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Date: Thu, 1 Aug 2013 17:49:56 -0400
From: Tejun Heo <tj@...nel.org>
To: lizefan@...wei.com
Cc: containers@...ts.linux-foundation.org, cgroups@...r.kernel.org,
linux-kernel@...r.kernel.org, Tejun Heo <tj@...nel.org>,
Matt Helsley <matthltc@...ibm.com>,
Johannes Weiner <hannes@...xchg.org>,
Michal Hocko <mhocko@...e.cz>,
Balbir Singh <bsingharora@...il.com>
Subject: [PATCH 18/23] cgroup: make cgroup_task_iter remember the cgroup being iterated
Currently all cgroup_task_iter functions require @cgrp to be passed
in, which is superflous and increases chance of usage error. Make
cgroup_task_iter remember the cgroup being iterated and drop @cgrp
argument from next and end functions.
This patch doesn't introduce any behavior differences.
Signed-off-by: Tejun Heo <tj@...nel.org>
Cc: Matt Helsley <matthltc@...ibm.com>
Cc: Johannes Weiner <hannes@...xchg.org>
Cc: Michal Hocko <mhocko@...e.cz>
Cc: Balbir Singh <bsingharora@...il.com>
---
include/linux/cgroup.h | 6 +++---
kernel/cgroup.c | 32 +++++++++++++++-----------------
kernel/cgroup_freezer.c | 12 ++++++------
mm/memcontrol.c | 6 +++---
4 files changed, 27 insertions(+), 29 deletions(-)
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index 4478336..2b10152 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -892,14 +892,14 @@ css_next_descendant_post(struct cgroup_subsys_state *pos,
/* A cgroup_task_iter should be treated as an opaque object */
struct cgroup_task_iter {
+ struct cgroup *origin_cgrp;
struct list_head *cset_link;
struct list_head *task;
};
void cgroup_task_iter_start(struct cgroup *cgrp, struct cgroup_task_iter *it);
-struct task_struct *cgroup_task_iter_next(struct cgroup *cgrp,
- struct cgroup_task_iter *it);
-void cgroup_task_iter_end(struct cgroup *cgrp, struct cgroup_task_iter *it);
+struct task_struct *cgroup_task_iter_next(struct cgroup_task_iter *it);
+void cgroup_task_iter_end(struct cgroup_task_iter *it);
int cgroup_scan_tasks(struct cgroup_scanner *scan);
int cgroup_attach_task_all(struct task_struct *from, struct task_struct *);
int cgroup_transfer_tasks(struct cgroup *to, struct cgroup *from);
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 7a4f89b..7adaaa6 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -3198,13 +3198,11 @@ EXPORT_SYMBOL_GPL(css_next_descendant_post);
/**
* cgroup_advance_task_iter - advance a task itererator to the next css_set
- * @cgrp: the cgroup to walk tasks of
* @it: the iterator to advance
*
* Advance @it to the next css_set to walk.
*/
-static void cgroup_advance_task_iter(struct cgroup *cgrp,
- struct cgroup_task_iter *it)
+static void cgroup_advance_task_iter(struct cgroup_task_iter *it)
{
struct list_head *l = it->cset_link;
struct cgrp_cset_link *link;
@@ -3213,7 +3211,7 @@ static void cgroup_advance_task_iter(struct cgroup *cgrp,
/* Advance to the next non-empty css_set */
do {
l = l->next;
- if (l == &cgrp->cset_links) {
+ if (l == &it->origin_cgrp->cset_links) {
it->cset_link = NULL;
return;
}
@@ -3250,21 +3248,22 @@ void cgroup_task_iter_start(struct cgroup *cgrp, struct cgroup_task_iter *it)
cgroup_enable_task_cg_lists();
read_lock(&css_set_lock);
+
+ it->origin_cgrp = cgrp;
it->cset_link = &cgrp->cset_links;
- cgroup_advance_task_iter(cgrp, it);
+
+ cgroup_advance_task_iter(it);
}
/**
* cgroup_task_iter_next - return the next task for the iterator
- * @cgrp: the cgroup to walk tasks of
* @it: the task iterator being iterated
*
* The "next" function for task iteration. @it should have been
* initialized via cgroup_task_iter_start(). Returns NULL when the
* iteration reaches the end.
*/
-struct task_struct *cgroup_task_iter_next(struct cgroup *cgrp,
- struct cgroup_task_iter *it)
+struct task_struct *cgroup_task_iter_next(struct cgroup_task_iter *it)
{
struct task_struct *res;
struct list_head *l = it->task;
@@ -3282,7 +3281,7 @@ struct task_struct *cgroup_task_iter_next(struct cgroup *cgrp,
* We reached the end of this task list - move on to the
* next cgrp_cset_link.
*/
- cgroup_advance_task_iter(cgrp, it);
+ cgroup_advance_task_iter(it);
} else {
it->task = l;
}
@@ -3291,12 +3290,11 @@ struct task_struct *cgroup_task_iter_next(struct cgroup *cgrp,
/**
* cgroup_task_iter_end - finish task iteration
- * @cgrp: the cgroup to walk tasks of
* @it: the task iterator to finish
*
* Finish task iteration started by cgroup_task_iter_start().
