linux-kernel - Re: [PATCH 03/15] perf mem: Add -l/--ldlat option

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Date:	Wed, 24 Feb 2016 10:14:27 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Jiri Olsa <jolsa@...nel.org>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Stephane Eranian <eranian@...gle.com>,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 03/15] perf mem: Add -l/--ldlat option

Em Wed, Feb 24, 2016 at 09:46:44AM +0100, Jiri Olsa escreveu:
> Adding -l/--ldlat option to specify desired latency
> for loads event.
> 
> Specify 50 as loads event latency:
> 
>   $ perf mem record -e ldlat-loads -v -l 50 true
>   calling: record -W -d -e cpu/mem-loads,ldlat=50/P true

Please update the docs, also I think it is ok to leave it just as
--ldlat, not using the one letter -l, we can do that if this becomes
that frequently used.

- Arnaldo
 
> Link: http://lkml.kernel.org/n/tip-ec2m0cvivkfs8uhtiv411hfc@git.kernel.org
> Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> ---
>  tools/perf/builtin-mem.c     |  1 +
>  tools/perf/util/mem-events.c | 17 ++++++++++++++++-
>  tools/perf/util/mem-events.h |  1 +
>  3 files changed, 18 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/perf/builtin-mem.c b/tools/perf/builtin-mem.c
> index 88aeac9aa1da..9da09e058f4b 100644
> --- a/tools/perf/builtin-mem.c
> +++ b/tools/perf/builtin-mem.c
> @@ -66,6 +66,7 @@ static int __cmd_record(int argc, const char **argv, struct perf_mem *mem)
>  	OPT_CALLBACK('e', "event", &mem, "event",
>  		     "event selector. use 'perf mem record -e list' to list available events",
>  		     parse_record_events),
> +	OPT_UINTEGER('l', "ldlat", &perf_mem_events__loads_ldlat, "mem-loads latency"),
>  	OPT_INCR('v', "verbose", &verbose,
>  		 "be more verbose (show counter open errors, etc)"),
>  	OPT_END()
> diff --git a/tools/perf/util/mem-events.c b/tools/perf/util/mem-events.c
> index 0f62e930de13..3772a3a8a6ee 100644
> --- a/tools/perf/util/mem-events.c
> +++ b/tools/perf/util/mem-events.c
> @@ -9,18 +9,33 @@
>  #include "mem-events.h"
>  #include "debug.h"
>  
> +unsigned int perf_mem_events__loads_ldlat = 30;
> +
>  #define E(t, n, s) { .tag = t, .name = n, .sysfs_name = s }
>  
>  struct perf_mem_event perf_mem_events[PERF_MEM_EVENTS__MAX] = {
> -	E("ldlat-loads",	"cpu/mem-loads,ldlat=30/P",	"mem-loads"),
> +	E("ldlat-loads",	"cpu/mem-loads,ldlat=%u/P",	"mem-loads"),
>  	E("ldlat-stores",	"cpu/mem-stores/P",		"mem-stores"),
>  };
>  #undef E
>  
>  #undef E
>  
> +static char mem_loads_name[100];
> +static bool mem_loads_name__init;
> +
>  char *perf_mem_events__name(int i)
>  {
> +	if (i == PERF_MEM_EVENTS__LOAD) {
> +		if (!mem_loads_name__init) {
> +			mem_loads_name__init = true;
> +			scnprintf(mem_loads_name, sizeof(mem_loads_name),
> +				  perf_mem_events[i].name,
> +				  perf_mem_events__loads_ldlat);
> +		}
> +		return mem_loads_name;
> +	}
> +
>  	return (char *) perf_mem_events[i].name;
>  }
>  
> diff --git a/tools/perf/util/mem-events.h b/tools/perf/util/mem-events.h
> index 2a91b959de62..4ab437291589 100644
> --- a/tools/perf/util/mem-events.h
> +++ b/tools/perf/util/mem-events.h
> @@ -18,6 +18,7 @@ enum {
>  };
>  
>  extern struct perf_mem_event perf_mem_events[PERF_MEM_EVENTS__MAX];
> +extern unsigned int perf_mem_events__loads_ldlat;
>  
>  int perf_mem_events__parse(const char *str);
>  int perf_mem_events__init(void);
> -- 
> 2.4.3