[RFC][PATCH 0/15] sched: Fix scheduling for multi-node processors

From: Andreas Herrmann
Date: Thu Aug 20 2009 - 09:13:13 EST

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Hi,

Subsequent patches adapt scheduling code to support multi-node processors.

In short, the required changes need to fulfill two requirements:

(1) The set of CPUs in a NUMA node does not necessarily span CPUs of entire
sockets anymore. (Current code assumes that.)

(2) The additional hierarchy in the CPU topology (i.e. internal node) might
be useful when doing load balancing when power saving matters.

Patches 1-7 (add basic) support fo a new scheduling domain (called MN for multi-node)
Patch 8 adds a knob to control power_savings balancing for MN domain
Patches 9, 10 add the snippets to do the power_savings balancing for MN domain
Patch 11 adds a way to pass unlimited __cpu_power information to upper domain levels
Patch 12 allows NODE domain to be parent of MC domain (and thus child of MN domain)
Patch 13 detects whether NODE domain is parent of MC instead of CPU domain
Patch 14 fixes perf policy scheduling when NODE domain is parent of MC domain
Patch 15 fixes cpu_coregroup_mask to use mask of core_siblings instead of node_siblings
(I admit that this change should better be added to my topology patches.)

To apply the patches you need to use tip/master as of today
(containing the sched cleanup patches) plus the 8 topology patches
that I have sent recently. (See
http://marc.info/?l=linux-kernel&m=124964980507887)

Full power saving scheduling options on multi-node processors are only
available with CONFIG_SCHED_MN=y. See example and example output
below.

Regards,

Andreas

PS: I send this as RFC. It seems to be pretty stable, though. But I
want to do some more testing before I'd ask to apply this to
tip-tree and I also want to check the performance impact of the
new sched domain level.

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Examples:
=========
(1) To demonstrate power_savings balancing I provide top output when system
is partially loaded.

(Note: sched_mc_power_savings=sched_mn_power_savings=0)

# for i in `seq 1 6`; do nbench& done

top - 15:41:08 up 7 min, 3 users, load average: 2.49, 0.64, 0.21
Tasks: 267 total, 7 running, 260 sleeping, 0 stopped, 0 zombie
Cpu0 : 49.7%us, 0.0%sy, 0.0%ni, 50.3%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu1 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu2 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu3 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu4 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu5 :100.0%us, 0.0%sy, 0.0%ni, 0.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu6 : 50.2%us, 0.0%sy, 0.0%ni, 49.8%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu7 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu8 :100.0%us, 0.0%sy, 0.0%ni, 0.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu9 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu10 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu11 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu12 : 48.8%us, 0.0%sy, 0.0%ni, 51.2%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu13 :100.0%us, 0.0%sy, 0.0%ni, 0.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu14 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu15 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu16 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu17 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu18 : 50.8%us, 0.0%sy, 0.0%ni, 49.2%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu19 :100.0%us, 0.0%sy, 0.0%ni, 0.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu20 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu21 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu22 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu23 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st

# echo 1 >> /sys/devices/system/cpu/sched_mn_power_savings

top - 15:42:27 up 8 min, 3 users, load average: 3.91, 1.49, 0.54
Tasks: 267 total, 7 running, 260 sleeping, 0 stopped, 0 zombie
Cpu0 : 0.0%us, 0.3%sy, 0.0%ni, 99.7%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu1 :100.0%us, 0.0%sy, 0.0%ni, 0.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu2 :100.0%us, 0.0%sy, 0.0%ni, 0.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu3 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu4 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu5 :100.0%us, 0.0%sy, 0.0%ni, 0.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu6 :100.0%us, 0.0%sy, 0.0%ni, 0.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu7 :100.0%us, 0.0%sy, 0.0%ni, 0.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu8 :100.0%us, 0.0%sy, 0.0%ni, 0.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu9 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu10 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu11 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu12 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu13 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu14 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu15 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu16 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu17 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu18 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu19 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu20 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu21 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu22 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu23 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st

