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authorSalman Qazi <sqazi@google.com>2011-11-15 14:12:06 -0800
committerIngo Molnar <mingo@elte.hu>2011-11-16 19:51:25 +0100
commit4cecf6d401a01d054afc1e5f605bcbfe553cb9b9 (patch)
tree58978cec1b0757fde61e53c974dff062010713df /include/linux/init_task.h
parentfccfdc6f0d8c83c854eeb6d93aa158f0e551bd49 (diff)
sched, x86: Avoid unnecessary overflow in sched_clock
(Added the missing signed-off-by line) In hundreds of days, the __cycles_2_ns calculation in sched_clock has an overflow. cyc * per_cpu(cyc2ns, cpu) exceeds 64 bits, causing the final value to become zero. We can solve this without losing any precision. We can decompose TSC into quotient and remainder of division by the scale factor, and then use this to convert TSC into nanoseconds. Signed-off-by: Salman Qazi <sqazi@google.com> Acked-by: John Stultz <johnstul@us.ibm.com> Reviewed-by: Paul Turner <pjt@google.com> Cc: stable@kernel.org Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/20111115221121.7262.88871.stgit@dungbeetle.mtv.corp.google.com Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/linux/init_task.h')
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