From: Ingo Molnar <mingo@elte.hu>
The attached patch fixes long scheduling latencies in get_user_pages().
Has been tested as part of the -VP patchset.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---
25-akpm/mm/memory.c | 1 +
1 files changed, 1 insertion(+)
diff -puN mm/memory.c~sched-mm-fix-scheduling-latencies-in-get_user_pages mm/memory.c
--- 25/mm/memory.c~sched-mm-fix-scheduling-latencies-in-get_user_pages Tue Sep 14 17:40:20 2004
+++ 25-akpm/mm/memory.c Tue Sep 14 17:40:46 2004
@@ -791,6 +791,7 @@ int get_user_pages(struct task_struct *t
*/
if (vm_io)
goto no_follow;
+ cond_resched_lock(&mm->page_table_lock);
while (!(map = follow_page(mm, start, lookup_write))) {
/*
* Shortcut for anonymous pages. We don't want
_