From: Wu Fengguang <fengguang.wu@intel.com>
To: Iram Shahzad <iram.shahzad@jp.fujitsu.com>
Cc: Mel Gorman <mel@csn.ul.ie>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Subject: Re: compaction: trying to understand the code
Date: Thu, 19 Aug 2010 15:45:04 +0800 [thread overview]
Message-ID: <20100819074504.GA17393@localhost> (raw)
In-Reply-To: <565A4EE71DAC4B1A820B2748F56ABF73@rainbow>
On Thu, Aug 19, 2010 at 03:09:38PM +0800, Iram Shahzad wrote:
> > The loop should be waiting for the _other_ processes (doing direct
> > reclaims) to proceed. When there are _lots of_ ongoing page
> > allocations/reclaims, it makes sense to wait for them to calm down a bit?
>
> I have noticed that if I run other process, it helps the loop to exit.
> So is this (ie hanging until other process helps) intended behaviour?
>
> Also, the other process does help the loop to exit, but again it enters
> the loop and the compaction is never finished. That is, the process
> looks like hanging. Is this intended behaviour?
> What will improve this situation?
What's your /proc/vmstat? Does your system have thousands of
processes allocating memory concurrently? I'd like to make sure the
too_many_isolated() test is working as expected..
Thanks,
Fengguang
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next prev parent reply other threads:[~2010-08-19 7:45 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-08-17 11:08 compaction: trying to understand the code Iram Shahzad
2010-08-17 11:10 ` Mel Gorman
2010-08-18 8:19 ` Iram Shahzad
2010-08-18 15:41 ` Wu Fengguang
2010-08-19 7:09 ` Iram Shahzad
2010-08-19 7:45 ` Wu Fengguang [this message]
2010-08-19 7:46 ` Mel Gorman
2010-08-19 8:08 ` Wu Fengguang
2010-08-19 8:15 ` Mel Gorman
2010-08-19 8:29 ` Wu Fengguang
2010-08-20 5:45 ` Iram Shahzad
2010-08-20 5:50 ` Wu Fengguang
2010-08-20 6:13 ` Iram Shahzad
2010-08-19 16:00 ` Minchan Kim
2010-08-20 5:31 ` Iram Shahzad
2010-08-20 5:34 ` Wu Fengguang
2010-08-20 9:35 ` Mel Gorman
2010-08-20 10:22 ` Minchan Kim
2010-08-22 15:31 ` Minchan Kim
2010-08-22 23:23 ` Wu Fengguang
2010-08-23 1:58 ` Minchan Kim
2010-08-23 3:03 ` Iram Shahzad
2010-08-23 9:10 ` Minchan Kim
2010-08-26 8:51 ` Mel Gorman
2010-08-23 7:18 ` Mel Gorman
2010-08-23 17:14 ` Minchan Kim
2010-08-24 0:27 ` Wu Fengguang
2010-08-24 5:07 ` Iram Shahzad
2010-08-24 6:52 ` Minchan Kim
2010-08-26 8:05 ` Iram Shahzad
2010-08-23 7:16 ` Mel Gorman
2010-08-23 9:07 ` Minchan Kim
2010-08-20 10:23 ` Wu Fengguang
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