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Subject[PATCH] count for buffer IO in page_launder()

Hi,

page_launder() is not counting direct ll_rw_block() IO correctly in the
flushed pages counter.

A page is only counted as flushed if it had its buffer_head's freed,
meaning that pages which have been queued but not freed are not counted.

The following patch against ac5 fixes the problem.



diff -Nur linux.orig/mm/vmscan.c linux/mm/vmscan.c
--- linux.orig/mm/vmscan.c Sat Feb 24 23:30:20 2001
+++ linux/mm/vmscan.c Mon Feb 26 05:45:08 2001
@@ -535,7 +535,7 @@
* buffer pages
*/
if (page->buffers) {
- int wait, clearedbuf;
+ int wait;
/*
* Since we might be doing disk IO, we have to
* drop the spinlock and take an extra reference
@@ -554,7 +554,8 @@
wait = 0; /* No IO */

/* Try to free the page buffers. */
- clearedbuf = try_to_free_buffers(page, wait);
+ if (try_to_free_buffers(page, wait))
+ flushed_pages++;

/*
* Re-take the spinlock. Note that we cannot
@@ -564,10 +565,8 @@
spin_lock(&pagemap_lru_lock);

/* The buffers were not freed. */
- if (!clearedbuf) {
+ if (page->buffers) {
add_page_to_inactive_dirty_list(page);
- if (wait)
- flushed_pages++;

/* The page was only in the buffer cache. */
} else if (!page->mapping) {
diff -Nur linux.orig/fs/buffer.c linux/fs/buffer.c
--- linux.orig/fs/buffer.c Sat Feb 24 23:30:16 2001
+++ linux/fs/buffer.c Mon Feb 26 04:44:54 2001
@@ -1399,7 +1399,8 @@
* instead.
*/
if (!offset) {
- if (!try_to_free_buffers(page, 0)) {
+ try_to_free_buffers(page, 0)
+ if (page->buffers) {
atomic_inc(&buffermem_pages);
return 0;
}
@@ -2413,7 +2414,7 @@
spin_unlock(&free_list[index].lock);
write_unlock(&hash_table_lock);
spin_unlock(&lru_list_lock);
- return 1;
+ return 0;

busy_buffer_page:
/* Uhhuh, start writeback so that we don't end up with all dirty pages */
@@ -2428,6 +2429,7 @@
goto cleaned_buffers_try_again;
}
wakeup_bdflush(0);
+ return 1;
}
return 0;
}





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