---
25-akpm/mm/pdflush.c | 18 +++++++++++++++++-
1 files changed, 17 insertions(+), 1 deletion(-)
diff -puN mm/pdflush.c~pdflush-diag mm/pdflush.c
--- 25/mm/pdflush.c~pdflush-diag 2004-03-30 20:43:46.401329640 -0800
+++ 25-akpm/mm/pdflush.c 2004-03-30 20:43:46.403329336 -0800
@@ -88,6 +88,8 @@ struct pdflush_work {
unsigned long when_i_went_to_sleep;
};
+static int wakeup_count = 100;
+
static int __pdflush(struct pdflush_work *my_work)
{
current->flags |= PF_FLUSHER;
@@ -114,7 +116,10 @@ static int __pdflush(struct pdflush_work
spin_lock_irq(&pdflush_lock);
if (!list_empty(&my_work->list)) {
- printk("pdflush: bogus wakeup!\n");
+ if (wakeup_count > 0) {
+ wakeup_count--;
+ printk("pdflush: bogus wakeup!\n");
+ }
my_work->fn = NULL;
continue;
}
@@ -190,6 +195,7 @@ int pdflush_operation(void (*fn)(unsigne
{
unsigned long flags;
int ret = 0;
+ static int poke_count = 0;
if (fn == NULL)
BUG(); /* Hard to diagnose if it's deferred */
@@ -198,9 +204,19 @@ int pdflush_operation(void (*fn)(unsigne
if (list_empty(&pdflush_list)) {
spin_unlock_irqrestore(&pdflush_lock, flags);
ret = -1;
+ if (wakeup_count < 100 && poke_count < 10) {
+ printk("%s: no threads\n", __FUNCTION__);
+ dump_stack();
+ poke_count++;
+ }
} else {
struct pdflush_work *pdf;
+ if (wakeup_count < 100 && poke_count < 10) {
+ printk("%s: found a thread\n", __FUNCTION__);
+ dump_stack();
+ poke_count++;
+ }
pdf = list_entry(pdflush_list.next, struct pdflush_work, list);
list_del_init(&pdf->list);
if (list_empty(&pdflush_list))
_