Re: [PATCH v6 6/6] sched: add SD_PREFER_SIBLING for SMT level

Preeti U Murthy
2014-09-24T12:28:09Z

On 09/23/2014 09:38 PM, Vincent Guittot wrote:
> add the SD_PREFER_SIBLING flag for SMT level in order to ensure that
> the scheduler will put at least 1 task per core.
>
> Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>
> ---
> kernel/sched/core.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/kernel/sched/core.c b/kernel/sched/core.c
> index c7c8ac4..f72663e 100644
> --- a/kernel/sched/core.c
> +++ b/kernel/sched/core.c
> @@ -6134,6 +6134,7 @@ sd_init(struct sched_domain_topology_level *tl, int cpu)
> */
>
> if (sd->flags & SD_SHARE_CPUCAPACITY) {
> + sd->flags |= SD_PREFER_SIBLING;
> sd->imbalance_pct = 110;
> sd->smt_gain = 1178; /* ~15% */
>
Reviewed-by: Preeti U. Murthy <preeti@linux.vnet.ibm.com>