On 02/01/2025 19:44, Tvrtko Ursulin wrote:
From: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxxx>
A small set of drm_syncobj optimisations which should make things a tiny bit
more efficient on the CPU side of things.
/Maybe/ between 1-2% more FPS can be observed with "vkgears -present-mailbox" on
the Steam Deck Plasma desktop but I am reluctant to make a definitive claim. It
would be best if someone could verify or suggest a more heavy workload for
syncobjs.
Later I added two more patches to the series which add a fast path to
replace the kmalloc/kfree path for vast majority of invocations.
For example during Cyberpunk 2077 benchmark 96.7% lookups is for a
single syncobj, 3.2% for two, and nothing above 3. Syncobj wait
distribution is very similar.
With that and some kernel hardening options turned off it still seems
around 1.5% improvement for vkgears.
Regards,
Tvrtko
Less lines of source code and "Every little helps" (tm), right?
Tvrtko Ursulin (6):
drm/syncobj: Avoid double memset in drm_syncobj_find_fence
drm/syncobj: Remove unhelpful helper
drm/syncobj: Do not allocate an array to store zeros
drm/syncobj: Avoid one temporary allocation in drm_syncobj_array_find
drm/syncobj: Use put_user in drm_syncobj_query_ioctl
drm/syncobj: Avoid temporary allocation in
drm_syncobj_timeline_signal_ioctl
drivers/gpu/drm/drm_syncobj.c | 238 +++++++++++++++-------------------
1 file changed, 106 insertions(+), 132 deletions(-)
