Date: Wed, 07 Mar 2012 15:16:57 +0000 From: Luke Marsden <luke-lists@hybrid-logic.co.uk> To: J B <jb.1234abcd@gmail.com> Cc: tech@hybrid-logic.co.uk, freebsd-questions@freebsd.org Subject: Re: FreeBSD 8.2 - active plus inactive memory leak!? Message-ID: <1331133417.2589.101.camel@pow> In-Reply-To: <CAJXMFhHyyanD4UH9%2BNqN7=E=PA_vs9YFP2vVR%2BxqF8ABRoteRg@mail.gmail.com> References: <CAJXMFhHyyanD4UH9%2BNqN7=E=PA_vs9YFP2vVR%2BxqF8ABRoteRg@mail.gmail.com>
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On Wed, 2012-03-07 at 13:33 +0100, J B wrote: > On Wed, 07 Mar 2012 10:23:38 +0200, Konstantin Belousov wrote: > > > On Wed, Mar 07, 2012 at 12:36:21AM +0000, Luke Marsden wrote: > > ... > >> I'm trying to confirm that, on a system with no pages swapped out, that > >> the following is a true statement: > >> > >> a page is accounted for in active + inactive if and only if it > >> corresponds to one or more of the pages accounted for in the > >> resident memory lists of all the processes on the system (as > >> per the output of 'top' and 'ps') > > No. > > > > The pages belonging to vnode vm object can be active or inactive or > > cached but not mapped into any process address space. > > I wonder if some ideas by Denys Vlasenko contained in this thread > http://comments.gmane.org/gmane.linux.redhat.fedora.devel/157706 > would be useful ? https://github.com/pixelb/scripts/blob/master/scripts/ps_mem.py This looks like a really useful script, and looks like it works under FreeBSD with linprocfs. Good find! Cheers, Luke > ... > "Today, I'm looking at my process list, sorted by amount of dirtied pages > (which very closely matches amount of malloced and used space - that is, > malloced, but not-written to memory areas are not included). > This is the most expensive type of pages, they can't be discarded. > If we would be in memory squeeze, kernel will have to swap them out, > if swap exists, otherwise kernel can't do anything at all." > ... > "Note that any shared pages (such as glibc) are not freed this way; > also, non-mapped pages (such as large, but unused malloced space, or large, > but unused file mappings) also do not contribute to MemFree increase." > > jb -- CTO, Hybrid Logic +447791750420 | +1-415-449-1165 | www.hybrid-cluster.com
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