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| author | Michael Holzheu <holzheu@linux.vnet.ibm.com> | 2010-10-28 00:34:44 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-10-28 03:03:17 +0200 |
| commit | 3d9e0cf1fe007b88db55d43dfdb6839e1a029ca5 (patch) | |
| tree | 508a9c06b48d5a232d669c6f95b4d3e8e4c2950c /kernel/taskstats.c | |
| parent | taskstats: separate taskstats commands (diff) | |
| download | linux-3d9e0cf1fe007b88db55d43dfdb6839e1a029ca5.tar.xz linux-3d9e0cf1fe007b88db55d43dfdb6839e1a029ca5.zip | |
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/taskstats.c')
| -rw-r--r-- | kernel/taskstats.c | 50 |
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 |