linux-kernel - [PATCH][V2] nommu: yield CPU while disposing VM

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Date:	Tue, 16 Nov 2010 07:06:45 -0600
From:	"Steven J. Magnani" <steve@...idescorp.com>
To:	linux-mm@...ck.org
Cc:	stable@...nel.org, linux-kernel@...r.kernel.org, gerg@...pgear.com,
	kosaki.motohiro@...fujitsu.com, akpm@...ux-foundation.org,
	"Steven J. Magnani" <steve@...idescorp.com>
Subject: [PATCH][V2] nommu: yield CPU while disposing VM

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>
---
diff -uprN a/mm/nommu.c b/mm/nommu.c
--- a/mm/nommu.c	2010-11-15 07:53:45.000000000 -0600
+++ b/mm/nommu.c	2010-11-15 07:57:13.000000000 -0600
@@ -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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