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Commit 06ecb27c authored by Paul Menage's avatar Paul Menage Committed by Linus Torvalds
Browse files

CGroups _s64 files: use read_s64/write_s64 in CFS cgroup for rt_runtime file 



This removes some filesystem boilerplate from the CFS cgroup subsystem.

Signed-off-by: default avatarPaul Menage <menage@google.com>
Acked-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent e73d2c61

kernel/sched.c

+6 −40
Original line number Diff line number Diff line
@@ -9073,48 +9073,14 @@ static u64 cpu_shares_read_u64(struct cgroup *cgrp, struct cftype *cft) 


#ifdef CONFIG_RT_GROUP_SCHED

static ssize_t cpu_rt_runtime_write(struct cgroup *cgrp, struct cftype *cft,

				struct file *file,

				const char __user *userbuf,

				size_t nbytes, loff_t *unused_ppos)

				s64 val)

{

	char buffer[64];

	int retval = 0;

	s64 val;

	char *end;



	if (!nbytes)

		return -EINVAL;

	if (nbytes >= sizeof(buffer))

		return -E2BIG;

	if (copy_from_user(buffer, userbuf, nbytes))

		return -EFAULT;



	buffer[nbytes] = 0;     /* nul-terminate */



	/* strip newline if necessary */

	if (nbytes && (buffer[nbytes-1] == '\n'))

		buffer[nbytes-1] = 0;

	val = simple_strtoll(buffer, &end, 0);

	if (*end)

		return -EINVAL;



	/* Pass to subsystem */

	retval = sched_group_set_rt_runtime(cgroup_tg(cgrp), val);

	if (!retval)

		retval = nbytes;

	return retval;

	return sched_group_set_rt_runtime(cgroup_tg(cgrp), val);

}



static ssize_t cpu_rt_runtime_read(struct cgroup *cgrp, struct cftype *cft,

				   struct file *file,

				   char __user *buf, size_t nbytes,

				   loff_t *ppos)

static s64 cpu_rt_runtime_read(struct cgroup *cgrp, struct cftype *cft)

{

	char tmp[64];

	long val = sched_group_rt_runtime(cgroup_tg(cgrp));

	int len = sprintf(tmp, "%ld\n", val);



	return simple_read_from_buffer(buf, nbytes, ppos, tmp, len);

	return sched_group_rt_runtime(cgroup_tg(cgrp));

}



static int cpu_rt_period_write_uint(struct cgroup *cgrp, struct cftype *cftype,
@@ -9140,8 +9106,8 @@ static struct cftype cpu_files[] = { 
#ifdef CONFIG_RT_GROUP_SCHED

	{

		.name = "rt_runtime_us",

		.read = cpu_rt_runtime_read,

		.write = cpu_rt_runtime_write,

		.read_s64 = cpu_rt_runtime_read,

		.write_s64 = cpu_rt_runtime_write,

	},

	{

		.name = "rt_period_us",