From: jim.cromie@gmail.com
To: "Ville Syrjälä" <ville.syrjala@linux.intel.com>
Cc: Jason Baron <jbaron@akamai.com>,
Jani Nikula <jani.nikula@linux.intel.com>,
Greg KH <gregkh@linuxfoundation.org>,
daniel.vetter@ffwll.ch, intel-gfx@lists.freedesktop.org,
linux@rasmusvillemoes.dk, linux-kernel@vger.kernel.org,
amd-gfx@lists.freedesktop.org, seanpaul@chromium.org,
dri-devel@lists.freedesktop.org, joe@perches.com,
intel-gvt-dev@lists.freedesktop.org
Subject: Re: [Intel-gfx] [PATCH v7 0/9] dyndbg: drm.debug adaptation
Date: Thu, 27 Oct 2022 13:55:39 -0600 [thread overview]
Message-ID: <CAJfuBxzpG+C1ARLs3c_znXECEU7Ldg8RhruLMUXA67w+DwcrOQ@mail.gmail.com> (raw)
In-Reply-To: <Y1qqurH/lG0u+3ky@intel.com>
On Thu, Oct 27, 2022 at 9:59 AM Ville Syrjälä
<ville.syrjala@linux.intel.com> wrote:
>
> On Thu, Oct 27, 2022 at 09:37:52AM -0600, jim.cromie@gmail.com wrote:
> > On Thu, Oct 27, 2022 at 9:08 AM Jason Baron <jbaron@akamai.com> wrote:
> > >
> > >
> > >
> > > On 10/21/22 05:18, Jani Nikula wrote:
> > > > On Thu, 20 Oct 2022, Ville Syrjälä <ville.syrjala@linux.intel.com> wrote:
> > > >> On Sat, Sep 24, 2022 at 03:02:34PM +0200, Greg KH wrote:
> > > >>> On Sun, Sep 11, 2022 at 11:28:43PM -0600, Jim Cromie wrote:
> > > >>>> hi Greg, Dan, Jason, DRM-folk,
> > > >>>>
> > > >>>> heres follow-up to V6:
> > > >>>> rebased on driver-core/driver-core-next for -v6 applied bits (thanks)
> > > >>>> rework drm_debug_enabled{_raw,_instrumented,} per Dan.
> > > >>>>
> > > >>>> It excludes:
> > > >>>> nouveau parts (immature)
> > > >>>> tracefs parts (I missed --to=Steve on v6)
> > > >>>> split _ddebug_site and de-duplicate experiment (way unready)
> > > >>>>
> > > >>>> IOW, its the remaining commits of V6 on which Dan gave his Reviewed-by.
> > > >>>>
> > > >>>> If these are good to apply, I'll rebase and repost the rest separately.
> > > >>>
> > > >>> All now queued up, thanks.
> > > >>
> > > >> This stuff broke i915 debugs. When I first load i915 no debug prints are
> > > >> produced. If I then go fiddle around in /sys/module/drm/parameters/debug
> > > >> the debug prints start to suddenly work.
> > > >
> > > > Wait what? I always assumed the default behaviour would stay the same,
> > > > which is usually how we roll. It's a regression in my books. We've got a
> > > > CI farm that's not very helpful in terms of dmesg logging right now
> > > > because of this.
> > > >
> > > > BR,
> > > > Jani.
> > > >
> > > >
> > >
> > > That doesn't sound good - so you are saying that prior to this change some
> > > of the drm debugs were default enabled. But now you have to manually enable
> > > them?
> > >
> > > Thanks,
> > >
> > > -Jason
> >
> >
> > Im just seeing this now.
> > Any new details ?
>
> No. We just disabled it as BROKEN for now. I was just today thinking
> about sending that patch out if no solutin is forthcoming soon since
> we need this working before 6.1 is released.
>
> Pretty sure you should see the problem immediately with any driver
> (at least if it's built as a module, didn't try builtin). Or at least
> can't think what would make i915 any more special.
>
So, I should note -
99% of my time & energy on this dyndbg + drm patchset
has been done using virtme,
so my world-view (and dev-hack-test env) has been smaller, simpler
maybe its been fatally simplistic.
ive just rebuilt v6.0 (before the trouble)
and run it thru my virtual home box,
I didnt see any unfamiliar drm-debug output
that I might have inadvertently altered somehow
I have some real HW I can put a reference kernel on,0
to look for the missing output, but its all gonna take some time,
esp to tighten up my dev-test-env
in the meantime, there is:
config DRM_USE_DYNAMIC_DEBUG
bool "use dynamic debug to implement drm.debug"
default y
depends on DRM
depends on DYNAMIC_DEBUG || DYNAMIC_DEBUG_CORE
depends on JUMP_LABEL
help
Use dynamic-debug to avoid drm_debug_enabled() runtime overheads.
