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Message-Id: <20221220182745.1903540-1-roman.gushchin@linux.dev>
Date: Tue, 20 Dec 2022 10:27:43 -0800
From: Roman Gushchin <roman.gushchin@...ux.dev>
To: linux-mm@...ck.org
Cc: cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
Shakeel Butt <shakeelb@...gle.com>,
Johannes Weiner <hannes@...xchg.org>,
Michal Hocko <mhocko@...nel.org>,
Muchun Song <muchun.song@...ux.dev>,
Andrew Morton <akpm@...ux-foundation.org>,
Roman Gushchin <roman.gushchin@...ux.dev>
Subject: [PATCH RFC 0/2] mm: kmem: optimize obj_cgroup pointer retrieval
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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