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CGroups _s64 files: add cgroups read_s64/write_s64 file methods

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These patches add cgroups read_s64 and write_s64 control file methods (the
signed equivalent of read_u64/write_u64) and use them to implement the
cpu.rt_runtime_us control file in the CFS cgroup subsystem.

This patch:

These are the signed equivalents of the read_u64/write_u64 methods

Signed-off-by: Paul Menage <menage@google.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Paul Menage
2008-04-29 01:00:06 -07:00
committed by Linus Torvalds
parent 418d7d875c
commit e73d2c61d1
2 changed files with 36 additions and 10 deletions
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8
include/linux/cgroup.h
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@@ -215,6 +215,10 @@ struct cftype {
* single integer. Use it in place of read()
*/
u64 (*read_u64) (struct cgroup *cgrp, struct cftype *cft);
/*
* read_s64() is a signed version of read_u64()
*/
s64 (*read_s64) (struct cgroup *cgrp, struct cftype *cft);
/*
* read_map() is used for defining a map of key/value
* pairs. It should call cb->fill(cb, key, value) for each
@@ -234,6 +238,10 @@ struct cftype {
* userspace. Use in place of write(); return 0 or error.
*/
int (*write_u64) (struct cgroup *cgrp, struct cftype *cft, u64 val);
/*
* write_s64() is a signed version of write_u64()
*/
int (*write_s64) (struct cgroup *cgrp, struct cftype *cft, s64 val);
int (*release) (struct inode *inode, struct file *file);
};