This patchset improves the performance of get_obj_cgroup_from_current(), which is used to get an objcg pointer on the kernel memory allocation fast path. Results (1M 8-bytes accounted allocations): | version | accounted (us) | delta | unaccounted (us) | delta | |-----------------+----------------+-------+------------------+--------| | baseline (6.1+) | 81042 | | 45269 | | | patch 1 | 78756 | -2.8% | 42731 | -5.6% | | patch 2 | 73650 | -9.1% | 30662 | -32.3% | Unaccounted allocations were performed from a user's task belonging to the root cgroup, so savings are particularly large because previously the root_mem_cgroup pointer was obtained first just to learn that it's corresponding objcg is NULL. Roman Gushchin (2): mm: kmem: optimize get_obj_cgroup_from_current() mm: kmem: add direct objcg pointer to task_struct include/linux/sched.h | 4 ++ mm/memcontrol.c | 102 ++++++++++++++++++++++++++++++++---------- 2 files changed, 83 insertions(+), 23 deletions(-) -- 2.39.0
