Hi All,
I am trying to query the performance management counters on my box, which is
based on Kernel 2.6.38 and running Intel processor. I am trying to do the
same from my kernel module itself as I need to profile my kernel modules. I
use the perf_event_create_kernel_counter() api with the following attr/config
The below attrs/configuration is working and I am getting the counter
values/overflow_handler is getting called.
static struct perf_event_attr counter_attrs[] = {
{
{
.type = PERF_TYPE_HARDWARE,
.config = PERF_COUNT_HW_CACHE_MISSES,
.size = sizeof(struct perf_event_attr),
.pinned = 1,
.disabled = 0,
},
};
But, when I use the following attrs/config, the
perf_event_create_kernel_counter() API is failing. Ie, (IS_ERR
(returned_pevent) is TRUE and the event is not triggered on the CPU. I even
used “PERF_TYPE_HARDWARE” type also with the below config.
static struct perf_event_attr counter_attrs[] = {
{
.type = PERF_TYPE_HW_CACHE,
.config = PERF_COUNT_HW_CACHE_L1D <<
0 |
(PERF_COUNT_HW_CACHE_OP_READ << 8) |
(PERF_COUNT_HW_CACHE_RESULT_MISS << 16),
.size = sizeof(struct perf_event_attr),
.pinned = 1,
.disabled = 0,
},
};
Does anybody know why?. What “config” value I should use to query the L1D/
L1I cache misses. I think the “PERF_COUNT_HW_CACHE_MISSES” counts only 2nd and
3rd level caches.
Thanks,
Suja
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