perf: make perf_event cgroup hierarchical

perf_event is one of a couple remaining cgroup controllers with broken
hierarchy support.  Converting it to support hierarchy is almost
trivial.  The only thing necessary is to consider a task belonging to
a descendant cgroup as a match.  IOW, if the cgroup of the currently
executing task (@cpuctx->cgrp) equals or is a descendant of the
event's cgroup (@event->cgrp), then the event should be enabled.

Implement hierarchy support and remove .broken_hierarchy tag along
with the incorrect comment on what needs to be done for hierarchy
support.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Cc: Stephane Eranian <eranian@google.com>
Cc: Namhyung Kim <namhyung.kim@lge.com>

1 files changed, 16 insertions, 8 deletions

diff --git a/kernel/events/core.c b/kernel/events/core.c
index b0cd86501c30..310ec19d968a 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -251,7 +251,22 @@ perf_cgroup_match(struct perf_event *event)
         struct perf_event_context *ctx = event->ctx;
         struct perf_cpu_context *cpuctx = __get_cpu_context(ctx);
 
-        return !event->cgrp || event->cgrp == cpuctx->cgrp;
+        /* @event doesn't care about cgroup */
+        if (!event->cgrp)
+                return true;
+
+        /* wants specific cgroup scope but @cpuctx isn't associated with any */
+        if (!cpuctx->cgrp)
+                return false;
+
+        /*
+         * Cgroup scoping is recursive.  An event enabled for a cgroup is
+         * also enabled for all its descendant cgroups.  If @cpuctx's
+         * cgroup is a descendant of @event's (the test covers identity
+         * case), it's a match.
+         */
+        return cgroup_is_descendant(cpuctx->cgrp->css.cgroup,
+                                    event->cgrp->css.cgroup);
 }
 
 static inline bool perf_tryget_cgroup(struct perf_event *event)
@@ -7509,12 +7524,5 @@ struct cgroup_subsys perf_subsys = {
         .css_free       = perf_cgroup_css_free,
         .exit           = perf_cgroup_exit,
         .attach         = perf_cgroup_attach,
-
-        /*
-         * perf_event cgroup doesn't handle nesting correctly.
-         * ctx->nr_cgroups adjustments should be propagated through the
-         * cgroup hierarchy.  Fix it and remove the following.
-         */
-        .broken_hierarchy = true,
 };
 #endif /* CONFIG_CGROUP_PERF */