linux-kernel - 2.6.27-rc1-mm1: busyloop time-schedule

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Message-ID: <20080731122336.GA5511@martell.zuzino.mipt.ru>
Date:	Thu, 31 Jul 2008 16:23:36 +0400
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org
Subject: 2.6.27-rc1-mm1: busyloop time-schedule

The only suspicious thing so far is 100% CPU during "time-schedule" test
from LTP:

	[...]
pth_str03    0  INFO  :  thread 0 exiting, depth=4, status=0, addr=0xf2b010
pth_str03    0  INFO  :  The sum of tree (breadth 4, depth 3) is 3570
pth_str03    1  PASS  :  Test passed
<<<execution_status>>>
duration=0 termination_type=exited termination_id=0 corefile=no
cutime=0 cstime=3
<<<test_end>>>
<<<test_start>>>
tag=time-schedule01 stime=1217504927
cmdline="       time-schedule"

	[100% CPU here, reproducible]

"strace -p" kicks the test to completion, and shows plenty of
sched_yield() calls, IIRC.

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