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| author | Anju T <anju@linux.vnet.ibm.com> | 2017-08-14 13:42:23 +0200 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2017-08-15 12:27:28 +0200 |
| commit | 7efbae90892b7858f1d4873d34ffffbeb460ed8b (patch) | |
| tree | 17a8f2d85893651afbd631deda60a2bda290a89d /arch/powerpc | |
| parent | powerpc/mm/nohash: Move definition of PGALLOC_GFP to fix build errors (diff) | |
| download | linux-7efbae90892b7858f1d4873d34ffffbeb460ed8b.tar.xz linux-7efbae90892b7858f1d4873d34ffffbeb460ed8b.zip | |
powerpc/perf/imc: Fix nest events on muti socket system
In a multi node system with discontiguous node ids, nest event values
are not showing up properly. eg. lscpu output:
NUMA node0 CPU(s): 0-15
NUMA node8 CPU(s): 16-31
Nest event values on such systems can be counted on CPUs <= 15:
$./perf stat -e 'nest_powerbus0_imc/PM_PB_CYC/' -C 0-14 -I 1000 sleep 1000
# time counts unit events
1.000294577 30,17,24,42,880 nest_powerbus0_imc/PM_PB_CYC/
But not on CPUs >= 16:
$./perf stat -e 'nest_powerbus0_imc/PM_PB_CYC/' -C 16-28 -I 1000 sleep 1000
# time counts unit events
1.000049902 <not supported> nest_powerbus0_imc/PM_PB_CYC/
This is because, when fetching the reference count, the node id (which
may be sparse) is used as the array index, not the node number (which
is 0 based and contiguous).
Fix it by using the node number as the array index.
$./perf stat -e 'nest_powerbus0_imc/PM_PB_CYC/' -C 16-28 -I 1000 sleep 1000
# time counts unit events
1.000241961 26,12,35,28,704 nest_powerbus0_imc/PM_PB_CYC/
Signed-off-by: Anju T Sudhakar <anju@linux.vnet.ibm.com>
[mpe: Change log tweaks for clarity and brevity]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc')
| -rw-r--r-- | arch/powerpc/perf/imc-pmu.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/powerpc/perf/imc-pmu.c b/arch/powerpc/perf/imc-pmu.c index 52017f6eafd9..a8f95f96d54b 100644 --- a/arch/powerpc/perf/imc-pmu.c +++ b/arch/powerpc/perf/imc-pmu.c @@ -1064,7 +1064,7 @@ static int init_nest_pmu_ref(void) */ for_each_possible_cpu(cpu) { nid = cpu_to_node(cpu); - for_each_online_node(i) { + for (i = 0; i < num_possible_nodes(); i++) { if (nest_imc_refc[i].id == nid) { per_cpu(local_nest_imc_refc, cpu) = &nest_imc_refc[i]; break; |