This issue is resolved by 
this upstream patch:

author  Mike Galbraith <efa...@gmx.de>  
        Tue, 30 Mar 2010 09:09:53 +0000 (11:09 +0200)
committer       Ingo Molnar <mi...@elte.hu>     
        Fri, 2 Apr 2010 18:06:40 +0000 (20:06 +0200)
commit  269484a492d9177072ee11ec8c9bff71d256837a
tree    4910c802ac71e70a6e722d7f0bd5119962304f80        tree | snapshot
parent  42be79e37e264557f12860fa4cc84b4de3685954        commit | diff
sched: Fix proc_sched_set_task()

Latencytop clearing sum_exec_runtime via proc_sched_set_task() breaks
task_times().  Other places in kernel use nvcsw and nivcsw, which are
being cleared as well,  Clear task statistics only.

Reported-by: Török Edwin <edwinto...@gmail.com>
Signed-off-by: Mike Galbraith <efa...@gmx.de>
Cc: Hidetoshi Seto <seto.hideto...@jp.fujitsu.com>
Cc: Arjan van de Ven <ar...@infradead.org>
Signed-off-by: Peter Zijlstra <a.p.zijls...@chello.nl>
LKML-Reference: <1269940193.19286.14.ca...@marge.simson.net>
Signed-off-by: Ingo Molnar <mi...@elte.hu>






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