Messages in this thread Patch in this message | | | From | Waiman Long <> | Subject | [PATCH v11 9/9] cpuset: Allow reporting of sched domain generation info | Date | Sun, 24 Jun 2018 15:30:40 +0800 |
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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 07a5575..62b7e61 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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