Re: [PATCH 5/5] drm/i915: Implement fdinfo memory stats printing

From: "Iddamsetty, Aravind" <aravind.iddamsetty@intel.com>
To: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>,
	<Intel-gfx@lists.freedesktop.org>,
	<dri-devel@lists.freedesktop.org>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Subject: Re: [PATCH 5/5] drm/i915: Implement fdinfo memory stats printing
Date: Thu, 3 Aug 2023 10:45:38 +0530	[thread overview]
Message-ID: <fffae148-a609-4f1d-eae4-dbe253f43650@intel.com> (raw)
In-Reply-To: <20230727101352.1899466-6-tvrtko.ursulin@linux.intel.com>

On 27-07-2023 15:43, Tvrtko Ursulin wrote:
> From: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
> 
> Use the newly added drm_print_memory_stats helper to show memory
> utilisation of our objects in drm/driver specific fdinfo output.
> 
> To collect the stats we walk the per memory regions object lists
> and accumulate object size into the respective drm_memory_stats
> categories.
> 
> Objects with multiple possible placements are reported in multiple
> regions for total and shared sizes, while other categories are
> counted only for the currently active region.
> 
> Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
> Cc: Aravind Iddamsetty <aravind.iddamsetty@intel.com>
> Cc: Rob Clark <robdclark@gmail.com>> ---
>  drivers/gpu/drm/i915/i915_drm_client.c | 85 ++++++++++++++++++++++++++
>  1 file changed, 85 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/i915_drm_client.c b/drivers/gpu/drm/i915/i915_drm_client.c
> index a61356012df8..9e7a6075ee25 100644
> --- a/drivers/gpu/drm/i915/i915_drm_client.c
> +++ b/drivers/gpu/drm/i915/i915_drm_client.c
> @@ -45,6 +45,89 @@ void __i915_drm_client_free(struct kref *kref)
>  }
>  
>  #ifdef CONFIG_PROC_FS
> +static void
> +obj_meminfo(struct drm_i915_gem_object *obj,
> +	    struct drm_memory_stats stats[INTEL_REGION_UNKNOWN])
> +{
> +	struct intel_memory_region *mr;
> +	u64 sz = obj->base.size;
> +	enum intel_region_id id;
> +	unsigned int i;
> +
> +	/* Attribute size and shared to all possible memory regions. */
> +	for (i = 0; i < obj->mm.n_placements; i++) {
> +		mr = obj->mm.placements[i];
> +		id = mr->id;
> +
> +		if (obj->base.handle_count > 1)
> +			stats[id].shared += sz;
> +		else
> +			stats[id].private += sz;
> +	}
> +
> +	/* Attribute other categories to only the current region. */
> +	mr = obj->mm.region;
> +	if (mr)
> +		id = mr->id;
> +	else
> +		id = INTEL_REGION_SMEM;
> +
> +	if (!obj->mm.n_placements) {

I guess we do not expect to have n_placements set to public objects, is
that right?

Thanks,
Aravind.
> +		if (obj->base.handle_count > 1)
> +			stats[id].shared += sz;
> +		else
> +			stats[id].private += sz;
> +	}
> +
> +	if (i915_gem_object_has_pages(obj)) {
> +		stats[id].resident += sz;
> +
> +		if (!dma_resv_test_signaled(obj->base.resv,
> +					    dma_resv_usage_rw(true)))
> +			stats[id].active += sz;
> +		else if (i915_gem_object_is_shrinkable(obj) &&
> +			 obj->mm.madv == I915_MADV_DONTNEED)
> +			stats[id].purgeable += sz;
> +	}
> +}
> +
> +static void show_meminfo(struct drm_printer *p, struct drm_file *file)
> +{
> +	struct drm_memory_stats stats[INTEL_REGION_UNKNOWN] = {};
> +	struct drm_i915_file_private *fpriv = file->driver_priv;
> +	struct i915_drm_client *client = fpriv->client;
> +	struct drm_i915_private *i915 = fpriv->i915;
> +	struct drm_i915_gem_object *obj;
> +	struct intel_memory_region *mr;
> +	struct list_head *pos;
> +	unsigned int id;
> +
> +	/* Public objects. */
> +	spin_lock(&file->table_lock);
> +	idr_for_each_entry(&file->object_idr, obj, id)
> +		obj_meminfo(obj, stats);
> +	spin_unlock(&file->table_lock);
> +
> +	/* Internal objects. */
> +	rcu_read_lock();
> +	list_for_each_rcu(pos, &client->objects_list) {
> +		obj = i915_gem_object_get_rcu(list_entry(pos, typeof(*obj),
> +							 client_link));
> +		if (!obj)
> +			continue;
> +		obj_meminfo(obj, stats);
> +		i915_gem_object_put(obj);
> +	}
> +	rcu_read_unlock();
> +
> +	for_each_memory_region(mr, i915, id)
> +		drm_print_memory_stats(p,
> +				       &stats[id],
> +				       DRM_GEM_OBJECT_RESIDENT |
> +				       DRM_GEM_OBJECT_PURGEABLE,
> +				       mr->name);
> +}
> +
>  static const char * const uabi_class_names[] = {
>  	[I915_ENGINE_CLASS_RENDER] = "render",
>  	[I915_ENGINE_CLASS_COPY] = "copy",
> @@ -106,6 +189,8 @@ void i915_drm_client_fdinfo(struct drm_printer *p, struct drm_file *file)
>  	 * ******************************************************************
>  	 */
>  
> +	show_meminfo(p, file);
> +
>  	if (GRAPHICS_VER(i915) < 8)
>  		return;
>