linux-kernel - [PATCH] Shrink struct task

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Message-ID: <20070812173728.GC5871@martell.zuzino.mipt.ru>
Date:	Sun, 12 Aug 2007 21:37:28 +0400
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	akpm@...l.org
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] Shrink struct task_struct::oomkilladj

oomkilladj in int, but values which can be assigned to it are -17, [-16, 15],
thus fitting into s8.

While patch itself doesn't help in making task_struct smaller, because of
natural alignment of ->link_count, it will make picture clearer wrt futher
task_struct reduction patches. My plan is to move ->fpu_counter and
->oomkilladj after ->ioprio filling hole on i386 and x86_64. But that's for
later, because bloated distro configs need looking at as well.

Signed-off-by: Alexey Dobriyan <adobriyan@...il.com>
---

 include/linux/sched.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1052,7 +1052,7 @@ struct task_struct {
 	 * a short time
 	 */
 	unsigned char fpu_counter;
-	int oomkilladj; /* OOM kill score adjustment (bit shift). */
+	s8 oomkilladj; /* OOM kill score adjustment (bit shift). */
 	char comm[TASK_COMM_LEN]; /* executable name excluding path
 				     - access with [gs]et_task_comm (which lock
 				       it with task_lock())

-
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