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| author | Paul Turner <[email protected]> | 2011-07-06 02:07:21 +0000 |
|---|---|---|
| committer | Ingo Molnar <[email protected]> | 2011-07-21 16:01:43 +0000 |
| commit | 9bbd7374361d9bfc75108c3ad1c1b6db28b1be59 (patch) | |
| tree | d787a387a2a2e3d8c0476b79ae57dd217098763f /security/selinux/hooks.c | |
| parent | Merge branch 'linus' into sched/core (diff) | |
| download | kernel-9bbd7374361d9bfc75108c3ad1c1b6db28b1be59.tar.gz kernel-9bbd7374361d9bfc75108c3ad1c1b6db28b1be59.zip | |
sched: update correct entity's runtime in check_preempt_wakeup()
While looking at check_preempt_wakeup() I realized that we are
potentially updating the wrong entity in the fair-group scheduling
case. In this case the current task's cfs_rq may not be the same as
the one used for the comparison between the waking task and the
existing task's vruntime.
This potentially results in us using a stale vruntime in the
pre-emption decision, providing a small false preference for the
previous task. The effects of this are bounded since we always
perform a hierarchal update on the tick.
Signed-off-by: Paul Turner <[email protected]>
Signed-off-by: Peter Zijlstra <[email protected]>
Link: http://lkml.kernel.org/r/CAPM31R+2Ke2urUZKao5W92_LupdR4AYEv-EZWiJ3tG=tEes2cw@mail.gmail.com
Signed-off-by: Ingo Molnar <[email protected]>
Diffstat (limited to 'security/selinux/hooks.c')
0 files changed, 0 insertions, 0 deletions