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];
#ifdef CONFIG_DEBUG_FS
struct list_head sync_file_list;
#endif
--
2.11.0
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