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cgroup: fix display of forceidle time at root

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We need to reset forceidle_sum to 0 when reading from root, since the
bstat we accumulate into is stack allocated.

To make this more robust, just replace the existing cputime reset with a
memset of the overall bstat.

Signed-off-by: Josh Don <joshdon@google.com>
Fixes: 1fcf54deb7 ("sched/core: add forced idle accounting for cgroups")
Cc: stable@vger.kernel.org # v6.0+
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Josh Don 2023-03-15 14:40:29 -07:00 committed by Tejun Heo
parent 8d3c682a5e
commit fcdb1eda53
1 changed files with 1 additions and 3 deletions
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4
kernel/cgroup/rstat.c
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@ -457,9 +457,7 @@ static void root_cgroup_cputime(struct cgroup_base_stat *bstat)
struct task_cputime *cputime = &bstat->cputime;
int i;
cputime->stime = 0;
cputime->utime = 0;
cputime->sum_exec_runtime = 0;
memset(bstat, 0, sizeof(*bstat));
for_each_possible_cpu(i) {
struct kernel_cpustat kcpustat;
u64 *cpustat = kcpustat.cpustat;