From: Steven Rostedt <rostedt-nx8X9YLhiw1AfugRpC6u6w@public.gmane.org>
To: James Bottomley
<James.Bottomley-d9PhHud1JfjCXq6kfMZ53/egYHeGw8Jk@public.gmane.org>
Cc: Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
ksummit-discuss-cunTk1MwBs98uUxBSJOaYoYkZiVZrdSR2LY78lusg7I@public.gmane.org,
Carlos O'Donell <carlos-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
Shuah Khan <shuahkh-JPH+aEBZ4P+UEJcrhfAQsw@public.gmane.org>,
Thorsten Leemhuis <linux-rCxcAJFjeRkk+I/owrrOrA@public.gmane.org>,
linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [Ksummit-discuss] [MAINTAINERS SUMMIT] & [TECH TOPIC] Improve regression tracking
Date: Wed, 5 Jul 2017 10:56:51 -0400 [thread overview]
Message-ID: <20170705105651.5da9c969@gandalf.local.home> (raw)
In-Reply-To: <1499266228.3668.10.camel-d9PhHud1JfjCXq6kfMZ53/egYHeGw8Jk@public.gmane.org>
On Wed, 05 Jul 2017 07:50:28 -0700
James Bottomley <James.Bottomley-d9PhHud1JfjCXq6kfMZ53/egYHeGw8Jk@public.gmane.org> wrote:
> On Wed, 2017-07-05 at 10:36 -0400, Steven Rostedt wrote:
> > On Wed, 5 Jul 2017 15:33:41 +0100
> > Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org> wrote:
> >
> > >
> > > On Wed, Jul 05, 2017 at 04:06:07PM +0200, Greg KH wrote:
> > >
> > > >
> > > > I don't mean to poo-poo the idea, but please realize that around
> > > > 75% of the kernel is hardware/arch support, so that means that
> > > > 75% of the changes/fixes deal with hardware things (yes, change
> > > > is in direct correlation to size of the codebase in the tree,
> > > > strange but true).
> > >
> > > Then add in all the fixes for concurrency/locking issues and so on
> > > that're hard to reliably reproduce as well...
> >
> > All tests should be run with lockdep enabled ;-) Which a surprising
> > few developers appear to do :-p
>
> Lockdep checks the locking hierarchies and makes assumptions about them
> which it then validates ... it doesn't tell you if the data you think
We should probably look at adding infrastructure that helps in that.
RCU already has a lot of there to help know if data is being protected
by RCU or not.
Hmm, maybe we could add a __rcu like type that we can associate
protected data with, where a config can associate access to a variable
with a lock being held?
> you're protecting was accessed outside the lock, which is the usual
> source of concurrency problems. In other words lockdep is useful but
> it's not a panacea.
Still not an excuse to not have lockdep enabled during tests.
-- Steve
next prev parent reply other threads:[~2017-07-05 14:56 UTC|newest]
Thread overview: 71+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <576cea07-770a-4864-c3f5-0832ff211e94@leemhuis.info>
[not found] ` <576cea07-770a-4864-c3f5-0832ff211e94-rCxcAJFjeRkk+I/owrrOrA@public.gmane.org>
2017-07-03 16:30 ` [Ksummit-discuss] [MAINTAINERS SUMMIT] & [TECH TOPIC] Improve regression tracking Steven Rostedt
[not found] ` <20170703123025.7479702e-f9ZlEuEWxVcJvu8Pb33WZ0EMvNT87kid@public.gmane.org>
2017-07-03 18:50 ` Dan Williams
2017-07-04 19:03 ` Thorsten Leemhuis
[not found] ` <ad94dc65-cc9c-f4f1-27c1-5a48603c7f59-rCxcAJFjeRkk+I/owrrOrA@public.gmane.org>
