linux-kernel - [234/289] nommu: yield CPU while disposing VM

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Message-Id: <20101208005744.818414498@clark.site>
Date:	Tue, 07 Dec 2010 17:00:11 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	"Steven J. Magnani" <steve@...idescorp.com>,
	Greg Ungerer <gerg@...pgear.com>
Subject: [234/289] nommu: yield CPU while disposing VM

2.6.36-stable review patch.  If anyone has any objections, please let us 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>
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(+)

--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -1668,6 +1668,7 @@ void exit_mmap(struct mm_struct *mm)
 		mm->mmap = vma->vm_next;
 		delete_vma_from_mm(vma);
 		delete_vma(mm, vma);
+		cond_resched();
 	}

 	kleave("");

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