Re: Syncing the page cache, take 2

[Daniel Phillips <news-innominate.list.linux.mm@innominate.de>]

Rik van Riel wrote:
> 
> On Tue, 15 Aug 2000, Stephen C. Tweedie wrote:
> 
> > Correct.  We have plans to change this in 2.5, basically by
> > removing the VM's privileged knowledge about the buffer cache
> > and making the buffer operations (write-back, unmap etc.) into
> > special cases of generic address-space operations.  For 2.4,
> > it's really to late to do anything about this.
> 
> please take a look at my VM patch at http://www.surriel.com/patches/
> (either the -test4 or the -test7-pre4 one).
> 
> If you look closely at mm/vmscan.c::page_launder(), you'll see
> that we should be able to add the flush callback with only about
> 5 to 10 lines of changed code ...
> 
> (and even more ... we just about *need* the flush callback when
> we're running in a multi-queue VM)

OK, but what about the case where the filesystem knows it wants the page
cache to flush *right now*?  For example, when a filesystem wants to be
sure the page cache is synced through to buffers just before marking a
consistent state in the journal, say.  How does it make that happen?

-- 
Daniel
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