From: Arnaldo Carvalho de Melo <[email protected]>
Make 'perf trace' more accessible by aliasing it to just 'trace':
[root@zoo linux]# trace --duration 15 -a -e futex sleep 1
110.092 (16.188 ms): libvirtd/1166 futex(uaddr: 0x185b344, op: WAIT|PRIV,
val: 174293 ) = 0
110.101 (15.903 ms): libvirtd/1171 futex(uaddr: 0x185b3dc, op: WAIT|PRIV,
val: 139265 ) = 0
111.594 (15.776 ms): libvirtd/1165 futex(uaddr: 0x185b344, op: WAIT|PRIV,
val: 174295 ) = 0
111.610 (15.969 ms): libvirtd/1169 futex(uaddr: 0x185b3dc, op: WAIT|PRIV,
val: 139267 ) = 0
113.556 (16.216 ms): libvirtd/1168 futex(uaddr: 0x185b3dc, op: WAIT|PRIV,
val: 139269 ) = 0
291.265 (199.508 ms): chromium-brows/15830 futex(uaddr: 0x7fff2986bcb4, op:
WAIT_BITSET|PRIV|CLKRT, val: 1, utime: 0x7fff2986bab0, val3: 4294967295) = -1
ETIMEDOUT Connection timed out
360.354 (69.053 ms): chromium-brows/15830 futex(uaddr: 0x7fff2986bcb4, op:
WAIT_BITSET|PRIV|CLKRT, val: 1, utime: 0x7fff2986bab0, val3: 4294967295) = -1
ETIMEDOUT Connection timed out
[root@zoo linux]#
I.e. looking for futex calls that take at least 15ms, system wide, during a one
second window. Now to get callchains into 'trace' to figure out what are those
locks :-)
Requested-by: Ingo Molnar <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: David Ahern <[email protected]>
Cc: Frederic Weisbecker <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Mike Galbraith <[email protected]>
Cc: Paul Mackerras <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Stephane Eranian <[email protected]>
Link: http://lkml.kernel.org/n/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
---
tools/perf/Makefile.perf | 2 ++
tools/perf/perf.c | 9 ++++++++-
2 files changed, 10 insertions(+), 1 deletion(-)
diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
index 1f1361531f92..2badb08a0037 100644
--- a/tools/perf/Makefile.perf
+++ b/tools/perf/Makefile.perf
@@ -78,6 +78,7 @@ CC = $(CROSS_COMPILE)gcc
AR = $(CROSS_COMPILE)ar
RM = rm -f
+LN = ln -f
MKDIR = mkdir
FIND = find
INSTALL = install
@@ -809,6 +810,7 @@ install-gtk:
install-bin: all install-gtk
$(INSTALL) -d -m 755 '$(DESTDIR_SQ)$(bindir_SQ)'
$(INSTALL) $(OUTPUT)perf '$(DESTDIR_SQ)$(bindir_SQ)'
+ $(LN) '$(DESTDIR_SQ)$(bindir_SQ)/perf' '$(DESTDIR_SQ)$(bindir_SQ)/trace'
$(INSTALL) -d -m 755 '$(DESTDIR_SQ)$(perfexec_instdir_SQ)'
$(INSTALL) $(OUTPUT)perf-archive -t
'$(DESTDIR_SQ)$(perfexec_instdir_SQ)'
ifndef NO_LIBPERL
diff --git a/tools/perf/perf.c b/tools/perf/perf.c
index 626577830264..8b38b4e80ec2 100644
--- a/tools/perf/perf.c
+++ b/tools/perf/perf.c
@@ -481,7 +481,14 @@ int main(int argc, const char **argv)
fprintf(stderr, "cannot handle %s internally", cmd);
goto out;
}
-
+#ifdef HAVE_LIBAUDIT_SUPPORT
+ if (!prefixcmp(cmd, "trace")) {
+ set_buildid_dir();
+ setup_path();
+ argv[0] = "trace";
+ return cmd_trace(argc, argv, NULL);
+ }
+#endif
/* Look for flags.. */
argv++;
argc--;
--
1.8.1.4
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