Let the processes which lose they original cpus run on housekeeping cpus if they can to reduce disturbances on nohz_full cpus.
Cc: Thomas Gleixner <[email protected]> Cc: Christoph Lameter <[email protected]> Cc: Kevin Hilman <[email protected]> Cc: Mike Galbraith <[email protected]> Cc: Viresh Kumar <[email protected]> Cc: Frederic Weisbecker <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: Peter Zijlstra <[email protected]> Signed-off-by: Lai Jiangshan <[email protected]> --- kernel/sched/core.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index f0f831e..f9ef41a 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -1286,7 +1286,7 @@ static int select_fallback_rq(int cpu, struct task_struct *p) { int nid = cpu_to_node(cpu); const struct cpumask *nodemask = NULL; - enum { cpuset, possible, fail } state = cpuset; + enum { cpuset, housekeeping, possible, fail } state = cpuset; int dest_cpu; /* @@ -1322,8 +1322,15 @@ static int select_fallback_rq(int cpu, struct task_struct *p) case cpuset: /* No more Mr. Nice Guy. */ cpuset_cpus_allowed_fallback(p); + state = housekeeping; + break; + + case housekeeping: +#ifdef CONFIG_NO_HZ_FULL + do_set_cpus_allowed(p, housekeeping_mask); state = possible; break; +# endif /* CONFIG_NO_HZ_FULL. Fallthrough when !CONFIG_NO_HZ_FULL */ case possible: do_set_cpus_allowed(p, cpu_possible_mask); -- 2.1.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
