From: Satoru Moriya <satoru.moriya@hds.com>
To: Andrew Morton <akpm@linux-foundation.org>,
David Rientjes <rientjes@google.com>
Cc: Rik van Riel <riel@redhat.com>,
Randy Dunlap <rdunlap@xenotime.net>,
Satoru Moriya <smoriya@redhat.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"lwoodman@redhat.com" <lwoodman@redhat.com>,
Seiji Aguchi <saguchi@redhat.com>,
"hughd@google.com" <hughd@google.com>,
"hannes@cmpxchg.org" <hannes@cmpxchg.org>
Subject: RE: [PATCH -v2 -mm] add extra free kbytes tunable
Date: Tue, 11 Oct 2011 15:32:11 -0400 [thread overview]
Message-ID: <65795E11DBF1E645A09CEC7EAEE94B9CB516CBC4@USINDEVS02.corp.hds.com> (raw)
In-Reply-To: <20111010153723.6397924f.akpm@linux-foundation.org>
On 10/10/2011 06:37 PM, Andrew Morton wrote:
> On Fri, 7 Oct 2011 20:08:19 -0700 (PDT) David Rientjes
> <rientjes@google.com> wrote:
>
>> On Thu, 1 Sep 2011, Rik van Riel wrote:
>
> The page allocator already tries harder if the caller has
> rt_task(current). Why is this inadequate? Can we extend this idea
> further to fix whatever-the-problem-is?
Actually page allocator decreases min watermark to 3/4 * min watermark
for rt-task. But in our case some applications create a lot of
processes and if all of them are rt-task, the amount of watermark
bonus(1/4 * min watermark) is not enough.
If we can tune the amount of bonus, it may be fine. But that is
almost all same as extra free kbytes.
> Does there exist anything like a test case which demonstrates the need
> for this feature?
Unfortunately I don't have a real test case but just simple one.
And in my simple test case, I can avoid direct reclaim if we set
workload as rt-task.
The simple test case I used is following:
http://marc.info/?l=linux-mm&m=131605773321672&w=2
Regards,
Satoru
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next prev parent reply other threads:[~2011-10-11 19:35 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-09-01 14:52 [PATCH " Rik van Riel
2011-09-01 17:06 ` Randy Dunlap
2011-09-01 19:26 ` [PATCH -v2 " Rik van Riel
2011-09-01 21:58 ` Andrew Morton
2011-09-01 22:08 ` David Rientjes
2011-09-01 22:16 ` Andrew Morton
2011-09-02 16:31 ` Satoru Moriya
2011-10-13 7:33 ` Minchan Kim
2011-10-13 8:09 ` KAMEZAWA Hiroyuki
[not found] ` <E1FA588BC672D846BDBB452FCA1E308C2389B4@USINDEVS02.corp.hds.com>
2011-09-15 3:33 ` Satoru Moriya
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
2011-09-30 21:43 ` [PATCH -v2 -mm] add extra free kbytes tunable Johannes Weiner
2011-10-08 3:08 ` David Rientjes
2011-10-10 22:37 ` Andrew Morton
2011-10-11 19:32 ` Satoru Moriya [this message]
2011-10-11 19:54 ` Andrew Morton
2011-10-11 20:23 ` Satoru Moriya
2011-10-11 20:54 ` Andrew Morton
2011-10-12 13:09 ` Rik van Riel
2011-10-12 19:20 ` Andrew Morton
2011-10-12 19:58 ` Rik van Riel
2011-10-12 20:26 ` David Rientjes
2011-10-21 23:48 ` Satoru Moriya
2011-10-23 21:22 ` David Rientjes
2011-10-25 2:04 ` Satoru Moriya
2011-10-25 21:50 ` David Rientjes
2011-10-26 18:59 ` Satoru Moriya
2011-10-12 21:08 ` Satoru Moriya
2011-10-12 22:41 ` David Rientjes
2011-10-12 23:52 ` Satoru Moriya
2011-10-13 0:01 ` David Rientjes
2011-10-13 5:35 ` KAMEZAWA Hiroyuki
2011-10-13 20:55 ` David Rientjes
2011-10-14 22:16 ` Satoru Moriya
2011-10-14 22:46 ` David Rientjes
2011-10-14 5:32 ` Satoru Moriya
2011-10-14 5:06 ` Satoru Moriya
2011-10-11 23:22 ` David Rientjes
2011-10-13 16:54 ` Satoru Moriya
2011-10-13 20:48 ` David Rientjes
2011-10-13 21:11 ` Rik van Riel
2011-10-13 22:02 ` David Rientjes
2011-10-11 19:20 ` Satoru Moriya
2011-10-11 21:04 ` David Rientjes
2011-10-12 13:13 ` Rik van Riel
2011-10-12 20:21 ` David Rientjes
2011-10-13 4:13 ` Rik van Riel
2011-10-13 5:22 ` David Rientjes
2011-10-22 0:11 ` Satoru Moriya
2011-09-09 23:01 Satoru Moriya
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