From: Nathan Zimmer <nzimmer@sgi.com>
Date: Thu, 21 Feb 2013 23:15:08 +0000 (-0800)
Subject: sched: Fix /proc/sched_stat failure on very very large systems
X-Git-Tag: v3.9-rc1~62^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=cb152ff26717961b10d0888cd983ba284cb99cd1;p=pandora-kernel.git

sched: Fix /proc/sched_stat failure on very very large systems

On systems with 4096 cores doing a cat /proc/sched_stat fails,
because we are trying to push all the data into a single kmalloc
buffer.

The issue is on these very large machines all the data will not
fit in 4mb.

A better solution is to not use the single_open() mechanism but
to provide our own seq_operations.

The output should be identical to previous version and thus not
need the version number.

Reported-by: Dave Jones <davej@redhat.com>
Signed-off-by: Nathan Zimmer <nzimmer@sgi.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Wu Fengguang <fengguang.wu@intel.com>
[ Fix memleak]
[ Fix spello in comment]
[ Fix warnings]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---

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