linux-kernel - [PATCH 4/6] taskstats_tgid

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Date:	Fri, 27 Oct 2006 03:21:46 +0400
From:	Oleg Nesterov <oleg@...sign.ru>
To:	Andrew Morton <akpm@...l.org>
Cc:	Shailabh Nagar <nagar@...son.ibm.com>,
	Balbir Singh <balbir@...ibm.com>, Jay Lan <jlan@....com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 4/6] taskstats_tgid_alloc: optimization

Every subthread (except first) does unneeded kmem_cache_alloc/kmem_cache_free.

Signed-off-by: Oleg Nesterov <oleg@...sign.ru>

--- STATS/include/linux/taskstats_kern.h~4_alloc	2006-10-27 01:28:31.000000000 +0400
+++ STATS/include/linux/taskstats_kern.h	2006-10-27 01:39:10.000000000 +0400
@@ -32,6 +32,9 @@ static inline void taskstats_tgid_alloc(
 	struct taskstats *stats;
 	unsigned long flags;
 
+	if (sig->stats != NULL)
+		return;
+
 	stats = kmem_cache_zalloc(taskstats_cache, SLAB_KERNEL);
 	if (!stats)
 		return;

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