Hi,
At this point. libpfm4 does not support AMD L3 PMU events. They should
be added shortly.
On Wed, Mar 6, 2024 at 3:40 PM Yunzhao Li via perfmon2-devel
<perfmon2-devel@lists.sourceforge.net> wrote:
>
> Hello,
>
> I am encountering an issue where the pfm_get_os_event_encoding() API could
> not find l3_misses or l3_accesses perf events by running the following simple
> code:
> ~$ pfm_test l3_misses 0
> pfm_test: cannot get encoding: event not found
> ~$ pfm_test cache-misses 0
> cache-misses event supported by libpfm
>
> ```
> #include <err.h>
> #include <inttypes.h>
> #include <perfmon/pfmlib.h>
> #include <stdlib.h>
> #include <string.h>
>
> int main(int argc, char **argv)
> {
> pfm_pmu_encode_arg_t arg;
> int ret;
> char *event_name;
> int os_encoding;
>
> if (argc != 3) {
> fprintf(stderr, "Usage: %s <event_name> <os_encoding>\n", argv[0]);
> return 1;
> }
>
> event_name =argv[1];
> os_encoding = atoi(argv[2]);
>
> ret = pfm_initialize();
> if (ret != PFM_SUCCESS)
> errx(1, "cannot initialize library %s", pfm_strerror(ret));
>
> memset(&arg, 0, sizeof(arg));
> char* fqstr = malloc(256);
> if (!fqstr) {
> errx(1, "Failed to allocate memory for fully qualified string");
> }
>
> arg.fstr = &fqstr;
> arg.size = sizeof(arg);
>
> ret = pfm_get_os_event_encoding(event_name, PFM_PLM0|PFM_PLM3,
> os_encoding, &arg);
> if (ret != PFM_SUCCESS)
> errx(1, "cannot get encoding: %s", pfm_strerror(ret));
> else
> printf("%s event supported by libpfm\n", event_name);
>
> free(fqstr);
> return 0;
> }
>
>
> However, these events can be successfully monitored using the perf CLI tool:
>
> ```
> ~$sudo perf stat -a -e l3_misses,l3_accesses -- sleep 1
>
> Performance counter stats for 'system wide':
>
> 1,122,395,814 l3_misses
> 4,398,985,531 l3_accesses
>
> 1.005054759 seconds time elapsed
> ```
> The environment is running on a kernel version 6.1 with an AMD EPYC 7642
> 48-Core Processor.
>
> Any suggestions?
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> perfmon2-devel@lists.sourceforge.net
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