From: Eric Dumazet <dada1@cosmosbay.com>
Date: Sun, 30 Oct 2005 23:02:16 +0000 (-0800)
Subject: [PATCH] reduce sizeof(struct file)
X-Git-Tag: v2.6.15-rc1~59^2~15^2~103
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2f51201662b28dbf8c15fb7eb972bc51c6cc3fa5;p=pandora-kernel.git

[PATCH] reduce sizeof(struct file)

Now that RCU applied on 'struct file' seems stable, we can place f_rcuhead
in a memory location that is not anymore used at call_rcu(&f->f_rcuhead,
file_free_rcu) time, to reduce the size of this critical kernel object.

The trick I used is to move f_rcuhead and f_list in an union called f_u

The callers are changed so that f_rcuhead becomes f_u.fu_rcuhead and f_list
becomes f_u.f_list

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

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