On Thu, Mar 15, 2007 at 11:56:59AM -0400, Chuck Ebbert wrote:
> Ashif Harji wrote:
> >
> > This patch unconditionally calls mark_page_accessed to prevent pages,
> > especially for small files, from being evicted from the page cache
> > despite frequent access.
> >
> > Signed-off-by: Ashif Harji <[EMAIL PROTECTED]>
> >
>
> I like mine better -- it leaves the comment:
How about this? It also doesn't break the use-once heuristic.
--
A change to make database style random read() workloads perform better, by
calling mark_page_accessed for some non-page-aligned reads broke the case of
< PAGE_CACHE_SIZE files, which will not get their prev_index moved past the
first page.
Combine both heuristics for marking the page accessed.
Signed-off-by: Nick Piggin <[EMAIL PROTECTED]>
Index: linux-2.6/mm/filemap.c
===================================================================
--- linux-2.6.orig/mm/filemap.c
+++ linux-2.6/mm/filemap.c
@@ -929,7 +929,7 @@ page_ok:
* When (part of) the same page is read multiple times
* in succession, only mark it as accessed the first time.
*/
- if (prev_index != index)
+ if (prev_index != index || !offset)
mark_page_accessed(page);
prev_index = index;
-
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