From: Michal Hocko <mhocko@kernel.org>
To: Tim Chen <tim.c.chen@linux.intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Vladimir Davydov <vdavydov@virtuozzo.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Minchan Kim <minchan@kernel.org>, Hugh Dickins <hughd@google.com>,
"Kirill A.Shutemov" <kirill.shutemov@linux.intel.com>,
Andi Kleen <andi@firstfloor.org>, Aaron Lu <aaron.lu@intel.com>,
Huang Ying <ying.huang@intel.com>, linux-mm <linux-mm@kvack.org>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 0/7] mm: Improve swap path scalability with batched operations
Date: Wed, 4 May 2016 14:45:35 +0200 [thread overview]
Message-ID: <20160504124535.GJ29978@dhcp22.suse.cz> (raw)
In-Reply-To: <1462309239.21143.6.camel@linux.intel.com>
On Tue 03-05-16 14:00:39, Tim Chen wrote:
[...]
> include/linux/swap.h | 29 ++-
> mm/swap_state.c | 253 +++++++++++++-----
> mm/swapfile.c | 215 +++++++++++++--
> mm/vmscan.c | 725 ++++++++++++++++++++++++++++++++++++++-------------
> 4 files changed, 945 insertions(+), 277 deletions(-)
This is rather large change for a normally rare path. We have been
trying to preserve the anonymous memory as much as possible and rather
push the page cache out. In fact swappiness is ignored most of the
time for the vast majority of workloads.
So this would help anonymous mostly workloads and I am really wondering
whether this is something worth bothering without further and deeper
rethinking of our current reclaim strategy. I fully realize that the
swap out sucks and that the new storage technologies might change the
way how we think about anonymous memory being so "special" wrt. disk
based caches but I would like to see a stronger use case than "we have
been playing with some artificial use case and it scales better"
--
Michal Hocko
SUSE Labs
--
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:[~2016-05-04 12:45 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <cover.1462306228.git.tim.c.chen@linux.intel.com>
2016-05-03 21:00 ` Tim Chen
2016-05-04 12:45 ` Michal Hocko [this message]
2016-05-04 17:13 ` Tim Chen
2016-05-04 19:49 ` Michal Hocko
2016-05-04 21:05 ` Andi Kleen
2016-05-04 21:25 ` Johannes Weiner
2016-05-05 0:08 ` Minchan Kim
2016-05-05 7:49 ` Michal Hocko
2016-05-05 15:56 ` Tim Chen
2016-05-03 21:01 ` [PATCH 1/7] mm: Cleanup - Reorganize the shrink_page_list code into smaller functions Tim Chen
2016-05-27 16:40 ` Tim Chen
2016-05-30 8:48 ` Michal Hocko
2016-05-03 21:01 ` [PATCH 2/7] mm: Group the processing of anonymous pages to be swapped in shrink_page_list Tim Chen
2016-05-03 21:02 ` [PATCH 3/7] mm: Add new functions to allocate swap slots in batches Tim Chen
2016-05-03 21:02 ` [PATCH 4/7] mm: Shrink page list batch allocates swap slots for page swapping Tim Chen
2016-05-03 21:02 ` [PATCH 5/7] mm: Batch addtion of pages to swap cache Tim Chen
2016-05-03 21:03 ` [PATCH 6/7] mm: Cleanup - Reorganize code to group handling of page Tim Chen
2016-05-03 21:03 ` [PATCH 7/7] mm: Batch unmapping of pages that are in swap cache Tim Chen
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=20160504124535.GJ29978@dhcp22.suse.cz \
--to=mhocko@kernel.org \
--cc=aaron.lu@intel.com \
--cc=akpm@linux-foundation.org \
--cc=andi@firstfloor.org \
--cc=hannes@cmpxchg.org \
--cc=hughd@google.com \
--cc=kirill.shutemov@linux.intel.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=minchan@kernel.org \
--cc=tim.c.chen@linux.intel.com \
--cc=vdavydov@virtuozzo.com \
--cc=ying.huang@intel.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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox