On Fri, Dec 13, 2019 at 07:06:01PM +0200, Ville Syrjälä wrote: > On Fri, Dec 13, 2019 at 03:54:33PM +0000, Chris Wilson wrote: > > Quoting Ville Syrjala (2019-12-13 15:28:23) > > > From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> > > > > > > Include dev_name() in the tracpoints so one can filter based on > > > the device. > > > > > > Example: > > > echo 'dev=="0000:00:02.0"' > events/i915/intel_cpu_fifo_underrun/filter > > > > > > TODO: maybe don't both specifying the field name always and just > > > make it 'dev' (or whatever) always? > > > TODO: add for other tracpoints too if this is deemed good enough > > > > > > Suggested-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> > > > Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> > > > --- > > > drivers/gpu/drm/i915/i915_trace.h | 96 +++++++++++++++++++++---------- > > > 1 file changed, 65 insertions(+), 31 deletions(-) > > > > > > diff --git a/drivers/gpu/drm/i915/i915_trace.h b/drivers/gpu/drm/i915/i915_trace.h > > > index 7ef7a1e1664c..8931b6756f44 100644 > > > --- a/drivers/gpu/drm/i915/i915_trace.h > > > +++ b/drivers/gpu/drm/i915/i915_trace.h > > > @@ -20,11 +20,18 @@ > > > > > > /* watermark/fifo updates */ > > > > > > +#define __dev_name_i915(field, i915) __string(field, dev_name((i915)->drm.dev)) > > > +#define __dev_name_crtc(field, crtc) __string(field, dev_name((crtc)->base.dev->dev)) > > > +#define __assign_dev_name_i915(field, i915) __assign_str(field, dev_name((i915)->drm.dev)) > > > +#define __assign_dev_name_crtc(field, crtc) __assign_str(field, dev_name((crtc)->base.dev->dev)) > > > +#define __get_dev_name(field) __get_str(field) > > > > Storing the string is quite expensive, I thought. Can we stash the i915 > > and stringify in the TP_printk? Or is stashing the string the secret for > > the dev== filter? > > Last time I stashed a pointer in there people complained that it can > disappear before being consumed and cause a very theoretical oops. > But I guess we could stash just the pci devfn and whatnot. I believe 'domain + bus + devfn' would amount to 4 bytes. The downside is that it'd be just an integer so we'd lose the dev=domain:bus:dev.fn syntax for the filter. Suppose I could try to implement a new filter type for it, but no guarantees that would get accepted. Seems a bit too pci specific for kernel/trace/. -- Ville Syrjälä Intel _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
