linux-kernel - Re: [PATCH] PROC_FS: get and set the smp affinity of tasks by read-write /proc/<pid>/smp

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Date:	Thu, 10 Jan 2008 10:25:26 +0800
From:	"rae l" <crquan@...il.com>
To:	"Andrew Morton" <akpm@...ux-foundation.org>
Cc:	viro@...iv.linux.org.uk, torvalds@...ux-foundation.org,
	linux-kernel@...r.kernel.org, emdow@...ibm.com
Subject: Re: [PATCH] PROC_FS: get and set the smp affinity of tasks by read-write /proc/<pid>/smp_affinity

On Jan 10, 2008 8:33 AM, Andrew Morton <akpm@...ux-foundation.org> wrote:
> On Fri,  4 Jan 2008 15:03:41 +0800
> Denis Cheng <crquan@...il.com> wrote:
>
> > this adds a read-write /proc/<pid>/smp_affinity entry,
> > just like what /proc/irq/<irq>/smp_affinity does,
> > so now we can get and set the affinity of tasks by procfs,
> > this is especially useful used in shell scripts.
> >
> > this also adds a read-write /proc/<pid>/tasks/<tid>/smp_affinity
> > for the same purpose.
>
> Why not use /usr/bin/taskset?
I know /usr/bin/tasklet is another way to set smp affinity of a task,
it uses the sched_{set,get}affinity system call binary interface, but
add a /proc/<pid>/smp_affinity could give a new choice; and this keeps
consistency with /proc/irq/<irq>/smp_affinity, will be familiar to
most people.

Another way, the sysctl system call binary interface has been marked
deprecated recently, only /proc/sys/ operating interface left; I
wonder this this would be a tendency of virtual filesystem interface
to replace binary interface? In my opinion, vfs text interface is
always better than system call binary interface.

>

-- 
Denis Cheng
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