Date: Sun, 13 Oct 2013 11:59:27 -0400 From: George Neville-Neil <gnn@freebsd.org> To: Pedro Giffuni <pfg@freebsd.org> Cc: dtrace@FreeBSD.org Subject: Re: Dtrace providers wanted list Message-ID: <9455846D-2301-4055-9AA1-99177F21A3AC@freebsd.org> In-Reply-To: <6A4B05EA-D9C7-4014-BF86-4676EF01071C@FreeBSD.org> References: <52546385.2050203@FreeBSD.org> <20131010042544.GB65451@raichu> <52596B73.2050702@FreeBSD.org> <6A4B05EA-D9C7-4014-BF86-4676EF01071C@FreeBSD.org>
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--Apple-Mail=_3D78A635-0546-401D-9A60-5092B35A94F9 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=windows-1252 On Oct 12, 2013, at 22:17 , Pedro Giffuni <pfg@freebsd.org> wrote: >=20 > Il giorno 12/ott/2013, alle ore 10:32, Pedro Giffuni <pfg@FreeBSD.org> = ha scritto: >=20 >> On 09.10.2013 23:25, Mark Johnston wrote: >>> On Tue, Oct 08, 2013 at 02:56:53PM -0500, Pedro Giffuni wrote: >>>> Hello; >>>>=20 >>>> Sometime ago I looked around the list of Oracle's DTrace providers. >>>>=20 >>>> https://wikis.oracle.com/display/DTrace/Providers >>>>=20 >>>> We absolutely want them and although extremely useful as it is, = DTrace >>>> won't be complete until we have them all ;). For the time being we >>>> should probably focus on getting the really critical ones though. >>>>=20 >>>> The first in the list that we don't have that I think is critical = is >>>> mentioned in Brendan Gregg's FreeBSD specific blog post: >>>>=20 >>>> = http://dtrace.org/blogs/brendan/2013/09/25/the-use-method-freebsd-performa= nce-checklist/ >>>>=20 >>>> "Tracing paging is tricker until the vminfo provider is added; you = could >>>> try tracing from swap_pager_putpages() and swap_pager_getpages(), = but I >>>> didn=92t see an easy way to walk back to a thread struct; another = approach >>>> may be via vm_fault_hold(). Good luck. ..." >>=20 >> I started looking at this but it is somewhat more work than expected: >> Solaris has a specific vminfo interface in sysinfo.h. It looks very = handy >> for providing general vm statistics but our vm is different and I am >> not sure we want to go into implementing such interface. It depends >> on a VM guru, anyways. >>=20 >> OTOH, I found the fsinfo provider: >>=20 >> = https://bitbucket.org/illumos/illumos-gate/commits/5b50c2dcfdf948c4e4f0b88= 0eb76210067e7af7c >>=20 >> Our VFS does have some similarity so this may be easier/doable, plus >> it may be needed by the scsi and ZFS providers. >=20 > Ugh =85 >=20 > I looked at this one too, and similarly to the vminfo provider, there = is a vopstats > structure in vnode.h that we don't have. >=20 > Both the vopstats and vminfo structures are used to support Solaris' = kstat(1M) utility. > In other words, this is an in kernel system made to report statistics. = While it > seems natural to use them for DTrace in Solaris, we would have to = reimplement > it in some way if we want to have equivalent providers in FreeBSD. :-( >=20 > I am afraid that the CPC Provider may have similar issues but I = haven't looked at it. >=20 The CPC provider can be hooked to hwpmc, but one thing I note in the = Illumos provider is that they preface things with PAPI (which is actually its own = package, though the Illumos folks seem to have just snagged the name and don't use the actual = library). Best, George --Apple-Mail=_3D78A635-0546-401D-9A60-5092B35A94F9 Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename=signature.asc Content-Type: application/pgp-signature; name=signature.asc Content-Description: Message signed with OpenPGP using GPGMail -----BEGIN PGP SIGNATURE----- Comment: GPGTools - http://gpgtools.org iEYEARECAAYFAlJaw18ACgkQYdh2wUQKM9L5rwCgigRPXQjoWxJez9URo/jR1EII A/cAn2Y8EP0AqSlgenr+kdpmkDWpgcCO =YfXU -----END PGP SIGNATURE----- --Apple-Mail=_3D78A635-0546-401D-9A60-5092B35A94F9--
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