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authorOleg Nesterov <oleg@tv-sign.ru>2006-12-06 20:36:51 -0800
committerLinus Torvalds <torvalds@woody.osdl.org>2006-12-07 08:39:34 -0800
commit115085ea0794c0f339be8f9d25505c7f9861d824 (patch)
tree0b69f20ab8ab53702a4c94c11927e60fa058b509 /kernel/taskstats.c
parent128fb95650b3273a8dc9ba5514b6fe7db8ea30bf (diff)
downloadlinux-sh-115085ea0794c0f339be8f9d25505c7f9861d824.tar.gz
[PATCH] taskstats: cleanup do_exit() path
do_exit: taskstats_exit_alloc() ... taskstats_exit_send() taskstats_exit_free() I think this is not good, let it be a single function exported to the core kernel, taskstats_exit(), which does alloc + send + free itself. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Cc: Balbir Singh <balbir@in.ibm.com> Cc: Shailabh Nagar <nagar@watson.ibm.com> Cc: Jay Lan <jlan@engr.sgi.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel/taskstats.c')
-rw-r--r--kernel/taskstats.c41
1 files changed, 15 insertions, 26 deletions
diff --git a/kernel/taskstats.c b/kernel/taskstats.c
index d9d7c3576238..2654886fe058 100644
--- a/kernel/taskstats.c
+++ b/kernel/taskstats.c
@@ -119,10 +119,10 @@ static int send_reply(struct sk_buff *skb, pid_t pid)
/*
* Send taskstats data in @skb to listeners registered for @cpu's exit data
*/
-static void send_cpu_listeners(struct sk_buff *skb, unsigned int cpu)
+static void send_cpu_listeners(struct sk_buff *skb,
+ struct listener_list *listeners)
{
struct genlmsghdr *genlhdr = nlmsg_data((struct nlmsghdr *)skb->data);
- struct listener_list *listeners;
struct listener *s, *tmp;
struct sk_buff *skb_next, *skb_cur = skb;
void *reply = genlmsg_data(genlhdr);
@@ -135,7 +135,6 @@ static void send_cpu_listeners(struct sk_buff *skb, unsigned int cpu)
}
rc = 0;
- listeners = &per_cpu(listener_array, cpu);
down_read(&listeners->sem);
list_for_each_entry(s, &listeners->list, list) {
skb_next = NULL;
@@ -413,28 +412,12 @@ err:
return rc;
}
-void taskstats_exit_alloc(struct taskstats **ptidstats, unsigned int *mycpu)
-{
- struct listener_list *listeners;
- /*
- * This is the cpu on which the task is exiting currently and will
- * be the one for which the exit event is sent, even if the cpu
- * on which this function is running changes later.
- */
- *mycpu = raw_smp_processor_id();
-
- listeners = &per_cpu(listener_array, *mycpu);
-
- *ptidstats = NULL;
- if (!list_empty(&listeners->list))
- *ptidstats = kmem_cache_zalloc(taskstats_cache, GFP_KERNEL);
-}
-
/* Send pid data out on exit */
-void taskstats_exit_send(struct task_struct *tsk, struct taskstats *tidstats,
- int group_dead, unsigned int mycpu)
+void taskstats_exit(struct task_struct *tsk, int group_dead)
{
int rc;
+ struct listener_list *listeners;
+ struct taskstats *tidstats;
struct sk_buff *rep_skb;
void *reply;
size_t size;
@@ -458,12 +441,17 @@ void taskstats_exit_send(struct task_struct *tsk, struct taskstats *tidstats,
fill_tgid_exit(tsk);
}
+ listeners = &__raw_get_cpu_var(listener_array);
+ if (list_empty(&listeners->list))
+ return;
+
+ tidstats = kmem_cache_zalloc(taskstats_cache, GFP_KERNEL);
if (!tidstats)
return;
rc = prepare_reply(NULL, TASKSTATS_CMD_NEW, &rep_skb, &reply, size);
if (rc < 0)
- goto ret;
+ goto free_stats;
rc = fill_pid(tsk->pid, tsk, tidstats);
if (rc < 0)
@@ -492,15 +480,16 @@ void taskstats_exit_send(struct task_struct *tsk, struct taskstats *tidstats,
nla_nest_end(rep_skb, na);
send:
- send_cpu_listeners(rep_skb, mycpu);
+ send_cpu_listeners(rep_skb, listeners);
+free_stats:
+ kmem_cache_free(taskstats_cache, tidstats);
return;
nla_put_failure:
genlmsg_cancel(rep_skb, reply);
err_skb:
nlmsg_free(rep_skb);
-ret:
- return;
+ goto free_stats;
}
static struct genl_ops taskstats_ops = {