linux-kernel - Re: [PATCH v1 2/8] perf evlist: implement control command handling functions

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Date:   Thu, 2 Apr 2020 16:17:29 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Alexey Budankov <alexey.budankov@...ux.intel.com>
Cc:     Arnaldo Carvalho de Melo <acme@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Andi Kleen <ak@...ux.intel.com>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 2/8] perf evlist: implement control command handling
 functions

On Fri, Mar 27, 2020 at 11:46:43AM +0300, Alexey Budankov wrote:

SNIP

> +
> +int perf_evlist__ctlfd_process(struct evlist *evlist, enum evlist_ctl_cmd *cmd)
> +{
> +	int err = 0;
> +	int ctlfd_pos = evlist->ctl_fd_pos;
> +	struct pollfd *entries = evlist->core.pollfd.entries;
> +
> +	if (!entries[ctlfd_pos].revents)
> +		return 0;
> +
> +	if (entries[ctlfd_pos].revents & POLLIN) {
> +		err = perf_evlist__ctlfd_recv(evlist, cmd);
> +		if (err > 0) {
> +			switch (*cmd) {
> +			case CTL_CMD_RESUME:
> +				evlist__enable(evlist);
> +				break;
> +			case CTL_CMD_PAUSE:
> +				evlist__disable(evlist);
> +				break;

would CTL_CMD_ENABLE, CTL_CMD_DISABLE be better fit in here?

especialy because we have the 'pause' ioctl for sampling,
which I was thinking initialy you are using for record,

and it's still might be better fit for sampling than disable, no?

jirka

> +			case CTL_CMD_ACK:
> +			case CTL_CMD_UNSUPPORTED:
> +			default:
> +				pr_debug("ctlfd: unsupported %d\n", *cmd);
> +				break;
> +			}
> +			if (!(*cmd == CTL_CMD_ACK || *cmd == CTL_CMD_UNSUPPORTED))
> +				perf_evlist__ctlfd_ack(evlist);
> +		}
> +	}
> +

SNIP