drm/i915: Add a tracepoint for the shrinker
Often it is very useful to know why we suddenly purge vast tracts of
memory and surprisingly up until now we didn't even have a tracepoint
for when we shrink our memory.
Note that there are slab_start/end tracepoints already, but those
don't cover the internal recursion when we directly call into our
shrinker code. Hence a separate tracepoint seems justified. Also note
that we don't really need a separate tracepoint for the actual amount
of pages freed since we already have an unbind tracpoint for that.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
[danvet: Add a note that there's also slab_start/end and why they're
insufficient.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/i915_gem_shrinker.c b/drivers/gpu/drm/i915/i915_gem_shrinker.c
index 858df2b..1b66e1d 100644
--- a/drivers/gpu/drm/i915/i915_gem_shrinker.c
+++ b/drivers/gpu/drm/i915/i915_gem_shrinker.c
@@ -85,6 +85,8 @@
}, *phase;
unsigned long count = 0;
+ trace_i915_gem_shrink(dev_priv, target, flags);
+
/*
* As we may completely rewrite the (un)bound list whilst unbinding
* (due to retiring requests) we have to strictly process only
diff --git a/drivers/gpu/drm/i915/i915_trace.h b/drivers/gpu/drm/i915/i915_trace.h
index d0993bc..04fe849 100644
--- a/drivers/gpu/drm/i915/i915_trace.h
+++ b/drivers/gpu/drm/i915/i915_trace.h
@@ -107,6 +107,26 @@
TP_printk("obj=%p, size=%u", __entry->obj, __entry->size)
);
+TRACE_EVENT(i915_gem_shrink,
+ TP_PROTO(struct drm_i915_private *i915, unsigned long target, unsigned flags),
+ TP_ARGS(i915, target, flags),
+
+ TP_STRUCT__entry(
+ __field(int, dev)
+ __field(unsigned long, target)
+ __field(unsigned, flags)
+ ),
+
+ TP_fast_assign(
+ __entry->dev = i915->dev->primary->index;
+ __entry->target = target;
+ __entry->flags = flags;
+ ),
+
+ TP_printk("dev=%d, target=%lu, flags=%x",
+ __entry->dev, __entry->target, __entry->flags)
+);
+
TRACE_EVENT(i915_vma_bind,
TP_PROTO(struct i915_vma *vma, unsigned flags),
TP_ARGS(vma, flags),