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* [PATCH v2 7/7] perf: integrate liblockdep support into perf
@ 2013-02-01 17:15 Sasha Levin
  2013-02-03 11:05 ` Ingo Molnar
  0 siblings, 1 reply; 4+ messages in thread
From: Sasha Levin @ 2013-02-01 17:15 UTC (permalink / raw)
  To: mingo, peterz; +Cc: paulus, acme, penberg, linux-kernel, Sasha Levin

liblockdep is simply userspace lockdep. We can use that to analyze and
verify the locking in perf.

Usage is simple, to compile perf with liblockdep all that's needed it:

	make LIBLOCK=[path to liblockdep]

Once liblockdep support is compiled in, perf will yell if locking goes
wrong for any reason:

=============================================
[ INFO: possible recursive locking detected ]
liblockdep 0.0.1
---------------------------------------------
perf/23237 is trying to acquire lock:
 (sched.start_work_mutex){......}, at: ./perf() [0x419793]

but task is already holding lock:
 (sched.start_work_mutex){......}, at: ./perf() [0x419793]

other info that might help us debug this:
 Possible unsafe locking scenario:

       CPU0
       ----
  lock(sched.start_work_mutex);
  lock(sched.start_work_mutex);

 *** DEADLOCK ***

 May be due to missing lock nesting notation

2 locks held by perf/23237:
 #0:  (sched.start_work_mutex){......}, at: ./perf() [0x419793]
 #1:  (sched.work_done_wait_mutex){......}, at: ./perf() [0x419793]

stack backtrace:
/usr/lib64/liblockdep.so(+0x1ba0)[0x7fa067f99ba0]
/usr/lib64/liblockdep.so(+0x37bf)[0x7fa067f9b7bf]
/usr/lib64/liblockdep.so(+0x3899)[0x7fa067f9b899]
/usr/lib64/liblockdep.so(+0x429a)[0x7fa067f9c29a]
/usr/lib64/liblockdep.so(+0x4db1)[0x7fa067f9cdb1]
/usr/lib64/liblockdep.so(lock_acquire+0x97)[0x7fa067f9d8b4]
./perf(cmd_sched+0xb166)[0x42d976]
./perf[0x419793]
./perf(main+0x529)[0x418f59]
/lib64/libc.so.6(__libc_start_main+0xed)[0x7fa063ae591d]
./perf[0x4190d9]

Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
---

I've forgot a debug line in the original patch, resending it without it.

 tools/perf/Makefile                 | 22 ++++++++++++++++++++++
 tools/perf/builtin-sched.c          |  6 ++++--
 tools/perf/builtin-top.c            |  4 ++++
 tools/perf/config/feature-tests.mak | 12 ++++++++++++
 tools/perf/perf.c                   |  3 +++
 tools/perf/ui/setup.c               |  5 ++++-
 tools/perf/util/hist.h              |  1 +
 tools/perf/util/liblockdep.h        | 11 +++++++++++
 tools/perf/util/util.h              |  1 +
 9 files changed, 62 insertions(+), 3 deletions(-)
 create mode 100644 tools/perf/util/liblockdep.h

diff --git a/tools/perf/Makefile b/tools/perf/Makefile
index 8ab05e5..994329d 100644
--- a/tools/perf/Makefile
+++ b/tools/perf/Makefile
@@ -572,6 +572,21 @@ ifneq ($(call try-cc,$(SOURCE_LIBUNWIND),$(FLAGS_UNWIND),libunwind),y)
 endif # Libunwind support
 endif # NO_LIBUNWIND
 
+ifndef NO_LIBLOCKDEP
+# for linking with liblockdep library, run like:
+# make DEBUG=1 LIBLOCK_DIR=/path/to/linux.git/tools/lib/lockdep/
+ifdef LIBLOCKDEP_DIR
+	LIBLOCKDEP_CFLAGS  := -I$(LIBLOCKDEP_DIR)/include -D__USE_LIBLOCKDEP
+	LIBLOCKDEP_LDFLAGS := -L$(LIBLOCKDEP_DIR)/ -llockdep
+endif
+
+FLAGS_LIBLOCKDEP=$(LIBLOCKDEP_CFLAGS) $(ALL_CFLAGS) $(LIBLOCKDEP_LDFLAGS) $(ALL_LDFLAGS) $(EXTLIBS)
+ifneq ($(call try-cc,$(SOURCE_LIBLOCKDEP),$(FLAGS_LIBLOCKDEP),liblockdep),y)
+	msg := $(warning No liblockdep found.);
+	NO_LIBLOCKDEP := 1
+endif # liblockdep support
+endif # NO_LIBLOCKDEP
+
 -include arch/$(ARCH)/Makefile
 
