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Subject[PATCH RFC 0/2] mm: kmem: optimize obj_cgroup pointer retrieval
Date
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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