linux-kernel - Re: [PATCH v1 3/4] perf record: add ability to name registers to record

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Date:	Thu, 20 Aug 2015 13:02:28 -0700
From:	Stephane Eranian <eranian@...gle.com>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	"mingo@...e.hu" <mingo@...e.hu>,
	"ak@...ux.intel.com" <ak@...ux.intel.com>,
	Namhyung Kim <namhyung@...nel.org>,
	"Liang, Kan" <kan.liang@...el.com>,
	David Ahern <dsahern@...il.com>,
	Adrian Hunter <adrian.hunter@...el.com>
Subject: Re: [PATCH v1 3/4] perf record: add ability to name registers to record

On Thu, Aug 20, 2015 at 4:18 AM, Jiri Olsa <jolsa@...hat.com> wrote:
> On Wed, Aug 19, 2015 at 10:38:25AM +0200, Stephane Eranian wrote:
>
> SNIP
>
>> diff --git a/tools/perf/util/parse-regs-options.c b/tools/perf/util/parse-regs-options.c
>> new file mode 100644
>> index 0000000..4f2c1c2
>> --- /dev/null
>> +++ b/tools/perf/util/parse-regs-options.c
>> @@ -0,0 +1,71 @@
>> +#include "perf.h"
>> +#include "util/util.h"
>> +#include "util/debug.h"
>> +#include "util/parse-options.h"
>> +#include "util/parse-regs-options.h"
>> +
>> +int
>> +parse_regs(const struct option *opt, const char *str, int unset)
>> +{
>> +     uint64_t *mode = (uint64_t *)opt->value;
>> +     const struct sample_reg *r;
>> +     char *s, *os = NULL, *p;
>> +     int ret = -1;
>> +
>> +     if (unset)
>> +             return 0;
>> +
>> +     /*
>> +      * cannot set it twice
>> +      */
>> +     if (*mode)
>> +             return -1;
>> +
>> +     /* str may be NULL in case no arg is passed to -I */
>> +     if (str) {
>> +             /* because str is read-only */
>> +             s = os = strdup(str);
>> +             if (!s)
>> +                     return -1;
>> +
>> +             for (;;) {
>> +                     p = strchr(s, ',');
>> +                     if (p)
>> +                             *p = '\0';
>> +
>> +                     if (!strcmp(s, "?")) {
>> +                             fprintf(stderr, "available registers: ");
>> +                             for (r = sample_reg_masks; r->name; r++) {
>> +                                     fprintf(stderr, "%s ", r->name);
>> +                             }
>> +                             fputc('\n', stderr);
>> +                             /* just printing available regs */
>> +                             return -1;
>> +                     }
>> +                     for (r = sample_reg_masks; r->name; r++) {
>
> the new 'I' is arch dependent, would this fail to link on
> other archs besides x86_64 ?  haven't tried though
>
It should not if there is a weak symbol for the sample_regs_masks[].
I think I forgot to add that. Will do in v2.
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