Re: [PATCH *] 2.4.0 VM improvements

[Marcelo Tosatti]

On Sun, 7 Jan 2001, Rik van Riel wrote:

> The patch is available at this URL:
> 
> 	http://www.surriel.com/patches/2.4/2.4.0-tunevm+rss

I have one improvement on top of your patch.

Now its not more "rare" (as the comment on the code stated) to have
pages with page->age == 0 being called on lru_cache_add. 

This patch should make the overhead of calling lru_cache_add on pages with
page->age == 0 smaller. 

--- mm/swap.c.orig      Sun Jan  7 15:59:37 2001
+++ mm/swap.c   Sun Jan  7 16:11:21 2001
@@ -233,10 +233,12 @@
        if (!PageLocked(page))
                BUG();
        DEBUG_ADD_PAGE
-       add_page_to_active_list(page);
-       /* This should be relatively rare */
-       if (!page->age)
-               deactivate_page_nolock(page);
+
+       if (page->age)
+               add_page_to_active_list(page);
+       else
+               add_page_to_inactive_dirty_list(page);
+
        spin_unlock(&pagemap_lru_lock);
 }