 ifneq ($(OUTPUT),)
@@ -621,6 +636,13 @@ ifndef NO_LIBUNWIND
 	LIB_OBJS += $(OUTPUT)util/unwind.o
 endif
 
+ifndef NO_LIBLOCKDEP
+	BASIC_CFLAGS += -D__USE_LIBLOCKDEP
+	EXTLIBS += $(LIBLOCKDEP_LIBS)
+	BASIC_CFLAGS := $(LIBLOCKDEP_CFLAGS) $(BASIC_CFLAGS)
+	BASIC_LDFLAGS := $(LIBLOCKDEP_LDFLAGS) $(BASIC_LDFLAGS)
+endif
+
 ifndef NO_LIBAUDIT
 	FLAGS_LIBAUDIT = $(ALL_CFLAGS) $(ALL_LDFLAGS) -laudit
 	ifneq ($(call try-cc,$(SOURCE_LIBAUDIT),$(FLAGS_LIBAUDIT),libaudit),y)
diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
index cc28b85..53d9225 100644
--- a/tools/perf/builtin-sched.c
+++ b/tools/perf/builtin-sched.c
@@ -468,6 +468,8 @@ static void *thread_func(void *ctx)
 	char comm2[22];
 	int fd;
 
+	liblockdep_set_thread();
+
 	free(parms);
 
 	sprintf(comm2, ":%s", this_task->comm);
@@ -1677,8 +1679,8 @@ int cmd_sched(int argc, const char **argv, const char *prefix __maybe_unused)
 		},
 		.cmp_pid	      = LIST_HEAD_INIT(sched.cmp_pid),
 		.sort_list	      = LIST_HEAD_INIT(sched.sort_list),
-		.start_work_mutex     = PTHREAD_MUTEX_INITIALIZER,
-		.work_done_wait_mutex = PTHREAD_MUTEX_INITIALIZER,
+		.start_work_mutex     = LIBLOCKDEP_PTHREAD_MUTEX_INITIALIZER(sched.start_work_mutex),
+		.work_done_wait_mutex = LIBLOCKDEP_PTHREAD_MUTEX_INITIALIZER(sched.work_done_wait_mutex),
 		.curr_pid	      = { [0 ... MAX_CPUS - 1] = -1 },
 		.sort_order	      = default_sort_order,
 		.replay_repeat	      = 10,
diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index c9ff395..c9b99ef 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -588,6 +588,8 @@ static void *display_thread_tui(void *arg)
 		.refresh	= top->delay_secs,
 	};
 
+	liblockdep_set_thread();
+
 	perf_top__sort_new_samples(top);
 
 	/*
@@ -613,6 +615,8 @@ static void *display_thread(void *arg)
 	struct perf_top *top = arg;
 	int delay_msecs, c;
 
+	liblockdep_set_thread();
+
 	tcgetattr(0, &save);
 	tc = save;
 	tc.c_lflag &= ~(ICANON | ECHO);
diff --git a/tools/perf/config/feature-tests.mak b/tools/perf/config/feature-tests.mak
index f5ac774..1f5a37e 100644
--- a/tools/perf/config/feature-tests.mak
+++ b/tools/perf/config/feature-tests.mak
@@ -217,6 +217,18 @@ int main(void)
 endef
 endif
 
+ifndef NO_LIBLOCKDEP
+define SOURCE_LIBLOCKDEP
+#include <liblockdep/mutex.h>
+
+int main(void)
+{
+	liblockdep_init();
+	return 0;
+}
+endef
+endif
+
 define SOURCE_ON_EXIT
 #include <stdio.h>
 
diff --git a/tools/perf/perf.c b/tools/perf/perf.c
index 0f661fb..ddbd315 100644
--- a/tools/perf/perf.c
+++ b/tools/perf/perf.c
@@ -446,6 +446,9 @@ int main(int argc, const char **argv)
 {
 	const char *cmd;
 
