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.
--
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>
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
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=513FD6F2.5060804@gmail.com \
--to=will.huckk@gmail.com \
--cc=hannes@cmpxchg.org \
--cc=linux-mm@kvack.org \
--cc=shentino@gmail.com \
/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.