From: Andrew Morton <akpm@linux-foundation.org>
To: Zlatko Calusic <zlatko.calusic@iskon.hr>
Cc: Mel Gorman <mgorman@suse.de>, Hugh Dickins <hughd@google.com>,
Minchan Kim <minchan.kim@gmail.com>,
linux-mm <linux-mm@kvack.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] mm: wait for congestion to clear on all zones
Date: Wed, 9 Jan 2013 13:48:16 -0800 [thread overview]
Message-ID: <20130109134816.db51a820.akpm@linux-foundation.org> (raw)
In-Reply-To: <50EDE41C.7090107@iskon.hr>
On Wed, 09 Jan 2013 22:41:48 +0100
Zlatko Calusic <zlatko.calusic@iskon.hr> wrote:
> Currently we take a short nap (HZ/10) and wait for congestion to clear
> before taking another pass with lower priority in balance_pgdat(). But
> we do that only for the highest zone that we encounter is unbalanced
> and congested.
>
> This patch changes that to wait on all congested zones in a single
> pass in the hope that it will save us some scanning that way. Also we
> take a nap as soon as congested zone is encountered and sc.priority <
> DEF_PRIORITY - 2 (aka kswapd in trouble).
>
> ...
>
> The patch is against the mm tree. Make sure that
> mm-avoid-calling-pgdat_balanced-needlessly.patch is applied first (not
> yet in the mmotm tree). Tested on half a dozen systems with different
> workloads for the last few days, working really well!
But what are the user-observable effcets of this change? Less kernel
CPU consumption, presumably? Did you quantify it?
--
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: Andrew Morton <akpm@linux-foundation.org>
To: Zlatko Calusic <zlatko.calusic@iskon.hr>
Cc: Mel Gorman <mgorman@suse.de>, Hugh Dickins <hughd@google.com>,
Minchan Kim <minchan.kim@gmail.com>,
linux-mm <linux-mm@kvack.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] mm: wait for congestion to clear on all zones
Date: Wed, 9 Jan 2013 13:48:16 -0800 [thread overview]
Message-ID: <20130109134816.db51a820.akpm@linux-foundation.org> (raw)
In-Reply-To: <50EDE41C.7090107@iskon.hr>
On Wed, 09 Jan 2013 22:41:48 +0100
Zlatko Calusic <zlatko.calusic@iskon.hr> wrote:
> Currently we take a short nap (HZ/10) and wait for congestion to clear
> before taking another pass with lower priority in balance_pgdat(). But
> we do that only for the highest zone that we encounter is unbalanced
> and congested.
>
> This patch changes that to wait on all congested zones in a single
> pass in the hope that it will save us some scanning that way. Also we
> take a nap as soon as congested zone is encountered and sc.priority <
> DEF_PRIORITY - 2 (aka kswapd in trouble).
>
> ...
>
> The patch is against the mm tree. Make sure that
> mm-avoid-calling-pgdat_balanced-needlessly.patch is applied first (not
> yet in the mmotm tree). Tested on half a dozen systems with different
> workloads for the last few days, working really well!
But what are the user-observable effcets of this change? Less kernel
CPU consumption, presumably? Did you quantify it?
next prev parent reply other threads:[~2013-01-09 21:48 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-09 21:41 [PATCH] mm: wait for congestion to clear on all zones Zlatko Calusic
2013-01-09 21:41 ` Zlatko Calusic
2013-01-09 21:48 ` Andrew Morton [this message]
2013-01-09 21:48 ` Andrew Morton
2013-01-09 22:15 ` Zlatko Calusic
2013-01-09 22:15 ` Zlatko Calusic
2013-01-09 22:52 ` Zlatko Calusic
2013-01-09 22:52 ` Zlatko Calusic
2013-01-11 1:25 ` Simon Jeons
2013-01-11 1:25 ` Simon Jeons
2013-01-11 11:25 ` Zlatko Calusic
2013-01-11 11:25 ` Zlatko Calusic
2013-01-13 0:46 ` Simon Jeons
2013-01-13 0:46 ` Simon Jeons
2013-01-14 14:37 ` Zlatko Calusic
2013-01-14 14:37 ` Zlatko Calusic
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=20130109134816.db51a820.akpm@linux-foundation.org \
--to=akpm@linux-foundation.org \
--cc=hughd@google.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=mgorman@suse.de \
--cc=minchan.kim@gmail.com \
--cc=zlatko.calusic@iskon.hr \
/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.