# echo 2 >> /sys/devices/system/cpu/sched_mc_power_savings

top - 15:43:09 up 9 min, 3 users, load average: 4.93, 2.06, 0.77
Tasks: 267 total, 7 running, 260 sleeping, 0 stopped, 0 zombie
Cpu0 : 99.0%us, 0.0%sy, 0.0%ni, 1.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu1 :100.0%us, 0.0%sy, 0.0%ni, 0.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu2 :100.0%us, 0.0%sy, 0.0%ni, 0.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu3 :100.0%us, 0.0%sy, 0.0%ni, 0.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu4 :100.0%us, 0.0%sy, 0.0%ni, 0.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu5 :100.0%us, 0.0%sy, 0.0%ni, 0.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu6 : 0.7%us, 0.0%sy, 0.0%ni, 99.3%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu7 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu8 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu9 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu10 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu11 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu12 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu13 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu14 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu15 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu16 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu17 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu18 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu19 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu20 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu21 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu22 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu23 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st

# echo 0 >> /sys/devices/system/cpu/sched_mc_power_savings
# echo 0 >> /sys/devices/system/cpu/sched_mn_power_savings

top - 15:44:22 up 10 min, 3 users, load average: 5.38, 2.86, 1.15
Tasks: 267 total, 7 running, 260 sleeping, 0 stopped, 0 zombie
Cpu0 : 49.2%us, 0.3%sy, 0.0%ni, 50.5%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu1 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu2 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu3 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu4 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu5 :100.0%us, 0.0%sy, 0.0%ni, 0.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu6 : 50.8%us, 0.0%sy, 0.0%ni, 49.2%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu7 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu8 :100.0%us, 0.0%sy, 0.0%ni, 0.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu9 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu10 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu11 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu12 : 49.2%us, 0.0%sy, 0.0%ni, 50.8%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu13 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu14 :100.0%us, 0.0%sy, 0.0%ni, 0.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu15 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu16 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu17 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu18 : 50.7%us, 0.0%sy, 0.0%ni, 49.3%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu19 :100.0%us, 0.0%sy, 0.0%ni, 0.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu20 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu21 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu22 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu23 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st

--------------------------------------------------------------------------------
(2) To illustrate the new domain hierarchy I give examples for sched
domains and groups of CPU 23 of my test system:

CONFIG_SCHED_MN=n
sched_mc_power_savings=0

CPU23 attaching sched-domain:
domain 0: span 18-23 level MC
groups: 23 18 19 20 21 22
domain 1: span 18-23 level NODE
groups: 18-23 (__cpu_power = 6144)
domain 2: span 0-23 level CPU
groups: 18-23 0-5 6-11 12-17

CONFIG_SCHED_MN=n
sched_mc_power_savings=2

CPU23 attaching sched-domain:
domain 0: span 18-23 level MC
groups: 23 18 19 20 21 22
domain 1: span 18-23 level NODE
groups: 18-23 (__cpu_power = 6144)
domain 2: span 0-23 level CPU
groups: 18-23 (__cpu_power = 6144) 0-5 (__cpu_power = 6144) 6-11 (__cpu_power = 6144) 12-17 (__cpu_power = 6144)

CONFIG_SCHED_MN=y, CONFIG_NUMA=y
sched_mc_power_savings=0, sched_mn_power_savings=0

CPU23 attaching sched-domain:
domain 0: span 18-23 level MC
groups: 23 18 19 20 21 22
domain 1: span 18-23 level NODE
groups: 18-23 (__cpu_power = 6144)
domain 2: span 12-23 level MN
groups: 18-23 12-17
domain 3: span 0-23 level CPU
groups: 12-23 0-11

CONFIG_SCHED_MN=y, CONFIG_NUMA=y
sched_mc_power_savings=0, sched_mn_power_savings=1

