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authorMichael Holzheu <holzheu@linux.vnet.ibm.com>2010-10-27 15:34:44 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-10-27 18:03:17 -0700
commit3d9e0cf1fe007b88db55d43dfdb6839e1a029ca5 (patch)
tree508a9c06b48d5a232d669c6f95b4d3e8e4c2950c /kernel
parent9323312592cca636d7c2580dc85fa4846efa86a2 (diff)
taskstats: split fill_pid function
Separate the finding of a task_struct by pid or tgid from filling the taskstats data. This makes the code more readable. Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com> Acked-by: Balbir Singh <balbir@linux.vnet.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/taskstats.c50
1 files changed, 21 insertions, 29 deletions
diff --git a/kernel/taskstats.c b/kernel/taskstats.c
index 9970cae04f15..c8231fb15708 100644
--- a/kernel/taskstats.c
+++ b/kernel/taskstats.c
@@ -175,22 +175,8 @@ static void send_cpu_listeners(struct sk_buff *skb,
up_write(&listeners->sem);
}
-static int fill_pid(pid_t pid, struct task_struct *tsk,
- struct taskstats *stats)
+static void fill_stats(struct task_struct *tsk, struct taskstats *stats)
{
- int rc = 0;
-
- if (!tsk) {
- rcu_read_lock();
- tsk = find_task_by_vpid(pid);
- if (tsk)
- get_task_struct(tsk);
- rcu_read_unlock();
- if (!tsk)
- return -ESRCH;
- } else
- get_task_struct(tsk);
-
memset(stats, 0, sizeof(*stats));
/*
* Each accounting subsystem adds calls to its functions to
@@ -209,17 +195,27 @@ static int fill_pid(pid_t pid, struct task_struct *tsk,
/* fill in extended acct fields */
xacct_add_tsk(stats, tsk);
+}
- /* Define err: label here if needed */
- put_task_struct(tsk);
- return rc;
+static int fill_stats_for_pid(pid_t pid, struct taskstats *stats)
+{
+ struct task_struct *tsk;
+ rcu_read_lock();
+ tsk = find_task_by_vpid(pid);
+ if (tsk)
+ get_task_struct(tsk);
+ rcu_read_unlock();
+ if (!tsk)
+ return -ESRCH;
+ fill_stats(tsk, stats);
+ put_task_struct(tsk);
+ return 0;
}
-static int fill_tgid(pid_t tgid, struct task_struct *first,
- struct taskstats *stats)
+static int fill_stats_for_tgid(pid_t tgid, struct taskstats *stats)
{
- struct task_struct *tsk;
+ struct task_struct *tsk, *first;
unsigned long flags;
int rc = -ESRCH;
@@ -228,8 +224,7 @@ static int fill_tgid(pid_t tgid, struct task_struct *first,
* leaders who are already counted with the dead tasks
*/
rcu_read_lock();
- if (!first)
- first = find_task_by_vpid(tgid);
+ first = find_task_by_vpid(tgid);
if (!first || !lock_task_sighand(first, &flags))
goto out;
@@ -268,7 +263,6 @@ out:
return rc;
}
-
static void fill_tgid_exit(struct task_struct *tsk)
{
unsigned long flags;
@@ -483,7 +477,7 @@ static int cmd_attr_pid(struct genl_info *info)
if (!stats)
goto err;
- rc = fill_pid(pid, NULL, stats);
+ rc = fill_stats_for_pid(pid, stats);
if (rc < 0)
goto err;
return send_reply(rep_skb, info);
@@ -513,7 +507,7 @@ static int cmd_attr_tgid(struct genl_info *info)
if (!stats)
goto err;
- rc = fill_tgid(tgid, NULL, stats);
+ rc = fill_stats_for_tgid(tgid, stats);
if (rc < 0)
goto err;
return send_reply(rep_skb, info);
@@ -599,9 +593,7 @@ void taskstats_exit(struct task_struct *tsk, int group_dead)
if (!stats)
goto err;
- rc = fill_pid(-1, tsk, stats);
- if (rc < 0)
- goto err;
+ fill_stats(tsk, stats);
/*
* Doesn't matter if tsk is the leader or the last group member leaving

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