From df5ba5be7425e1df296d40c5f37a39d98ec666a2 Mon Sep 17 00:00:00 2001
From: Dan Schatzberg <dschatzberg@fb.com>
Date: Tue, 14 May 2019 15:41:18 -0700
Subject: kernel/sched/psi.c: expose pressure metrics on root cgroup

Pressure metrics are already recorded and exposed in procfs for the
entire system, but any tool which monitors cgroup pressure has to
special case the root cgroup to read from procfs.  This patch exposes
the already recorded pressure metrics on the root cgroup.

Link: http://lkml.kernel.org/r/20190510174938.3361741-1-dschatzberg@fb.com
Signed-off-by: Dan Schatzberg <dschatzberg@fb.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: Li Zefan <lizefan@huawei.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 include/linux/psi.h | 1 +
 1 file changed, 1 insertion(+)

(limited to 'include')

diff --git a/include/linux/psi.h b/include/linux/psi.h
index af892c290116..7b3de7321219 100644
--- a/include/linux/psi.h
+++ b/include/linux/psi.h
@@ -12,6 +12,7 @@ struct css_set;
 #ifdef CONFIG_PSI
 
 extern struct static_key_false psi_disabled;
+extern struct psi_group psi_system;
 
 void psi_init(void);
 
-- 
cgit