Hi Chris,
Thanks for the patch!
2017-05-12 Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>:
> Constructing the name takes the majority of the time for allocating a
> sync_file to wrap a fence, and the name is very rarely used (only via
> the sync_file status user interface). To reduce the impact on the common
> path (that of creating sync_file to pass around), defer the construction
> of the name until it is first used.
>
> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> Cc: Sumit Semwal <sumit.semwal@xxxxxxxxxx>
> Cc: Gustavo Padovan <gustavo@xxxxxxxxxxx>
> ---
> drivers/dma-buf/sync_file.c | 18 +++++++++++-------
> include/linux/sync_file.h | 2 +-
> 2 files changed, 12 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/dma-buf/sync_file.c b/drivers/dma-buf/sync_file.c
> index 2321035f6204..2cccfa834778 100644
> --- a/drivers/dma-buf/sync_file.c
> +++ b/drivers/dma-buf/sync_file.c
> @@ -82,11 +82,6 @@ struct sync_file *sync_file_create(struct dma_fence *fence)
>
> sync_file->fence = dma_fence_get(fence);
>
> - snprintf(sync_file->name, sizeof(sync_file->name), "%s-%s%llu-%d",
> - fence->ops->get_driver_name(fence),
> - fence->ops->get_timeline_name(fence), fence->context,
> - fence->seqno);
> -
> return sync_file;
> }
> EXPORT_SYMBOL(sync_file_create);
> @@ -268,7 +263,7 @@ static struct sync_file *sync_file_merge(const char *name, struct sync_file *a,
> goto err;
> }
>
> - strlcpy(sync_file->name, name, sizeof(sync_file->name));
> + strlcpy(sync_file->user_name, name, sizeof(sync_file->user_name));
> return sync_file;
>
> err:
> @@ -422,7 +417,16 @@ static long sync_file_ioctl_fence_info(struct sync_file *sync_file,
> }
>
> no_fences:
> - strlcpy(info.name, sync_file->name, sizeof(info.name));
> + if (!sync_file->user_name[0]) {
> + scnprintf(sync_file->user_name,
> + sizeof(sync_file->user_name),
> + "%s-%s%llu-%d",
> + sync_file->fence->ops->get_driver_name(sync_file->fence),
> + sync_file->fence->ops->get_timeline_name(sync_file->fence),
> + sync_file->fence->context,
> + sync_file->fence->seqno);
> + }
> + strlcpy(info.name, sync_file->user_name, sizeof(info.name));
> info.status = dma_fence_is_signaled(sync_file->fence);
> info.num_fences = num_fences;
>
> diff --git a/include/linux/sync_file.h b/include/linux/sync_file.h
> index 3e3ab84fc4cd..0cbeff29f510 100644
> --- a/include/linux/sync_file.h
> +++ b/include/linux/sync_file.h
> @@ -34,7 +34,7 @@
> struct sync_file {
> struct file *file;
> struct kref kref;
> - char name[32];
> + char user_name[32];
Looks good to me, but please re-spin it fixing the issue reported by the
test bot then I can apply it.
Gustavo
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