From: Michal Hocko <mhocko@kernel.org>
To: Christoph Lameter <cl@linux.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>,
Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH] mm/vmstat: retrieve more accurate vmstat value
Date: Wed, 25 Nov 2015 19:03:50 +0100 [thread overview]
Message-ID: <20151125180350.GT27283@dhcp22.suse.cz> (raw)
In-Reply-To: <alpine.DEB.2.20.1511251002380.31590@east.gentwo.org>
On Wed 25-11-15 10:04:44, Christoph Lameter wrote:
> On Wed, 25 Nov 2015, Joonsoo Kim wrote:
>
> > I think that maintaining duplicate counter to guarantee accuracy isn't
> > reasonable solution. It would cause more overhead to the system.
>
> Simply remove the counter from the vmstat handling and do it differently
> then.
We definitely do not want yet another set of counters. vmstat counters
are not only to be exported into the userspace. We have in kernel users
as well. I do agree that there are users who can cope with some level of
imprecision though and those which depend on the accuracy can use
zone_page_state_snapshot which doesn't impose any overhead on others.
[...]
--
Michal Hocko
SUSE Labs
next prev parent reply other threads:[~2015-11-25 18:03 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-11-24 6:22 [PATCH] mm/vmstat: retrieve more accurate vmstat value Joonsoo Kim
2015-11-24 15:36 ` Christoph Lameter
2015-11-25 2:57 ` Joonsoo Kim
2015-11-25 16:04 ` Christoph Lameter
2015-11-25 18:03 ` Michal Hocko [this message]
2015-11-25 18:26 ` Christoph Lameter
2015-11-26 1:52 ` Joonsoo Kim
2015-12-03 4:14 ` Joonsoo Kim
2016-01-27 23:13 ` David Rientjes
2016-01-28 5:08 ` Joonsoo Kim
2015-11-25 12:00 ` Michal Hocko
2015-11-25 13:43 ` Vlastimil Babka
2015-11-25 13:47 ` Michal Hocko
2015-11-26 1:56 ` Joonsoo Kim
2015-11-26 5:03 ` vinayak menon
2015-11-26 15:03 ` Michal Hocko
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=20151125180350.GT27283@dhcp22.suse.cz \
--to=mhocko@kernel.org \
--cc=akpm@linux-foundation.org \
--cc=cl@linux.com \
--cc=iamjoonsoo.kim@lge.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
/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