From: Andrea Arcangeli <aarcange@redhat.com>
To: Izik Eidus <izik.eidus@ravellosystems.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Hugh Dickins <hughd@google.com>,
Petr Holasek <pholasek@redhat.com>,
Rik van Riel <riel@redhat.com>,
David Rientjes <rientjes@google.com>,
Anton Arapov <anton@redhat.com>, Mel Gorman <mgorman@suse.de>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH 0/11] ksm: NUMA trees and page migration
Date: Tue, 29 Jan 2013 17:51:25 +0100 [thread overview]
Message-ID: <20130129165125.GA17671@redhat.com> (raw)
In-Reply-To: <51073345.4070605@ravellosystems.com>
Hi everyone,
On Tue, Jan 29, 2013 at 04:26:13AM +0200, Izik Eidus wrote:
> On 01/29/2013 02:49 AM, Izik Eidus wrote:
> > On 01/29/2013 01:54 AM, Andrew Morton wrote:
> >> On Fri, 25 Jan 2013 17:53:10 -0800 (PST)
> >> Hugh Dickins <hughd@google.com> wrote:
> >>
> >>> Here's a KSM series
> >> Sanity check: do you have a feeling for how useful KSM is?
> >> Performance/space improvements for typical (or atypical) workloads?
> >> Are people using it? Successfully?
>
>
> BTW, After thinking a bit about the word people, I wanted to see if
> normal users of linux
> that just download and install Linux (without using special
> virtualization product) are able to use it.
> So I google little bit for it, and found some nice results from users:
> http://serverascode.com/2012/11/11/ksm-kvm.html
>
> But I do agree that it provide justifying value only for virtualization
> users...
Mostly for virtualization users indeed, but I'm aware of a few non
virtualization users too:
1) CERN has been one of the early adopters of KSM and initially they
were using KSM standalone (probably because not all hypervisors they
had to deal with were KVM/linux based, while all guests were linux and
in turn KSM capable). More info in the KSM paper page 2:
http://www.kernel.org/doc/ols/2009/ols2009-pages-19-28.pdf
However lately they're running KSM in combination with KVM too, and I'm
not sure if they're still using it standalone. See the "KSM shared"
blue area in slide 12 and the comparison with KSM on and off in slide
14.
https://indico.fnal.gov/getFile.py/access?contribId=18&sessionId=4&resId=0&materialId=slides&confId=4986
2) all recent cyanogenmod in the performance menu in settings supports
KSM out of the box. You can run it for a while and then shut it
off.
Not sure how good idea it is to leave it always on, but the only
efficient cellphone/tablet powersaving design (i.e. the wakelocks +
suspend to ram) still won't waste energy while the screen is off and
the phone has suspended to ram, regardless of KSM on or off.
KSM NUMA awareness however is not needed on the cellphone :).
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next prev parent reply other threads:[~2013-01-29 16:51 UTC|newest]
Thread overview: 69+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-26 1:53 [PATCH 0/11] ksm: NUMA trees and page migration Hugh Dickins
2013-01-26 1:54 ` [PATCH 1/11] ksm: allow trees per NUMA node Hugh Dickins
2013-01-27 1:14 ` Simon Jeons
2013-01-27 2:54 ` Hugh Dickins
2013-01-27 3:16 ` Simon Jeons
2013-01-27 21:55 ` Hugh Dickins
2013-01-28 23:03 ` Andrew Morton
2013-01-29 1:17 ` Hugh Dickins
2013-01-28 23:08 ` Andrew Morton
2013-01-29 1:38 ` Hugh Dickins
2013-02-05 16:41 ` Mel Gorman
2013-02-07 23:57 ` Hugh Dickins
2013-01-26 1:56 ` [PATCH 2/11] ksm: add sysfs ABI Documentation Hugh Dickins
2013-01-26 1:58 ` [PATCH 3/11] ksm: trivial tidyups Hugh Dickins
2013-01-28 23:11 ` Andrew Morton
2013-01-29 1:44 ` Hugh Dickins
2013-01-26 1:59 ` [PATCH 4/11] ksm: reorganize ksm_check_stable_tree Hugh Dickins
2013-02-05 16:48 ` Mel Gorman
2013-02-08 0:07 ` Hugh Dickins
2013-02-14 11:30 ` Mel Gorman
2013-01-26 2:00 ` [PATCH 5/11] ksm: get_ksm_page locked Hugh Dickins
2013-01-27 2:36 ` Simon Jeons
2013-01-27 22:08 ` Hugh Dickins
2013-01-28 0:36 ` Simon Jeons
2013-01-28 3:35 ` Hugh Dickins
2013-01-27 2:48 ` Simon Jeons
2013-01-27 22:10 ` Hugh Dickins
2013-02-05 17:18 ` Mel Gorman
2013-02-08 0:33 ` Hugh Dickins
2013-02-14 11:34 ` Mel Gorman
2013-01-26 2:01 ` [PATCH 6/11] ksm: remove old stable nodes more thoroughly Hugh Dickins
2013-01-27 4:55 ` Simon Jeons
2013-01-27 23:05 ` Hugh Dickins
2013-01-28 1:42 ` Simon Jeons
2013-01-28 4:14 ` Hugh Dickins
2013-01-28 2:12 ` Simon Jeons
2013-01-28 4:19 ` Hugh Dickins
2013-01-28 6:36 ` Simon Jeons
2013-01-28 23:44 ` Andrew Morton
2013-01-29 2:03 ` Hugh Dickins
2013-02-05 17:55 ` Mel Gorman
2013-02-08 19:33 ` Hugh Dickins
2013-02-14 11:58 ` Mel Gorman
2013-02-14 22:19 ` Hugh Dickins
2013-01-26 2:03 ` [PATCH 7/11] ksm: make KSM page migration possible Hugh Dickins
2013-01-27 5:47 ` Simon Jeons
2013-01-27 23:12 ` Hugh Dickins
2013-01-28 0:41 ` Simon Jeons
2013-01-28 3:44 ` Hugh Dickins
2013-02-05 19:11 ` Mel Gorman
2013-02-08 20:52 ` Hugh Dickins
2013-01-26 2:05 ` [PATCH 8/11] ksm: make !merge_across_nodes migration safe Hugh Dickins
2013-01-27 8:49 ` Simon Jeons
2013-01-27 23:25 ` Hugh Dickins
2013-01-28 3:44 ` Simon Jeons
2013-01-26 2:06 ` [PATCH 9/11] ksm: enable KSM page migration Hugh Dickins
2013-01-26 2:07 ` [PATCH 10/11] mm: remove offlining arg to migrate_pages Hugh Dickins
2013-01-26 2:10 ` [PATCH 11/11] ksm: stop hotremove lockdep warning Hugh Dickins
2013-01-27 6:23 ` Simon Jeons
2013-01-27 23:35 ` Hugh Dickins
2013-02-08 18:45 ` Gerald Schaefer
2013-02-11 22:13 ` Hugh Dickins
2013-01-28 23:54 ` [PATCH 0/11] ksm: NUMA trees and page migration Andrew Morton
2013-01-29 0:49 ` Izik Eidus
2013-01-29 2:26 ` Izik Eidus
2013-01-29 16:51 ` Andrea Arcangeli [this message]
2013-01-31 0:05 ` Ric Mason
2013-01-29 1:07 ` Hugh Dickins
2013-01-29 10:45 ` Gleb Natapov
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