CPU23 attaching sched-domain:
domain 0: span 18-23 level MC
groups: 23 18 19 20 21 22
domain 1: span 18-23 level NODE
groups: 18-23 (__cpu_power = 6144)
domain 2: span 12-23 level MN
groups: 18-23 12-17
domain 3: span 0-23 level CPU
groups: 12-23 (__cpu_power = 12288) 0-11 (__cpu_power = 12288)

CONFIG_SCHED_MN=y, CONFIG_NUMA=y
sched_mc_power_savings=2, sched_mn_power_savings=0

CPU23 attaching sched-domain:
domain 0: span 18-23 level MC
groups: 23 18 19 20 21 22
domain 1: span 18-23 level NODE
groups: 18-23 (__cpu_power = 6144)
domain 2: span 12-23 level MN
groups: 18-23 (__cpu_power = 6144) 12-17 (__cpu_power = 6144)
domain 3: span 0-23 level CPU
groups: 12-23 (__cpu_power = 12288) 0-11 (__cpu_power = 12288)

CONFIG_SCHED_MN=y, CONFIG_NUMA=y, CONFIG_ACPI_NUMA=n
(and CONFIG_SCHED_MN=y, CONFIG_NUMA=n)
sched_mc_power_savings=0, sched_mn_power_savings=0

CPU23 attaching sched-domain:
domain 0: span 18-23 level MC
groups: 23 18 19 20 21 22
domain 1: span 12-23 level MN
groups: 18-23 12-17
domain 2: span 0-23 level CPU
groups: 12-23 0-11

CONFIG_SCHED_MN=y, CONFIG_NUMA=y, CONFIG_ACPI_NUMA=n
(and CONFIG_SCHED_MN=y, CONFIG_NUMA=n)
sched_mc_power_savings=0, sched_mn_power_savings=1

CPU23 attaching sched-domain:
domain 0: span 18-23 level MC
groups: 23 18 19 20 21 22
domain 1: span 12-23 level MN
groups: 18-23 12-17
domain 2: span 0-23 level CPU
groups: 12-23 (__cpu_power = 12288) 0-11 (__cpu_power = 12288)

CONFIG_SCHED_MN=y, CONFIG_NUMA=y, CONFIG_ACPI_NUMA=n
(and CONFIG_SCHED_MN=y, CONFIG_NUMA=n)
sched_mc_power_savings=2, sched_mn_power_savings=0

CPU23 attaching sched-domain:
domain 0: span 18-23 level MC
groups: 23 18 19 20 21 22
domain 1: span 12-23 level MN
groups: 18-23 (__cpu_power = 6144) 12-17 (__cpu_power = 6144)
domain 2: span 0-23 level CPU
groups: 12-23 (__cpu_power = 12288) 0-11 (__cpu_power = 12288)

--------------------------------------------------------------------------------
(3) Further information -- just for completeness.

With NUMA support and SRAT detection the kernel uses following NUMA
information:

# numactl --hardware
available: 4 nodes (0-3)
node 0 cpus: 0 1 2 3 4 5
node 0 size: 2047 MB
node 0 free: 1761 MB
node 1 cpus: 6 7 8 9 10 11
node 1 size: 2046 MB
node 1 free: 1990 MB
node 2 cpus: 18 19 20 21 22 23
node 2 size: 2048 MB
node 2 free: 2004 MB
node 3 cpus: 12 13 14 15 16 17
node 3 size: 2048 MB
node 3 free: 2002 MB
node distances:
node 0 1 2 3
0: 10 16 16 16
1: 16 10 16 16
2: 16 16 10 16
3: 16 16 16 10

Without ACPI SRAT support (e.g. CONFIG_ACPI_NUMA=n) the NUMA
information is:

# numactl --hardware
available: 1 nodes (0-0)
node 0 cpus: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
node 0 size: 8189 MB
node 0 free: 7900 MB
node distances:
node 0
0: 10

--------------------------------------------------------------------------------
FINI

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