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Commit 30fd049a authored by Rakib Mullick's avatar Rakib Mullick Committed by Ingo Molnar
Browse files

sched: Remove sched_switch 



Currently we don't utilize the sched_switch field anymore.

But, simply removing sched_switch field from the middle of the
sched_stat output will break tools.

So, to stay compatible we hardcode it to zero and remove the
field from the scheduler data structures.

Update the schedstat documentation accordingly.

Signed-off-by: default avatarRakib Mullick <rakib.mullick@gmail.com>
Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1327422836.27181.5.camel@localhost.localdomain


Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 4ec4412e

Documentation/scheduler/sched-stats.txt

+2 −1
Original line number Original line Diff line number Diff line
@@ -38,7 +38,8 @@ First field is a sched_yield() statistic: 
     1) # of times sched_yield() was called

     1) # of times sched_yield() was called





Next three are schedule() statistics:

Next three are schedule() statistics:

     2) # of times we switched to the expired queue and reused it

     2) This field is a legacy array expiration count field used in the O(1)

	scheduler. We kept it for ABI compatibility, but it is always set to zero.

     3) # of times schedule() was called

     3) # of times schedule() was called

     4) # of times schedule() left the processor idle

     4) # of times schedule() left the processor idle

kernel/sched/debug.c

+0 −1
Original line number Original line Diff line number Diff line
@@ -288,7 +288,6 @@ static void print_cpu(struct seq_file *m, int cpu) 




	P(yld_count);

	P(yld_count);





	P(sched_switch);

	P(sched_count);

	P(sched_count);

	P(sched_goidle);

	P(sched_goidle);

#ifdef CONFIG_SMP

#ifdef CONFIG_SMP

kernel/sched/sched.h

+0 −1
Original line number Original line Diff line number Diff line
@@ -462,7 +462,6 @@ struct rq { 
	unsigned int yld_count;

	unsigned int yld_count;





	/* schedule() stats */

	/* schedule() stats */

	unsigned int sched_switch;

	unsigned int sched_count;

	unsigned int sched_count;

	unsigned int sched_goidle;

	unsigned int sched_goidle;

kernel/sched/stats.c

+2 −2
Original line number Original line Diff line number Diff line
@@ -32,9 +32,9 @@ static int show_schedstat(struct seq_file *seq, void *v) 




		/* runqueue-specific stats */

		/* runqueue-specific stats */

		seq_printf(seq,

		seq_printf(seq,

		    "cpu%d %u %u %u %u %u %u %llu %llu %lu",

		    "cpu%d %u 0 %u %u %u %u %llu %llu %lu",

		    cpu, rq->yld_count,

		    cpu, rq->yld_count,

		    rq->sched_switch, rq->sched_count, rq->sched_goidle,

		    rq->sched_count, rq->sched_goidle,

		    rq->ttwu_count, rq->ttwu_local,

		    rq->ttwu_count, rq->ttwu_local,

		    rq->rq_cpu_time,

		    rq->rq_cpu_time,

		    rq->rq_sched_info.run_delay, rq->rq_sched_info.pcount);

		    rq->rq_sched_info.run_delay, rq->rq_sched_info.pcount);