linux-rt-users.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: "Mathias Koehrer" <mathias.koehrer@etas.com>
To: "linux-rt-users@vger.kernel.org" <linux-rt-users@vger.kernel.org>
Subject: Kernel thread's CPU affinity with isolcpus kernel boot argument
Date: Fri, 15 Jan 2016 12:15:28 +0100	[thread overview]
Message-ID: <5698D4D0.3020907@etas.com> (raw)

Hi all,

we use an Intel Core i7 machine (64bit) to use the cores > 0 for real 
time tasks.

For this the kernel boot parameter “isolcpus=1-31” is provided.
That works fine for all user space tasks.

However, I noticed that most kernel threads use the affinity mask 0xff.
I can change this by using “taskset”. However, I am wondering if there 
is mechanism that forces the kernel to consider the value of “isolcpus” 
also for kernel threads.

Kernel version in use is: 3.18.20-rt18.

Thanks for any feedback on this.

Best regards

Mathias


--
To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

             reply	other threads:[~2016-01-15 11:15 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-01-15 11:15 Mathias Koehrer [this message]
2016-02-25 14:18 ` Kernel thread's CPU affinity with isolcpus kernel boot argument Sebastian Andrzej Siewior
2016-02-25 14:43   ` Josh Cartwright
2016-02-26 10:53     ` Mathias Koehrer
2016-02-25 15:13   ` Daniel Bristot de Oliveira
2016-02-25 16:35     ` Sebastian Andrzej Siewior

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=5698D4D0.3020907@etas.com \
    --to=mathias.koehrer@etas.com \
    --cc=linux-rt-users@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 NNTP newsgroup(s).