From: Balbir Singh <bsingharora@gmail.com>
To: Michel Lespinasse <walken@google.com>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Andrew Morton <akpm@linux-foundation.org>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
Dave Hansen <dave@linux.vnet.ibm.com>,
Andrea Arcangeli <aarcange@redhat.com>,
Rik van Riel <riel@redhat.com>,
Johannes Weiner <jweiner@redhat.com>,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
Hugh Dickins <hughd@google.com>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Michael Wolf <mjwolf@us.ibm.com>
Subject: Re: [PATCH 0/8] idle page tracking / working set estimation
Date: Tue, 27 Sep 2011 15:33:10 +0530 [thread overview]
Message-ID: <CAKTCnzkzdQgut96NZf3Mi2kpOWW7N3qeybets5AHy7Gp8Wj_HQ@mail.gmail.com> (raw)
In-Reply-To: <1316230753-8693-1-git-send-email-walken@google.com>
On Sat, Sep 17, 2011 at 9:09 AM, Michel Lespinasse <walken@google.com> wrote:
> Please comment on the following patches (which are against the v3.0 kernel).
> We are using these to collect memory utilization statistics for each cgroup
> accross many machines, and optimize job placement accordingly.
>
> The statistics are intended to be compared accross many machines - we
> don't just want to know which cgroup to reclaim from on an individual
> machine, we also need to know which machine is best to target a job onto
> within a large cluster. Also, we try to have a low impact on the normal
> MM algorithms - we think they already do a fine job balancing resources
> on individual machines, so we are not trying to mess up with that here.
>
> Patch 1 introduces no functionality; it modifies the page_referenced API
> so that it can be more easily extended in patch 3.
>
> Patch 2 documents the proposed features, and adds a configuration option
> for these. When the features are compiled in, they are still disabled
> until the administrator sets up the desired scanning interval; however
> the configuration option seems necessary as the features make use of
> 3 extra page flags - there is plenty of space for these in 64-bit builds,
> but less so in 32-bit builds...
>
> Patch 3 introduces page_referenced_kstaled(), which is similar to
> page_referenced() but is used for idle page tracking rather than
> for memory reclaimation. Since both functions clear the pte_young bits
> and we don't want them to interfere with each other, two new page flags
> are introduced that track when young pte references have been cleared by
> each of the page_referenced variants.
Sorry, I have trouble parsing this sentence, could you elaborate on "when"?
Balbir Singh
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next prev parent reply other threads:[~2011-09-27 10:03 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-09-17 3:39 Michel Lespinasse
2011-09-17 3:39 ` [PATCH 1/8] page_referenced: replace vm_flags parameter with struct pr_info Michel Lespinasse
2011-09-17 3:44 ` Joe Perches
2011-09-17 4:51 ` Michel Lespinasse
2011-09-20 19:05 ` Rik van Riel
2011-09-21 2:51 ` Michel Lespinasse
2011-09-17 3:39 ` [PATCH 2/8] kstaled: documentation and config option Michel Lespinasse
2011-09-20 21:23 ` Rik van Riel
2011-09-23 19:27 ` Rik van Riel
2011-09-17 3:39 ` [PATCH 3/8] kstaled: page_referenced_kstaled() and supporting infrastructure Michel Lespinasse
2011-09-20 19:36 ` Peter Zijlstra
2011-09-17 3:39 ` [PATCH 4/8] kstaled: minimalistic implementation Michel Lespinasse
2011-09-22 23:14 ` Andrew Morton
2011-09-23 8:37 ` Michel Lespinasse
2011-09-17 3:39 ` [PATCH 5/8] kstaled: skip non-RAM regions Michel Lespinasse
2011-09-17 3:39 ` [PATCH 6/8] kstaled: rate limit pages scanned per second Michel Lespinasse
2011-09-22 23:15 ` Andrew Morton
2011-09-23 10:18 ` Michel Lespinasse
2011-09-17 3:39 ` [PATCH 7/8] kstaled: add histogram sampling functionality Michel Lespinasse
2011-09-22 23:15 ` Andrew Morton
2011-09-23 10:26 ` Michel Lespinasse
2011-09-17 3:39 ` [PATCH 8/8] kstaled: add incrementally updating stale page count Michel Lespinasse
2011-09-22 23:13 ` [PATCH 0/8] idle page tracking / working set estimation Andrew Morton
2011-09-23 1:23 ` Michel Lespinasse
2011-09-27 10:03 ` Balbir Singh [this message]
2011-09-27 10:14 ` Michel Lespinasse
2011-09-27 16:50 ` Balbir Singh
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