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Subject[PATCH v3 23/46] perf/core: hooks to add architecture specific features in perf_cgroup
Date
The hooks allows architectures to extend the behavior of the perf cgroup.

In this patch series, the hooks are used to allow intel_cmt to follow
changes in the perf_cgroup hierarchy.

Signed-off-by: David Carrillo-Cisneros <davidcc@google.com>
---
include/linux/perf_event.h | 11 +++++++++++
kernel/events/core.c | 12 ++++++++++++
2 files changed, 23 insertions(+)

diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 14dff7a..9f388d4 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -1386,4 +1386,15 @@ int perf_event_exit_cpu(unsigned int cpu);
#define perf_event_exit_cpu NULL
#endif

+/*
+ * Hooks for architecture specific extensions for perf_cgroup.
+ */
+#ifndef perf_cgroup_arch_css_online
+# define perf_cgroup_arch_css_online(css) 0
+#endif
+
+#ifndef perf_cgroup_arch_css_offline
+# define perf_cgroup_arch_css_offline(css) do { } while (0)
+#endif
+
#endif /* _LINUX_PERF_EVENT_H */
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 464f46d..e11a16a 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -10748,6 +10748,16 @@ perf_cgroup_css_alloc(struct cgroup_subsys_state *parent_css)
return &jc->css;
}

+static int perf_cgroup_css_online(struct cgroup_subsys_state *css)
+{
+ return perf_cgroup_arch_css_online(css);
+}
+
+static void perf_cgroup_css_offline(struct cgroup_subsys_state *css)
+{
+ perf_cgroup_arch_css_offline(css);
+}
+
static void perf_cgroup_css_free(struct cgroup_subsys_state *css)
{
struct perf_cgroup *jc = container_of(css, struct perf_cgroup, css);
@@ -10776,6 +10786,8 @@ static void perf_cgroup_attach(struct cgroup_taskset *tset)

struct cgroup_subsys perf_event_cgrp_subsys = {
.css_alloc = perf_cgroup_css_alloc,
+ .css_online = perf_cgroup_css_online,
+ .css_offline = perf_cgroup_css_offline,
.css_free = perf_cgroup_css_free,
.attach = perf_cgroup_attach,
};
--
2.8.0.rc3.226.g39d4020
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