e5ae880384
It was found that the check to see if a partition could use up all
the cpus from the parent cpuset in update_parent_subparts_cpumask()
was incorrect. As a result, it is possible to leave parent with no
effective cpu left even if there are tasks in the parent cpuset. This
can lead to system panic as reported in [1].
Fix this probem by updating the check to fail the enabling the partition
if parent's effective_cpus is a subset of the child's cpus_allowed.
Also record the error code when an error happens in update_prstate()
and add a test case where parent partition and child have the same cpu
list and parent has task. Enabling partition in the child will fail in
this case.
[1] https://www.spinics.net/lists/cgroups/msg36254.html
Fixes:
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|---|---|---|
| .. | ||
| .gitignore | ||
| Makefile | ||
| cgroup_util.c | ||
| cgroup_util.h | ||
| config | ||
| memcg_protection.m | ||
| test_core.c | ||
| test_cpu.c | ||
| test_cpuset_prs.sh | ||
| test_freezer.c | ||
| test_kill.c | ||
| test_kmem.c | ||
| test_memcontrol.c | ||
| test_stress.sh | ||
| wait_inotify.c | ||
| with_stress.sh | ||