perf trace beauty: Beautify renameat2's fd arg wrt AT_FDCWD

Commit-ID:  84a835412cdc36f3821a1daa10853f9c9aa3fc7c
Gitweb:     https://git.kernel.org/tip/84a835412cdc36f3821a1daa10853f9c9aa3fc7c
Author:     Arnaldo Carvalho de Melo <[email protected]>
AuthorDate: Tue, 11 Dec 2018 09:53:21 -0300
Committer:  Arnaldo Carvalho de Melo <[email protected]>
CommitDate: Tue, 18 Dec 2018 12:23:55 -0300

perf trace beauty: Beautify renameat2's fd arg wrt AT_FDCWD

Just like is done with the 'renameat' syscall.

  # strace -e renameat2 -f perf trace -e rename* mv c /tmp
  [pid 12334] renameat2(AT_FDCWD, "c", AT_FDCWD, "/tmp", RENAME_NOREPLACE) = -1 EXDEV (Invalid cross-device link)
  [pid 12334] renameat2(AT_FDCWD, "c", AT_FDCWD, "/tmp/c", RENAME_NOREPLACE) = -1 EEXIST (File exists)
     1.947 ( 0.007 ms): mv/12334 renameat2(olddfd: CWD, oldname: 0x7ffce8b7fd81, newdfd: CWD, newname: 0x7ffce8b7fd83, flags: 1) = -1 EXDEV Invalid cross-device link
     2.073 ( 0.009 ms): mv/12334 renameat2(olddfd: CWD, oldname: 0x7ffce8b7fd81, newdfd: CWD, newname: 0x55ce7f0a1cc0, flags: 1mv: ) = -1 EEXIST File exists'c' and '/tmp/c' are the same file
  #

---
 tools/perf/builtin-trace.c | 3 +++
 1 file changed, 3 insertions(+)

index 406bceda6a2b..60c61a89436f 100644
@@ -799,6 +799,9 @@ static struct syscall_fmt {
 	  .arg = { [2] = { .scnprintf = SCA_MSG_FLAGS, /* flags */ }, }, },
 	{ .name	    = "renameat",
 	  .arg = { [0] = { .scnprintf = SCA_FDAT, /* dfd */ }, }, },
+	{ .name	    = "renameat2",
+	  .arg = { [0] = { .scnprintf = SCA_FDAT, /* olddirfd */ },
+		   [2] = { .scnprintf = SCA_FDAT, /* newdirfd */ }, }, },
 	{ .name	    = "rt_sigaction",
 	  .arg = { [0] = { .scnprintf = SCA_SIGNUM, /* sig */ }, }, },
 	{ .name	    = "rt_sigprocmask",