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cgroups: mechanism to process each task in a cgroup

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Provide cgroup_scan_tasks(), which iterates through every task in a cgroup,
calling a test function and a process function for each.  And call the process
function without holding the css_set_lock lock.

The idea is David Rientjes', predicting that such a function will make it much
easier in the future to extend things that require access to each task in a
cgroup without holding the lock,

[akpm@linux-foundation.org: cleanup]
[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Cliff Wickman <cpw@sgi.com>
Cc: Paul Menage <menage@google.com>
Cc: Paul Jackson <pj@sgi.com>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Cliff Wickman 2008-02-07 00:14:42 -08:00 • committed by Linus Torvalds
parent dfc05c259e
commit 31a7df01fd
2 changed files with 200 additions and 12 deletions
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14
include/linux/cgroup.h
View file

@ -14,6 +14,7 @@
#include <linux/nodemask.h>
#include <linux/rcupdate.h>
#include <linux/cgroupstats.h>
#include <linux/prio_heap.h>
#ifdef CONFIG_CGROUPS
@ -207,6 +208,14 @@ struct cftype {
int (*release) (struct inode *inode, struct file *file);
};
struct cgroup_scanner {
struct cgroup *cg;
int (*test_task)(struct task_struct *p, struct cgroup_scanner *scan);
void (*process_task)(struct task_struct *p,
struct cgroup_scanner *scan);
struct ptr_heap *heap;
};
/* Add a new file to the given cgroup directory. Should only be
* called by subsystems from within a populate() method */
int cgroup_add_file(struct cgroup *cont, struct cgroup_subsys *subsys,
@ -299,11 +308,16 @@ struct cgroup_iter {
* returns NULL or until you want to end the iteration
*
* 3) call cgroup_iter_end() to destroy the iterator.
*
* Or, call cgroup_scan_tasks() to iterate through every task in a cpuset.
* - cgroup_scan_tasks() holds the css_set_lock when calling the test_task()
* callback, but not while calling the process_task() callback.
*/
void cgroup_iter_start(struct cgroup *cont, struct cgroup_iter *it);
struct task_struct *cgroup_iter_next(struct cgroup *cont,
struct cgroup_iter *it);
void cgroup_iter_end(struct cgroup *cont, struct cgroup_iter *it);
int cgroup_scan_tasks(struct cgroup_scanner *scan);
#else /* !CONFIG_CGROUPS */