2017-07-05 12:45 ` Steven Rostedt
[not found] ` <20170705084528.67499f8c-f9ZlEuEWxVcJvu8Pb33WZ0EMvNT87kid@public.gmane.org>
2017-07-05 13:09 ` Carlos O'Donell
[not found] ` <4080ecc7-1aa8-2940-f230-1b79d656cdb4-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2017-07-05 13:27 ` Steven Rostedt
[not found] ` <20170705092757.63dc2328-f9ZlEuEWxVcJvu8Pb33WZ0EMvNT87kid@public.gmane.org>
2017-07-05 14:06 ` Greg KH
[not found] ` <20170705140607.GA30187-U8xfFu+wG4EAvxtiuMwx3w@public.gmane.org>
2017-07-05 14:28 ` Carlos O'Donell
2017-07-05 14:33 ` Steven Rostedt
[not found] ` <20170705103335.0cbd9984-f9ZlEuEWxVcJvu8Pb33WZ0EMvNT87kid@public.gmane.org>
2017-07-05 14:52 ` Mark Brown
2017-07-05 15:08 ` Carlos O'Donell
[not found] ` <8c6843e8-73d9-a898-0366-0b72dfeb79a2-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2017-07-05 16:10 ` Steven Rostedt
[not found] ` <20170705121000.5430d7d0-f9ZlEuEWxVcJvu8Pb33WZ0EMvNT87kid@public.gmane.org>
2017-07-06 11:34 ` Laurent Pinchart
2017-07-09 13:46 ` Thorsten Leemhuis
2017-07-05 14:33 ` Mark Brown
[not found] ` <20170705143341.oees22k2snhtmkxo-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2017-07-05 14:36 ` Steven Rostedt
[not found] ` <20170705103658.226099c6-f9ZlEuEWxVcJvu8Pb33WZ0EMvNT87kid@public.gmane.org>
2017-07-05 14:50 ` James Bottomley
[not found] ` <1499266228.3668.10.camel-d9PhHud1JfjCXq6kfMZ53/egYHeGw8Jk@public.gmane.org>
2017-07-05 14:56 ` Steven Rostedt [this message]
[not found] ` <20170705105651.5da9c969-f9ZlEuEWxVcJvu8Pb33WZ0EMvNT87kid@public.gmane.org>
2017-07-05 15:09 ` James Bottomley
[not found] ` <1499267389.3668.16.camel-d9PhHud1JfjCXq6kfMZ53/egYHeGw8Jk@public.gmane.org>
2017-07-05 15:20 ` Mark Brown
[not found] ` <20170705152026.rkw73q2f6xmiju37-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2017-07-05 15:40 ` Geert Uytterhoeven
2017-07-05 15:20 ` Steven Rostedt
[not found] ` <20170705112047.23ee09f6-f9ZlEuEWxVcJvu8Pb33WZ0EMvNT87kid@public.gmane.org>
2017-07-05 15:32 ` James Bottomley
[not found] ` <1499268748.3668.20.camel-d9PhHud1JfjCXq6kfMZ53/egYHeGw8Jk@public.gmane.org>
2017-07-05 15:43 ` Steven Rostedt
2017-07-05 18:24 ` Daniel Vetter
2017-07-05 18:17 ` Daniel Vetter
2017-07-05 15:16 ` Guenter Roeck
[not found] ` <a462fb3b-a6d4-e969-b301-b404981de224-0h96xk9xTtrk1uMJSBkQmQ@public.gmane.org>
2017-07-05 15:27 ` Steven Rostedt
[not found] ` <20170705112707.54d7f345-f9ZlEuEWxVcJvu8Pb33WZ0EMvNT87kid@public.gmane.org>
2017-07-05 15:36 ` James Bottomley
[not found] ` <1499269015.3668.25.camel-d9PhHud1JfjCXq6kfMZ53/egYHeGw8Jk@public.gmane.org>
2017-07-05 16:04 ` Steven Rostedt
[not found] ` <20170705120459.41e81f7b-f9ZlEuEWxVcJvu8Pb33WZ0EMvNT87kid@public.gmane.org>
2017-07-05 16:58 ` James Bottomley
[not found] ` <1499273908.3668.30.camel-d9PhHud1JfjCXq6kfMZ53/egYHeGw8Jk@public.gmane.org>
2017-07-05 17:07 ` Steven Rostedt
2017-07-05 16:48 ` Guenter Roeck
[not found] ` <c782a15a-4e73-7373-ca66-5b55e9406059-0h96xk9xTtrk1uMJSBkQmQ@public.gmane.org>
2017-07-05 16:58 ` Dan Williams
2017-07-05 17:02 ` Steven Rostedt
[not found] ` <20170705130200.7c653f61-f9ZlEuEWxVcJvu8Pb33WZ0EMvNT87kid@public.gmane.org>
2017-07-06 9:28 ` Mark Brown
