linux-kernel - [PATCH 2/3] drm/msm: Convert shrinker msgs to tracepoints

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Message-Id: <20200901154200.2451899-3-robdclark@gmail.com>
Date:   Tue,  1 Sep 2020 08:41:55 -0700
From:   Rob Clark <robdclark@...il.com>
To:     dri-devel@...ts.freedesktop.org
Cc:     Rob Clark <robdclark@...omium.org>,
        Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        linux-arm-msm@...r.kernel.org (open list:DRM DRIVER FOR MSM ADRENO GPU),
        freedreno@...ts.freedesktop.org (open list:DRM DRIVER FOR MSM ADRENO
        GPU), linux-kernel@...r.kernel.org (open list)
Subject: [PATCH 2/3] drm/msm: Convert shrinker msgs to tracepoints

From: Rob Clark <robdclark@...omium.org>

This reduces the spam in dmesg when we start hitting the shrinker, and
replaces it with something we can put on a timeline while profiling or
debugging system issues.

Signed-off-by: Rob Clark <robdclark@...omium.org>
---
 drivers/gpu/drm/msm/msm_gem_shrinker.c |  5 +++--
 drivers/gpu/drm/msm/msm_gpu_trace.h    | 26 ++++++++++++++++++++++++++
 2 files changed, 29 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/msm/msm_gem_shrinker.c b/drivers/gpu/drm/msm/msm_gem_shrinker.c
index 722d61668a97..482576d7a39a 100644
--- a/drivers/gpu/drm/msm/msm_gem_shrinker.c
+++ b/drivers/gpu/drm/msm/msm_gem_shrinker.c
@@ -6,6 +6,7 @@
 
 #include "msm_drv.h"
 #include "msm_gem.h"
+#include "msm_gpu_trace.h"
 
 static bool msm_gem_shrinker_lock(struct drm_device *dev, bool *unlock)
 {
@@ -87,7 +88,7 @@ msm_gem_shrinker_scan(struct shrinker *shrinker, struct shrink_control *sc)
 		mutex_unlock(&dev->struct_mutex);
 
 	if (freed > 0)
-		pr_info_ratelimited("Purging %lu bytes\n", freed << PAGE_SHIFT);
+		trace_msm_gem_purge(freed << PAGE_SHIFT);
 
 	return freed;
 }
@@ -123,7 +124,7 @@ msm_gem_shrinker_vmap(struct notifier_block *nb, unsigned long event, void *ptr)
 	*(unsigned long *)ptr += unmapped;
 
 	if (unmapped > 0)
-		pr_info_ratelimited("Purging %u vmaps\n", unmapped);
+		trace_msm_gem_purge_vmaps(unmapped);
 
 	return NOTIFY_DONE;
 }
diff --git a/drivers/gpu/drm/msm/msm_gpu_trace.h b/drivers/gpu/drm/msm/msm_gpu_trace.h
index 07572ab179fa..1079fe551279 100644
--- a/drivers/gpu/drm/msm/msm_gpu_trace.h
+++ b/drivers/gpu/drm/msm/msm_gpu_trace.h
@@ -114,6 +114,32 @@ TRACE_EVENT(msm_gmu_freq_change,
 		TP_printk("freq=%u, perf_index=%u", __entry->freq, __entry->perf_index)
 );
 
+
+TRACE_EVENT(msm_gem_purge,
+		TP_PROTO(u32 bytes),
+		TP_ARGS(bytes),
+		TP_STRUCT__entry(
+			__field(u32, bytes)
+			),
+		TP_fast_assign(
+			__entry->bytes = bytes;
+			),
+		TP_printk("Purging %u bytes", __entry->bytes)
+);
+
+
+TRACE_EVENT(msm_gem_purge_vmaps,
+		TP_PROTO(u32 unmapped),
+		TP_ARGS(unmapped),
+		TP_STRUCT__entry(
+			__field(u32, unmapped)
+			),
+		TP_fast_assign(
+			__entry->unmapped = unmapped;
+			),
+		TP_printk("Purging %u vmaps", __entry->unmapped)
+);
+
 #endif
 
 #undef TRACE_INCLUDE_PATH
-- 
2.26.2