Date: Tue, 5 Jun 2012 17:49:38 +0300 From: Konstantin Belousov <kostikbel@gmail.com> To: Dag-Erling Sm??rgrav <des@des.no> Cc: arch@freebsd.org Subject: Re: KTR_SPAREx Message-ID: <20120605144938.GN85127@deviant.kiev.zoral.com.ua> In-Reply-To: <86pq9dvn33.fsf@ds4.des.no> References: <86bokyvtc2.fsf@ds4.des.no> <20120605143215.GL85127@deviant.kiev.zoral.com.ua> <86pq9dvn33.fsf@ds4.des.no>
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--CQDko/0aYvuiEzgn Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue, Jun 05, 2012 at 04:40:32PM +0200, Dag-Erling Sm??rgrav wrote: > Konstantin Belousov <kostikbel@gmail.com> writes: > > Moving all device drivers to KTR_DEV makes the KTR unusable for device > > driver debugging. When looking at the drm2 and gem traces, I do not want > > to see other devices tracepoints. Amount of data from GEM is huge, and > > obfuscating it with unrelated debugging recycles the ktr ring faster, a= side > > of making noise that cayses log to be meaningless. >=20 > We only have a limited number of KTR types - 32, to be precise. We > can't spare one for each driver, and there's no reason why *your* driver > (for any value of "you") should get its own while everybody else shares > KTR_DEV. I want to have only *my* driver trace points in the ring, by whatever means. Breaking it right now would mean that I cannot do any GEM debugging. >=20 > If you think KTR_DEV is too noisy, add sysctls to enable or disable > tracing on a per-device basis. It should be quite easy to generalize. So you are planning to break some useful, but possibly randomly-achieved functionality, and delegate the work to repair it to somebody else ? >=20 > (I still haven't gotten around to implementing a similar infrastructure > for network interfaces...) >=20 > DES > --=20 > Dag-Erling Sm??rgrav - des@des.no --CQDko/0aYvuiEzgn Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (FreeBSD) iEYEARECAAYFAk/OHIEACgkQC3+MBN1Mb4ipIwCeNnkTQuffMM3uGSnbZt2zY5pU rl0AoMUPQEGfFH93xKOOz/jGwcHZ5BIQ =gP0D -----END PGP SIGNATURE----- --CQDko/0aYvuiEzgn--
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