Peter Zijlstra wrote: > Also note that doing large gup() with gup_fast() will be undesirable due > to it disabling IRQs. So iterating say several MB worth of pages will > hurt like crazy. Currently all gup_fast() users do a single page lookup. >
In 2.6.29, fs/bio.c:955, fs/direct-io.c:153 and fs/splice.c:1222 do multiple-pages lookup at once. The latter might be limited to 16 pages because of the pipe-depth, I don't know about the formers. Is there some sort of reasonable limit? A couple dozens pages at once maybe? Brice ------------------------------------------------------------------------------ -- _______________________________________________ Dri-devel mailing list Dri-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/dri-devel
