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| author | Waiman Long <longman@redhat.com> | 2023-12-05 23:21:14 +0100 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2023-12-06 20:37:28 +0100 |
| commit | 3232e7aad11e541da86bbb1fa5ea5737b30bd006 (patch) | |
| tree | 51f9c0bdc14c47b8450051127459d9ba23a47fb5 /kernel/cgroup | |
| parent | cgroup: Avoid false cacheline sharing of read mostly rstat_cpu (diff) | |
| download | linux-3232e7aad11e541da86bbb1fa5ea5737b30bd006.tar.xz linux-3232e7aad11e541da86bbb1fa5ea5737b30bd006.zip | |
cgroup/cpuset: Include isolated cpuset CPUs in cpu_is_isolated() check
Currently, the cpu_is_isolated() function checks only the statically
isolated CPUs specified via the "isolcpus" and "nohz_full" kernel
command line options. This function is used by vmstat and memcg to
reduce interference with isolated CPUs by not doing stat flushing
or scheduling works on those CPUs.
Workloads running on isolated CPUs within isolated cpuset
partitions should receive the same treatment to reduce unnecessary
interference. This patch introduces a new cpuset_cpu_is_isolated()
function to be called by cpu_is_isolated() so that the set of dynamically
created cpuset isolated CPUs will be included in the check.
Assuming that testing a bit in a cpumask is atomic, no synchronization
primitive is currently used to synchronize access to the cpuset's
isolated_cpus mask.
Signed-off-by: Waiman Long <longman@redhat.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'kernel/cgroup')
| -rw-r--r-- | kernel/cgroup/cpuset.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c index 2a16df86c55c..dfbb16aca9f4 100644 --- a/kernel/cgroup/cpuset.c +++ b/kernel/cgroup/cpuset.c @@ -1518,6 +1518,17 @@ static void update_unbound_workqueue_cpumask(bool isolcpus_updated) WARN_ON_ONCE(ret < 0); } +/** + * cpuset_cpu_is_isolated - Check if the given CPU is isolated + * @cpu: the CPU number to be checked + * Return: true if CPU is used in an isolated partition, false otherwise + */ +bool cpuset_cpu_is_isolated(int cpu) +{ + return cpumask_test_cpu(cpu, isolated_cpus); +} +EXPORT_SYMBOL_GPL(cpuset_cpu_is_isolated); + /* * compute_effective_exclusive_cpumask - compute effective exclusive CPUs * @cs: cpuset |