linux-kernel - [PATCH] procfs : reorder struct pid_dentry to save space on 64bit archs, and constify them

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Message-Id: <200703082040.57150.dada1@cosmosbay.com>
Date:	Thu, 8 Mar 2007 20:40:57 +0100
From:	Eric Dumazet <dada1@...mosbay.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] procfs : reorder struct pid_dentry to save space on 64bit archs, and constify them

This patches changes the order of fields of struct pid_entry (file 
fs/proc/base.c) in order to avoid a hole on 64bit archs. (8 bytes saved per 
object)

It also changes all pid_entry arrays to be const qualified, to make clear they 
must not be modified.

Before (on x86_64) :

# size fs/proc/base.o
   text    data     bss     dec     hex filename
  15549    2192       0   17741    454d fs/proc/base.o

After :

# size fs/proc/base.o
   text    data     bss     dec     hex filename
  17229     176       0   17405    43fd fs/proc/base.o

Thats 336 bytes saved on kernel size on x86_64

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

 fs/proc/base.c |   53 +++++++++++++++++++++++------------------------
 1 file changed, 27 insertions(+), 26 deletions(-)

View attachment "pid_entry.patch" of type "text/plain" (6919 bytes)