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From: Jim Cromie <jim.cromie@gmail.com>
To: jbaron@akamai.com, gregkh@linuxfoundation.org,
	robdclark@gmail.com, sean@poorly.run, daniel.vetter@ffwll.ch,
	seanpaul@chromium.org, lyude@redhat.com,
	linux-kernel@vger.kernel.org, rostedt@goodmis.org,
	mathieu.desnoyers@efficios.com, dri-devel@lists.freedesktop.org,
	amd-gfx@lists.freedesktop.org,
	intel-gvt-dev@lists.freedesktop.org,
	intel-gfx@lists.freedesktop.org
Cc: quic_saipraka@quicinc.com, will@kernel.org,
	catalin.marinas@arm.com, quic_psodagud@quicinc.com,
	maz@kernel.org, arnd@arndb.de,
	linux-arm-kernel@lists.infradead.org,
	linux-arm-msm@vger.kernel.org, mingo@redhat.com,
	jim.cromie@gmail.com
Subject: [PATCH v10 07/10] drm_print: instrument drm_debug_enabled
Date: Thu, 11 Nov 2021 15:02:03 -0700	[thread overview]
Message-ID: <20211111220206.121610-8-jim.cromie@gmail.com> (raw)
In-Reply-To: <20211111220206.121610-1-jim.cromie@gmail.com>

Duplicate drm_debug_enabled() code into both "basic" and "dyndbg"
ifdef branches.  Then add a pr_debug("todo: ...") into the "dyndbg"
branch.

Then convert the "dyndbg" branch's code to a macro, so that the
pr_debug() get its callsite info from the invoking function, instead
of from drm_debug_enabled() itself.

This gives us unique callsite info for the 8 remaining users of
drm_debug_enabled(), and lets us enable them individually to see how
much logging traffic they generate.  The oft-visited callsites can
then be reviewed for runtime cost and possible optimizations.

Heres what we get:

bash-5.1# modprobe drm
dyndbg: 384 debug prints in module drm
bash-5.1# grep todo: /proc/dynamic_debug/control
drivers/gpu/drm/drm_edid.c:1843 [drm]connector_bad_edid =_ "todo: maybe avoid via dyndbg\012"
drivers/gpu/drm/drm_print.c:309 [drm]___drm_dbg =p "todo: maybe avoid via dyndbg\012"
drivers/gpu/drm/drm_print.c:286 [drm]__drm_dev_dbg =p "todo: maybe avoid via dyndbg\012"
drivers/gpu/drm/drm_vblank.c:1491 [drm]drm_vblank_restore =_ "todo: maybe avoid via dyndbg\012"
drivers/gpu/drm/drm_vblank.c:787 [drm]drm_crtc_vblank_helper_get_vblank_timestamp_internal =_ "todo: maybe avoid via dyndbg\012"
drivers/gpu/drm/drm_vblank.c:410 [drm]drm_crtc_accurate_vblank_count =_ "todo: maybe avoid via dyndbg\012"
drivers/gpu/drm/drm_atomic_uapi.c:1457 [drm]drm_mode_atomic_ioctl =_ "todo: maybe avoid via dyndbg\012"
drivers/gpu/drm/drm_edid_load.c:178 [drm]edid_load =_ "todo: maybe avoid via dyndbg\012"

At quick glance, edid won't qualify, drm_print might, drm_vblank is
strongest chance, maybe atomic-ioctl too.

Signed-off-by: Jim Cromie <jim.cromie@gmail.com>
---
 include/drm/drm_print.h | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/include/drm/drm_print.h b/include/drm/drm_print.h
index 392cff7cb95c..a902bd4d8c55 100644
--- a/include/drm/drm_print.h
+++ b/include/drm/drm_print.h
@@ -381,6 +381,11 @@ enum drm_debug_category {
 #define DRM_DBG_CAT_DP		DRM_UT_DP
 #define DRM_DBG_CAT_DRMRES	DRM_UT_DRMRES
 
+static inline bool drm_debug_enabled(enum drm_debug_category category)
+{
+	return unlikely(__drm_debug & category);
+}
+
 #else /* CONFIG_DRM_USE_DYNAMIC_DEBUG */
 
