linux-kernel - Re: getting processor numbers

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Date:	Tue, 3 Apr 2007 19:55:38 -0700
From:	Paul Jackson <pj@....com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	drepper@...hat.com, linux-kernel@...r.kernel.org, ego@...ibm.com,
	dipankar@...ibm.com, mingo@...e.hu, oleg@...sign.ru
Subject: Re: getting processor numbers

Andrew wrote:
> > But all this of course does not solve the issue sysconf() has.  In
> > sysconf we cannot use sched_getaffinity since all the systems CPUs must
> > be reported.
> 
> OK.
> 
> This is excecptionally gruesome, but one could run sched_getaffinity()
> against pid 1 (init).  Which will break nicely in the OS-virtualised future
> when the system has multiple pid-1-inits running in containers...

That nicely breaks on typical cpuset managed systems as well, which
frequently put init into a small cpuset (with the classic Unix daemon
and login load), leaving the bulk of the system to be managed by a
batch scheduler.

-- 
                  I won't rest till it's the best ...
                  Programmer, Linux Scalability
                  Paul Jackson <pj@....com> 1.925.600.0401
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