Add an empty bpf_rstat_flush() hook that is called during rstat
flushing. bpf programs that make use of rstat and want to flush their
stats can attach to bpf_rstat_flush().
Signed-off-by: Yosry Ahmed <yosryahmed@xxxxxxxxxx>
---
kernel/cgroup/rstat.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/kernel/cgroup/rstat.c b/kernel/cgroup/rstat.c
index 24b5c2ab5598..e7a88d2600bd 100644
--- a/kernel/cgroup/rstat.c
+++ b/kernel/cgroup/rstat.c
@@ -141,6 +141,12 @@ static struct cgroup *cgroup_rstat_cpu_pop_updated(struct cgroup *pos,
return pos;
}
+/* A hook for bpf stat collectors to attach to and flush their stats */
+__weak noinline void bpf_rstat_flush(struct cgroup *cgrp,
+ struct cgroup *parent, int cpu)
+{
+}
+
/* see cgroup_rstat_flush() */
static void cgroup_rstat_flush_locked(struct cgroup *cgrp, bool may_sleep)
__releases(&cgroup_rstat_lock) __acquires(&cgroup_rstat_lock)
@@ -168,6 +174,7 @@ static void cgroup_rstat_flush_locked(struct cgroup *cgrp, bool may_sleep)
struct cgroup_subsys_state *css;
cgroup_base_stat_flush(pos, cpu);
+ bpf_rstat_flush(pos, cgroup_parent(pos), cpu);
rcu_read_lock();
list_for_each_entry_rcu(css, &pos->rstat_css_list,
--
2.36.1.124.g0e6072fb45-goog
