From: Arnaldo Carvalho de Melo <acme@kernel.org>
To: Stephane Eranian <eranian@google.com>
Cc: linux-kernel@vger.kernel.org, peterz@infradead.org,
acme@redhat.com, jolsa@redhat.com, kim.phillips@amd.com,
namhyung@kernel.org, irogers@google.com
Subject: Re: [PATCH v1 11/13] perf tools: improve IBS error handling
Date: Mon, 13 Sep 2021 16:34:24 -0300 [thread overview]
Message-ID: <YT+nwP3jrzgxEdmu@kernel.org> (raw)
In-Reply-To: <20210909075700.4025355-12-eranian@google.com>
Em Thu, Sep 09, 2021 at 12:56:58AM -0700, Stephane Eranian escreveu:
> From: Kim Phillips <kim.phillips@amd.com>
>
> This patch improves the error message returned on failed perf_event_open() on
> AMD when using IBS.
>
> Signed-off-by: Kim Phillips <kim.phillips@amd.com>
> ---
> tools/perf/util/evsel.c | 42 +++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 42 insertions(+)
>
> diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
> index f61e5dd53f5d..f203f178fdb9 100644
> --- a/tools/perf/util/evsel.c
> +++ b/tools/perf/util/evsel.c
> @@ -2684,12 +2684,52 @@ static bool find_process(const char *name)
> return ret ? false : true;
> }
>
> +static bool is_amd;
> +
> +static char *fgrep(FILE *inf, const char *str)
> +{
> + char line[256];
> + int slen = strlen(str);
> +
> + while (!feof(inf)) {
> + if (!fgets(line, 256, inf))
> + break;
> + if (strncmp(line, str, slen))
> + continue;
> +
> + return strdup(line);
> + }
> +
> + return NULL;
> +}
> +
> +static void detect_amd(void)
> +{
> + FILE *inf = fopen("/proc/cpuinfo", "r");
> + char *res;
> +
> + if (!inf)
> + return;
> +
> + res = fgrep(inf, "vendor_id");
> +
> + if (res) {
> + char *s = strchr(res, ':');
> +
> + is_amd = s && !strcmp(s, ": AuthenticAMD\n");
> + free(res);
> + }
> + fclose(inf);
> +}
> +
We have perf_env for such details, for instance in
tools/perf/util/sample-raw.c we have:o
const char *arch_pf = perf_env__arch(evlist->env);
const char *cpuid = perf_env__cpuid(evlist->env);
else if (arch_pf && !strcmp("x86", arch_pf) &&
cpuid && strstarts(cpuid, "AuthenticAMD") &&
evlist__has_amd_ibs(evlist)) {
> int evsel__open_strerror(struct evsel *evsel, struct target *target,
> int err, char *msg, size_t size)
> {
> char sbuf[STRERR_BUFSIZE];
> int printed = 0, enforced = 0;
>
> + detect_amd();
> +
> switch (err) {
> case EPERM:
> case EACCES:
> @@ -2782,6 +2822,8 @@ int evsel__open_strerror(struct evsel *evsel, struct target *target,
> return scnprintf(msg, size, "wrong clockid (%d).", clockid);
> if (perf_missing_features.aux_output)
> return scnprintf(msg, size, "The 'aux_output' feature is not supported, update the kernel.");
> + if (is_amd && (evsel->core.attr.precise_ip || !strncmp(evsel->pmu_name, "ibs", 3)) && (evsel->core.attr.exclude_kernel))
> + return scnprintf(msg, size, "AMD IBS can't exclude kernel events. Try running at a higher privilege level.");
> break;
> case ENODATA:
> return scnprintf(msg, size, "Cannot collect data source with the load latency event alone. "