*/
-void cgroup_task_iter_end(struct cgroup *cgrp, struct cgroup_task_iter *it)
+void cgroup_task_iter_end(struct cgroup_task_iter *it)
__releases(css_set_lock)
{
read_unlock(&css_set_lock);
@@ -3402,7 +3400,7 @@ int cgroup_scan_tasks(struct cgroup_scanner *scan)
*/
heap->size = 0;
cgroup_task_iter_start(scan->cgrp, &it);
- while ((p = cgroup_task_iter_next(scan->cgrp, &it))) {
+ while ((p = cgroup_task_iter_next(&it))) {
/*
* Only affect tasks that qualify per the caller's callback,
* if he provided one
@@ -3435,7 +3433,7 @@ int cgroup_scan_tasks(struct cgroup_scanner *scan)
* the heap and wasn't inserted
*/
}
- cgroup_task_iter_end(scan->cgrp, &it);
+ cgroup_task_iter_end(&it);
if (heap->size) {
for (i = 0; i < heap->size; i++) {
@@ -3657,7 +3655,7 @@ static int pidlist_array_load(struct cgroup *cgrp, enum cgroup_filetype type,
return -ENOMEM;
/* now, populate the array */
cgroup_task_iter_start(cgrp, &it);
- while ((tsk = cgroup_task_iter_next(cgrp, &it))) {
+ while ((tsk = cgroup_task_iter_next(&it))) {
if (unlikely(n == length))
break;
/* get tgid or pid for procs or tasks file respectively */
@@ -3668,7 +3666,7 @@ static int pidlist_array_load(struct cgroup *cgrp, enum cgroup_filetype type,
if (pid > 0) /* make sure to only use valid results */
array[n++] = pid;
}
- cgroup_task_iter_end(cgrp, &it);
+ cgroup_task_iter_end(&it);
length = n;
/* now sort & (if procs) strip out duplicates */
sort(array, length, sizeof(pid_t), cmppid, NULL);
@@ -3717,7 +3715,7 @@ int cgroupstats_build(struct cgroupstats *stats, struct dentry *dentry)
cgrp = dentry->d_fsdata;
cgroup_task_iter_start(cgrp, &it);
- while ((tsk = cgroup_task_iter_next(cgrp, &it))) {
+ while ((tsk = cgroup_task_iter_next(&it))) {
switch (tsk->state) {
case TASK_RUNNING:
stats->nr_running++;
@@ -3737,7 +3735,7 @@ int cgroupstats_build(struct cgroupstats *stats, struct dentry *dentry)
break;
}
}
- cgroup_task_iter_end(cgrp, &it);
+ cgroup_task_iter_end(&it);
err:
return ret;
diff --git a/kernel/cgroup_freezer.c b/kernel/cgroup_freezer.c
index c9177f8..e0ab9bf 100644
--- a/kernel/cgroup_freezer.c
+++ b/kernel/cgroup_freezer.c
@@ -281,7 +281,7 @@ static void update_if_frozen(struct cgroup_subsys_state *css)
/* are all tasks frozen? */
cgroup_task_iter_start(css->cgroup, &it);
- while ((task = cgroup_task_iter_next(css->cgroup, &it))) {
+ while ((task = cgroup_task_iter_next(&it))) {
if (freezing(task)) {
/*
* freezer_should_skip() indicates that the task
@@ -296,7 +296,7 @@ static void update_if_frozen(struct cgroup_subsys_state *css)
freezer->state |= CGROUP_FROZEN;
out_iter_end:
- cgroup_task_iter_end(css->cgroup, &it);
+ cgroup_task_iter_end(&it);
out_unlock:
spin_unlock_irq(&freezer->lock);
}
@@ -327,9 +327,9 @@ static void freeze_cgroup(struct freezer *freezer)
struct task_struct *task;
cgroup_task_iter_start(cgroup, &it);
- while ((task = cgroup_task_iter_next(cgroup, &it)))
+ while ((task = cgroup_task_iter_next(&it)))
freeze_task(task);
- cgroup_task_iter_end(cgroup, &it);
+ cgroup_task_iter_end(&it);
}
static void unfreeze_cgroup(struct freezer *freezer)
@@ -339,9 +339,9 @@ static void unfreeze_cgroup(struct freezer *freezer)
struct task_struct *task;
cgroup_task_iter_start(cgroup, &it);
- while ((task = cgroup_task_iter_next(cgroup, &it)))
+ while ((task = cgroup_task_iter_next(&it)))
__thaw_task(task);
- cgroup_task_iter_end(cgroup, &it);
+ cgroup_task_iter_end(&it);
}
/**
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 00b055d..5a5f4dc 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1804,7 +1804,7 @@ static void mem_cgroup_out_of_memory(struct mem_cgroup *memcg, gfp_t gfp_mask,
struct task_struct *task;
cgroup_task_iter_start(cgroup, &it);
- while ((task = cgroup_task_iter_next(cgroup, &it))) {
+ while ((task = cgroup_task_iter_next(&it))) {
switch (oom_scan_process_thread(task, totalpages, NULL,
false)) {
case OOM_SCAN_SELECT:
@@ -1817,7 +1817,7 @@ static void mem_cgroup_out_of_memory(struct mem_cgroup *memcg, gfp_t gfp_mask,
case OOM_SCAN_CONTINUE:
continue;
case OOM_SCAN_ABORT:
- cgroup_task_iter_end(cgroup, &it);
+ cgroup_task_iter_end(&it);
mem_cgroup_iter_break(memcg, iter);
if (chosen)
put_task_struct(chosen);
@@ -1834,7 +1834,7 @@ static void mem_cgroup_out_of_memory(struct mem_cgroup *memcg, gfp_t gfp_mask,
get_task_struct(chosen);
}
}
- cgroup_task_iter_end(cgroup, &it);
+ cgroup_task_iter_end(&it);
}
if (!chosen)
--
1.8.3.1
--
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