 /* join prefix + format in cpp so dyndbg can see it */
@@ -414,12 +419,13 @@ enum drm_debug_category {
 #define DRM_DBG_CAT_DP		"drm:dp: "
 #define DRM_DBG_CAT_DRMRES	"drm:res: "
 
-#endif /* CONFIG_DRM_USE_DYNAMIC_DEBUG */
+#define drm_debug_enabled(category)			\
+	({						\
+	pr_debug("todo: maybe avoid via dyndbg\n");	\
+	unlikely(__drm_debug & (category));		\
+	})
 
-static inline bool drm_debug_enabled(enum drm_debug_category category)
-{
-	return unlikely(__drm_debug & category);
-}
+#endif /* CONFIG_DRM_USE_DYNAMIC_DEBUG */
 
 /*
  * struct device based logging
@@ -582,7 +588,6 @@ void __drm_dev_dbg(const struct device *dev, enum drm_debug_category category,
 #define drm_dbg_drmres(drm, fmt, ...)					\
 	drm_dev_dbg((drm) ? (drm)->dev : NULL, DRM_DBG_CAT_DRMRES, fmt, ##__VA_ARGS__)
 
-
 /*
  * printk based logging
  *
-- 
2.31.1


  parent reply	other threads:[~2021-11-11 22:02 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-11 22:01 [PATCH v10 00/10 RESEND] use DYNAMIC_DEBUG to implement DRM.debug & DRM.trace Jim Cromie
2021-11-11 22:01 ` [PATCH v10 01/10] dyndbg: add DEFINE_DYNAMIC_DEBUG_BITGRPS macro and callbacks Jim Cromie
2021-11-11 22:01 ` [PATCH v10 02/10] drm: fix doc grammar Jim Cromie
2021-11-11 22:01 ` [PATCH v10 03/10] amdgpu: use dyndbg.BITGRPS to control existing pr_debugs Jim Cromie
2021-11-11 22:02 ` [PATCH v10 04/10] i915/gvt: trim spaces from pr_debug "gvt: core:" prefixes Jim Cromie
2021-11-11 22:02 ` [PATCH v10 05/10] i915/gvt: use dyndbg.BITGRPS for existing pr_debugs Jim Cromie
2021-11-11 22:02 ` [PATCH v10 06/10] drm_print: add choice to use dynamic debug in drm-debug Jim Cromie
2021-11-11 22:02 ` Jim Cromie [this message]
2021-11-11 22:02 ` [PATCH v10 08/10] dyndbg: add print-to-tracefs, selftest with it - RFC Jim Cromie
2021-11-12 11:49   ` Vincent Whitchurch
2021-11-12 15:08     ` Jason Baron
2021-11-12 17:07       ` Steven Rostedt
2021-11-12 17:32         ` Jason Baron
2021-11-12 17:54           ` Steven Rostedt
2021-11-16  8:46       ` Pekka Paalanen
2021-11-18 14:29         ` Jason Baron
2021-11-18 15:24           ` Pekka Paalanen
2021-11-19 16:21             ` Jason Baron
2021-11-19 22:46               ` jim.cromie
2021-11-19 22:54                 ` Steven Rostedt
2021-11-25 13:51                 ` Vincent Whitchurch
2021-11-22  9:02               ` Pekka Paalanen
2021-11-22 22:42                 ` jim.cromie
2021-11-23  8:45                   ` Pekka Paalanen
2021-11-23  9:32                     ` Simon Ser
2021-12-08  5:16     ` jim.cromie
2021-12-09 15:09       ` Vincent Whitchurch
2021-11-11 22:02 ` [PATCH v10 09/10] dyndbg: create DEFINE_DYNAMIC_DEBUG_LOG|TRACE_GROUPS Jim Cromie
2021-11-11 22:02 ` [PATCH v10 10/10] drm: use DEFINE_DYNAMIC_DEBUG_TRACE_GROUPS in 3 places Jim Cromie
  -- strict thread matches above, loose matches on Subject: below --
2021-11-05 19:26 [PATCH v10 00/10] use DYNAMIC_DEBUG to implement DRM.debug & DRM.trace Jim Cromie
2021-11-05 19:26 ` [PATCH v10 07/10] drm_print: instrument drm_debug_enabled Jim Cromie

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