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Commit 5968cece authored by Naveen N. Rao's avatar Naveen N. Rao Committed by Ingo Molnar
Browse files

sched/stat: Expose /proc/pid/schedstat if CONFIG_SCHED_INFO=y 



Expand /proc/pid/schedstat output:

 - enable it on CONFIG_TASK_DELAY_ACCT=y && !CONFIG_SCHEDSTATS kernels.

 - dump all zeroes on kernels that are booted with the 'nodelayacct'
   option, which boot option disables delay accounting on
   CONFIG_TASK_DELAY_ACCT=y kernels.

Signed-off-by: default avatarNaveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Cc: Balbir Singh <bsingharora@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: a.p.zijlstra@chello.nl
Cc: ricklind@us.ibm.com
Link: http://lkml.kernel.org/r/5ccbef17d4bc841084ea6e6421d4e4a23b7b806f.1435654789.git.naveen.n.rao@linux.vnet.ibm.com


Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent f6db8347

fs/proc/base.c

+7 −4
Original line number Diff line number Diff line
@@ -304,13 +304,16 @@ static int proc_pid_stack(struct seq_file *m, struct pid_namespace *ns, 
}

#endif



#ifdef CONFIG_SCHEDSTATS

#ifdef CONFIG_SCHED_INFO

/*

 * Provides /proc/PID/schedstat

 */

static int proc_pid_schedstat(struct seq_file *m, struct pid_namespace *ns,

			      struct pid *pid, struct task_struct *task)

{

	if (unlikely(!sched_info_on()))

		seq_printf(m, "0 0 0\n");

	else

		seq_printf(m, "%llu %llu %lu\n",

		   (unsigned long long)task->se.sum_exec_runtime,

		   (unsigned long long)task->sched_info.run_delay,
@@ -2600,7 +2603,7 @@ static const struct pid_entry tgid_base_stuff[] = { 
#ifdef CONFIG_STACKTRACE

	ONE("stack",      S_IRUSR, proc_pid_stack),

#endif

#ifdef CONFIG_SCHEDSTATS

#ifdef CONFIG_SCHED_INFO

	ONE("schedstat",  S_IRUGO, proc_pid_schedstat),

#endif

#ifdef CONFIG_LATENCYTOP
@@ -2948,7 +2951,7 @@ static const struct pid_entry tid_base_stuff[] = { 
#ifdef CONFIG_STACKTRACE

	ONE("stack",      S_IRUSR, proc_pid_stack),

#endif

#ifdef CONFIG_SCHEDSTATS

#ifdef CONFIG_SCHED_INFO

	ONE("schedstat", S_IRUGO, proc_pid_schedstat),

#endif

#ifdef CONFIG_LATENCYTOP