On Sunday 28 June 2009 15:41:49 Alan Cox wrote: > Wojciech Puchar wrote:
> > how can i check how much (or maybe - what processes) 2MB pages are > > actually allocated? > > I'm afraid that you can't with great precision. For a given program > execution, on an otherwise idle machine, you can only estimate the > number by looking at the change in the quantity "promotions + mappings - > demotions" before, during, and after the program execution. > > A program can call mincore(2) in order to determine if a virtual address > is part of a 2 or 4MB virtual page. Would it be possible to expose the super page count as kve_super in the kinfo_vmentry struct so that procstat can show this information? If only to determine if one is using the feature and possibly benefiting from it. It looks like sys/kern/kern_proc.c could call mincore around the loop at line 1601 (rev 194498), but I know nothing about the vm subsystem to know the implications or locking involved. There's still 16 bytes of spare to consume, in the kve_vminfo struct though ;) -- Mel _______________________________________________ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "freebsd-hackers-unsubscr...@freebsd.org"
