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Commit 44ffc75b authored by Tejun Heo's avatar Tejun Heo
Browse files

cgroup, sched: convert away from cftype->read_map() 



In preparation of conversion to kernfs, cgroup file handling is being
consolidated so that it can be easily mapped to the seq_file based
interface of kernfs.

cftype->read_map() doesn't add any value and being replaced with
->read_seq_string().  Update cpu_stats_show() and cpuacct_stats_show()
accordingly.

This patch doesn't make any visible behavior changes.

Signed-off-by: default avatarTejun Heo <tj@kernel.org>
Acked-by: default avatarLi Zefan <lizefan@huawei.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
parent afb2bc14

kernel/sched/core.c

+5 −5
Original line number Diff line number Diff line
@@ -7257,14 +7257,14 @@ static int __cfs_schedulable(struct task_group *tg, u64 period, u64 quota) 
}



static int cpu_stats_show(struct cgroup_subsys_state *css, struct cftype *cft,

		struct cgroup_map_cb *cb)

			  struct seq_file *sf)

{

	struct task_group *tg = css_tg(css);

	struct cfs_bandwidth *cfs_b = &tg->cfs_bandwidth;



	cb->fill(cb, "nr_periods", cfs_b->nr_periods);

	cb->fill(cb, "nr_throttled", cfs_b->nr_throttled);

	cb->fill(cb, "throttled_time", cfs_b->throttled_time);

	seq_printf(sf, "nr_periods %d\n", cfs_b->nr_periods);

	seq_printf(sf, "nr_throttled %d\n", cfs_b->nr_throttled);

	seq_printf(sf, "throttled_time %llu\n", cfs_b->throttled_time);



	return 0;

}
@@ -7318,7 +7318,7 @@ static struct cftype cpu_files[] = { 
	},

	{

		.name = "stat",

		.read_map = cpu_stats_show,

		.read_seq_string = cpu_stats_show,

	},

#endif

#ifdef CONFIG_RT_GROUP_SCHED

kernel/sched/cpuacct.c

+4 −4
Original line number Diff line number Diff line
@@ -184,7 +184,7 @@ static const char * const cpuacct_stat_desc[] = { 
};



static int cpuacct_stats_show(struct cgroup_subsys_state *css,

			      struct cftype *cft, struct cgroup_map_cb *cb)

			      struct cftype *cft, struct seq_file *sf)

{

	struct cpuacct *ca = css_ca(css);

	int cpu;
@@ -196,7 +196,7 @@ static int cpuacct_stats_show(struct cgroup_subsys_state *css, 
		val += kcpustat->cpustat[CPUTIME_NICE];

	}

	val = cputime64_to_clock_t(val);

	cb->fill(cb, cpuacct_stat_desc[CPUACCT_STAT_USER], val);

	seq_printf(sf, "%s %lld\n", cpuacct_stat_desc[CPUACCT_STAT_USER], val);



	val = 0;

	for_each_online_cpu(cpu) {
@@ -207,7 +207,7 @@ static int cpuacct_stats_show(struct cgroup_subsys_state *css, 
	}



	val = cputime64_to_clock_t(val);

	cb->fill(cb, cpuacct_stat_desc[CPUACCT_STAT_SYSTEM], val);

	seq_printf(sf, "%s %lld\n", cpuacct_stat_desc[CPUACCT_STAT_SYSTEM], val);



	return 0;

}
@@ -224,7 +224,7 @@ static struct cftype files[] = { 
	},

	{

		.name = "stat",

		.read_map = cpuacct_stats_show,

		.read_seq_string = cpuacct_stats_show,

	},

	{ }	/* terminate */

};