+	liblockdep_init();
+	liblockdep_set_thread();
+
 	page_size = sysconf(_SC_PAGE_SIZE);
 
 	cmd = perf_extract_argv0_path(argv[0]);
diff --git a/tools/perf/ui/setup.c b/tools/perf/ui/setup.c
index ebb4cc1..5c0cdeb 100644
--- a/tools/perf/ui/setup.c
+++ b/tools/perf/ui/setup.c
@@ -3,14 +3,17 @@
 #include "../util/cache.h"
 #include "../util/debug.h"
 #include "../util/hist.h"
+#include "../util/liblockdep.h"
 
-pthread_mutex_t ui__lock = PTHREAD_MUTEX_INITIALIZER;
+pthread_mutex_t ui__lock;
 
 void setup_browser(bool fallback_to_pager)
 {
 	if (!isatty(1) || dump_trace)
 		use_browser = 0;
 
+	pthread_mutex_init(&ui__lock, NULL);
+
 	/* default to TUI */
 	if (use_browser < 0)
 		use_browser = 1;
diff --git a/tools/perf/util/hist.h b/tools/perf/util/hist.h
index 8b091a5..328afe0 100644
--- a/tools/perf/util/hist.h
+++ b/tools/perf/util/hist.h
@@ -5,6 +5,7 @@
 #include <pthread.h>
 #include "callchain.h"
 #include "header.h"
+#include "liblockdep.h"
 
 extern struct callchain_param callchain_param;
 
diff --git a/tools/perf/util/liblockdep.h b/tools/perf/util/liblockdep.h
new file mode 100644
index 0000000..a996259
--- /dev/null
+++ b/tools/perf/util/liblockdep.h
@@ -0,0 +1,11 @@
+#ifdef __USE_LIBLOCKDEP
+
+#include <liblockdep/mutex.h>
+
+#else
+
+#define LIBLOCKDEP_PTHREAD_MUTEX_INITIALIZER(mtx) PTHREAD_MUTEX_INITIALIZER
+#define liblockdep_init()
+#define liblockdep_set_thread()
+
+#endif
diff --git a/tools/perf/util/util.h b/tools/perf/util/util.h
index c233091..06e6244 100644
--- a/tools/perf/util/util.h
+++ b/tools/perf/util/util.h
@@ -73,6 +73,7 @@
 #include <linux/magic.h>
 #include "types.h"
 #include <sys/ttydefaults.h>
+#include "liblockdep.h"
 
 extern const char *graph_line;
 extern const char *graph_dotted_line;
-- 
1.8.1.2


^ permalink raw reply related	[flat|nested] 4+ messages in thread
* Re: [PATCH v2 7/7] perf: integrate liblockdep support into perf
  2013-02-01 17:15 [PATCH v2 7/7] perf: integrate liblockdep support into perf Sasha Levin
@ 2013-02-03 11:05 ` Ingo Molnar
  2013-02-03 21:39   ` Sasha Levin
  0 siblings, 1 reply; 4+ messages in thread
From: Ingo Molnar @ 2013-02-03 11:05 UTC (permalink / raw)
  To: Sasha Levin; +Cc: mingo, peterz, paulus, acme, penberg, linux-kernel


* Sasha Levin <sasha.levin@oracle.com> wrote:

> liblockdep is simply userspace lockdep. We can use that to analyze and
> verify the locking in perf.
> 
> Usage is simple, to compile perf with liblockdep all that's needed it:
> 
> 	make LIBLOCK=[path to liblockdep]

Nice idea.

I'd suggest to link it in directly, like we link in 
libtraceevents.

Then it could be built via something like:

   make LOCKDEP=1

or so.

Thanks,

	Ingo

^ permalink raw reply	[flat|nested] 4+ messages in thread
* Re: [PATCH v2 7/7] perf: integrate liblockdep support into perf
  2013-02-03 11:05 ` Ingo Molnar
@ 2013-02-03 21:39   ` Sasha Levin
  0 siblings, 0 replies; 4+ messages in thread
From: Sasha Levin @ 2013-02-03 21:39 UTC (permalink / raw)
  To: Ingo Molnar; +Cc: mingo, peterz, paulus, acme, penberg, linux-kernel

On 02/03/2013 06:05 AM, Ingo Molnar wrote:
> 
> * Sasha Levin <sasha.levin@oracle.com> wrote:
> 
>> liblockdep is simply userspace lockdep. We can use that to analyze and
>> verify the locking in perf.
>>
>> Usage is simple, to compile perf with liblockdep all that's needed it:
>>
>> 	make LIBLOCK=[path to liblockdep]
> 
> Nice idea.
> 
> I'd suggest to link it in directly, like we link in 
> libtraceevents.
> 
> Then it could be built via something like:
> 
>    make LOCKDEP=1
> 
> or so.
> 

Sounds good, I'll resend the series.


Thanks,
Sasha


^ permalink raw reply	[flat|nested] 4+ messages in thread
* [PATCH v2 7/7] perf: integrate liblockdep support into perf
  2013-02-01 16:47 [PATCH v2 1/7] liblockdep: wrap kernel/lockdep.c to allow usage from userspace Sasha Levin
@ 2013-02-01 16:47 ` Sasha Levin
  0 siblings, 0 replies; 4+ messages in thread
From: Sasha Levin @ 2013-02-01 16:47 UTC (permalink / raw)
  To: mingo, peterz; +Cc: paulus, acme, penberg, linux-kernel, Sasha Levin

liblockdep is simply userspace lockdep. We can use that to analyze and
verify the locking in perf.

Usage is simple, to compile perf with liblockdep all that's needed it:

	make LIBLOCK=[path to liblockdep]

Once liblockdep support is compiled in, perf will yell if locking goes
wrong for any reason:

=============================================
[ INFO: possible recursive locking detected ]
liblockdep 0.0.1
---------------------------------------------
perf/23237 is trying to acquire lock:
 (sched.start_work_mutex){......}, at: ./perf() [0x419793]

but task is already holding lock:
 (sched.start_work_mutex){......}, at: ./perf() [0x419793]

other info that might help us debug this:
 Possible unsafe locking scenario:

       CPU0
       ----
  lock(sched.start_work_mutex);
  lock(sched.start_work_mutex);

 *** DEADLOCK ***

 May be due to missing lock nesting notation

2 locks held by perf/23237:
 #0:  (sched.start_work_mutex){......}, at: ./perf() [0x419793]
 #1:  (sched.work_done_wait_mutex){......}, at: ./perf() [0x419793]

stack backtrace:
/usr/lib64/liblockdep.so(+0x1ba0)[0x7fa067f99ba0]
/usr/lib64/liblockdep.so(+0x37bf)[0x7fa067f9b7bf]
/usr/lib64/liblockdep.so(+0x3899)[0x7fa067f9b899]
/usr/lib64/liblockdep.so(+0x429a)[0x7fa067f9c29a]
/usr/lib64/liblockdep.so(+0x4db1)[0x7fa067f9cdb1]
/usr/lib64/liblockdep.so(lock_acquire+0x97)[0x7fa067f9d8b4]
./perf(cmd_sched+0xb166)[0x42d976]
./perf[0x419793]
./perf(main+0x529)[0x418f59]
/lib64/libc.so.6(__libc_start_main+0xed)[0x7fa063ae591d]
./perf[0x4190d9]

Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
---
 tools/perf/Makefile                 | 22 ++++++++++++++++++++++
 tools/perf/builtin-sched.c          |  6 ++++--
 tools/perf/builtin-top.c            |  4 ++++
 tools/perf/config/feature-tests.mak | 12 ++++++++++++
 tools/perf/perf.c                   |  3 +++
 tools/perf/ui/setup.c               |  5 ++++-
 tools/perf/util/hist.h              |  1 +
 tools/perf/util/liblockdep.h        | 11 +++++++++++
 tools/perf/util/util.h              |  1 +
 9 files changed, 62 insertions(+), 3 deletions(-)
 create mode 100644 tools/perf/util/liblockdep.h

diff --git a/tools/perf/Makefile b/tools/perf/Makefile
index 8ab05e5..994329d 100644
--- a/tools/perf/Makefile
+++ b/tools/perf/Makefile
@@ -572,6 +572,21 @@ ifneq ($(call try-cc,$(SOURCE_LIBUNWIND),$(FLAGS_UNWIND),libunwind),y)
 endif # Libunwind support
 endif # NO_LIBUNWIND
 
