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[PATCH -mm v2 2/3] mm/oom_kill: cleanup the "kill sharing same memory" loop

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  [PATCH -mm v2 2/3] mm/oom_kill: cleanup the "kill sharing same  memory" loop Oleg Nesterov <oleg@redhat.com> - 2015-09-30 20:30 +0200
    Re: [PATCH -mm v2 2/3] mm/oom_kill: cleanup the "kill sharing same  memory" loop David Rientjes <rientjes@google.com> - 2015-09-30 23:20 +0200
    Re: [PATCH -mm v2 2/3] mm/oom_kill: cleanup the "kill sharing same  memory" loop Michal Hocko <mhocko@kernel.org> - 2015-10-01 15:00 +0200

#1236624 — [PATCH -mm v2 2/3] mm/oom_kill: cleanup the "kill sharing same memory" loop

Purely cosmetic, but the complex "if" condition looks annoying to me.
Especially because it is not consistent with OOM_SCORE_ADJ_MIN check
which adds another if/continue.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
---
 mm/oom_kill.c | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index b6b8c78..c189ee5 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -583,14 +583,18 @@ void oom_kill_process(struct oom_control *oc, struct task_struct *p,
 	 * pending fatal signal.
 	 */
 	rcu_read_lock();
-	for_each_process(p)
-		if (p->mm == mm && !same_thread_group(p, victim) &&
-		    !(p->flags & PF_KTHREAD)) {
-			if (p->signal->oom_score_adj == OOM_SCORE_ADJ_MIN)
-				continue;
+	for_each_process(p) {
+		if (p->mm != mm)
+			continue;
+		if (same_thread_group(p, victim))
+			continue;
+		if (unlikely(p->flags & PF_KTHREAD))
+			continue;
+		if (p->signal->oom_score_adj == OOM_SCORE_ADJ_MIN)
+			continue;
 
-			do_send_sig_info(SIGKILL, SEND_SIG_FORCED, p, true);
-		}
+		do_send_sig_info(SIGKILL, SEND_SIG_FORCED, p, true);
+	}
 	rcu_read_unlock();
 
 	mmput(mm);
-- 
2.4.3

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#1236768

On Wed, 30 Sep 2015, Oleg Nesterov wrote:

> Purely cosmetic, but the complex "if" condition looks annoying to me.
> Especially because it is not consistent with OOM_SCORE_ADJ_MIN check
> which adds another if/continue.
> 
> Signed-off-by: Oleg Nesterov <oleg@redhat.com>

Acked-by: David Rientjes <rientjes@google.com>
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#1237393

On Wed 30-09-15 20:24:08, Oleg Nesterov wrote:
> Purely cosmetic, but the complex "if" condition looks annoying to me.
> Especially because it is not consistent with OOM_SCORE_ADJ_MIN check
> which adds another if/continue.
> 
> Signed-off-by: Oleg Nesterov <oleg@redhat.com>

Acked-by: Michal Hocko <mhocko@suse.com>

> ---
>  mm/oom_kill.c | 18 +++++++++++-------
>  1 file changed, 11 insertions(+), 7 deletions(-)
> 
> diff --git a/mm/oom_kill.c b/mm/oom_kill.c
> index b6b8c78..c189ee5 100644
> --- a/mm/oom_kill.c
> +++ b/mm/oom_kill.c
> @@ -583,14 +583,18 @@ void oom_kill_process(struct oom_control *oc, struct task_struct *p,
>  	 * pending fatal signal.
>  	 */
>  	rcu_read_lock();
> -	for_each_process(p)
> -		if (p->mm == mm && !same_thread_group(p, victim) &&
> -		    !(p->flags & PF_KTHREAD)) {
> -			if (p->signal->oom_score_adj == OOM_SCORE_ADJ_MIN)
> -				continue;
> +	for_each_process(p) {
> +		if (p->mm != mm)
> +			continue;
> +		if (same_thread_group(p, victim))
> +			continue;
> +		if (unlikely(p->flags & PF_KTHREAD))
> +			continue;
> +		if (p->signal->oom_score_adj == OOM_SCORE_ADJ_MIN)
> +			continue;
>  
> -			do_send_sig_info(SIGKILL, SEND_SIG_FORCED, p, true);
> -		}
> +		do_send_sig_info(SIGKILL, SEND_SIG_FORCED, p, true);
> +	}
>  	rcu_read_unlock();
>  
>  	mmput(mm);
> -- 
> 2.4.3

-- 
Michal Hocko
SUSE Labs
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