From: Mel Gorman <mgorman@techsingularity.net>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@kernel.org>,
Vincent Guittot <vincent.guittot@linaro.org>,
Valentin Schneider <valentin.schneider@arm.com>,
Aubrey Li <aubrey.li@linux.intel.com>,
Barry Song <song.bao.hua@hisilicon.com>,
Mike Galbraith <efault@gmx.de>,
Srikar Dronamraju <srikar@linux.vnet.ibm.com>,
LKML <linux-kernel@vger.kernel.org>,
Mel Gorman <mgorman@techsingularity.net>
Subject: [PATCH 0/2] Adjust NUMA imbalance for multiple LLCs
Date: Thu, 25 Nov 2021 15:19:39 +0000 [thread overview]
Message-ID: <20211125151941.8710-1-mgorman@techsingularity.net> (raw)
Commit 7d2b5dd0bcc4 ("sched/numa: Allow a floating imbalance between NUMA
nodes") allowed an imbalance between NUMA nodes such that communicating
tasks would not be pulled apart by the load balancer. This works fine when
there is a 1:1 relationship between LLC and node but can be suboptimal
for multiple LLCs if independent tasks prematurely use CPUs sharing cache.
The series addresses two problems -- inconsistent use of scheduler domain
weights and sub-optimal performance when there are many LLCs per NUMA node.
include/linux/sched/topology.h | 1 +
kernel/sched/fair.c | 26 +++++++++++++++-----------
kernel/sched/topology.c | 24 ++++++++++++++++++++++++
3 files changed, 40 insertions(+), 11 deletions(-)
--
2.31.1
next reply other threads:[~2021-11-25 15:21 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-25 15:19 Mel Gorman [this message]
2021-11-25 15:19 ` [PATCH 1/2] sched/fair: Use weight of SD_NUMA domain in find_busiest_group Mel Gorman
2021-11-25 15:19 ` [PATCH 2/2] sched/fair: Adjust the allowed NUMA imbalance when SD_NUMA spans multiple LLCs Mel Gorman
2021-11-28 15:06 ` [sched/fair] b4d95a034c: phoronix-test-suite.tiobench.RandomWrite.64MB.8.mb_s -26.3% regression kernel test robot
2021-11-29 11:35 ` Mel Gorman
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