5.4-stable review patch. If anyone has any objections, please let me know.
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From: Vitalii Bursov vitaly@bursov.com
[ Upstream commit a1fd0b9d751f840df23ef0e75b691fc00cfd4743 ]
Change relax_domain_level checks so that it would be possible to include or exclude all domains from newidle balancing.
This matches the behavior described in the documentation:
-1 no request. use system default or follow request of others. 0 no search. 1 search siblings (hyperthreads in a core).
"2" enables levels 0 and 1, level_max excludes the last (level_max) level, and level_max+1 includes all levels.
Fixes: 1d3504fcf560 ("sched, cpuset: customize sched domains, core") Signed-off-by: Vitalii Bursov vitaly@bursov.com Signed-off-by: Ingo Molnar mingo@kernel.org Tested-by: Dietmar Eggemann dietmar.eggemann@arm.com Reviewed-by: Vincent Guittot vincent.guittot@linaro.org Reviewed-by: Valentin Schneider vschneid@redhat.com Link: https://lore.kernel.org/r/bd6de28e80073c79466ec6401cdeae78f0d4423d.171448850... Signed-off-by: Sasha Levin sashal@kernel.org --- kernel/cgroup/cpuset.c | 2 +- kernel/sched/topology.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c index 5d50ac2f26525..6ec74b9120b75 100644 --- a/kernel/cgroup/cpuset.c +++ b/kernel/cgroup/cpuset.c @@ -1868,7 +1868,7 @@ bool current_cpuset_is_being_rebound(void) static int update_relax_domain_level(struct cpuset *cs, s64 val) { #ifdef CONFIG_SMP - if (val < -1 || val >= sched_domain_level_max) + if (val < -1 || val > sched_domain_level_max + 1) return -EINVAL; #endif
diff --git a/kernel/sched/topology.c b/kernel/sched/topology.c index 844dc30fc5593..fc0dcc812a07b 100644 --- a/kernel/sched/topology.c +++ b/kernel/sched/topology.c @@ -1205,7 +1205,7 @@ static void set_domain_attribute(struct sched_domain *sd, } else request = attr->relax_domain_level;
- if (sd->level > request) { + if (sd->level >= request) { /* Turn off idle balance on this domain: */ sd->flags &= ~(SD_BALANCE_WAKE|SD_BALANCE_NEWIDLE); }