+ifndef NO_LIBLOCKDEP
+# for linking with liblockdep library, run like:
+# make DEBUG=1 LIBLOCK_DIR=/path/to/linux.git/tools/lib/lockdep/
+ifdef LIBLOCKDEP_DIR
+	LIBLOCKDEP_CFLAGS  := -I$(LIBLOCKDEP_DIR)/include -D__USE_LIBLOCKDEP
+	LIBLOCKDEP_LDFLAGS := -L$(LIBLOCKDEP_DIR)/ -llockdep
+endif
+
+FLAGS_LIBLOCKDEP=$(LIBLOCKDEP_CFLAGS) $(ALL_CFLAGS) $(LIBLOCKDEP_LDFLAGS) $(ALL_LDFLAGS) $(EXTLIBS)
+ifneq ($(call try-cc,$(SOURCE_LIBLOCKDEP),$(FLAGS_LIBLOCKDEP),liblockdep),y)
+	msg := $(warning No liblockdep found.);
+	NO_LIBLOCKDEP := 1
+endif # liblockdep support
+endif # NO_LIBLOCKDEP
+
 -include arch/$(ARCH)/Makefile
 
 ifneq ($(OUTPUT),)
@@ -621,6 +636,13 @@ ifndef NO_LIBUNWIND
 	LIB_OBJS += $(OUTPUT)util/unwind.o
 endif
 
+ifndef NO_LIBLOCKDEP
+	BASIC_CFLAGS += -D__USE_LIBLOCKDEP
+	EXTLIBS += $(LIBLOCKDEP_LIBS)
+	BASIC_CFLAGS := $(LIBLOCKDEP_CFLAGS) $(BASIC_CFLAGS)
+	BASIC_LDFLAGS := $(LIBLOCKDEP_LDFLAGS) $(BASIC_LDFLAGS)
+endif
+
 ifndef NO_LIBAUDIT
 	FLAGS_LIBAUDIT = $(ALL_CFLAGS) $(ALL_LDFLAGS) -laudit
 	ifneq ($(call try-cc,$(SOURCE_LIBAUDIT),$(FLAGS_LIBAUDIT),libaudit),y)
diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
index cc28b85..53d9225 100644
--- a/tools/perf/builtin-sched.c
+++ b/tools/perf/builtin-sched.c
@@ -468,6 +468,8 @@ static void *thread_func(void *ctx)
 	char comm2[22];
 	int fd;
 
+	liblockdep_set_thread();
+
 	free(parms);
 
 	sprintf(comm2, ":%s", this_task->comm);
@@ -1677,8 +1679,8 @@ int cmd_sched(int argc, const char **argv, const char *prefix __maybe_unused)
 		},
 		.cmp_pid	      = LIST_HEAD_INIT(sched.cmp_pid),
 		.sort_list	      = LIST_HEAD_INIT(sched.sort_list),
-		.start_work_mutex     = PTHREAD_MUTEX_INITIALIZER,
-		.work_done_wait_mutex = PTHREAD_MUTEX_INITIALIZER,
+		.start_work_mutex     = LIBLOCKDEP_PTHREAD_MUTEX_INITIALIZER(sched.start_work_mutex),
+		.work_done_wait_mutex = LIBLOCKDEP_PTHREAD_MUTEX_INITIALIZER(sched.work_done_wait_mutex),
 		.curr_pid	      = { [0 ... MAX_CPUS - 1] = -1 },
 		.sort_order	      = default_sort_order,
 		.replay_repeat	      = 10,
diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index c9ff395..c9b99ef 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -588,6 +588,8 @@ static void *display_thread_tui(void *arg)
 		.refresh	= top->delay_secs,
 	};
 
+	liblockdep_set_thread();
+
 	perf_top__sort_new_samples(top);
 
 	/*
@@ -613,6 +615,8 @@ static void *display_thread(void *arg)
 	struct perf_top *top = arg;
 	int delay_msecs, c;
 
