Date: Wed, 04 Sep 2013 09:11:28 -0500 From: Nathan Whitehorn <nwhitehorn@freebsd.org> To: Ryan Stone <rysto32@gmail.com> Cc: freebsd-geom@freebsd.org, "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org>, Alexander Motin <mav@freebsd.org>, "freebsd-current@freebsd.org" <freebsd-current@freebsd.org>, FreeBSD SCSI <freebsd-scsi@freebsd.org>, =?ISO-8859-1?Q?Olivier_Cochard?= =?ISO-8859-1?Q?-Labb=E9?= <olivier@cochard.me>, Outback Dingo <outbackdingo@gmail.com> Subject: Re: [RFC][CFT] GEOM direct dispatch and fine-grained CAM locking Message-ID: <52273F90.7020303@freebsd.org> In-Reply-To: <CAFMmRNzkL%2BuOsC=2Cq_S4Zm5fkmrQRNYcKfijA8yyYcxvLaXPQ@mail.gmail.com> References: <520D4ADB.50209@FreeBSD.org> <5224511D.4090503@FreeBSD.org> <20130903134251.GB43281@caravan.chchile.org> <CAKYr3zwjQ9K1c5smZXTESa3T5UnchYaipYQCS2OAJOUFyPBGww@mail.gmail.com> <CA%2Bq%2BTcoeHDbkCOXvBjbbzOKCbb7RLYqG0jn9bHNn_CZgLGarLg@mail.gmail.com> <5226DAB0.1060303@FreeBSD.org> <52272B6F.9060308@freebsd.org> <CAFMmRNzkL%2BuOsC=2Cq_S4Zm5fkmrQRNYcKfijA8yyYcxvLaXPQ@mail.gmail.com>
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On 09/04/13 08:20, Ryan Stone wrote: > On Wed, Sep 4, 2013 at 8:45 AM, Nathan Whitehorn <nwhitehorn@freebsd.org> wrote: >> Could you describe what this macro is supposed to do so that we can do the >> porting work? >> -Nathan > #define GET_STACK_USAGE(total, used) > > GET_STACK_USAGE sets the variable passed in total to the total amount > of stack space available to the current thread. used is set to the > amount of stack space currently used (this does not have to have > byte-precision). Netgraph uses this to decide when to stop recursing > and instead defer to a work queue (to prevent stack overflow). I > presume that Alexander is using it in a similar way. It looks like > the amd64 version could be ported to other architectures quite easily > if you were to account for stacks that grow up and stacks that grow > down: > > http://svnweb.freebsd.org/base/head/sys/amd64/include/proc.h?revision=233291&view=markup > > /* Get the current kernel thread stack usage. */ > #define GET_STACK_USAGE(total, used) do { \ > struct thread *td = curthread; \ > (total) = td->td_kstack_pages * PAGE_SIZE; \ > (used) = (char *)td->td_kstack + \ > td->td_kstack_pages * PAGE_SIZE - \ > (char *)&td; \ > } while (0) > _______________________________________________ > freebsd-hackers@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-hackers > To unsubscribe, send any mail to "freebsd-hackers-unsubscribe@freebsd.org" I think that should be MI for us anyway. I'm not aware of any architectures FreeBSD supports with stacks that grow up. I'll give it a test on PPC. -Nathan
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