On Tue, 29 Jan 2002, Andrew Morton wrote:
> Andreas Dilger wrote:
> >
> > But if it is unused and not recently referenced, there is little benefit
> > in keeping it around, is there?
>
> In all of this, please remember that all caches are not of
> equal value-per-byte. A single page contains 32 dentries,
> and can thus save up to 32 disk seeks. It's potentially
> a *lot* more valuable than a (single-seek) pagecache page.
Or it might equally well be 32 contiguous directory entries that you
scanned over to get to the file you wanted. If it's 32 hot items, as a
page it's going to be aged significantly less than one equally hot
pagecache page, so I don't think we need to worry about that too much.
-- "Love the dolphins," she advised him. "Write by W.A.S.T.E.."- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Thu Jan 31 2002 - 21:01:13 EST