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Subjectbdflush synchronous IO on prerelease-diff

Hi Linus,

I've noticed you changed bdflush to do synchronous IO on page_launder().

That seems to be a performance problem, since kflushd will have to wait
for dirty buffers to get synced instead looping on the inactive dirty
list more often.

Here is a patch to change this.

--- linux.orig/fs/buffer.c Wed Jan 3 22:43:24 2001
+++ linux/fs/buffer.c Thu Jan 4 00:28:50 2001
@@ -2710,7 +2710,7 @@

flushed = flush_dirty_buffers(0);
if (free_shortage())
- flushed += page_launder(GFP_KERNEL, 1);
+ flushed += page_launder(GFP_KERNEL, 0);

* If there are still a lot of dirty buffers around,

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