Messages in this thread | | | Date | Mon, 5 Apr 2004 10:35:49 +0200 | From | Jörn Engel <> | Subject | Re: [PATCH] cowlinks v2 |
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On Sat, 3 April 2004 20:43:44 +0100, Jamie Lokier wrote: > > Btw, I'm not suggesting sharing page cache entries.
But I am!!!
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.
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?
Jörn
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