linux-kernel - Re: [PATCH 1/2] mm, oom: introduce oom reaper

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Message-ID: <20160106091027.GA13900@dhcp22.suse.cz>
Date:	Wed, 6 Jan 2016 10:10:27 +0100
From:	Michal Hocko <mhocko@...nel.org>
To:	Paul Gortmaker <paul.gortmaker@...driver.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>,
	Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
	David Rientjes <rientjes@...gle.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Hugh Dickins <hughd@...gle.com>,
	Andrea Argangeli <andrea@...nel.org>,
	Rik van Riel <riel@...hat.com>, linux-mm@...ck.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] mm, oom: introduce oom reaper

On Mon 21-12-15 15:38:21, Paul Gortmaker wrote:
[...]
> ...use one of the non-modular initcalls here?   I'm trying to clean up most of
> the non-modular uses of modular macros etc. since:
> 
>  (1) it is easy to accidentally code up an unused module_exit function
>  (2) it can be misleading when reading the source, thinking it can be
>       modular when the Makefile and/or Kconfig prohibit it
>  (3) it requires the include of the module.h header file which in turn
>      includes nearly everything else, thus increasing CPP overhead.
> 
> I figured no point in sending a follow on patch since this came in via
> the akpm tree into next and that gets rebased/updated regularly.

Sorry for the late reply. I was mostly offline throughout the last 2
weeks last year. Is the following what you would like to see? If yes I
will fold it into the original patch.

Thanks!
---
diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 7a9678c50edd..1ece40b94725 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -36,7 +36,7 @@
 #include <linux/ftrace.h>
 #include <linux/ratelimit.h>
 #include <linux/kthread.h>
-#include <linux/module.h>
+#include <linux/init.h>
 
 #include <asm/tlb.h>
 #include "internal.h"
@@ -541,7 +541,7 @@ static int __init oom_init(void)
 	}
 	return 0;
 }
-module_init(oom_init)
+subsys_initcall(oom_init)
 #else
 static void wake_oom_reaper(struct mm_struct *mm)
 {
-- 
Michal Hocko
SUSE Labs
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