From: Will Huck <will.huckk@gmail.com>
To: Johannes Weiner <hannes@cmpxchg.org>
Cc: Raymond Jennings <shentino@gmail.com>,
Linux Memory Management List <linux-mm@kvack.org>
Subject: Re: Swap defragging
Date: Wed, 13 Mar 2013 09:31:30 +0800 [thread overview]
Message-ID: <513FD6F2.5060804@gmail.com> (raw)
In-Reply-To: <20130312165247.GB1953@cmpxchg.org>
Hi Johannes,
On 03/13/2013 12:52 AM, Johannes Weiner wrote:
> On Sat, Mar 09, 2013 at 10:00:37AM +0800, Will Huck wrote:
>> Hi Johannes,
>> On 03/08/2013 10:35 AM, Johannes Weiner wrote:
>>> On Thu, Mar 07, 2013 at 06:07:23PM -0800, Raymond Jennings wrote:
>>>> Just a two cent question, but is there any merit to having the kernel
>>>> defragment swap space?
>>> That is a good question.
>>>
>>> Swap does fragment quite a bit, and there are several reasons for
>>> that.
>> Are there any tools to test and monitor swap subsystem and page
>> reclaim subsystem?
pgscan_kswapd_dma 0
pgscan_kswapd_dma32 0
pgscan_kswapd_normal 0
pgscan_kswapd_movable 0
pgscan_direct_dma 0
pgscan_direct_dma32 0
pgscan_direct_normal 0
pgscan_direct_movable 0
pgscan_direct_throttle 0
zone_reclaim_failed 0
pginodesteal 0
slabs_scanned 328704
slab cache is scaned but file-backed/swap-backed pages are not scanned, why?
> seekwatcher is great to see the IO patterns. Anything that uses
> anonymous memory can test swap: a java job, multiplying matrixes,
> kernel builds etc. I mostly log /proc/vmstat by taking snapshots at a
> regular interval during the workload, then plot and visually correlate
> the swapin/swapout counters with the individual LRU sizes, page fault
> rate, what have you, to get a feeling for what it's doing.
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next prev parent reply other threads:[~2013-03-13 1:31 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-08 2:07 Swap defragging Raymond Jennings
2013-03-08 2:35 ` Johannes Weiner
2013-03-08 3:01 ` Raymond Jennings
2013-03-09 2:00 ` Will Huck
2013-03-12 16:52 ` Johannes Weiner
2013-03-13 0:46 ` Will Huck
2013-03-13 1:31 ` Will Huck [this message]
2013-03-11 2:54 ` Ric Mason
2013-03-12 16:53 ` Johannes Weiner
2013-03-11 3:11 ` Simon Jeons
2013-03-12 17:03 ` Johannes Weiner
2013-03-11 3:16 ` Jaegeuk Hanse
2013-03-12 17:08 ` Johannes Weiner
2013-03-13 3:47 ` Jaegeuk Hanse
2013-03-11 6:24 ` Will Huck
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