The following commit has been merged into the perf/core branch of tip:
Commit-ID: 5d88099bc00dccddf5da18e25e1223f01644f7a2
Gitweb: https://git.kernel.org/tip/5d88099bc00dccddf5da18e25e1223f01644f7a2
Author: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
AuthorDate: Mon, 07 Oct 2019 15:50:15 -03:00
Committer: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitterDate: Wed, 09 Oct 2019 11:23:52 -03:00
perf trace: Allow associating scnprintf routines with well known arg names
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@xxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Link: https://lkml.kernel.org/n/tip-89ptht6s5fez82lykuwq1eyb@xxxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
tools/perf/builtin-trace.c | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)
diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index 8303d83..d52972c 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -1479,6 +1479,27 @@ 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)
{
@@ -1518,6 +1539,11 @@ 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;
}
}
|