printk/sched: Introduce special printk_sched() for those awkward moments

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There's a few awkward printk()s inside of scheduler guts that people
prefer to keep but really are rather deadlock prone. Fudge around it
by storing the text in a per-cpu buffer and poll it using the existing
printk_tick() handler.

This will drop output when its more frequent than once a tick, however
only the affinity thing could possible go that fast and for that just
one should suffice to notify the admin he's done something silly..

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: http://lkml.kernel.org/n/tip-wua3lmkt3dg8nfts66o6brne@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@elte.hu>

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This commit is contained in:

Peter Zijlstra 2012-02-27 10:47:00 +01:00 • committed by Ingo Molnar

parent 554cecaf73

commit 3ccf3e8306

4 changed files with 55 additions and 5 deletions

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10

include/linux/printk.h

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38

kernel/printk.c

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2

kernel/sched/core.c

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8

kernel/sched/rt.c

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