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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


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             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

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