sched: add CFS debug sysctls

add CFS debug sysctls: only tweakable if SCHED_DEBUG is enabled.
This allows for faster debugging of scheduler problems.

Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 30ee462ee79f8646eace494e5244ddaace7f5d95..51f5dac42a00c9f56943a44b7d1865f604d84bde 100644 (file)
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -206,7 +206,87 @@ static ctl_table root_table[] = {
        { .ctl_name = 0 }
 };
 
+#ifdef CONFIG_SCHED_DEBUG
+static unsigned long min_sched_granularity_ns = 100000;                /* 100 usecs */
+static unsigned long max_sched_granularity_ns = 1000000000;    /* 1 second */
+static unsigned long min_wakeup_granularity_ns;                        /* 0 usecs */
+static unsigned long max_wakeup_granularity_ns = 1000000000;   /* 1 second */
+#endif
+
 static ctl_table kern_table[] = {
+#ifdef CONFIG_SCHED_DEBUG
+       {
+               .ctl_name       = CTL_UNNUMBERED,
+               .procname       = "sched_granularity_ns",
+               .data           = &sysctl_sched_granularity,
+               .maxlen         = sizeof(unsigned int),
+               .mode           = 0644,
+               .proc_handler   = &proc_dointvec_minmax,
+               .strategy       = &sysctl_intvec,
+               .extra1         = &min_sched_granularity_ns,
+               .extra2         = &max_sched_granularity_ns,
+       },
+       {
+               .ctl_name       = CTL_UNNUMBERED,
+               .procname       = "sched_wakeup_granularity_ns",
+               .data           = &sysctl_sched_wakeup_granularity,
+               .maxlen         = sizeof(unsigned int),
+               .mode           = 0644,
+               .proc_handler   = &proc_dointvec_minmax,
+               .strategy       = &sysctl_intvec,
+               .extra1         = &min_wakeup_granularity_ns,
+               .extra2         = &max_wakeup_granularity_ns,
+       },
+       {
+               .ctl_name       = CTL_UNNUMBERED,
+               .procname       = "sched_batch_wakeup_granularity_ns",
+               .data           = &sysctl_sched_batch_wakeup_granularity,
+               .maxlen         = sizeof(unsigned int),
+               .mode           = 0644,
+               .proc_handler   = &proc_dointvec_minmax,
+               .strategy       = &sysctl_intvec,
+               .extra1         = &min_wakeup_granularity_ns,
+               .extra2         = &max_wakeup_granularity_ns,
+       },
+       {
+               .ctl_name       = CTL_UNNUMBERED,
+               .procname       = "sched_stat_granularity_ns",
+               .data           = &sysctl_sched_stat_granularity,
+               .maxlen         = sizeof(unsigned int),
+               .mode           = 0644,
+               .proc_handler   = &proc_dointvec_minmax,
+               .strategy       = &sysctl_intvec,
+               .extra1         = &min_wakeup_granularity_ns,
+               .extra2         = &max_wakeup_granularity_ns,
+       },
+       {
+               .ctl_name       = CTL_UNNUMBERED,
+               .procname       = "sched_runtime_limit_ns",
+               .data           = &sysctl_sched_runtime_limit,
+               .maxlen         = sizeof(unsigned int),
+               .mode           = 0644,
+               .proc_handler   = &proc_dointvec_minmax,
+               .strategy       = &sysctl_intvec,
+               .extra1         = &min_sched_granularity_ns,
+               .extra2         = &max_sched_granularity_ns,
+       },
+       {
+               .ctl_name       = CTL_UNNUMBERED,
+               .procname       = "sched_child_runs_first",
+               .data           = &sysctl_sched_child_runs_first,
+               .maxlen         = sizeof(unsigned int),
+               .mode           = 0644,
+               .proc_handler   = &proc_dointvec,
+       },
+       {
+               .ctl_name       = CTL_UNNUMBERED,
+               .procname       = "sched_features",
+               .data           = &sysctl_sched_features,
+               .maxlen         = sizeof(unsigned int),
+               .mode           = 0644,
+               .proc_handler   = &proc_dointvec,
+       },
+#endif
        {
                .ctl_name       = KERN_PANIC,
                .procname       = "panic",