From: Daniel Phillips <phill...@google.com>
---
diff -ru linux-2.6.24.2/mm/backing-dev.c
linux-2.6.24.2-less.throttle.failed/mm/backing-dev.c
--- linux-2.6.24.2/mm/backing-dev.c 2008-02-10 21:51:11.000000000 -0800
+++ linux-2.6.24.2-less.throttle.failed/mm/backing-dev.c 2008-02-13
11:25:57.000000000 -0800
@@ -83,6 +83,10 @@
DEFINE_WAIT(wait);
wait_queue_head_t *wqh = &congestion_wqh[rw];
+ if ((current->flags & PF_LESS_THROTTLE) && printk_ratelimit()) {
+ printk(KERN_WARNING "PF_LESS_THROTTLE process %s[%i] entered
congestion_wait!\n", current->comm, current->pid);
+ dump_stack();
+ }
prepare_to_wait(wqh, &wait, TASK_UNINTERRUPTIBLE);
ret = io_schedule_timeout(timeout);
finish_wait(wqh, &wait);
Only in linux-2.6.24.2-less.throttle.failed/mm: backing-dev.c.orig
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