As housekeeping cpumasks can now be modified at run time, we need a way to examine the their current values to see if they meet our expectation. Add a new sched debugfs file "housekeeping_cpumasks" to dump out the current values.
Signed-off-by: Waiman Long <[email protected]> --- kernel/sched/debug.c | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c index 3f06ab84d53f..ba8f0334c15e 100644 --- a/kernel/sched/debug.c +++ b/kernel/sched/debug.c @@ -490,6 +490,35 @@ static void debugfs_fair_server_init(void) } } +#ifdef CONFIG_CPU_ISOLATION +static int hk_cpumasks_show(struct seq_file *m, void *v) +{ + static const char * const hk_type_name[HK_TYPE_MAX] = { + [HK_TYPE_DOMAIN] = "domain", + [HK_TYPE_MANAGED_IRQ] = "managed_irq", + [HK_TYPE_KERNEL_NOISE] = "nohz_full" + }; + int type; + + for (type = 0; type < HK_TYPE_MAX; type++) + seq_printf(m, "%s: %*pbl\n", hk_type_name[type], + cpumask_pr_args(housekeeping_cpumask(type))); + return 0; +} + +static int hk_cpumasks_open(struct inode *inode, struct file *filp) +{ + return single_open(filp, hk_cpumasks_show, NULL); +} + +static const struct file_operations hk_cpumasks_fops = { + .open = hk_cpumasks_open, + .read = seq_read, + .llseek = seq_lseek, + .release = seq_release, +}; +#endif + static __init int sched_init_debug(void) { struct dentry __maybe_unused *numa; @@ -525,6 +554,9 @@ static __init int sched_init_debug(void) debugfs_create_u32("hot_threshold_ms", 0644, numa, &sysctl_numa_balancing_hot_threshold); #endif /* CONFIG_NUMA_BALANCING */ +#ifdef CONFIG_CPU_ISOLATION + debugfs_create_file("housekeeing_cpumasks", 0444, debugfs_sched, NULL, &hk_cpumasks_fops); +#endif debugfs_create_file("debug", 0444, debugfs_sched, NULL, &sched_debug_fops); debugfs_fair_server_init(); -- 2.50.0
