Messages in this thread | | | From | Roman Gushchin <> | Subject | [PATCH RFC 0/2] mm: kmem: optimize obj_cgroup pointer retrieval | Date | Tue, 20 Dec 2022 10:27:43 -0800 |
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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
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