From: Rik van Riel <riel@redhat.com>
To: Marcelo Tosatti <mtosatti@redhat.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Cc: Luiz Capitulino <lcapitulino@redhat.com>,
Linux RT Users <linux-rt-users@vger.kernel.org>
Subject: Re: [patch 2/2] MM: allow per-cpu vmstat_threshold and vmstat_worker configuration
Date: Tue, 25 Apr 2017 15:29:06 -0400 [thread overview]
Message-ID: <1493148546.31102.1.camel@redhat.com> (raw)
In-Reply-To: <20170425135846.203663532@redhat.com>
On Tue, 2017-04-25 at 10:57 -0300, Marcelo Tosatti wrote:
> The per-CPU vmstat worker is a problem on -RT workloads (because
> ideally the CPU is entirely reserved for the -RT app, without
> interference). The worker transfers accumulated per-CPUA
> vmstat counters to global counters.
>
> To resolve the problem, create two tunables:
>
> * Userspace configurable per-CPU vmstat threshold: by default theA
> VM code calculates the size of the per-CPU vmstat arrays. ThisA
> tunable allows userspace to configure the values.
>
> * Userspace configurable per-CPU vmstat worker: allow disabling
> the per-CPU vmstat worker.
>
> The patch below contains documentation which describes the tunables
> in more detail.
The documentation says what the tunables do, but
not how you should set them in different scenarios,
or why.
That could be a little more helpful to sysadmins.
--
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:[~2017-04-25 19:29 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-25 13:57 [patch 0/2] per-CPU vmstat thresholds and vmstat worker disablement Marcelo Tosatti
2017-04-25 13:57 ` [patch 1/2] MM: remove unused quiet_vmstat function Marcelo Tosatti
2017-04-25 13:57 ` [patch 2/2] MM: allow per-cpu vmstat_threshold and vmstat_worker configuration Marcelo Tosatti
2017-04-25 19:29 ` Rik van Riel [this message]
2017-04-25 19:36 ` Marcelo Tosatti
2017-05-02 14:28 ` Luiz Capitulino
2017-05-02 16:52 ` Marcelo Tosatti
2017-05-02 17:15 ` Luiz Capitulino
2017-05-02 17:21 ` Marcelo Tosatti
2017-05-11 15:37 ` Christoph Lameter
2017-05-12 12:27 ` Marcelo Tosatti
2017-05-12 15:11 ` Christoph Lameter
2017-05-12 15:40 ` Marcelo Tosatti
2017-05-12 16:03 ` Christoph Lameter
2017-05-12 16:07 ` Christoph Lameter
2017-05-12 16:19 ` Marcelo Tosatti
2017-05-12 16:57 ` Christoph Lameter
2017-05-15 19:15 ` Marcelo Tosatti
2017-05-16 13:37 ` Christoph Lameter
2017-05-19 14:34 ` Marcelo Tosatti
2017-05-19 17:13 ` Christoph Lameter
2017-05-19 17:49 ` Luiz Capitulino
2017-05-22 16:35 ` Christoph Lameter
2017-05-25 19:35 ` Marcelo Tosatti
2017-05-26 3:24 ` Christoph Lameter
2017-05-26 19:09 ` Marcelo Tosatti
2017-05-30 18:17 ` Christoph Lameter
2017-07-10 15:05 ` Marcelo Tosatti
2017-05-20 8:26 ` Marcelo Tosatti
2017-05-22 16:38 ` Christoph Lameter
2017-05-22 21:13 ` Marcelo Tosatti
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=1493148546.31102.1.camel@redhat.com \
--to=riel@redhat.com \
--cc=lcapitulino@redhat.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=linux-rt-users@vger.kernel.org \
--cc=mtosatti@redhat.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;
as well as URLs for NNTP newsgroup(s).