From: Andreas Hollmann <hollmann@in.tum.de>
To: linux-numa <linux-numa@vger.kernel.org>
Subject: Is there a way to trigger numa_balancing instantly?
Date: Thu, 8 May 2014 18:13:06 +0200 [thread overview]
Message-ID: <CAGz0_-1-Nq1ttEHHoBDRUs57w-nEdmFvo6ZR+5y6imT3woRGbw@mail.gmail.com> (raw)
Hi,
is there a way to trigger numa_balancing instantly?
For applications that consist of several phases it
would be very useful to trigger numa_balancing
instantly instead of waiting until it will be triggered
automatically after a certain delay.
The application could trigger a balancing operation
when it comes from one phase to next phase and
these two phases have completely different memory
access patterns.
Would it be possible to integrate a new sysctl
that triggers the balancing for a certain pid?
Something like
echo $PID > /proc/sys/kernel/numa_balancing_now_pid
or
echo 1 > /proc/$PID/numa_balancing_now
numa_balancing could be disabled globally and only triggerd
in certain conditions. Additionally it would be nice to
enable periodic numa_balancing only for certain processes and
not globally.
echo 1 > /proc/$PID/numa_balancing
What do you think?
--
Following sysctls are provided by numa_balancing
in /proc/sys/kernel
numa_balancing 0
numa_balancing_migrate_deferred 16
numa_balancing_scan_delay_ms 1000
numa_balancing_scan_period_max_ms 60000
numa_balancing_scan_period_min_ms 1000
numa_balancing_scan_size_mb 256
In https://www.kernel.org/doc/Documentation/sysctl/kernel.txt
numa_balancing_settle_count is mentioned, but it seems that it
disappeared, at least in on my kernel version (3.14).
Best regards,
Andreas Hollmann
reply other threads:[~2014-05-08 16:13 UTC|newest]
Thread overview: [no followups] expand[flat|nested] mbox.gz Atom feed
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=CAGz0_-1-Nq1ttEHHoBDRUs57w-nEdmFvo6ZR+5y6imT3woRGbw@mail.gmail.com \
--to=hollmann@in.tum.de \
--cc=linux-numa@vger.kernel.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;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).