[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Message-ID: <20220726074758.46686-1-yangyicong@huawei.com>
Date: Tue, 26 Jul 2022 15:47:56 +0800
From: Yicong Yang <yangyicong@...wei.com>
To: <peterz@...radead.org>, <mingo@...hat.com>,
<juri.lelli@...hat.com>, <vincent.guittot@...aro.org>,
<tim.c.chen@...ux.intel.com>, <gautham.shenoy@....com>,
<linux-kernel@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>
CC: <dietmar.eggemann@....com>, <rostedt@...dmis.org>,
<bsegall@...gle.com>, <bristot@...hat.com>,
<prime.zeng@...wei.com>, <yangyicong@...ilicon.com>,
<jonathan.cameron@...wei.com>, <ego@...ux.vnet.ibm.com>,
<srikar@...ux.vnet.ibm.com>, <linuxarm@...wei.com>,
<21cnbao@...il.com>, <guodong.xu@...aro.org>,
<hesham.almatary@...wei.com>, <john.garry@...wei.com>,
<shenyang39@...wei.com>, <kprateek.nayak@....com>,
<yu.c.chen@...el.com>, <wuyun.abel@...edance.com>
Subject: [PATCH v6 0/2] sched/fair: Scan cluster before scanning LLC in wake-up path
From: Yicong Yang <yangyicong@...ilicon.com>
This is the follow-up work to support cluster scheduler. Previously
we have added cluster level in the scheduler for both ARM64[1] and
X86[2] to support load balance between clusters to bring more memory
bandwidth and decrease cache contention. This patchset, on the other
hand, takes care of wake-up path by giving CPUs within the same cluster
a try before scanning the whole LLC to benefit those tasks communicating
with each other.
[1] 778c558f49a2 ("sched: Add cluster scheduler level in core and related Kconfig for ARM64")
[2] 66558b730f25 ("sched: Add cluster scheduler level for x86")
Change since v5:
- Improve patch 2 according to Peter's suggestion:
- use sched_cluster_active to indicate whether cluster is active
- consider SMT case and use wrap iteration when scanning cluster
- Add Vincent's tag
Thanks.
Link: https://lore.kernel.org/lkml/20220720081150.22167-1-yangyicong@hisilicon.com/
Change since v4:
- rename cpus_share_resources to cpus_share_lowest_cache to be more informative, per Tim
- return -1 when nr==0 in scan_cluster(), per Abel
Thanks!
Link: https://lore.kernel.org/lkml/20220609120622.47724-1-yangyicong@hisilicon.com/
Change since v3:
- fix compile error when !CONFIG_SCHED_CLUSTER, reported by lkp test.
Link: https://lore.kernel.org/lkml/20220608095758.60504-1-yangyicong@hisilicon.com/
Change since v2:
- leverage SIS_PROP to suspend redundant scanning when LLC is overloaded
- remove the ping-pong suppression
- address the comment from Tim, thanks.
Link: https://lore.kernel.org/lkml/20220126080947.4529-1-yangyicong@hisilicon.com/
Change since v1:
- regain the performance data based on v5.17-rc1
- rename cpus_share_cluster to cpus_share_resources per Vincent and Gautham, thanks!
Link: https://lore.kernel.org/lkml/20211215041149.73171-1-yangyicong@hisilicon.com/
Barry Song (2):
sched: Add per_cpu cluster domain info and cpus_share_lowest_cache API
sched/fair: Scan cluster before scanning LLC in wake-up path
include/linux/sched/sd_flags.h | 7 +++++++
include/linux/sched/topology.h | 8 +++++++-
kernel/sched/core.c | 12 ++++++++++++
kernel/sched/fair.c | 31 ++++++++++++++++++++++++++++---
kernel/sched/sched.h | 4 ++++
kernel/sched/topology.c | 25 +++++++++++++++++++++++++
6 files changed, 83 insertions(+), 4 deletions(-)
--
2.24.0
Powered by blists - more mailing lists