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authorOleg Nesterov <oleg@redhat.com>2009-09-23 15:56:46 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-09-24 07:20:59 -0700
commit0b7570e77f7c3abd43107dabc47ea89daf9a1cba (patch)
tree8dd93b4a189b4e98384d4470a289ecfb7818cc26 /kernel/exit.c
parenta2322e1d272938d192d8c24cdacf57c0c7a2683f (diff)
downloadlinux-0b7570e77f7c3abd43107dabc47ea89daf9a1cba.tar.bz2
do_wait() wakeup optimization: change __wake_up_parent() to use filtered wakeup
Ratan Nalumasu reported that in a process with many threads doing unnecessary wakeups. Every waiting thread in the process wakes up to loop through the children and see that the only ones it cares about are still not ready. Now that we have struct wait_opts we can change do_wait/__wake_up_parent to use filtered wakeups. We can make child_wait_callback() more clever later, right now it only checks eligible_child(). Signed-off-by: Oleg Nesterov <oleg@redhat.com> Acked-by: Roland McGrath <roland@redhat.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Ratan Nalumasu <rnalumasu@gmail.com> Cc: Vitaly Mayatskikh <vmayatsk@redhat.com> Acked-by: James Morris <jmorris@namei.org> Tested-by: Valdis Kletnieks <valdis.kletnieks@vt.edu> Acked-by: David Howells <dhowells@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/exit.c')
-rw-r--r--kernel/exit.c25
1 files changed, 21 insertions, 4 deletions
diff --git a/kernel/exit.c b/kernel/exit.c
index ef2dfa818bf1..7838b4d68774 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -1097,6 +1097,7 @@ struct wait_opts {
int __user *wo_stat;
struct rusage __user *wo_rusage;
+ wait_queue_t child_wait;
int notask_error;
};
@@ -1570,20 +1571,35 @@ static int ptrace_do_wait(struct wait_opts *wo, struct task_struct *tsk)
return 0;
}
+static int child_wait_callback(wait_queue_t *wait, unsigned mode,
+ int sync, void *key)
+{
+ struct wait_opts *wo = container_of(wait, struct wait_opts,
+ child_wait);
+ struct task_struct *p = key;
+
+ if (!eligible_child(wo, p))
+ return 0;
+
+ return default_wake_function(wait, mode, sync, key);
+}
+
void __wake_up_parent(struct task_struct *p, struct task_struct *parent)
{
- wake_up_interruptible_sync(&parent->signal->wait_chldexit);
+ __wake_up_sync_key(&parent->signal->wait_chldexit,
+ TASK_INTERRUPTIBLE, 1, p);
}
static long do_wait(struct wait_opts *wo)
{
- DECLARE_WAITQUEUE(wait, current);
struct task_struct *tsk;
int retval;
trace_sched_process_wait(wo->wo_pid);
- add_wait_queue(&current->signal->wait_chldexit,&wait);
+ init_waitqueue_func_entry(&wo->child_wait, child_wait_callback);
+ wo->child_wait.private = current;
+ add_wait_queue(&current->signal->wait_chldexit, &wo->child_wait);
repeat:
/*
* If there is nothing that can match our critiera just get out.
@@ -1624,7 +1640,8 @@ notask:
}
end:
__set_current_state(TASK_RUNNING);
- remove_wait_queue(&current->signal->wait_chldexit,&wait);
+ remove_wait_queue(&current->signal->wait_chldexit, &wo->child_wait);
+
if (wo->wo_info) {
struct siginfo __user *infop = wo->wo_info;