diff options
| author | Srinath Sridharan <srinathsr@google.com> | 2016-07-14 09:57:29 +0100 |
|---|---|---|
| committer | John Stultz <john.stultz@linaro.org> | 2016-08-10 15:15:39 -0700 |
| commit | 2e9abbc942e6211f9ac4dadb14debc39bb9d1418 (patch) | |
| tree | 682bcb1b4e811e1d103b7c53e68c78d3169dd797 /include/linux/sched/sysctl.h | |
| parent | d753e92e19660a6adcc3b8e0076a6c6078e5f59d (diff) | |
sched: EAS: take cstate into account when selecting idle core
Introduce a new sysctl for this option, 'sched_cstate_aware'.
When this is enabled, select_idle_sibling in CFS is modified to
choose the idle CPU in the sibling group which has the lowest
idle state index - idle state indexes are assumed to increase
as sleep depth and hence wakeup latency increase. In this way,
we attempt to minimise wakeup latency when an idle CPU is
required.
Signed-off-by: Srinath Sridharan <srinathsr@google.com>
Includes:
sched: EAS: fix select_idle_sibling
when sysctl_sched_cstate_aware is enabled, best_idle cpu will not be chosen
in the original flow because it will goto done directly
Bug: 30107557
Change-Id: Ie09c2e3960cafbb976f8d472747faefab3b4d6ac
Signed-off-by: martin_liu <martin_liu@htc.com>
Diffstat (limited to 'include/linux/sched/sysctl.h')
| -rw-r--r-- | include/linux/sched/sysctl.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/sched/sysctl.h b/include/linux/sched/sysctl.h index 4479e48c7712..7d021393b0da 100644 --- a/include/linux/sched/sysctl.h +++ b/include/linux/sched/sysctl.h @@ -39,6 +39,7 @@ extern unsigned int sysctl_sched_latency; extern unsigned int sysctl_sched_min_granularity; extern unsigned int sysctl_sched_wakeup_granularity; extern unsigned int sysctl_sched_child_runs_first; +extern unsigned int sysctl_sched_cstate_aware; enum sched_tunable_scaling { SCHED_TUNABLESCALING_NONE, |