On Sun, Sep 09, 2018 at 01:44:31AM +0300, Alexey Skidanov wrote:
> The heap statistics have been removed and currently even basics statistics
> are missing.
>
> This patch creates per heap debugfs directory /sys/kernel/debug/<heap_name>
> and adds two counters - the number of allocated buffers and number of
> allocated bytes.
Why? What can we do with this information?
>
> Signed-off-by: Alexey Skidanov <alexey.skida...@intel.com>
> ---
> drivers/staging/android/ion/ion.c | 40
> +++++++++++++++++++++++++++++++--------
> drivers/staging/android/ion/ion.h | 3 ++-
> 2 files changed, 34 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/staging/android/ion/ion.c
> b/drivers/staging/android/ion/ion.c
> index 9907332..62335b9 100644
> --- a/drivers/staging/android/ion/ion.c
> +++ b/drivers/staging/android/ion/ion.c
> @@ -95,6 +95,9 @@ static struct ion_buffer *ion_buffer_create(struct ion_heap
> *heap,
> goto err1;
> }
>
> + heap->num_of_buffers++;
> + heap->num_of_alloc_bytes += len;
> +
> INIT_LIST_HEAD(&buffer->attachments);
> mutex_init(&buffer->lock);
> mutex_lock(&dev->buffer_lock);
> @@ -528,6 +531,8 @@ void ion_device_add_heap(struct ion_heap *heap)
> {
> struct ion_device *dev = internal_dev;
> int ret;
> + struct dentry *heap_root;
> + char debug_name[64];
>
> if (!heap->ops->allocate || !heap->ops->free)
> pr_err("%s: can not add heap with invalid ops struct.\n",
> @@ -546,6 +551,33 @@ void ion_device_add_heap(struct ion_heap *heap)
> }
>
> heap->dev = dev;
> + heap->num_of_buffers = 0;
> + heap->num_of_alloc_bytes = 0;
> +
> + /* Create heap root directory. If creation is failed, we may continue */
> + heap_root = debugfs_create_dir(heap->name, dev->debug_root);
> + if (!IS_ERR_OR_NULL(heap_root)) {
Close, but no, never check the return value here. Just keep on moving,
and call further debugfs calls. No need even for a comment here.
> + debugfs_create_u64("num_of_buffers",
> + 0444, heap_root,
> + &heap->num_of_buffers);
> + debugfs_create_u64("num_of_alloc_bytes",
> + 0444,
> + heap_root,
> + &heap->num_of_alloc_bytes);
> +
> + if (heap->shrinker.count_objects &&
> + heap->shrinker.scan_objects) {
> + snprintf(debug_name, 64, "%s_shrink", heap->name);
> + debugfs_create_file(debug_name,
> + 0644,
> + heap_root,
> + heap,
> + &debug_shrink_fops);
> + }
> + } else {
> + pr_err("%s: Failed to create heap dir in debugfs\n", __func__);
No need to print anything.
> + }
> +
> down_write(&dev->lock);
> heap->id = heap_id++;
> /*
> @@ -555,14 +587,6 @@ void ion_device_add_heap(struct ion_heap *heap)
> plist_node_init(&heap->node, -heap->id);
> plist_add(&heap->node, &dev->heaps);
>
> - if (heap->shrinker.count_objects && heap->shrinker.scan_objects) {
> - char debug_name[64];
> -
> - snprintf(debug_name, 64, "%s_shrink", heap->name);
> - debugfs_create_file(debug_name, 0644, dev->debug_root,
> - heap, &debug_shrink_fops);
> - }
You just moved the location of these debugfs files, right? What
userspace tool just broke when you did that? :)
thanks,
greg k-h
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