sched_clock: only update deltas with local reads.

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Reading the CPU clock should try to stay accurate within the CPU.
By reading the CPU clock from another CPU and updating the deltas can
cause unneeded jumps when reading from the local CPU.

This patch changes the code to update the last read TSC only when read
from the local CPU.

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>
Cc: john stultz <johnstul@us.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

...

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Steven Rostedt 2008-07-09 00:15:31 -04:00 • committed by Ingo Molnar

parent 2b8a0cf489

commit c0c87734f1

1 changed files with 16 additions and 9 deletions

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kernel/sched_clock.c

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