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[v3,0/2] Add cpu hotplug support for powerpc/perf/hv-24x7

Message ID 20200626102824.270923-1-kjain@linux.ibm.com (mailing list archive)
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Series Add cpu hotplug support for powerpc/perf/hv-24x7 | expand

Message

kajoljain June 26, 2020, 10:28 a.m. UTC 
This patchset add cpu hotplug support for hv_24x7 driver by adding
online/offline cpu hotplug function. It also add sysfs file
"cpumask" to expose current online cpu that can be used for
hv_24x7 event count.

Changelog:
v2 -> v3
- Corrected some of the typo mistakes and update commit message
  as suggested by Gautham R Shenoy.
- Added Reviewed-by tag for the first patch in the patchset.

v1 -> v2
- Changed function to pick active cpu incase of offline
  from "cpumask_any_but" to "cpumask_last", as
  cpumask_any_but function pick very next online cpu and incase where
  we are sequentially off-lining multiple cpus, "pmu_migrate_context"
  can add extra latency.
  - Suggested by: Gautham R Shenoy.

- Change documentation for cpumask and rather then hardcode the
  initialization for cpumask_attr_group, add loop to get very first
  NULL as suggested by Gautham R Shenoy.

Kajol Jain (2):
  powerpc/perf/hv-24x7: Add cpu hotplug support
  powerpc/hv-24x7: Add sysfs files inside hv-24x7 device to show cpumask

 .../sysfs-bus-event_source-devices-hv_24x7    |  7 ++
 arch/powerpc/perf/hv-24x7.c                   | 79 ++++++++++++++++++-
 include/linux/cpuhotplug.h                    |  1 +
 3 files changed, 86 insertions(+), 1 deletion(-)