Date: Tue, 25 Oct 2011 09:27:24 -0700 From: Chuck Tuffli <ctuffli@gmail.com> To: mj@feral.com Cc: freebsd-hackers@freebsd.org Subject: Re: determining bus_dma memory usage by driver Message-ID: <CAKAYmMK1vhN8RJ-L0iZ-GYjKqk9tg0MDoknBs1sNmXkhV1gW5w@mail.gmail.com> In-Reply-To: <4EA62F32.6010305@feral.com> References: <CAKAYmMLK7ryu6dVyy_gh6VxkzCMCEXq-8zL=fWbExBV3oijc-g@mail.gmail.com> <4EA62F32.6010305@feral.com>
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On Mon, Oct 24, 2011 at 8:38 PM, Matthew Jacob <mj@feral.com> wrote: > > On 10/24/2011 5:21 PM, Chuck Tuffli wrote: >> >> Is there an easy way to determine the amount of bus_dma memory >> allocated by a driver? Something similar to vmstat -m >> > > bus_dma memory allocations are platform specific. Looking at least amd64 you can see that the memory is carved out M_DEVBUF. OK, so do a diff of vmstat -m | grep devbuf before and after driver load would get me the right number? Does this double count any memory reported by the MALLOC_DEFINE()? ---chuck
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