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[PATCH] taskstats: cleanup do_exit() path

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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>
This commit is contained in:
Oleg Nesterov 2006-12-06 20:36:51 -08:00 committed by Linus Torvalds
parent 128fb95650
commit 115085ea07
3 changed files with 19 additions and 47 deletions
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17
include/linux/taskstats_kern.h
View file

@ -15,12 +15,6 @@
extern struct kmem_cache *taskstats_cache;
extern struct mutex taskstats_exit_mutex;
static inline void taskstats_exit_free(struct taskstats *tidstats)
{
if (tidstats)
kmem_cache_free(taskstats_cache, tidstats);
}
static inline void taskstats_tgid_init(struct signal_struct *sig)
{
sig->stats = NULL;
@ -54,17 +48,10 @@ static inline void taskstats_tgid_free(struct signal_struct *sig)
kmem_cache_free(taskstats_cache, sig->stats);
}
extern void taskstats_exit_alloc(struct taskstats **, unsigned int *);
extern void taskstats_exit_send(struct task_struct *, struct taskstats *, int, unsigned int);
extern void taskstats_exit(struct task_struct *, int group_dead);
extern void taskstats_init_early(void);
#else
static inline void taskstats_exit_alloc(struct taskstats **ptidstats, unsigned int *mycpu)
{}
static inline void taskstats_exit_free(struct taskstats *ptidstats)
{}
static inline void taskstats_exit_send(struct task_struct *tsk,
struct taskstats *tidstats,
int group_dead, unsigned int cpu)
static inline void taskstats_exit(struct task_struct *tsk, int group_dead)
{}
static inline void taskstats_tgid_init(struct signal_struct *sig)
{}

8
kernel/exit.c
View file

@ -850,9 +850,7 @@ static void exit_notify(struct task_struct *tsk)
fastcall NORET_TYPE void do_exit(long code)
{
struct task_struct *tsk = current;
struct taskstats *tidstats;
int group_dead;
unsigned int mycpu;
profile_task_exit(tsk);
@ -890,8 +888,6 @@ fastcall NORET_TYPE void do_exit(long code)
current->comm, current->pid,
preempt_count());
taskstats_exit_alloc(&tidstats, &mycpu);
acct_update_integrals(tsk);
if (tsk->mm) {
update_hiwater_rss(tsk->mm);
@ -911,8 +907,8 @@ fastcall NORET_TYPE void do_exit(long code)
#endif
if (unlikely(tsk->audit_context))
audit_free(tsk);
taskstats_exit_send(tsk, tidstats, group_dead, mycpu);
taskstats_exit_free(tidstats);
taskstats_exit(tsk, group_dead);
exit_mm(tsk);

41
kernel/taskstats.c
View file

@ -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 @@ static int taskstats_user_cmd(struct sk_buff *skb, struct genl_info *info)
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 = {