The s390 architecture maps sys_mmap (nr 90) into sys_old_mmap.
For this reason perf trace can't find the proper syscall event
to get args format from and displays it wrong as 'continued'.
To fix that fill "alias" field with "old_mmap" for trace's mmap
record to get the correct translation.
Before:
0.042 ( 0.011 ms): vest/43052 fstat(statbuf: 0x3ffff89fd90
) = 0
0.042 ( 0.028 ms): vest/43052 ... [continued]: mmap()) = 0x3fffd6e2000
0.072 ( 0.025 ms): vest/43052 read(buf: 0x3fffd6e2000, count: 4096
) = 6
After:
0.045 ( 0.011 ms): fstat(statbuf: 0x3ffff8a0930
) = 0
0.057 ( 0.018 ms): mmap(arg: 0x3ffff8a0858
) = 0x3fffd14a000
0.076 ( 0.025 ms): read(buf: 0x3fffd14a000, count: 4096
) = 6
Link: http://lkml.kernel.org/n/tip-3jrfsbpclxr1ftke2t9rp...@git.kernel.org
Signed-off-by: Jiri Olsa <jo...@kernel.org>
---
tools/perf/builtin-trace.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index d014350adc52..4b2a5d298197 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -681,6 +681,10 @@ static struct syscall_fmt {
{ .name = "mlockall", .errmsg = true,
.arg_scnprintf = { [0] = SCA_HEX, /* addr */ }, },
{ .name = "mmap", .hexret = true,
+/* The standard mmap maps to old_mmap on s390x */
+#if defined(__s390x__)
+ .alias = "old_mmap",
+#endif
.arg_scnprintf = { [0] = SCA_HEX, /* addr */
[2] = SCA_MMAP_PROT, /* prot */
[3] = SCA_MMAP_FLAGS, /* flags */ }, },
--
2.9.4
