linux-kernel - [PATCH v5 4/4] exec: document acct_arg

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Message-ID: <20110306170311.GE24175@redhat.com>
Date:	Sun, 6 Mar 2011 18:03:11 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	LKML <linux-kernel@...r.kernel.org>, linux-mm <linux-mm@...ck.org>,
	pageexec@...email.hu, Solar Designer <solar@...nwall.com>,
	Eugene Teo <eteo@...hat.com>,
	Brad Spengler <spender@...ecurity.net>,
	Roland McGrath <roland@...hat.com>,
	Milton Miller <miltonm@....com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Subject: [PATCH v5 4/4] exec: document acct_arg_size()

Add the comment to explain acct_arg_size().

Signed-off-by: Oleg Nesterov <oleg@...hat.com>
Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
---

 fs/exec.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

--- 38/fs/exec.c~4_doc_acct_arg_size	2011-03-06 17:56:26.000000000 +0100
+++ 38/fs/exec.c	2011-03-06 17:56:47.000000000 +0100
@@ -164,7 +164,12 @@ out:
 }
 
 #ifdef CONFIG_MMU
-
+/*
+ * The nascent bprm->mm is not visible until exec_mmap() but it can
+ * use a lot of memory, account these pages in current->mm temporary
+ * for oom_badness()->get_mm_rss(). Once exec succeeds or fails, we
+ * change the counter back via acct_arg_size(0).
+ */
 static void acct_arg_size(struct linux_binprm *bprm, unsigned long pages)
 {
 	struct mm_struct *mm = current->mm;

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