From: Gleb Natapov <gleb@redhat.com>
To: Hugh Dickins <hughd@google.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Marcelo Tosatti <mtosatti@redhat.com>,
Petr Holasek <pholasek@redhat.com>,
Andrea Arcangeli <aarcange@redhat.com>,
Izik Eidus <izik.eidus@ravellosystems.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,
kvm@vger.kernel.org
Subject: Re: [PATCH 0/11] ksm: NUMA trees and page migration
Date: Tue, 29 Jan 2013 12:45:14 +0200 [thread overview]
Message-ID: <20130129104513.GA15004@redhat.com> (raw)
In-Reply-To: <alpine.LNX.2.00.1301281701010.4947@eggly.anvils>
On Mon, Jan 28, 2013 at 05:07:15PM -0800, Hugh Dickins wrote:
> On Mon, 28 Jan 2013, 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?
> >
> > IOW, is it justifying itself?
>
> I have no idea! To me it's simply a technical challenge - and I agree
> with your implication that that's not a good enough justification.
>
> I've added Marcelo and Gleb and the KVM list to the Cc:
> my understanding is that it's the KVM guys who really appreciate KSM.
>
KSM is used on all RH kvm deployments for memory overcommit. I asked
around for numbers and got the answer that it allows to squeeze anywhere
between 10% and 100% more VMs on the same machine depends on a type of
a guest OS and how similar workloads of VMs are. And management tries
to keep VMs with similar OSes/workloads on the same host to gain more
from KSM.
--
Gleb.
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
WARNING: multiple messages have this Message-ID (diff)
From: Gleb Natapov <gleb@redhat.com>
To: Hugh Dickins <hughd@google.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Marcelo Tosatti <mtosatti@redhat.com>,
Petr Holasek <pholasek@redhat.com>,
Andrea Arcangeli <aarcange@redhat.com>,
Izik Eidus <izik.eidus@ravellosystems.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,
kvm@vger.kernel.org
Subject: Re: [PATCH 0/11] ksm: NUMA trees and page migration
Date: Tue, 29 Jan 2013 12:45:14 +0200 [thread overview]
Message-ID: <20130129104513.GA15004@redhat.com> (raw)
In-Reply-To: <alpine.LNX.2.00.1301281701010.4947@eggly.anvils>
On Mon, Jan 28, 2013 at 05:07:15PM -0800, Hugh Dickins wrote:
> On Mon, 28 Jan 2013, 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?
> >
> > IOW, is it justifying itself?
>
> I have no idea! To me it's simply a technical challenge - and I agree
> with your implication that that's not a good enough justification.
>
> I've added Marcelo and Gleb and the KVM list to the Cc:
> my understanding is that it's the KVM guys who really appreciate KSM.
>
KSM is used on all RH kvm deployments for memory overcommit. I asked
around for numbers and got the answer that it allows to squeeze anywhere
between 10% and 100% more VMs on the same machine depends on a type of
a guest OS and how similar workloads of VMs are. And management tries
to keep VMs with similar OSes/workloads on the same host to gain more
from KSM.
--
Gleb.
next prev parent reply other threads:[~2013-01-29 10:45 UTC|newest]
Thread overview: 138+ 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 1:53 ` Hugh Dickins
2013-01-26 1:54 ` [PATCH 1/11] ksm: allow trees per NUMA node Hugh Dickins
2013-01-26 1:54 ` Hugh Dickins
2013-01-27 1:14 ` Simon Jeons
2013-01-27 1:14 ` Simon Jeons
2013-01-27 2:54 ` Hugh Dickins
2013-01-27 2:54 ` Hugh Dickins
2013-01-27 3:16 ` Simon Jeons
2013-01-27 3:16 ` Simon Jeons
2013-01-27 21:55 ` Hugh Dickins
2013-01-27 21:55 ` Hugh Dickins
2013-01-28 23:03 ` Andrew Morton
2013-01-28 23:03 ` Andrew Morton
2013-01-29 1:17 ` Hugh Dickins
2013-01-29 1:17 ` Hugh Dickins
2013-01-28 23:08 ` Andrew Morton
2013-01-28 23:08 ` Andrew Morton
2013-01-29 1:38 ` Hugh Dickins
2013-01-29 1:38 ` Hugh Dickins
2013-02-05 16:41 ` Mel Gorman
2013-02-05 16:41 ` Mel Gorman
2013-02-07 23:57 ` Hugh Dickins
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 1:56 ` Hugh Dickins
2013-01-26 1:58 ` [PATCH 3/11] ksm: trivial tidyups Hugh Dickins
2013-01-26 1:58 ` Hugh Dickins
2013-01-28 23:11 ` Andrew Morton
2013-01-28 23:11 ` Andrew Morton
2013-01-29 1:44 ` Hugh Dickins
2013-01-29 1:44 ` Hugh Dickins
2013-01-26 1:59 ` [PATCH 4/11] ksm: reorganize ksm_check_stable_tree Hugh Dickins
