From: Piotr Luc <Piotr.Luc@xxxxxxxxx> The aim of the test is to stress i915 memory eviction mechanism on Android. It seems that Android systems, which usually don't have a swap file, experience some problems with killing offending processes that use a large amount of GFX memory. Linux systems seem to be more robust in this case and kill such processes because swap file allows to accept more memory requests, and also they are more distributed in time. However, Linux system with swap disabled behaves similar to Android. This test was developed to help replicate the OOM situation where system ends up with continuously repeated message: "Unable to purge GPU memory due lock contention." This state lasts long time, counted in minutes or hours, and Android systems seems to be unable to recover from it quickly, as it would be expected. I believe it could be treated as a kind of DoS attack caused by a malicious GFX application and need more investigation, thus this set of patches. The gem_exec_mem_huge test should be run with enabled low memory killer; the first patch adds a new parameter to prevent disabling LMK. Piotr Luc (2): lib/igt_core.c: Add new parameter to prevent disabling LMK tests/gem_exec_mem_huge.c: New test to stress eviction lib/igt_core.c | 15 +++- tests/Makefile.sources | 1 + tests/gem_exec_mem_huge.c | 196 ++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 210 insertions(+), 2 deletions(-) create mode 100644 tests/gem_exec_mem_huge.c -- 2.5.0 _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
