Messages in this thread | | | Date | Mon, 5 Apr 2004 13:41:58 +0100 | From | Jamie Lokier <> | Subject | Re: [PATCH] cowlinks v2 |
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Jörn Engel wrote: > Sharing the page cache is more important to me than sharing disk > space. Disk space is cheap, but increasing memory beyond 1GiB in my > notebook is not and 1GiB is too little, so memory is the real > constraint.
Lucky you! I have 192MB, that's as much as it can take.
> And it looks like Pavel already found the solution. Whenever doing > something fishy that would confuse the page cache, we > 1. lock > 2. invalidate page cache for all files belonging to that cow entity > 3. copyfile(), write(), or whatever > 4. unlock > > This is always possibly, because page cache for cow-files is never > read-write. If it was, we would have done 1-4 before and now have a > regular (non-cow) file. > > Did I miss something?
Just some interesting indirection or substitution of address_space objects needed in the vmas, to map the right pages.
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