> --
> 2.33.0.153.gba50c8fa24-goog
--
- Arnaldo
next prev parent reply other threads:[~2021-09-13 19:34 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-09 7:56 [PATCH v1 00/13] perf/x86/amd: Add AMD Fam19h Branch Sampling support Stephane Eranian
2021-09-09 7:56 ` [PATCH v1 01/13] perf/core: add union to struct perf_branch_entry Stephane Eranian
2021-09-09 19:03 ` Peter Zijlstra
2021-09-10 12:09 ` Michael Ellerman
2021-09-10 14:16 ` Michael Ellerman
2021-09-15 6:03 ` Stephane Eranian
2021-09-17 6:37 ` Madhavan Srinivasan
2021-09-17 6:48 ` Stephane Eranian
2021-09-17 7:05 ` Michael Ellerman
2021-09-17 7:39 ` Stephane Eranian
2021-09-17 12:38 ` Michael Ellerman
2021-09-17 16:42 ` Stephane Eranian
2021-09-19 10:27 ` Michael Ellerman
2021-09-09 7:56 ` [PATCH v1 02/13] x86/cpufeatures: add AMD Fam19h Branch Sampling feature Stephane Eranian
2021-09-09 7:56 ` [PATCH v1 03/13] perf/x86/amd: add AMD Fam19h Branch Sampling support Stephane Eranian
2021-09-09 10:44 ` kernel test robot
2021-09-09 15:33 ` kernel test robot
2021-09-09 7:56 ` [PATCH v1 04/13] perf/x86/amd: add branch-brs helper event for Fam19h BRS Stephane Eranian
2021-09-09 7:56 ` [PATCH v1 05/13] perf/x86/amd: enable branch sampling priv level filtering Stephane Eranian
2021-09-09 7:56 ` [PATCH v1 06/13] perf/x86/amd: add AMD branch sampling period adjustment Stephane Eranian
2021-09-09 7:56 ` [PATCH v1 07/13] perf/core: add idle hooks Stephane Eranian
2021-09-09 9:15 ` Peter Zijlstra
2021-09-09 10:42 ` kernel test robot
2021-09-09 11:02 ` kernel test robot
2021-09-09 7:56 ` [PATCH v1 08/13] perf/x86/core: " Stephane Eranian
2021-09-09 9:16 ` Peter Zijlstra
2021-09-09 7:56 ` [PATCH v1 09/13] perf/x86/amd: add idle hooks for branch sampling Stephane Eranian
2021-09-09 9:20 ` Peter Zijlstra
2021-09-09 7:56 ` [PATCH v1 10/13] perf tools: add branch-brs as a new event Stephane Eranian
2021-09-09 7:56 ` [PATCH v1 11/13] perf tools: improve IBS error handling Stephane Eranian
2021-09-13 19:34 ` Arnaldo Carvalho de Melo [this message]
2021-10-04 21:57 ` Kim Phillips
2021-10-04 23:44 ` Arnaldo Carvalho de Melo
2021-09-09 7:56 ` [PATCH v1 12/13] perf tools: improve error handling of AMD Branch Sampling Stephane Eranian
2021-10-04 21:57 ` Kim Phillips
2021-09-09 7:57 ` [PATCH v1 13/13] perf report: add addr_from/addr_to sort dimensions Stephane Eranian
2021-09-09 8:55 ` [PATCH v1 00/13] perf/x86/amd: Add AMD Fam19h Branch Sampling support Peter Zijlstra
2021-09-15 5:55 ` Stephane Eranian
2021-09-15 9:04 ` Peter Zijlstra
2021-10-28 18:30 ` Stephane Eranian
2021-09-27 20:17 ` Song Liu
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=YT+nwP3jrzgxEdmu@kernel.org \
--to=acme@kernel.org \
--cc=acme@redhat.com \
--cc=eranian@google.com \
--cc=irogers@google.com \
--cc=jolsa@redhat.com \
--cc=kim.phillips@amd.com \
--cc=linux-kernel@vger.kernel.org \
--cc=namhyung@kernel.org \
--cc=peterz@infradead.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).