Support OOM priority for memcg. Changelog: * rename CONFIG_MEMCG_QOS to CONFIG_MEMCG_OOM_PRIORITY * move CONFIG_MEMCG_OOM_PRIORITY to init/Kconfig * set CONFIG_MEMCG_OOM_PRIORITY default from y to n, and enbale it in openeuler_defconfig * add rcu_read_lock() protection for mem_cgroup_from_task() * Instead of static key, use variable to check if the feature is enabled * use READ_ONCE/WRITE_ONCE protection when read/write oom_prio * cleanup Jing Xiangfeng (3): memcg: support priority for oom memcg: Add sysctl memcg_qos_enable memcg: enable CONFIG_MEMCG_OOM_PRIORITY by default arch/arm64/configs/openeuler_defconfig | 1 + arch/x86/configs/openeuler_defconfig | 1 + include/linux/memcontrol.h | 26 +++ init/Kconfig | 14 ++ mm/memcontrol.c | 229 +++++++++++++++++++++++++ mm/oom_kill.c | 61 ++++++- 6 files changed, 327 insertions(+), 5 deletions(-) -- 2.25.1