+	liblockdep_set_thread();
+
 	tcgetattr(0, &save);
 	tc = save;
 	tc.c_lflag &= ~(ICANON | ECHO);
diff --git a/tools/perf/config/feature-tests.mak b/tools/perf/config/feature-tests.mak
index f5ac774..1f5a37e 100644
--- a/tools/perf/config/feature-tests.mak
+++ b/tools/perf/config/feature-tests.mak
@@ -217,6 +217,18 @@ int main(void)
 endef
 endif
 
+ifndef NO_LIBLOCKDEP
+define SOURCE_LIBLOCKDEP
+#include <liblockdep/mutex.h>
+
+int main(void)
+{
+	liblockdep_init();
+	return 0;
+}
+endef
+endif
+
 define SOURCE_ON_EXIT
 #include <stdio.h>
 
diff --git a/tools/perf/perf.c b/tools/perf/perf.c
index 0f661fb..ddbd315 100644
--- a/tools/perf/perf.c
+++ b/tools/perf/perf.c
@@ -446,6 +446,9 @@ int main(int argc, const char **argv)
 {
 	const char *cmd;
 
+	liblockdep_init();
+	liblockdep_set_thread();
+
 	page_size = sysconf(_SC_PAGE_SIZE);
 
 	cmd = perf_extract_argv0_path(argv[0]);
diff --git a/tools/perf/ui/setup.c b/tools/perf/ui/setup.c
index ebb4cc1..5c0cdeb 100644
--- a/tools/perf/ui/setup.c
+++ b/tools/perf/ui/setup.c
@@ -3,14 +3,17 @@
 #include "../util/cache.h"
 #include "../util/debug.h"
 #include "../util/hist.h"
+#include "../util/liblockdep.h"
 
-pthread_mutex_t ui__lock = PTHREAD_MUTEX_INITIALIZER;
+pthread_mutex_t ui__lock;
 
 void setup_browser(bool fallback_to_pager)
 {
 	if (!isatty(1) || dump_trace)
 		use_browser = 0;
 
+	pthread_mutex_init(&ui__lock, NULL);
+
 	/* default to TUI */
 	if (use_browser < 0)
 		use_browser = 1;
diff --git a/tools/perf/util/hist.h b/tools/perf/util/hist.h
index 8b091a5..328afe0 100644
--- a/tools/perf/util/hist.h
+++ b/tools/perf/util/hist.h
@@ -5,6 +5,7 @@
 #include <pthread.h>
 #include "callchain.h"
 #include "header.h"
+#include "liblockdep.h"
 
 extern struct callchain_param callchain_param;
 
diff --git a/tools/perf/util/liblockdep.h b/tools/perf/util/liblockdep.h
new file mode 100644
index 0000000..a996259
--- /dev/null
+++ b/tools/perf/util/liblockdep.h
@@ -0,0 +1,11 @@
+#ifdef __USE_LIBLOCKDEP
+
+#include <liblockdep/mutex.h>
+
+#else
+#error WHAT?!
+#define LIBLOCKDEP_PTHREAD_MUTEX_INITIALIZER(mtx) PTHREAD_MUTEX_INITIALIZER
+#define liblockdep_init()
+#define liblockdep_set_thread()
+
+#endif
diff --git a/tools/perf/util/util.h b/tools/perf/util/util.h
index c233091..06e6244 100644
--- a/tools/perf/util/util.h
+++ b/tools/perf/util/util.h
@@ -73,6 +73,7 @@
 #include <linux/magic.h>
 #include "types.h"
 #include <sys/ttydefaults.h>
+#include "liblockdep.h"
 
 extern const char *graph_line;
 extern const char *graph_dotted_line;
-- 
1.8.1.2


^ permalink raw reply related	[flat|nested] 4+ messages in thread
end of thread, other threads:[~2013-02-03 21:40 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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2013-02-01 17:15 [PATCH v2 7/7] perf: integrate liblockdep support into perf Sasha Levin
2013-02-03 11:05 ` Ingo Molnar
2013-02-03 21:39   ` Sasha Levin
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2013-02-01 16:47 [PATCH v2 1/7] liblockdep: wrap kernel/lockdep.c to allow usage from userspace Sasha Levin
2013-02-01 16:47 ` [PATCH v2 7/7] perf: integrate liblockdep support into perf Sasha Levin

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