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Commit 339e08e1 authored by Arnaldo Carvalho de Melo's avatar Arnaldo Carvalho de Melo Committed by Greg Kroah-Hartman
Browse files

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

[ 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: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
Stable-dep-of: 03e9a5d8eb55 ("perf trace: Handle failure when trace point folder is missed")
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
parent 97cc27a2

tools/perf/builtin-trace.c

+26 −0
Original line number Diff line number Diff line
@@ -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;

		}

	}