[not found] ` <20170706092836.ifcnc2qqwufndhdl-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2017-07-06 9:41 ` Daniel Vetter
[not found] ` <CAKMK7uFH+Kz8Mdph=J_FCZ4LC3tzoOmwNJPpSO+snTz6p0Xz+w-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-07-06 14:53 ` Theodore Ts'o
[not found] ` <20170706145346.6w2uzcf7xacbr3or-AKGzg7BKzIDYtjvyW6yDsg@public.gmane.org>
2017-07-06 21:28 ` Daniel Vetter
2017-07-06 14:48 ` James Bottomley
[not found] ` <1499352485.2765.14.camel-d9PhHud1JfjCXq6kfMZ53/egYHeGw8Jk@public.gmane.org>
2017-07-07 10:03 ` Mark Brown
2017-07-31 16:54 ` Eric W. Biederman
[not found] ` <87zibkzgve.fsf-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>
2017-07-31 20:11 ` Steven Rostedt
[not found] ` <20170731161123.4d1e80ac-f9ZlEuEWxVcJvu8Pb33WZ0EMvNT87kid@public.gmane.org>
2017-07-31 20:12 ` Eric W. Biederman
2017-08-02 16:53 ` Shuah Khan
[not found] ` <fb399eba-91eb-21a5-e3f5-c3f919061c12-JPH+aEBZ4P+UEJcrhfAQsw@public.gmane.org>
2017-08-02 17:33 ` Eric W. Biederman
[not found] ` <87lgn1nac8.fsf-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>
2017-08-02 17:46 ` Shuah Khan
[not found] ` <61093c3f-6ad0-c033-a524-f2624f8d55ba-JPH+aEBZ4P+UEJcrhfAQsw@public.gmane.org>
2017-08-02 17:58 ` Shuah Khan
2017-08-02 18:04 ` Eric W. Biederman
[not found] ` <87r2wtluc1.fsf-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>
2017-08-02 18:23 ` Randy Dunlap
2017-08-02 18:42 ` Shuah Khan
[not found] ` <92c31d6f-f98d-c764-eeec-bd0a2316d769-JPH+aEBZ4P+UEJcrhfAQsw@public.gmane.org>
2017-08-03 3:03 ` Theodore Ts'o
[not found] ` <20170803030327.gf7pl7foer3abdpe-AKGzg7BKzIDYtjvyW6yDsg@public.gmane.org>
2017-08-03 17:42 ` Bird, Timothy
[not found] ` <ECADFF3FD767C149AD96A924E7EA6EAF3AD01BAB-t8YLG9SB9XQEb75RT/aEbJZPSYnAH24X@public.gmane.org>
2017-08-03 22:11 ` Shuah Khan
2017-08-03 18:51 ` Shuah Khan
[not found] ` <a313d401-d18b-ed9a-d82d-f6e12f606743-JPH+aEBZ4P+UEJcrhfAQsw@public.gmane.org>
2017-08-04 1:15 ` Theodore Ts'o
2017-07-07 3:33 ` Fengguang Wu
[not found] ` <20170707033302.rgpq5knzx3qvvr2p-q6ZYBFIlbFFi0tQiZxhdj1DQ4js95KgL@public.gmane.org>
2017-07-07 4:52 ` Frank Rowand
2017-07-05 15:32 ` Greg KH
[not found] ` <20170705153259.GA7265-U8xfFu+wG4EAvxtiuMwx3w@public.gmane.org>
2017-07-05 15:36 ` Carlos O'Donell
2017-07-05 15:52 ` Steven Rostedt
[not found] ` <20170705115219.02370220-f9ZlEuEWxVcJvu8Pb33WZ0EMvNT87kid@public.gmane.org>
2017-07-05 18:42 ` Greg KH
2017-07-05 18:29 ` Daniel Vetter
2017-07-06 22:24 ` Shuah Khan
[not found] ` <a2fada39-76d4-e136-f2db-d8306d929902-JPH+aEBZ4P+UEJcrhfAQsw@public.gmane.org>
2017-07-06 22:32 ` Steven Rostedt
[not found] ` <20170706183249.60b2aef9-f9ZlEuEWxVcJvu8Pb33WZ0EMvNT87kid@public.gmane.org>
2017-07-06 22:40 ` Shuah Khan
2017-07-05 16:54 ` Dan Williams
[not found] ` <CAPcyv4iOV2-hndx1rQmpPQF+myp=P8rmpf5JhXQXZxPhR6qoQw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-07-05 18:45 ` Greg KH
[not found] ` <20170705184544.GB22044-U8xfFu+wG4EAvxtiuMwx3w@public.gmane.org>
2017-07-05 19:47 ` Dan Williams
2017-07-05 14:06 ` Carlos O'Donell
2017-07-05 15:47 ` Mark Brown
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