linux-kernel - Re: [PATCH v1 1/3] perf record: allocate affinity masks

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Date:   Wed, 12 Dec 2018 13:15:24 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Alexey Budankov <alexey.budankov@...ux.intel.com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Andi Kleen <ak@...ux.intel.com>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 1/3] perf record: allocate affinity masks

On Wed, Dec 12, 2018 at 10:38:23AM +0300, Alexey Budankov wrote:
> 
> Allocate affinity option and masks for mmap data buffers and
> record thread as well as initialize allocated objects.
> 
> Signed-off-by: Alexey Budankov <alexey.budankov@...ux.intel.com>
> ---
>  tools/perf/builtin-record.c | 11 ++++++++++-
>  tools/perf/perf.h           |  5 +++++
>  tools/perf/util/evlist.c    |  6 +++---
>  tools/perf/util/evlist.h    |  2 +-
>  tools/perf/util/mmap.c      |  2 ++
>  tools/perf/util/mmap.h      |  3 ++-
>  6 files changed, 23 insertions(+), 6 deletions(-)
> 
> diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
> index 882285fb9f64..4979719e54ae 100644
> --- a/tools/perf/builtin-record.c
> +++ b/tools/perf/builtin-record.c
> @@ -81,6 +81,7 @@ struct record {
>  	bool			timestamp_boundary;
>  	struct switch_output	switch_output;
>  	unsigned long long	samples;
> +	cpu_set_t		affinity_mask;
>  };
>  
>  static volatile int auxtrace_record__snapshot_started;
> @@ -533,7 +534,8 @@ static int record__mmap_evlist(struct record *rec,
>  
>  	if (perf_evlist__mmap_ex(evlist, opts->mmap_pages,
>  				 opts->auxtrace_mmap_pages,
> -				 opts->auxtrace_snapshot_mode, opts->nr_cblocks) < 0) {
> +				 opts->auxtrace_snapshot_mode,
> +				 opts->nr_cblocks, opts->affinity) < 0) {
>  		if (errno == EPERM) {
>  			pr_err("Permission error mapping pages.\n"
>  			       "Consider increasing "
> @@ -1980,6 +1982,9 @@ int cmd_record(int argc, const char **argv)
>  # undef REASON
>  #endif
>  
> +	CPU_ZERO(&rec->affinity_mask);
> +	rec->opts.affinity = PERF_AFFINITY_SYS;
> +
>  	rec->evlist = perf_evlist__new();
>  	if (rec->evlist == NULL)
>  		return -ENOMEM;
> @@ -2143,6 +2148,10 @@ int cmd_record(int argc, const char **argv)
>  	if (verbose > 0)
>  		pr_info("nr_cblocks: %d\n", rec->opts.nr_cblocks);
>  
> +	pr_debug("affinity (UNSET:%d, NODE:%d, CPU:%d) = %d\n",
> +		 PERF_AFFINITY_SYS, PERF_AFFINITY_NODE,
> +		 PERF_AFFINITY_CPU, rec->opts.affinity);

please make this user friendly and display the actual string like "UNSET/NODE/CPU"

> +
>  	err = __cmd_record(&record, argc, argv);
>  out:
>  	perf_evlist__delete(rec->evlist);
> diff --git a/tools/perf/perf.h b/tools/perf/perf.h
> index 388c6dd128b8..08e75815de2f 100644
> --- a/tools/perf/perf.h
> +++ b/tools/perf/perf.h
> @@ -83,8 +83,13 @@ struct record_opts {
>  	clockid_t    clockid;
>  	u64          clockid_res_ns;
>  	int	     nr_cblocks;
> +	int	     affinity;
>  };
>  
> +#define PERF_AFFINITY_SYS  0
> +#define PERF_AFFINITY_NODE 1
> +#define PERF_AFFINITY_CPU  2

please put those to enum

thanks,
jirka