f7c2472acb
PSI accounts stalls for each cgroup separately and aggregates it at each level of the hierarchy. This causes additional overhead with psi_avgs_work being called for each cgroup in the hierarchy. psi_avgs_work has been highly optimized, however on systems with large number of cgroups the overhead becomes noticeable. Systems which use PSI only at the system level could avoid this overhead if PSI can be configured to skip per-cgroup stall accounting. Add "cgroup_disable=pressure" kernel command-line option to allow requesting system-wide only pressure stall accounting. When set, it keeps system-wide accounting under /proc/pressure/ but skips accounting for individual cgroups and does not expose PSI nodes in cgroup hierarchy. Signed-off-by: Suren Baghdasaryan <surenb@google.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Signed-off-by: Tejun Heo <tj@kernel.org> Link: https://lore.kernel.org/patchwork/patch/1435705 (cherry picked from commit 3958e2d0c34e18c41b60dc01832bd670a59ef70f https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git tj) Conflicts: include/linux/cgroup-defs.h kernel/cgroup/cgroup.c 1. Trivial merge conflict in cgroup-defs.h due to missing CFTYPE_DEBUG 2. Changed flags to (CFTYPE_NOT_ON_ROOT | CFTYPE_PRESSURE) in cgroup.c because in 4.19 psi files were allowed only in non-root cgroups. Bug: 178872719 Bug: 191734423 Signed-off-by: Suren Baghdasaryan <surenb@google.com> Change-Id: Ifc8fbc52f9a1131d7c2668edbb44c525c76c3360 Git-commit: 92c6dd6a650e1c9161b3e9b37cb7e34b98c32b06 Git-repo: https://android.googlesource.com/kernel/common/ Signed-off-by: Srinivasarao P <spathi@codeaurora.org> |
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| .. | ||
| autogroup.c | ||
| autogroup.h | ||
| boost.c | ||
| clock.c | ||
| completion.c | ||
| core.c | ||
| core_ctl.c | ||
| cpuacct.c | ||
| cpudeadline.c | ||
| cpudeadline.h | ||
| cpufreq.c | ||
| cpufreq_schedutil.c | ||
| cpupri.c | ||
| cpupri.h | ||
| cputime.c | ||
| deadline.c | ||
| debug.c | ||
| fair.c | ||
| features.h | ||
| idle.c | ||
| isolation.c | ||
| loadavg.c | ||
| Makefile | ||
| membarrier.c | ||
| pelt.c | ||
| pelt.h | ||
| psi.c | ||
| rt.c | ||
| sched-pelt.h | ||
| sched.h | ||
| sched_avg.c | ||
| stats.c | ||
| stats.h | ||
| stop_task.c | ||
| swait.c | ||
| topology.c | ||
| tune.c | ||
| tune.h | ||
| wait.c | ||
| wait_bit.c | ||
| walt.c | ||
| walt.h | ||