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authorSteven Rostedt <rostedt@goodmis.org>2008-07-07 14:16:51 -0400
committerIngo Molnar <mingo@elte.hu>2008-07-11 15:53:25 +0200
commitf7cce27f5605b9e137b829a47949cb2d3c7e1cab (patch)
treefbe270ccfb5cee3d055a52b6351ade2d34c5d74b /kernel/time
parent62c43dd9864dbd52ff158922d1d08c75f20335af (diff)
sched_clock: widen the max and min time
With keeping the max and min sched time within one jiffy of the gtod clock was too tight. Just before a schedule tick the max could easily be hit, as well as just after a schedule_tick the min could be hit. This caused the clock to jump around by a jiffy. This patch widens the minimum to last gtod + (delta_jiffies ? delta_jiffies - 1 : 0) * TICK_NSECS and the maximum to last gtod + (2 + delta_jiffies) * TICK_NSECS This keeps the minum to gtod or if one jiffy less than delta jiffies and the maxim 2 jiffies ahead of gtod. This may cause unstable TSCs to be a bit more sporadic, but it helps keep a clock with a stable TSC working well. Signed-off-by: Steven Rostedt <srostedt@redhat.com> Cc: Steven Rostedt <srostedt@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/time')
0 files changed, 0 insertions, 0 deletions