[lkml]   [2014]   [Jul]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH v2 2/4] mm: introduce fincore()
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
PostgreSQL: Support 24x7 - Développement, Expertise et Formation[unhandled content-type:application/pgp-signature]
 \ /
  Last update: 2014-07-04 17:41    [W:0.111 / U:6.352 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site