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authorHidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>2009-11-26 14:48:30 +0900
committerIngo Molnar <mingo@elte.hu>2009-11-26 12:59:19 +0100
commitd180c5bccec02612256fd8076ff3c1fac3429553 (patch)
tree1ef4a45c81531645640380965916c68bbe7f6abb /kernel/pid.c
parent16bc67edeb49b531940b2ba6c183780a1b5c472d (diff)
sched: Introduce task_times() to replace task_{u,s}time() pair
Functions task_{u,s}time() are called in pair in almost all cases. However task_stime() is implemented to call task_utime() from its inside, so such paired calls run task_utime() twice. It means we do heavy divisions (div_u64 + do_div) twice to get utime and stime which can be obtained at same time by one set of divisions. This patch introduces a function task_times(*tsk, *utime, *stime) to retrieve utime and stime at once in better, optimized way. Signed-off-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com> Acked-by: Peter Zijlstra <peterz@infradead.org> Cc: Stanislaw Gruszka <sgruszka@redhat.com> Cc: Spencer Candland <spencer@bluehost.com> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Balbir Singh <balbir@in.ibm.com> Cc: Americo Wang <xiyou.wangcong@gmail.com> LKML-Reference: <4B0E16AE.906@jp.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/pid.c')
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