[Patch v3 6/6] sched/debug: Dump domains' sched group flags

From: Tim Chen <tim.c.chen@linux.intel.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Juri Lelli <juri.lelli@redhat.com>,
	Vincent Guittot <vincent.guittot@linaro.org>,
	Ricardo Neri <ricardo.neri@intel.com>,
	"Ravi V . Shankar" <ravi.v.shankar@intel.com>,
	Ben Segall <bsegall@google.com>,
	Daniel Bristot de Oliveira <bristot@redhat.com>,
	Dietmar Eggemann <dietmar.eggemann@arm.com>,
	Len Brown <len.brown@intel.com>, Mel Gorman <mgorman@suse.de>,
	"Rafael J . Wysocki" <rafael.j.wysocki@intel.com>,
	Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>,
	Steven Rostedt <rostedt@goodmis.org>,
	Tim Chen <tim.c.chen@linux.intel.com>,
	Valentin Schneider <vschneid@redhat.com>,
	Ionela Voinescu <ionela.voinescu@arm.com>,
	x86@kernel.org, linux-kernel@vger.kernel.org,
	Shrikanth Hegde <sshegde@linux.vnet.ibm.com>,
	Srikar Dronamraju <srikar@linux.vnet.ibm.com>,
	naveen.n.rao@linux.vnet.ibm.com,
	Yicong Yang <yangyicong@hisilicon.com>,
	Barry Song <v-songbaohua@oppo.com>, Chen Yu <yu.c.chen@intel.com>,
	Hillf Danton <hdanton@sina.com>
Subject: [Patch v3 6/6] sched/debug: Dump domains' sched group flags
Date: Fri,  7 Jul 2023 15:57:05 -0700	[thread overview]
Message-ID: <ed1749262d94d95a8296c86a415999eda90bcfe3.1688770494.git.tim.c.chen@linux.intel.com> (raw)
In-Reply-To: <cover.1688770494.git.tim.c.chen@linux.intel.com>

From: "Peter Zijlstra (Intel)" <peterz@infradead.org>

There have been a case where the SD_SHARE_CPUCAPACITY sched group flag
in a parent domain were not set and propagated properly when a degenerate
domain is removed.

Add dump of domain sched group flags of a CPU to make debug easier
in the future.

Usage:
cat /debug/sched/domains/cpu0/domain1/groups_flags
to dump cpu0 domain1's sched group flags.

Signed-off-by: Tim Chen <tim.c.chen@linux.intel.com>
---
 kernel/sched/debug.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c
index 1637b65ba07a..55b50f940feb 100644
--- a/kernel/sched/debug.c
+++ b/kernel/sched/debug.c
@@ -389,6 +389,7 @@ static void register_sd(struct sched_domain *sd, struct dentry *parent)
 #undef SDM
 
 	debugfs_create_file("flags", 0444, parent, &sd->flags, &sd_flags_fops);
+	debugfs_create_file("groups_flags", 0444, parent, &sd->groups->flags, &sd_flags_fops);
 }
 
 void update_sched_domain_debugfs(void)
-- 
2.32.0

