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| author | Dave Kleikamp <shaggy@linux.vnet.ibm.com> | 2008-10-09 20:21:30 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-10-10 11:17:04 +0200 |
| commit | 5b7dba4ff834259a5623e03a565748704a8fe449 (patch) | |
| tree | 8fa9be3a308d1b5f2eb22d0a02dbe887a479ee3e /fs | |
| parent | sched debug: add name to sched_domain sysctl entries (diff) | |
| download | linux-5b7dba4ff834259a5623e03a565748704a8fe449.tar.xz linux-5b7dba4ff834259a5623e03a565748704a8fe449.zip | |
sched_clock: prevent scd->clock from moving backwards
When sched_clock_cpu() couples the clocks between two cpus, it may
increment scd->clock beyond the GTOD tick window that __update_sched_clock()
uses to clamp the clock. A later call to __update_sched_clock() may move
the clock back to scd->tick_gtod + TICK_NSEC, violating the clock's
monotonic property.
This patch ensures that scd->clock will not be set backward.
Signed-off-by: Dave Kleikamp <shaggy@linux.vnet.ibm.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'fs')
0 files changed, 0 insertions, 0 deletions