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?
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next prev parent reply other threads:[~2013-01-09 21:48 UTC|newest]
Thread overview: 8+ 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 21:48 ` Andrew Morton [this message]
2013-01-09 22:15 ` Zlatko Calusic
2013-01-09 22:52 ` Zlatko Calusic
2013-01-11 1:25 ` Simon Jeons
2013-01-11 11:25 ` Zlatko Calusic
2013-01-13 0:46 ` Simon Jeons
2013-01-14 14:37 ` Zlatko Calusic
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