Re: [PATCH v8 08/10] sched: add SD_PREFER_SIBLING for SMT level

Hi Vincent, On 14/10/31 下午4:47, 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.

What's the behavior before this patch?

Regards, Wanpeng Li

Signed-off-by: Vincent Guittot vincent.guittot@linaro.org Reviewed-by: Preeti U. Murthy preeti@linux.vnet.ibm.com

---

kernel/sched/core.c | 1 + 1 file changed, 1 insertion(+)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 37fb92c..731f2ad 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -6165,6 +6165,7 @@ 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% */