[PATCH v10 9/9] cpuset: Allow reporting of sched domain generation info
From: Waiman Long <longman@redhat.com>
Date: 2018-06-18 04:15:40
Also in:
cgroups, lkml
Subsystem:
control group (cgroup), control group - cpuset, the rest · Maintainers:
Tejun Heo, Johannes Weiner, Michal Koutný, Waiman Long, Linus Torvalds
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@redhat.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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