Re: [PATCH] proc-based cpu affinity user interface

From: Ingo Molnar (mingo@elte.hu)
Date: Tue Nov 27 2001 - 06:52:26 EST


On 26 Nov 2001, Robert Love wrote:

> Attached is my procfs-based implementation of a user interface for
> getting and setting a task's CPU affinity. Patch is against 2.4.16.

two comments. First, this has already been done - Andrew Morton has
written such a patch.

Second, as i've repeatedly said it, it's a failure to do this over /proc.
What if /proc is not mounted? What if the process is in a chroot()
environment, should it not be able to set its own affinity? This is a
fundamental limitation of your approach, and *if* we want to export the
cpus_allowed affinity to user-space (which is up to discussion), then the
right way (TM) to do it is via a syscall.

        Ingo

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/



This archive was generated by hypermail 2b29 : Fri Nov 30 2001 - 21:00:26 EST