linux-kernel - [PATCH] [176/223] nommu: yield CPU while disposing VM

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

Date:	Mon, 13 Dec 2010 00:48:01 +0100 (CET)
From:	Andi Kleen <andi@...stfloor.org>
To:	steve@...idescorp.com, gerg@...pgear.com, ak@...ux.intel.com,
	kosaki.motohiro@...fujitsu.com, akpm@...ux-foundation.org,
	torvalds@...ux-foundation.org, gregkh@...e.de,
	linux-kernel@...r.kernel.org, stable@...nel.org
Subject: [PATCH] [176/223] nommu: yield CPU while disposing VM

2.6.35-longterm review patch.  If anyone has any objections, please let me know.

------------------
From: Steven J. Magnani <steve@...idescorp.com>

commit 04c3496152394d17e3bc2316f9731ee3e8a026bc upstream.

Depending on processor speed, page size, and the amount of memory a
process is allowed to amass, cleanup of a large VM may freeze the system
for many seconds.  This can result in a watchdog timeout.

Make sure other tasks receive some service when cleaning up large VMs.

Signed-off-by: Steven J. Magnani <steve@...idescorp.com>
Cc: Greg Ungerer <gerg@...pgear.com>
Signed-off-by: Andi Kleen <ak@...ux.intel.com>
Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 mm/nommu.c |    1 +
 1 file changed, 1 insertion(+)

Index: linux/mm/nommu.c
===================================================================
--- linux.orig/mm/nommu.c
+++ linux/mm/nommu.c
@@ -1673,6 +1673,7 @@ void exit_mmap(struct mm_struct *mm)
 		mm->mmap = vma->vm_next;
 		delete_vma_from_mm(vma);
 		delete_vma(mm, vma);
+		cond_resched();
 	}

 	kleave("");
--
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/