From: Alexei Budankov <abudankov@huawei.com>
To: Jiri Olsa <jolsa@kernel.org>, Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: lkml <linux-kernel@vger.kernel.org>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Ingo Molnar <mingo@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Namhyung Kim <namhyung@kernel.org>,
"Alexander Shishkin" <alexander.shishkin@linux.intel.com>,
Michael Petlan <mpetlan@redhat.com>,
Ian Rogers <irogers@google.com>,
Stephane Eranian <eranian@google.com>
Subject: Re: [PATCH 2/3] perf tools: Allow to enable/disable events via control file
Date: Mon, 7 Dec 2020 20:02:20 +0300 [thread overview]
Message-ID: <7bcde520-e933-c2d6-c960-3f8acdaf6047@huawei.com> (raw)
In-Reply-To: <20201206170519.4010606-3-jolsa@kernel.org>
Hi,
On 06.12.2020 20:05, Jiri Olsa wrote:
> Adding new control events to enable/disable specific event.
> The interface string for control file are:
>
> 'enable-<EVENT NAME>'
> 'disable-<EVENT NAME>'
<SNIP>
>
> when received the command, perf will scan the current evlist
> for <EVENT NAME> and if found it's enabled/disabled.
<SNIP>
> diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
> index 70aff26612a9..05723227bebf 100644
> --- a/tools/perf/util/evlist.c
> +++ b/tools/perf/util/evlist.c
> @@ -1915,7 +1915,13 @@ static int evlist__ctlfd_recv(struct evlist *evlist, enum evlist_ctl_cmd *cmd,
> bytes_read == data_size ? "" : c == '\n' ? "\\n" : "\\0");
>
> if (bytes_read > 0) {
> - if (!strncmp(cmd_data, EVLIST_CTL_CMD_ENABLE_TAG,
> + if (!strncmp(cmd_data, EVLIST_CTL_CMD_ENABLE_EVSEL_TAG,
> + (sizeof(EVLIST_CTL_CMD_ENABLE_EVSEL_TAG)-1))) {
> + *cmd = EVLIST_CTL_CMD_ENABLE_EVSEL;
> + } else if (!strncmp(cmd_data, EVLIST_CTL_CMD_DISABLE_EVSEL_TAG,
> + (sizeof(EVLIST_CTL_CMD_DISABLE_EVSEL_TAG)-1))) {
> + *cmd = EVLIST_CTL_CMD_DISABLE_EVSEL;
> + } else if (!strncmp(cmd_data, EVLIST_CTL_CMD_ENABLE_TAG,
> (sizeof(EVLIST_CTL_CMD_ENABLE_TAG)-1))) {
> *cmd = EVLIST_CTL_CMD_ENABLE;
> } else if (!strncmp(cmd_data, EVLIST_CTL_CMD_DISABLE_TAG,
> @@ -1952,6 +1958,8 @@ int evlist__ctlfd_process(struct evlist *evlist, enum evlist_ctl_cmd *cmd)
> char cmd_data[EVLIST_CTL_CMD_MAX_LEN];
> int ctlfd_pos = evlist->ctl_fd.pos;
> struct pollfd *entries = evlist->core.pollfd.entries;
> + struct evsel *evsel;
> + char *evsel_name;
>
> if (!evlist__ctlfd_initialized(evlist) || !entries[ctlfd_pos].revents)
> return 0;
> @@ -1967,6 +1975,26 @@ int evlist__ctlfd_process(struct evlist *evlist, enum evlist_ctl_cmd *cmd)
> case EVLIST_CTL_CMD_DISABLE:
> evlist__disable(evlist);
> break;
> + case EVLIST_CTL_CMD_ENABLE_EVSEL:
> + evsel_name = cmd_data + sizeof(EVLIST_CTL_CMD_ENABLE_EVSEL_TAG) - 1;
It makes sense to check that evsel_name still points
into cmd_data buffer after assigning to event name.
Regards,
Alexei
next prev parent reply other threads:[~2020-12-07 17:03 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-06 17:05 [PATCH 0/3] perf tools: Allow to enable/disable events via control pipe Jiri Olsa
2020-12-06 17:05 ` [PATCH 1/3] perf tools: Add evlist__disable_evsel/evlist__enable_evsel Jiri Olsa
2020-12-07 17:12 ` Alexei Budankov
2020-12-06 17:05 ` [PATCH 2/3] perf tools: Allow to enable/disable events via control file Jiri Olsa
2020-12-07 17:02 ` Alexei Budankov [this message]
2020-12-10 16:24 ` Jiri Olsa
2020-12-10 17:15 ` Arnaldo Carvalho de Melo
2020-12-10 17:19 ` Arnaldo Carvalho de Melo
2020-12-10 17:26 ` [BUG] jevents problem when cross building " Arnaldo Carvalho de Melo
2020-12-10 17:44 ` John Garry
2020-12-10 18:17 ` Arnaldo Carvalho de Melo
2020-12-10 18:27 ` John Garry
2020-12-10 19:57 ` John Garry
2020-12-16 11:41 ` John Garry
2020-12-16 14:01 ` Arnaldo Carvalho de Melo
2020-12-10 18:06 ` Jiri Olsa
2020-12-10 18:20 ` Alexei Budankov
2020-12-10 18:27 ` Arnaldo Carvalho de Melo
2020-12-10 18:32 ` Alexei Budankov
2020-12-06 17:05 ` [PATCH 3/3] perf tools: Allow to list " Jiri Olsa
2020-12-07 16:28 ` Arnaldo Carvalho de Melo
2020-12-07 17:09 ` Alexei Budankov
2020-12-07 19:53 ` Jiri Olsa
2020-12-07 19:51 ` Jiri Olsa
2020-12-07 13:25 ` [PATCH 0/3] perf tools: Allow to enable/disable events via control pipe Namhyung Kim
2020-12-10 20:43 [PATCHv2 " Jiri Olsa
2020-12-10 20:43 ` [PATCH 2/3] perf tools: Allow to enable/disable events via control file Jiri Olsa
2020-12-15 15:14 ` Arnaldo Carvalho de Melo
2020-12-15 15:24 ` Jiri Olsa
2020-12-15 16:03 ` Arnaldo Carvalho de Melo
2020-12-15 16:18 ` Jiri Olsa
2020-12-15 16:27 ` Arnaldo Carvalho de Melo
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