Hi, The goal of this feature is to solve an issue that was seen in our testing. After discussing on [1] I thought we could solve this problem with stalling the application thread after each vkQueueSubmit() call where a binary semaphore is signaled but I don't think it's a good option because of performance impacts on the application. Unfortunately there isn't a good way to reproduce this problem 100% because it essentially exposes a race between the application thread and the submission thread. I've uploaded tests in the Khronos repository to try to expose the issue. Thanks, [1] : https://lists.freedesktop.org/archives/dri-devel/2019-August/229188.html Lionel Landwerlin (2): drm/syncobj: add sideband payload drm/syncobj: add submit point query capability drivers/gpu/drm/drm_syncobj.c | 132 ++++++++++++++++++++++------------ include/drm/drm_syncobj.h | 9 +++ include/uapi/drm/drm.h | 5 +- 3 files changed, 100 insertions(+), 46 deletions(-) -- 2.23.0.rc1 _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
