[patch 6/19] mark_buffer_dirty() speedup

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mark_buffer_dirty() is showing up on Anton's graphs. Avoiding the
buslocked RMW if the buffer is already dirty should fix that up.

--- 2.5.22/fs/buffer.c~mark_buffer_dirty-speedup Sun Jun 16 22:50:17 2002
+++ 2.5.22-akpm/fs/buffer.c Sun Jun 16 23:22:47 2002
@@ -1218,7 +1218,7 @@ void mark_buffer_dirty(struct buffer_hea
 {
         if (!buffer_uptodate(bh))
                 buffer_error();
- if (!test_set_buffer_dirty(bh))
+ if (!buffer_dirty(bh) && !test_set_buffer_dirty(bh))
                 __set_page_dirty_nobuffers(bh->b_page);
 }
 

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