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Message-Id: <1529295249-5207-11-git-send-email-longman@redhat.com>
Date: Mon, 18 Jun 2018 12:14:09 +0800
From: Waiman Long <longman@...hat.com>
To: Tejun Heo <tj@...nel.org>, Li Zefan <lizefan@...wei.com>,
Johannes Weiner <hannes@...xchg.org>,
Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>
Cc: cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-doc@...r.kernel.org, kernel-team@...com, pjt@...gle.com,
luto@...capital.net, Mike Galbraith <efault@....de>,
torvalds@...ux-foundation.org, Roman Gushchin <guro@...com>,
Juri Lelli <juri.lelli@...hat.com>,
Patrick Bellasi <patrick.bellasi@....com>,
Waiman Long <longman@...hat.com>
Subject: [PATCH v10 9/9] cpuset: Allow reporting of sched domain generation info
This patch enables us to report sched domain generation information.
If DYNAMIC_DEBUG is enabled, issuing the following command
echo "file cpuset.c +p" > /sys/kernel/debug/dynamic_debug/control
and setting loglevel to 8 will allow the kernel to show what scheduling
domain changes are being made.
Signed-off-by: Waiman Long <longman@...hat.com>
---
kernel/cgroup/cpuset.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c
index ed80663..2943d7c 100644
--- a/kernel/cgroup/cpuset.c
+++ b/kernel/cgroup/cpuset.c
@@ -836,6 +836,23 @@ static int generate_sched_domains(cpumask_var_t **domains,
return ndoms;
}
+#ifdef CONFIG_DEBUG_KERNEL
+static inline void debug_print_domains(cpumask_var_t *doms, int ndoms)
+{
+ int i;
+ char buf[200];
+ char *ptr, *end = buf + sizeof(buf) - 1;
+
+ for (i = 0, ptr = buf, *end = '\0'; i < ndoms; i++)
+ ptr += snprintf(ptr, end - ptr, "dom%d=%*pbl ", i,
+ cpumask_pr_args(doms[i]));
+
+ pr_debug("Generated %d domains: %s\n", ndoms, buf);
+}
+#else
+static inline void debug_print_domains(cpumask_var_t *doms, int ndoms) { }
+#endif
+
/*
* Rebuild scheduler domains.
*
@@ -871,6 +888,7 @@ static void rebuild_sched_domains_locked(void)
/* Generate domain masks and attrs */
ndoms = generate_sched_domains(&doms, &attr);
+ debug_print_domains(doms, ndoms);
/* Have scheduler rebuild the domains */
partition_sched_domains(ndoms, doms, attr);
--
1.8.3.1
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