diff options
| author | Hoan Tran <Hoan@os.amperecomputing.com> | 2018-11-07 19:40:58 +0000 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2018-11-21 16:28:00 +0000 |
| commit | cbb72a3c19eff0ea3ccb0b068eca189063c86174 (patch) | |
| tree | 81ca26892c6ba72b7c56b00ebe03c4431973629f /drivers/perf/arm_spe_pmu.c | |
| parent | 472dc9fa7cc0769321d91b55eed4e21e2ab86632 (diff) | |
drivers/perf: xgene: Add CPU hotplug support
If the CPU assigned to the xgene PMU is taken offline, then subsequent
perf invocations on the PMU will fail:
# echo 0 > /sys/devices/system/cpu/cpu0/online
# perf stat -a -e l3c0/cycle-count/,l3c0/write/ sleep 1
Error:
The sys_perf_event_open() syscall returned with 19 (No such device) for event (l3c0/cycle-count/).
/bin/dmesg may provide additional information.
No CONFIG_PERF_EVENTS=y kernel support configured?
This patch implements a hotplug notifier in the xgene PMU driver so that
the PMU context is migrated to another online CPU should its assigned
CPU disappear.
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Hoan Tran <hoan.tran@amperecomputing.com>
[will: Made naming of new cpuhp_state enum entry consistent]
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'drivers/perf/arm_spe_pmu.c')
0 files changed, 0 insertions, 0 deletions