[PATCH 08/28] perf trace: Beautify the umount's 'name' argument

From: Arnaldo Carvalho de Melo
Date: Wed Oct 31 2018 - 12:45:55 EST


From: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>

By using the SCA_FILENAME beautifier, that works when either the
probe:vfs_getname probe is in place or with the eBPF program
tools/perf/examples/bpf/augmented_syscalls.c:

# perf probe -l
probe:vfs_getname (on getname_flags:73@acme/git/linux/fs/namei.c with pathname)
# perf trace -e umount
9630.332 ( 9.521 ms): umount/8082 umount2(name: /mnt) = 0
#

The augmented syscalls one will be done in the next patch.

Cc: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Cc: Benjamin Peterson <benjamin@xxxxxxxxxx>
Cc: David Ahern <dsahern@xxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Wang Nan <wangnan0@xxxxxxxxxx>
Link: https://lkml.kernel.org/n/tip-hegbzlpd2nrn584l5jxn7sy2@xxxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
tools/perf/builtin-trace.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index db8711061ca3..d286f73ef2e5 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -838,7 +838,8 @@ static struct syscall_fmt {
.arg = { [2] = { .scnprintf = SCA_SIGNUM, /* sig */ }, }, },
{ .name = "tkill",
.arg = { [1] = { .scnprintf = SCA_SIGNUM, /* sig */ }, }, },
- { .name = "umount2", .alias = "umount", },
+ { .name = "umount2", .alias = "umount",
+ .arg = { [0] = { .scnprintf = SCA_FILENAME, /* name */ }, }, },
{ .name = "uname", .alias = "newuname", },
{ .name = "unlinkat",
.arg = { [0] = { .scnprintf = SCA_FDAT, /* dfd */ }, }, },
--
2.14.4