linux-kernel - [PATCH] [DCACHE] : avoid RCU for never hashed dentries

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Date:	Wed, 22 Nov 2006 18:53:26 +0100
From:	Eric Dumazet <dada1@...mosbay.com>
To:	Andrew Morton <akpm@...l.org>
Cc:	Al Viro <viro@....linux.org.uk>, linux-kernel@...r.kernel.org,
	David Miller <davem@...emloft.net>
Subject: [PATCH] [DCACHE] : avoid RCU for never hashed dentries

Some dentries dont need to be globally visible in dentry hashtable. (pipes & 
sockets)

Such dentries dont need to wait for a RCU grace period at delete time. Being 
able to free them permits a better CPU cache use (hot cache)

This patch combined with (dont insert pipe dentries into dentry_hashtable)
reduced time of { pipe(p); close(p[0]); close(p[1]);} on my UP machine (1.6 
GHz Pentium-M) from 3.23 us to 2.86 us
(But this patch does not depend on other patches, only bench results)

Signed-off-by: Eric Dumazet <dada1@...mosbay.com>

View attachment "avoid_rcu_dcache.patch" of type "text/plain" (1133 bytes)