* [PATCH] nommu: yield CPU periodically while disposing large VM
@ 2010-10-21 12:53 Steven J. Magnani
0 siblings, 0 replies; only message in thread
From: Steven J. Magnani @ 2010-10-21 12:53 UTC (permalink / raw)
To: linux-mm; +Cc: dhowells, linux-kernel, Steven J. Magnani
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@digidescorp.com>
---
diff -uprN a/mm/nommu.c b/mm/nommu.c
--- a/mm/nommu.c 2010-10-21 07:42:23.000000000 -0500
+++ b/mm/nommu.c 2010-10-21 07:46:50.000000000 -0500
@@ -1656,6 +1656,7 @@ SYSCALL_DEFINE2(munmap, unsigned long, a
void exit_mmap(struct mm_struct *mm)
{
struct vm_area_struct *vma;
+ unsigned long next_yield = jiffies + HZ;
if (!mm)
return;
@@ -1668,6 +1669,11 @@ void exit_mmap(struct mm_struct *mm)
mm->mmap = vma->vm_next;
delete_vma_from_mm(vma);
delete_vma(mm, vma);
+ /* Yield periodically to prevent watchdog timeout */
+ if (time_after(jiffies, next_yield)) {
+ cond_resched();
+ next_yield = jiffies + HZ;
+ }
}
kleave("");
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
^ permalink raw reply [flat|nested] only message in thread
only message in thread, other threads:[~2010-10-21 12:54 UTC | newest]
Thread overview: (only message) (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2010-10-21 12:53 [PATCH] nommu: yield CPU periodically while disposing large VM Steven J. Magnani
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).