2013-01-26 1:59 ` Hugh Dickins
2013-02-05 16:48 ` Mel Gorman
2013-02-05 16:48 ` Mel Gorman
2013-02-08 0:07 ` Hugh Dickins
2013-02-08 0:07 ` Hugh Dickins
2013-02-14 11:30 ` Mel Gorman
2013-02-14 11:30 ` Mel Gorman
2013-01-26 2:00 ` [PATCH 5/11] ksm: get_ksm_page locked Hugh Dickins
2013-01-26 2:00 ` Hugh Dickins
2013-01-27 2:36 ` Simon Jeons
2013-01-27 2:36 ` Simon Jeons
2013-01-27 22:08 ` Hugh Dickins
2013-01-27 22:08 ` Hugh Dickins
2013-01-28 0:36 ` Simon Jeons
2013-01-28 0:36 ` Simon Jeons
2013-01-28 3:35 ` Hugh Dickins
2013-01-28 3:35 ` Hugh Dickins
2013-01-27 2:48 ` Simon Jeons
2013-01-27 2:48 ` Simon Jeons
2013-01-27 22:10 ` Hugh Dickins
2013-01-27 22:10 ` Hugh Dickins
2013-02-05 17:18 ` Mel Gorman
2013-02-05 17:18 ` Mel Gorman
2013-02-08 0:33 ` Hugh Dickins
2013-02-08 0:33 ` Hugh Dickins
2013-02-14 11:34 ` Mel Gorman
2013-02-14 11:34 ` Mel Gorman
2013-01-26 2:01 ` [PATCH 6/11] ksm: remove old stable nodes more thoroughly Hugh Dickins
2013-01-26 2:01 ` Hugh Dickins
2013-01-27 4:55 ` Simon Jeons
2013-01-27 4:55 ` Simon Jeons
2013-01-27 23:05 ` Hugh Dickins
2013-01-27 23:05 ` Hugh Dickins
2013-01-28 1:42 ` Simon Jeons
2013-01-28 1:42 ` Simon Jeons
2013-01-28 4:14 ` Hugh Dickins
2013-01-28 4:14 ` Hugh Dickins
2013-01-28 2:12 ` Simon Jeons
2013-01-28 2:12 ` Simon Jeons
2013-01-28 4:19 ` Hugh Dickins
2013-01-28 4:19 ` Hugh Dickins
2013-01-28 6:36 ` Simon Jeons
2013-01-28 6:36 ` Simon Jeons
2013-01-28 23:44 ` Andrew Morton
2013-01-28 23:44 ` Andrew Morton
2013-01-29 2:03 ` Hugh Dickins
2013-01-29 2:03 ` Hugh Dickins
2013-02-05 17:55 ` Mel Gorman
2013-02-05 17:55 ` Mel Gorman
2013-02-08 19:33 ` Hugh Dickins
2013-02-08 19:33 ` Hugh Dickins
2013-02-14 11:58 ` Mel Gorman
2013-02-14 11:58 ` Mel Gorman
2013-02-14 22:19 ` Hugh Dickins
2013-02-14 22:19 ` Hugh Dickins
2013-01-26 2:03 ` [PATCH 7/11] ksm: make KSM page migration possible Hugh Dickins
2013-01-26 2:03 ` Hugh Dickins
2013-01-27 5:47 ` Simon Jeons
2013-01-27 5:47 ` Simon Jeons
2013-01-27 23:12 ` Hugh Dickins
2013-01-27 23:12 ` Hugh Dickins
2013-01-28 0:41 ` Simon Jeons
2013-01-28 0:41 ` Simon Jeons
2013-01-28 3:44 ` Hugh Dickins
2013-01-28 3:44 ` Hugh Dickins
2013-02-05 19:11 ` Mel Gorman
2013-02-05 19:11 ` Mel Gorman
2013-02-08 20:52 ` Hugh Dickins
2013-02-08 20:52 ` Hugh Dickins
2013-01-26 2:05 ` [PATCH 8/11] ksm: make !merge_across_nodes migration safe Hugh Dickins
2013-01-26 2:05 ` Hugh Dickins
2013-01-27 8:49 ` Simon Jeons
2013-01-27 8:49 ` Simon Jeons
2013-01-27 23:25 ` Hugh Dickins
2013-01-27 23:25 ` Hugh Dickins
2013-01-28 3:44 ` Simon Jeons
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 2:06 ` Hugh Dickins
2013-01-26 2:07 ` [PATCH 10/11] mm: remove offlining arg to migrate_pages Hugh Dickins
2013-01-26 2:07 ` Hugh Dickins
2013-01-26 2:10 ` [PATCH 11/11] ksm: stop hotremove lockdep warning Hugh Dickins
2013-01-26 2:10 ` Hugh Dickins
2013-01-27 6:23 ` Simon Jeons
2013-01-27 6:23 ` Simon Jeons
2013-01-27 23:35 ` Hugh Dickins
2013-01-27 23:35 ` Hugh Dickins
2013-02-08 18:45 ` Gerald Schaefer
2013-02-08 18:45 ` Gerald Schaefer
2013-02-11 22:13 ` Hugh Dickins
2013-02-11 22:13 ` Hugh Dickins
2013-01-28 23:54 ` [PATCH 0/11] ksm: NUMA trees and page migration Andrew Morton
2013-01-28 23:54 ` Andrew Morton
2013-01-29 0:49 ` Izik Eidus
2013-01-29 0:49 ` Izik Eidus
2013-01-29 2:26 ` Izik Eidus
2013-01-29 2:26 ` Izik Eidus
2013-01-29 16:51 ` Andrea Arcangeli
2013-01-29 16:51 ` Andrea Arcangeli
2013-01-31 0:05 ` Ric Mason
2013-01-31 0:05 ` Ric Mason
2013-01-29 1:07 ` Hugh Dickins
2013-01-29 1:07 ` Hugh Dickins
2013-01-29 10:45 ` Gleb Natapov [this message]
2013-01-29 10:45 ` Gleb Natapov
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20130129104513.GA15004@redhat.com \
--to=gleb@redhat.com \
--cc=aarcange@redhat.com \
--cc=akpm@linux-foundation.org \
--cc=anton@redhat.com \
--cc=hughd@google.com \
--cc=izik.eidus@ravellosystems.com \
--cc=kvm@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=mgorman@suse.de \
--cc=mtosatti@redhat.com \
--cc=pholasek@redhat.com \
--cc=riel@redhat.com \
--cc=rientjes@google.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.