Le vendredi 4 juillet 2014 03:12:30 Christoph Hellwig a écrit : > On Thu, Jul 03, 2014 at 05:52:13PM -0400, Naoya Horiguchi wrote: > > This patch provides a new system call fincore(2), which provides > > mincore()- like information, i.e. page residency of a given file. > > But unlike mincore(), fincore() has a mode flag which allows us to > > extract detailed information about page cache like pfn and page > > flag. This kind of information is very helpful, for example when > > applications want to know the file cache status to control the IO > > on their own way. > > It's still a nasty multiplexer for multiple different reporting > formats in a single system call. How about your really just do a > fincore that mirrors mincore instead of piggybacking exports of > various internal flags (tags and page flags onto it. The fincore à la mincore got some arguments against it too. It seems this implementations try (I've not tested nor have a close look yet) to answer both concerns : have details and also possible to have aggregation function not too expansive. -- Cédric Villemain +33 (0)6 20 30 22 52 http://2ndQuadrant.fr/ PostgreSQL: Support 24x7 - Développement, Expertise et Formation
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