From: Mel Gorman <mgorman@suse.de>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Linux Kernel <linux-kernel@vger.kernel.org>,
Linux-MM <linux-mm@kvack.org>,
Linux-FSDevel <linux-fsdevel@vger.kernel.org>,
Johannes Weiner <hannes@cmpxchg.org>
Subject: Re: [PATCH 4/4] mm: page_alloc: Reduce cost of the fair zone allocation policy
Date: Tue, 1 Jul 2014 09:02:05 +0100 [thread overview]
Message-ID: <20140701080205.GT10819@suse.de> (raw)
In-Reply-To: <20140630150914.6db3805c28c60283deb94206@linux-foundation.org>
On Mon, Jun 30, 2014 at 03:09:14PM -0700, Andrew Morton wrote:
> On Mon, 30 Jun 2014 22:51:21 +0100 Mel Gorman <mgorman@suse.de> wrote:
>
> > > That's a large change in system time. Does this all include kswapd
> > > activity?
> > >
> >
> > I don't have a profile to quantify that exactly. It takes 7 hours to
> > complete a test on that machine in this configuration
>
> That's nuts. Why should measuring this require more than a few minutes?
That's how long the full test takes to complete for each part of the IO
test. Profiling a subsection of it will miss some parts with no
guarantee the sampled subset is representative. Profiling for smaller
amounts of IO so the test completes quickly does not guarantee that the
sample is representative. Reducing the size of memory of the machine
using any tricks is also not representative etc.
--
Mel Gorman
SUSE Labs
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next prev parent reply other threads:[~2014-07-01 8:02 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-06-30 16:47 [PATCH 0/5] Improve sequential read throughput v4r8 Mel Gorman
2014-06-30 16:48 ` [PATCH 1/4] mm: pagemap: Avoid unnecessary overhead when tracepoints are deactivated Mel Gorman
2014-06-30 16:48 ` [PATCH 2/4] mm: Rearrange zone fields into read-only, page alloc, statistics and page reclaim lines Mel Gorman
2014-06-30 16:48 ` [PATCH 3/4] mm: vmscan: Do not reclaim from lower zones if they are balanced Mel Gorman
2014-06-30 16:48 ` [PATCH 4/4] mm: page_alloc: Reduce cost of the fair zone allocation policy Mel Gorman
2014-06-30 21:14 ` Andrew Morton
2014-06-30 21:51 ` Mel Gorman
2014-06-30 22:09 ` Andrew Morton
2014-07-01 8:02 ` Mel Gorman [this message]
2014-07-01 17:16 ` [PATCH 0/5] Improve sequential read throughput v4r8 Johannes Weiner
2014-07-01 18:39 ` Mel Gorman
2014-07-01 20:58 ` Mel Gorman
2014-07-01 21:25 ` Johannes Weiner
2014-07-02 15:44 ` Johannes Weiner
2014-07-02 15:53 ` Mel Gorman
2014-07-01 22:38 ` Dave Chinner
2014-07-01 23:09 ` Mel Gorman
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