Changelog v4->v5:
v4:
http://lore.kernel.org/lkml/20200727053230.19753-1-sri...@linux.vnet.ibm.com/t/#u
Changelog v4 ->v5:
powerpc/smp: Optimize start_secondary
Retain cache domain, no need for generalization
(Michael Ellerman, Peter Zijlstra,
Valentin Schneider, Gautham R. Shenoy)
powerpc/numa: Detect support for coregroup
Updated commit msg with current abstract nature of the coregroups
(Michael Ellerman)
powerpc/smp: Allocate cpumask only after searching thread group
Updated commit msg on why cpumask need not be freed.
(Michael Ellerman)
powerpc/smp: Create coregroup domain
Updated commit msg to specify actual implementation of
cpu_to_coregroup_id is in a subsequent patch (Michael Ellerman)
Changelog v3 ->v4:
v3:
https://lore.kernel.org/lkml/20200723085116.4731-1-sri...@linux.vnet.ibm.com/t/#u
powerpc/smp: Create coregroup domain
if coregroup_support doesn't exist, update MC mask to the next
smaller domain mask.
Changelog v2 -> v3:
v2:
https://lore.kernel.org/linuxppc-dev/20200721113814.32284-1-sri...@linux.vnet.ibm.com/t/#u
powerpc/smp: Cache node for reuse
Removed node caching part. Rewrote the Commit msg (Michael Ellerman)
Renamed to powerpc/smp: Fix a warning under !NEED_MULTIPLE_NODES
powerpc/smp: Enable small core scheduling sooner
Rewrote changelog (Gautham)
Renamed to powerpc/smp: Move topology fixups into a new function
powerpc/smp: Create coregroup domain
Add optimization for mask updation under coregroup_support
Changelog v1 -> v2:
v1:
https://lore.kernel.org/linuxppc-dev/20200714043624.5648-1-sri...@linux.vnet.ibm.com/t/#u
powerpc/smp: Merge Power9 topology with Power topology
Replaced a reference to cpu_smt_mask with per_cpu(cpu_sibling_map, cpu)
since cpu_smt_mask is only defined under CONFIG_SCHED_SMT
powerpc/smp: Enable small core scheduling sooner
Restored the previous info msg (Jordan)
Moved big core topology fixup to fixup_topology (Gautham)
powerpc/smp: Dont assume l2-cache to be superset of sibling
Set cpumask after verifying l2-cache. (Gautham)
powerpc/smp: Generalize 2nd sched domain
Moved shared_cache topology fixup to fixup_topology (Gautham)
Powerpc/numa: Detect support for coregroup
Explained Coregroup in commit msg (Michael Ellerman)
Powerpc/smp: Create coregroup domain
Moved coregroup topology fixup to fixup_topology (Gautham)
powerpc/smp: Implement cpu_to_coregroup_id
Move coregroup_enabled before getting associativity (Gautham)
powerpc/smp: Provide an ability to disable coregroup
Patch dropped (Michael Ellerman)
Cleanup of existing powerpc topologies and add coregroup support on
Powerpc. Coregroup is a group of (subset of) cores of a DIE that share
a resource.
Patch 7 of this patch series: "Powerpc/numa: Detect support for coregroup"
depends on
https://lore.kernel.org/linuxppc-dev/20200707140644.7241-1-sri...@linux.vnet.ibm.com/t/#u
However it should be easy to rebase the patch without the above patch.
This patch series is based on top of current powerpc/next tree + the
above patch.
Summary of some of the testing done with coregroup patchset.
It includes ebizzy, schbench, perf bench sched pipe and topology verification.
One the left side are results from powerpc/next tree and on the right are the
results with the patchset applied. Topological verification clearly shows that
there is no change in topology with and without the patches on all the 3 class
of systems that were tested.
On PowerPc/NextOn
Powerpc/next + Coregroup Support v5 patchset
Power 9 PowerNV (2 Node/ 160 Cpu System)
-
ebizzy (Throughput of 100 iterations of 30 seconds higher throughput is better)
N Min MaxMedian AvgStddev N
Min MaxMedian Avg Stddev
100 993884 1276090 1173476 1165914 54867.201100
910470 1279820 1171095 116209167363.28
schbench (latency hence lower is better)
Latency percentiles (usec) Latency
percentiles (usec)
50.0th: 455
50.0th: 454
75.0th: 533
75.0th: 543
90.0th: 683
90.0th: 701
95.0th: 743
95.0th: 737
*99.0th: 815
*99.0th: 805
99.5th: 839
99.5th: 835
99.9th: 913
