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[v11,02/16] cpuset: Don't use the cpu_possible_mask as a last resort for cgroup v1

Message ID 20210730112443.23245-3-will@kernel.org (mailing list archive)
State New, archived
Headers show
Series Add support for 32-bit tasks on asymmetric AArch32 systems | expand

Commit Message

Will Deacon July 30, 2021, 11:24 a.m. UTC
If the scheduler cannot find an allowed CPU for a task,
cpuset_cpus_allowed_fallback() will widen the affinity to cpu_possible_mask
if cgroup v1 is in use.

In preparation for allowing architectures to provide their own fallback
mask, just return early if we're either using cgroup v1 or we're using
cgroup v2 with a mask that contains invalid CPUs. This will allow
select_fallback_rq() to figure out the mask by itself.

Cc: Tejun Heo <tj@kernel.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: Valentin Schneider <valentin.schneider@arm.com>
Reviewed-by: Quentin Perret <qperret@google.com>
Signed-off-by: Will Deacon <will@kernel.org>
 include/linux/cpuset.h | 1 +
 kernel/cgroup/cpuset.c | 8 ++++++--
 2 files changed, 7 insertions(+), 2 deletions(-)
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diff --git a/include/linux/cpuset.h b/include/linux/cpuset.h
index 04c20de66afc..ed6ec677dd6b 100644
--- a/include/linux/cpuset.h
+++ b/include/linux/cpuset.h
@@ -15,6 +15,7 @@ 
 #include <linux/cpumask.h>
 #include <linux/nodemask.h>
 #include <linux/mm.h>
+#include <linux/mmu_context.h>
 #include <linux/jump_label.h>
diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c
index adb5190c4429..6000d7fbf5da 100644
--- a/kernel/cgroup/cpuset.c
+++ b/kernel/cgroup/cpuset.c
@@ -3322,9 +3322,13 @@  void cpuset_cpus_allowed(struct task_struct *tsk, struct cpumask *pmask)
 void cpuset_cpus_allowed_fallback(struct task_struct *tsk)
+	const struct cpumask *cs_mask;
+	const struct cpumask *possible_mask = task_cpu_possible_mask(tsk);
-	do_set_cpus_allowed(tsk, is_in_v2_mode() ?
-		task_cs(tsk)->cpus_allowed : cpu_possible_mask);
+	cs_mask = task_cs(tsk)->cpus_allowed;
+	if (is_in_v2_mode() && cpumask_subset(cs_mask, possible_mask))
+		do_set_cpus_allowed(tsk, cs_mask);