I agree... pid is not a good idea. So i thought of something else... the swp_entry_t. What i forgot was that this is only for anonymous pages... disk buffers and mmapped pages are not put on swap (right?). So, I'm looking at something else now... primarily the page->private field. I guess, what i need is an identifier to tag every page that leaves the cache... whether anonymous, mmapped or disk buffer. Unfortunately I cannot find such an id. Actually, this is all that holds me up... the rest of what i need to do is in place - mentally that is. :) So, I could really use a tip ;)
thanks
Rahul
Rik van Riel wrote:
On Tue, 22 Mar 2005, Rahul Iyer wrote:
In one of the earlier CART threads, you had mentioned that you had a way of
representing each non resident page by a 32 bit value. Could you please
elaborate on this? I haven't given too much thought on this, but i was
thinking of a 64 bit value... upper 32 bits being pid and lower 32 being the
virtual address. Would this work?
Pid doesn't seem like the best idea, since you also need to represent page cache, and page cache files do not have a PID. You also need to remember whether the page was on the "frequency" or "recency" list.
64 bits should indeed be enough for all of this ;)
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