Messages in this thread | | | Date | Mon, 21 Jan 2002 04:01:27 +0300 | From | Hans Reiser <> | Subject | Re: Possible Idea with filesystem buffering. |
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Rik van Riel wrote:
>On Mon, 21 Jan 2002, Hans Reiser wrote: > >>Suppose we do what you ask, and always write the page (as well as some >>other pages) to disk. This will result in the filesystem cache as a >>whole receiving more pressure than other caches that only write one >>page in response to pressure. This is unbalanced, leads to some >>caches having shorter average page lifetimes than others, and it is >>therefor suboptimal. Yes? >> > >If your ->writepage() writes pages to disk it just means >that reiserfs will be able to clean its pages faster than >the other filesystems. > the logical extreme of this is that no write caching should be done at all, only read caching?
> > >This means the VM will not call reiserfs ->writepage() as >often as for the other filesystems, since more of the >pages it finds will already be clean and freeable. > >I guess the only way to unbalance the caches is by actually >freeing pages in ->writepage, but I don't see any real reason >why you'd want to do that... > >regards, > >Rik > It would unbalance the write cache, not the read cache.
Hans
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