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perf trace: Allow associating scnprintf routines with well known arg names

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[ Upstream commit 5d88099bc00dccddf5da18e25e1223f01644f7a2 ]

For instance 'msr' appears in several tracepoints, so we can associate
it with a single scnprintf() routine auto-generated from kernel headers,
as will be done in followup patches.

Start with an empty array of associations.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lkml.kernel.org/n/tip-89ptht6s5fez82lykuwq1eyb@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Stable-dep-of: 03e9a5d8eb55 ("perf trace: Handle failure when trace point folder is missed")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Arnaldo Carvalho de Melo 2019-10-07 15:50:15 -03:00 committed by Greg Kroah-Hartman
parent 97cc27a28d
commit 339e08e185
1 changed files with 26 additions and 0 deletions
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26
tools/perf/builtin-trace.c
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@ -1455,6 +1455,27 @@ static int syscall__alloc_arg_fmts(struct syscall *sc, int nr_args)
return 0;
}
static struct syscall_arg_fmt syscall_arg_fmts__by_name[] = {
};
static int syscall_arg_fmt__cmp(const void *name, const void *fmtp)
{
const struct syscall_arg_fmt *fmt = fmtp;
return strcmp(name, fmt->name);
}
static struct syscall_arg_fmt *
__syscall_arg_fmt__find_by_name(struct syscall_arg_fmt *fmts, const int nmemb, const char *name)
{
return bsearch(name, fmts, nmemb, sizeof(struct syscall_arg_fmt), syscall_arg_fmt__cmp);
}
static struct syscall_arg_fmt *syscall_arg_fmt__find_by_name(const char *name)
{
const int nmemb = ARRAY_SIZE(syscall_arg_fmts__by_name);
return __syscall_arg_fmt__find_by_name(syscall_arg_fmts__by_name, nmemb, name);
}
static struct tep_format_field *
syscall_arg_fmt__init_array(struct syscall_arg_fmt *arg, struct tep_format_field *field)
{
@ -1491,6 +1512,11 @@ syscall_arg_fmt__init_array(struct syscall_arg_fmt *arg, struct tep_format_field
* 7 unsigned long
*/
arg->scnprintf = SCA_FD;
} else {
struct syscall_arg_fmt *fmt = syscall_arg_fmt__find_by_name(field->name);
if (fmt)
arg->scnprintf = fmt->scnprintf;
}
}