From: Jiri Olsa <jolsa@redhat.com>
To: Alexey Budankov <alexey.budankov@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>,
Namhyung Kim <namhyung@kernel.org>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>, Andi Kleen <ak@linux.intel.com>,
linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v3 2/9] perf evlist: implement control command handling functions
Date: Wed, 20 May 2020 14:38:07 +0200 [thread overview]
Message-ID: <20200520123807.GD157452@krava> (raw)
In-Reply-To: <ffcdb43a-8f7d-b16f-d59b-19293037af84@linux.intel.com>
On Wed, May 13, 2020 at 11:00:02AM +0300, Alexey Budankov wrote:
SNIP
> +
> +static int evlist__ctlfd_recv(struct evlist *evlist, enum evlist_ctl_cmd *cmd,
> + char *cmd_data, size_t data_size)
> +{
> + int err;
> + char c;
> + size_t bytes_read = 0;
> +
> + memset(cmd_data, 0, data_size--);
> +
> + do {
> + err = read(evlist->ctl_fd, &c, 1);
> + if (err > 0) {
> + if (c == '\n' || c == '\0')
> + break;
> + cmd_data[bytes_read++] = c;
> + if (bytes_read == data_size)
> + break;
> + } else {
> + if (err == -1)
> + pr_err("Failed to read from ctlfd %d: %m\n", evlist->ctl_fd);
> + break;
> + }
> + } while (1);
> +
> + pr_debug("Message from ctl_fd: \"%s%s\"\n", cmd_data,
> + bytes_read == data_size ? "" : c == '\n' ? "\\n" : "\\0");
> +
> + if (err > 0) {
> + if (!strncmp(cmd_data, EVLIST_CTL_CMD_ENABLE_TAG,
> + strlen(EVLIST_CTL_CMD_ENABLE_TAG))) {
> + *cmd = EVLIST_CTL_CMD_ENABLE;
> + } else if (!strncmp(cmd_data, EVLIST_CTL_CMD_DISABLE_TAG,
> + strlen(EVLIST_CTL_CMD_DISABLE_TAG))) {
> + *cmd = EVLIST_CTL_CMD_DISABLE;
> + }
are there more comands comming?
jirka
next prev parent reply other threads:[~2020-05-20 12:38 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-13 7:53 [PATCH v3 0/9] perf: support enable and disable commands in stat and record modes Alexey Budankov
2020-05-13 7:59 ` [PATCH v3 1/9] perf evlist: introduce control file descriptors Alexey Budankov
2020-05-20 12:38 ` Jiri Olsa
2020-05-20 14:46 ` Alexey Budankov
2020-05-13 8:00 ` [PATCH v3 2/9] perf evlist: implement control command handling functions Alexey Budankov
2020-05-20 12:38 ` Jiri Olsa [this message]
2020-05-20 14:56 ` Alexey Budankov
2020-05-13 8:00 ` [PATCH v3 3/9] perf stat: factor out event handling loop into a function Alexey Budankov
2020-05-20 12:38 ` Jiri Olsa
2020-05-20 15:17 ` Alexey Budankov
2020-05-21 11:48 ` Jiri Olsa
2020-05-13 8:01 ` [PATCH v3 4/9] perf stat: extend -D,--delay option with -1 value Alexey Budankov
2020-05-13 8:02 ` [PATCH v3 5/9] perf stat: implement control commands handling Alexey Budankov
2020-05-13 8:03 ` [PATCH v3 6/9] perf stat: introduce --ctl-fd[-ack] options Alexey Budankov
2020-05-20 12:38 ` Jiri Olsa
2020-05-20 15:05 ` Alexey Budankov
2020-05-13 8:03 ` [PATCH v3 7/9] perf record: extend -D,--delay option with -1 value Alexey Budankov
2020-05-13 8:04 ` [PATCH v3 8/9] perf record: implement control commands handling Alexey Budankov
2020-05-20 12:38 ` Jiri Olsa
2020-05-20 18:06 ` Alexey Budankov
2020-05-13 8:05 ` [PATCH v3 9/9] perf record: introduce --ctl-fd[-ack] options Alexey Budankov
2020-05-20 12:38 ` Jiri Olsa
2020-05-20 15:21 ` Alexey Budankov
2020-05-18 8:08 ` [PATCH v3 0/9] perf: support enable and disable commands in stat and record modes Alexey Budankov
2020-05-20 10:55 ` Jiri Olsa
-- strict thread matches above, loose matches on Subject: below --
2020-05-08 10:43 Alexey Budankov
2020-05-08 10:48 ` [PATCH v3 2/9] perf evlist: implement control command handling functions Alexey Budankov
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