Date: Wed, 6 May 2009 01:00:09 -0400 From: Ben Kelly <ben@wanderview.com> To: current@freebsd.org Subject: Re: [patch] corrupt memstat_kvm_malloc(3) output and dtrace Message-ID: <EE174440-B065-40FE-8AAC-4FAFF4B782B4@wanderview.com> In-Reply-To: <9A637B27-7C89-49BA-8385-A5B2D5D54BB3@wanderview.com> References: <9A637B27-7C89-49BA-8385-A5B2D5D54BB3@wanderview.com>
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On May 5, 2009, at 10:18 AM, Ben Kelly wrote: > While debugging a problem recently with Alexander Leidinger we > noticed that crashinfo(8) was producing corrupt vmstat -m output. > After doing some digging it appears that memstat_kvm_malloc(3) might > have been broken by this commit: > > http://svn.freebsd.org/viewvc/base?view=revision&revision=179222 > > The problem is that memstat_kvm_malloc(3) assumes that > malloc_type_internal starts with an array of malloc_types_stats > structures. This assumption is no longer true, though, as > mti_probes was inserted at the start of the structure. > > It appears that this (untested) patch might fix the problem: > > http://www.wanderview.com/svn/public/misc/zfs/vmstat_kvm_malloc.diff > > I'm not very familiar with dtrace, though. Does anyone know if this > would cause problems? Just FYI, I was able to recompile and test this patch tonight. It seems to have fixed vmstat -M $core -m output on my machine. - Ben
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