linux-kernel - Re: [PATCH v3 1/9] perf evlist: introduce control file descriptors

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Date:   Wed, 20 May 2020 14:38:26 +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 v3 1/9] perf evlist: introduce control file descriptors

On Wed, May 13, 2020 at 10:59:00AM +0300, Alexey Budankov wrote:
> 
> Define and initialize control file descriptors.
> 
> Signed-off-by: Alexey Budankov <alexey.budankov@...ux.intel.com>
> ---
>  tools/perf/util/evlist.c | 3 +++
>  tools/perf/util/evlist.h | 3 +++
>  2 files changed, 6 insertions(+)
> 
> diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
> index 2a9de6491700..aa61619fa304 100644
> --- a/tools/perf/util/evlist.c
> +++ b/tools/perf/util/evlist.c
> @@ -63,6 +63,9 @@ void evlist__init(struct evlist *evlist, struct perf_cpu_map *cpus,
>  	perf_evlist__set_maps(&evlist->core, cpus, threads);
>  	evlist->workload.pid = -1;
>  	evlist->bkw_mmap_state = BKW_MMAP_NOTREADY;
> +	evlist->ctl_fd = -1;
> +	evlist->ctl_fd_ack = -1;
> +	evlist->ctl_fd_pos = -1;
>  }
>  
>  struct evlist *evlist__new(void)
> diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h
> index b6f325dfb4d2..62f259d89b41 100644
> --- a/tools/perf/util/evlist.h
> +++ b/tools/perf/util/evlist.h
> @@ -74,6 +74,9 @@ struct evlist {
>  		pthread_t		th;
>  		volatile int		done;
>  	} thread;
> +	int		ctl_fd;
> +	int		ctl_fd_ack;
> +	int		ctl_fd_pos;

we are using the anonymous structs to keep related
parts together like for workload and thread

could you use it in there as well?

jirka

>  };
>  
>  struct evsel_str_handler {
> -- 
> 2.24.1
>