linux-kernel - [PATCH 1/2] virtio_balloon: disable oom killer when fill balloon

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:	Tue, 26 Apr 2011 13:29:16 +0800
From:	Dave Young <hidave.darkstar@...il.com>
To:	kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] virtio_balloon: disable oom killer when fill balloon

When memory pressure is high, virtio ballooning will probably cause oom killing.
Even if alloc_page with GFP_NORETRY itself does not directly trigger oom it
will make memory becoming low then memory alloc of other processes will trigger
oom killing. It is not desired behaviour.

Here disable oom killer in fill_balloon to address this issue.

Signed-off-by: Dave Young <hidave.darkstar@...il.com>
---
 drivers/virtio/virtio_balloon.c |    3 +++
 1 file changed, 3 insertions(+)

--- linux-2.6.orig/drivers/virtio/virtio_balloon.c	2010-10-13 10:14:38.000000000 +0800
+++ linux-2.6/drivers/virtio/virtio_balloon.c	2011-04-26 11:38:43.979785141 +0800
@@ -25,6 +25,7 @@
 #include <linux/freezer.h>
 #include <linux/delay.h>
 #include <linux/slab.h>
+#include <linux/oom.h>
 
 struct virtio_balloon
 {
@@ -102,6 +103,7 @@ static void fill_balloon(struct virtio_b
 	/* We can only do one array worth at a time. */
 	num = min(num, ARRAY_SIZE(vb->pfns));
 
+	oom_killer_disable();
 	for (vb->num_pfns = 0; vb->num_pfns < num; vb->num_pfns++) {
 		struct page *page = alloc_page(GFP_HIGHUSER | __GFP_NORETRY |
 					__GFP_NOMEMALLOC | __GFP_NOWARN);
@@ -119,6 +121,7 @@ static void fill_balloon(struct virtio_b
 		vb->num_pages++;
 		list_add(&page->lru, &vb->pages);
 	}
+	oom_killer_enable();
 
 	/* Didn't get any?  Oh well. */
 	if (vb->num_pfns == 0)
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/