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    Subject[PATCH v11 9/9] cpuset: Allow reporting of sched domain generation info
    Date
    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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