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higher memory usage and leak on Intel iris

System information

System:
  Host: voyager Kernel: 5.4.0-52-generic x86_64 bits: 64 compiler: gcc 
  v: 9.3.0 Desktop: Gnome 3.36.4 wm: gnome-shell dm: GDM3 
  Distro: Ubuntu 20.04.1 LTS (Focal Fossa) 
CPU:
  Topology: Dual Core model: Intel Core i5-5300U bits: 64 type: MT MCP 
  arch: Broadwell rev: 4 L2 cache: 3072 KiB 
  flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx 
  bogomips: 18358 
  Speed: 1891 MHz min/max: 500/2900 MHz Core speeds (MHz): 1: 1891 2: 1693 
  3: 1768 4: 1932 
Graphics:
  Device-1: Intel HD Graphics 5500 vendor: Lenovo driver: i915 v: kernel 
  bus ID: 00:02.0 chip ID: 8086:1616 
  Display: wayland server: X.Org 1.20.8 driver: modesetting 
  unloaded: fbdev,vesa compositor: gnome-shell resolution: 1366x768~60Hz 
  OpenGL: renderer: Mesa Intel HD Graphics 5500 (BDW GT2) v: 4.6 Mesa 20.0.8 
  direct render: Yes

Describe the issue

Running the weston-simple-egl demo in an Ubuntu 20.04 Wayland session takes more than 40MB RAM and increasing, while under the older i965 driver (i.e. running via MESA_LOADER_DRIVER_OVERRIDE=i965 weston-simple-egl) only 21MB RAM are consumed without a notable increase over time.

The same issue has been reported to weston: wayland/weston#412.

Regression

The memory consumption with i965 is much lower and stays flat.

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