Due to callsite counts in DRM drivers (~4k in amdgpu) and 56
bytes per callsite, the .data costs can be substantial, and
are therefore configurable.
Does changing the default fix things for i915 dmesg ?
or is the problem deeper ?
theres also this Makefile addition, which I might have oversimplified
CFLAGS-$(CONFIG_DRM_USE_DYNAMIC_DEBUG) += -DDYNAMIC_DEBUG_MODULE
next prev parent reply other threads:[~2022-10-27 19:56 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-12 5:28 [PATCH v7 0/9] dyndbg: drm.debug adaptation Jim Cromie
2022-09-12 5:28 ` [PATCH v7 1/9] drm_print: condense enum drm_debug_category Jim Cromie
2022-09-12 10:17 ` Jani Nikula
2022-09-13 15:57 ` jim.cromie
2022-09-12 5:28 ` [PATCH v7 2/9] drm: POC drm on dyndbg - use in core, 2 helpers, 3 drivers Jim Cromie
2022-09-12 10:29 ` Jani Nikula
2022-09-12 21:11 ` jim.cromie
2022-09-12 5:28 ` [PATCH v7 3/9] drm_print: interpose drm_*dbg with forwarding macros Jim Cromie
2022-09-12 5:28 ` [PATCH v7 4/9] drm_print: wrap drm_*_dbg in dyndbg descriptor factory macro Jim Cromie
2022-09-12 5:28 ` [PATCH v7 5/9] drm-print.h: include dyndbg header Jim Cromie
2022-09-12 5:28 ` [PATCH v7 6/9] drm-print: add drm_dbg_driver to improve namespace symmetry Jim Cromie
2022-09-12 5:28 ` [PATCH v7 7/9] drm_print: optimize drm_debug_enabled for jump-label Jim Cromie
2022-09-12 5:28 ` [PATCH v7 8/9] drm_print: prefer bare printk KERN_DEBUG on generic fn Jim Cromie
2022-09-12 5:28 ` [PATCH v7 9/9] drm_print: add _ddebug descriptor to drm_*dbg prototypes Jim Cromie
2022-09-24 13:02 ` [PATCH v7 0/9] dyndbg: drm.debug adaptation Greg KH
2022-10-20 16:09 ` Ville Syrjälä
2022-10-21 9:18 ` [Intel-gfx] " Jani Nikula
2022-10-27 15:08 ` Jason Baron
2022-10-27 15:37 ` jim.cromie
2022-10-27 15:58 ` Ville Syrjälä
2022-10-27 19:55 ` jim.cromie [this message]
2022-10-27 20:09 ` Ville Syrjälä
2022-10-30 14:42 ` jim.cromie
2022-10-31 13:07 ` Ville Syrjälä
2022-10-31 22:11 ` jim.cromie
2022-11-01 0:20 ` Jason Baron
2022-11-01 8:52 ` Ville Syrjälä
2022-11-01 13:09 ` jim.cromie
2022-11-11 22:17 ` [PATCH 0/7] DYNAMIC_DEBUG fixups for rc Jim Cromie
2022-11-11 22:17 ` [PATCH 1/7] drm: mark drm.debug-on-dyndbg as BROKEN for now Jim Cromie
2022-11-14 12:20 ` [Intel-gfx] " Ville Syrjälä
2022-11-17 6:29 ` Greg KH
2022-11-11 22:17 ` [PATCH 2/7] drm_print: fixup improve stale comment Jim Cromie
2022-11-11 22:17 ` [PATCH 3/7] test-dyndbg: fixup CLASSMAP usage error Jim Cromie
2022-11-11 22:17 ` [PATCH 4/7] test-dyndbg: show that DEBUG enables prdbgs at compiletime Jim Cromie
2022-11-11 22:17 ` [PATCH 5/7] dyndbg: fix readback value on LEVEL_NAMES interfaces Jim Cromie
2022-11-11 22:17 ` [PATCH 6/7] dyndbg: clone DECLARE_DYNDBG_CLASSMAP to REFERENCE_DYNDBG_CLASSMAP Jim Cromie
2022-11-11 22:17 ` [PATCH 7/7] dyndbg: replace classmap list with a vector Jim Cromie
2022-11-17 6:29 ` [PATCH 0/7] DYNAMIC_DEBUG fixups for rc Greg KH
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