011-10-12 19:58 ` Rik van Riel
2011-10-12 19:58 ` Rik van Riel
2011-10-12 20:26 ` David Rientjes
2011-10-12 20:26 ` David Rientjes
2011-10-21 23:48 ` Satoru Moriya
2011-10-21 23:48 ` Satoru Moriya
2011-10-23 21:22 ` David Rientjes
2011-10-23 21:22 ` David Rientjes
2011-10-25 2:04 ` Satoru Moriya
2011-10-25 2:04 ` Satoru Moriya
2011-10-25 21:50 ` David Rientjes
2011-10-25 21:50 ` David Rientjes
2011-10-26 18:59 ` Satoru Moriya
2011-10-26 18:59 ` Satoru Moriya
2011-10-12 21:08 ` Satoru Moriya
2011-10-12 21:08 ` Satoru Moriya
2011-10-12 22:41 ` David Rientjes
2011-10-12 22:41 ` David Rientjes
2011-10-12 23:52 ` Satoru Moriya
2011-10-12 23:52 ` Satoru Moriya
2011-10-13 0:01 ` David Rientjes
2011-10-13 0:01 ` David Rientjes
2011-10-13 5:35 ` KAMEZAWA Hiroyuki
2011-10-13 5:35 ` KAMEZAWA Hiroyuki
2011-10-13 20:55 ` David Rientjes
2011-10-13 20:55 ` David Rientjes
2011-10-14 22:16 ` Satoru Moriya
2011-10-14 22:16 ` Satoru Moriya
2011-10-14 22:46 ` David Rientjes
2011-10-14 22:46 ` David Rientjes
2011-10-14 5:32 ` Satoru Moriya
2011-10-14 5:32 ` Satoru Moriya
2011-10-14 5:06 ` Satoru Moriya
2011-10-14 5:06 ` Satoru Moriya
2011-10-11 23:22 ` David Rientjes
2011-10-11 23:22 ` David Rientjes
2011-10-13 16:54 ` Satoru Moriya
2011-10-13 16:54 ` Satoru Moriya
2011-10-13 20:48 ` David Rientjes
2011-10-13 20:48 ` David Rientjes
2011-10-13 21:11 ` Rik van Riel
2011-10-13 21:11 ` Rik van Riel
2011-10-13 22:02 ` David Rientjes
2011-10-13 22:02 ` David Rientjes
2011-10-11 19:20 ` Satoru Moriya
2011-10-11 19:20 ` Satoru Moriya
2011-10-11 21:04 ` David Rientjes
2011-10-11 21:04 ` David Rientjes
2011-10-12 13:13 ` Rik van Riel
2011-10-12 13:13 ` Rik van Riel
2011-10-12 20:21 ` David Rientjes
2011-10-12 20:21 ` David Rientjes
2011-10-13 4:13 ` Rik van Riel [this message]
2011-10-13 4:13 ` Rik van Riel
2011-10-13 5:22 ` David Rientjes
2011-10-13 5:22 ` David Rientjes
2011-10-22 0:11 ` Satoru Moriya
2011-10-22 0:11 ` Satoru Moriya
2011-09-09 23:01 Satoru Moriya
2011-09-09 23:01 ` Satoru Moriya
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