linux-kernel - Re: [RFC 0/2] /proc/sched_stat and /proc/sched

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Message-ID: <20121107003757.GM2616@ZenIV.linux.org.uk>
Date:	Wed, 7 Nov 2012 00:37:57 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Nathan Zimmer <nzimmer@....com>
Cc:	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC 0/2] /proc/sched_stat and /proc/sched_debug fail at 4096

On Tue, Nov 06, 2012 at 03:02:19PM -0600, Nathan Zimmer wrote:
> When running with 4096 cores attemping to read /proc/sched_stat and
> /proc/sched_debug will fail with an ENOMEM condition.
> On a sufficantly large systems the total amount of data is more then 4mb, so
> it won't fit into a single buffer. 

Not a bad idea, but the iterator is wrong - it assumes that CPU 0 is always
online, AFAICS.  Header should be handled separately - see my reply to
davej several hours ago.
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