Date: Sat, 9 Jun 2012 11:38:22 +0300 From: Konstantin Belousov <kostikbel@gmail.com> To: Mikolaj Golub <trociny@freebsd.org> Cc: Alan Cox <alc@freebsd.org>, Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>, Robert Watson <rwatson@freebsd.org>, Ivan Voras <ivoras@freebsd.org>, freebsd-hackers@freebsd.org Subject: Re: SuperPages utilization survey Message-ID: <20120609083822.GJ85127@deviant.kiev.zoral.com.ua> In-Reply-To: <86sje5kkl6.fsf@kopusha.home.net> References: <jqac8f$6mn$1@dough.gmane.org> <alpine.BSF.2.00.1206011429160.20357@wojtek.tensor.gdynia.pl> <CAF-QHFXsi3SaF-rmFK-qM89LfnStKwRWN1-HRM4yg4Bt_SFAOg@mail.gmail.com> <86sje5kkl6.fsf@kopusha.home.net>
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--qhD8kUEc5MK9MdKG Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Sat, Jun 09, 2012 at 10:31:17AM +0300, Mikolaj Golub wrote: >=20 > On Fri, 1 Jun 2012 14:54:48 +0200 Ivan Voras wrote: >=20 > IV> On 1 June 2012 14:35, Wojciech Puchar <wojtek@wojtek.tensor.gdynia.p= l> wrote: > >>> http://people.freebsd.org/~ivoras/stuff/spsurvey.py >=20 > ... >=20 > IV> If anyone posts more data, I'll analyse it. I'm more worried about t= he > IV> granularity of procstat, where it marks the entire region if a single > IV> superpage exists in it - it means any such analysis is only > IV> approximate. >=20 > Here is a patch (for kernel and procstat) that allows to see amount of pa= ges > mapped to superpages. >=20 > http://people.freebsd.org/~trociny/procstat-superpages.cnt.1.patch >=20 > Not sure it is useful enough to be committed. Superpage aggregates mappings for several normal-sized pages. As a consequence, when you iterate over small pages in sysctl_kern_proc_vmmap(), you account each superpage as many time as much constituent small pages it contains. --qhD8kUEc5MK9MdKG Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (FreeBSD) iEYEARECAAYFAk/TC34ACgkQC3+MBN1Mb4hc4QCfSIxNSXxqps0HBccBbXYQfv+X opcAnRoP7eT+az82ghZZm+3HwUNnjdAX =Hxjs -----END PGP SIGNATURE----- --qhD8kUEc5MK9MdKG--
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