wayland-client stores up to MAX_FDS_OUT (28) outgoing fds and
then release them in batch later through close_fds.
While this is not a problem in normal situation, because the
app would also have a reference to the same buffers, this is
an issue when these buffers are released (eg: because the
swapchain creation failed).
In this situation wayland-client owns the last ref to these
buffers and prevent their deletion.
This is an issue with dEQP-VK.wsi.wayland.swapchain.simulate_oom.image_extent
because it creates swapchains in a fast loop with a failing allocator
to fail the swapchain creation.
Without this change, on a 16GB dGPU the test peaks at 95% VRAM / 60% GTT and
completes in 1.5 sec.
With this change, the max usage is 65% VRAM / 10% GTT and completes it
in 0.3 sec.
Reviewed-by: Sebastian Wick <sebastian.wick@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/27592>
Pierre-Eric Pelloux-Prayer
9a00a360ad