Messages in this thread | | | From | Daniel Phillips <> | Subject | Re: [resent PATCH] Re: very slow parallel read performance | Date | Mon, 27 Aug 2001 18:04:42 +0200 |
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On August 27, 2001 05:14 pm, Rik van Riel wrote: > On Mon, 27 Aug 2001, Alex Bligh - linux-kernel wrote: > > > A nit: I think it's a MRU list you want. > > Absolutely, however ... > > > If you are reading > > ahead (let's have caps for a page that has been used for reading, > > as well as read from the disk, and lowercase for read-ahead that > > has not been used): > > ABCDefghijklmnopq > > | | > > read disk > > ptr head > > and you want to reclaim memory, you want to drop (say) 'pq' > > to get > > ABCDefghijklmno > > for two reasons: firstly because 'efg' etc. are most likely > > to be used NEXT, and secondly because the diskhead is nearer > > 'pq' when you (inevitably) have to read it again. > > This is NOT MRU, since p and q have not been used yet. > In this example you really want to drop D and C instead.
What we mean by "drop" is "deactivate".
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