linux-kernel - [PATCH 3/3] i386: During VM oom condition, kill all threads in process group

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Message-ID: <20070612151912.2869.43167.stgit@farscape.rchland.ibm.com>
Date:	Tue, 12 Jun 2007 10:19:13 -0500
From:	Will Schmidt <will_schmidt@...t.ibm.com>
To:	linuxppc-dev@...abs.org, anton@...ba.org,
	linux-kernel@...r.kernel.org
Cc:	will_schmidt@...t.ibm.com
Subject: [PATCH 3/3] i386: During VM oom condition,
	kill all threads in process group

During a VM oom condition, kill all threads in the process group.

We have had complaints where a threaded application is left in a bad state
after one of it's threads is killed when we hit a VM: out_of_memory
condition.

Killing just one of the process threads can leave the application in a
bad state, whereas killing the entire process group would
allow for the application to restart, or otherwise handled, and makes it very
obvious that something has gone wrong.

This change allows the entire process group to be taken down, rather than
just the one thread.

tested lightly on i386.

Signed-off-by: Will Schmidt <will_schmidt@...t.ibm.com>
---

 arch/i386/mm/fault.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/i386/mm/fault.c b/arch/i386/mm/fault.c
index b8c4e25..a47e712 100644
--- a/arch/i386/mm/fault.c
+++ b/arch/i386/mm/fault.c
@@ -568,7 +568,7 @@ out_of_memory:
 	}
 	printk("VM: killing process %s\n", tsk->comm);
 	if (error_code & 4)
-		do_exit(SIGKILL);
+		do_group_exit(SIGKILL);
 	goto no_context;

 do_sigbus:

-
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