At 17 Aug 2004 02:51:37 -0700,
Thomas Bushnell BSG wrote:
>
> "Neal H. Walfield" <[EMAIL PROTECTED]> writes:
>
> > > Just a small techical correction: we remove mapping only when we are
> > > remapping page to contain another block. So when page is evicted, it
> > > continues to map the same disk block until ext2fs decides that we want
> > > this page to hold another block (only if page is still evicted, of
> > > course).
> >
> > Well, I think we ought to drain the mapping cache when the page is
> > evicted. This keeps memory usage lower. Further, relative to the
> > cost of reading from disk, adding an entry to the hashes, etc. is
> > cheap.
>
> I'm confused. It sounded like Ognyan was saying that the page is
> still assigned to the same area. But it is necessary to vm_free when
> the kernel tells you to page out. It is unfriendly (and very bad for
> performance) to hold on to the page.
I never said that I completely agreed with the current
implementation. There are still parts which I would like to tune. In
fact, it my message from the 2nd titled "Ognyan's libpager changes" I
explain that
I have begun to review your ext2fs patch for large file system
support. At this point, I have only reviewed the libpager changes
in any detail.
Although I have since studied his changes to ext2fs, I have not yet
posted my reaction on this list.
Neal
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