linux-kernel - Re: [PATCH v9 3/5] drm/panthor: Expose size of driver internal BO's over fdinfo

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Message-ID: <20250124094830.12c17b93@collabora.com>
Date: Fri, 24 Jan 2025 09:48:30 +0100
From: Boris Brezillon <boris.brezillon@...labora.com>
To: Adrián Larumbe <adrian.larumbe@...labora.com>
Cc: David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, Maxime Ripard
 <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, Jonathan
 Corbet <corbet@....net>, Steven Price <steven.price@....com>, Liviu Dudau
 <liviu.dudau@....com>, kernel@...labora.com, Tvrtko Ursulin
 <tursulin@...ulin.net>, Tvrtko Ursulin <tvrtko.ursulin@...lia.com>,
 dri-devel@...ts.freedesktop.org, linux-doc@...r.kernel.org,
 linux-kernel@...r.kernel.org, Mihail Atanassov <mihail.atanassov@....com>
Subject: Re: [PATCH v9 3/5] drm/panthor: Expose size of driver internal BO's
 over fdinfo

On Thu, 23 Jan 2025 22:53:00 +0000
Adrián Larumbe <adrian.larumbe@...labora.com> wrote:

> +/**
> + * panthor_vm_heaps_sizes() - Calculate size of all heap chunks across all
> + * heaps over all the heap pools in a VM
> + * @pfile: File.
> + * @stats: Memory stats to be updated.
> + *
> + * Calculate all heap chunk sizes in all heap pools bound to a VM. If the VM
> + * is active, record the size as active as well.
> + */
> +void panthor_vm_heaps_sizes(struct panthor_file *pfile, struct drm_memory_stats *stats)
> +{
> +	struct panthor_vm *vm;
> +	unsigned long i;
> +
> +	if (!pfile->vms)
> +		return;
> +
> +	xa_lock(&pfile->vms->xa);
> +	xa_for_each(&pfile->vms->xa, i, vm) {
> +		size_t size;
> +
> +		mutex_lock(&vm->heaps.lock);
> +		if (!vm->heaps.pool) {
> +			mutex_unlock(&vm->heaps.lock);
> +			continue;
> +		}
> +		size = panthor_heap_pool_size(vm->heaps.pool);
> +		mutex_unlock(&vm->heaps.lock);

Let's keep the locking scheme simple:

		size_t size = 0;

		mutex_lock(&vm->heaps.lock);
		if (vm->heaps.pool)
			size = panthor_heap_pool_size(vm->heaps.pool);
		mutex_unlock(&vm->heaps.lock);

		stats->resident += size;
		if (vm->as.id >= 0)
			stats->active += size;
		
> +
> +		stats->resident += size;
> +		if (vm->as.id >= 0)
> +			stats->active += size;
> +	}
> +	xa_unlock(&pfile->vms->xa);
> +}
> +