[patch-RFC 00/26] LTTng Kernel Trace Thread Flag

[patch-RFC 00/26] LTTng Kernel Trace Thread Flag

[Mathieu Desnoyers]

Hi,

This is an RFC for addition of a new thread flag, TIF_KERNEL_TRACE, to each
architecture to activate system-wide system call tracing.

This is needed by LTTng architecture dependent instrumentation.

It applies on 2.6.24-rc4-git3.

Mathieu

-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68

[patch-RFC 01/26] LTTng Kernel Trace Thread Flag Alpha

[Mathieu Desnoyers]

[-- Attachment #1: lttng-kernel-trace-thread-flag-alpha.patch --]
[-- Type: text/plain, Size: 1685 bytes --]

Add a thread flag to activate system-wide syscall tracing.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
---
 include/asm-alpha/thread_info.h |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

Index: linux-2.6-lttng/include/asm-alpha/thread_info.h
===================================================================
--- linux-2.6-lttng.orig/include/asm-alpha/thread_info.h	2007-11-13 09:25:26.000000000 -0500
+++ linux-2.6-lttng/include/asm-alpha/thread_info.h	2007-11-13 09:49:39.000000000 -0500
@@ -76,19 +76,21 @@ register struct thread_info *__current_t
 #define TIF_UAC_SIGBUS		7
 #define TIF_MEMDIE		8
 #define TIF_RESTORE_SIGMASK	9	/* restore signal mask in do_signal */
+#define TIF_KERNEL_TRACE	10	/* Kernel tracing of syscalls */
 
 #define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
 #define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
 #define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
 #define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
 #define _TIF_RESTORE_SIGMASK	(1<<TIF_RESTORE_SIGMASK)
+#define _TIF_KERNEL_TRACE	(1<<TIF_KERNEL_TRACE)
 
 /* Work to do on interrupt/exception return.  */
 #define _TIF_WORK_MASK		(_TIF_SIGPENDING | _TIF_NEED_RESCHED)
 
 /* Work to do on any return to userspace.  */
-#define _TIF_ALLWORK_MASK	(_TIF_WORK_MASK		\
-				 | _TIF_SYSCALL_TRACE)
+#define _TIF_ALLWORK_MASK	(_TIF_WORK_MASK				     \
+				 | _TIF_SYSCALL_TRACE | _TIF_KERNEL_TRACE)
 
 #define ALPHA_UAC_SHIFT		6
 #define ALPHA_UAC_MASK		(1 << TIF_UAC_NOPRINT | 1 << TIF_UAC_NOFIX | \

-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68

[patch-RFC 02/26] LTTng Kernel Trace Thread Flag ARM

[Mathieu Desnoyers]

[-- Attachment #1: lttng-kernel-trace-thread-flag-arm.patch --]
[-- Type: text/plain, Size: 1613 bytes --]

Add a thread flag to activate system-wide syscall tracing.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
---
 include/asm-arm/thread_info.h |    3 +++
 1 file changed, 3 insertions(+)

Index: linux-2.6-lttng/include/asm-arm/thread_info.h
===================================================================
--- linux-2.6-lttng.orig/include/asm-arm/thread_info.h	2007-09-04 11:50:11.000000000 -0400
+++ linux-2.6-lttng/include/asm-arm/thread_info.h	2007-09-04 12:19:51.000000000 -0400
@@ -134,6 +134,7 @@ extern void iwmmxt_task_switch(struct th
 /*
  * thread information flags:
  *  TIF_SYSCALL_TRACE	- syscall trace active
+ *  TIF_KERNEL_TRACE	- kernel trace active
  *  TIF_SIGPENDING	- signal pending
  *  TIF_NEED_RESCHED	- rescheduling necessary
  *  TIF_USEDFPU		- FPU was used by this task this quantum (SMP)
@@ -141,6 +142,7 @@ extern void iwmmxt_task_switch(struct th
  */
 #define TIF_SIGPENDING		0
 #define TIF_NEED_RESCHED	1
+#define TIF_KERNEL_TRACE	7
 #define TIF_SYSCALL_TRACE	8
 #define TIF_POLLING_NRFLAG	16
 #define TIF_USING_IWMMXT	17
@@ -149,6 +151,7 @@ extern void iwmmxt_task_switch(struct th
 
 #define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
 #define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
+#define _TIF_KERNEL_TRACE	(1 << TIF_KERNEL_TRACE)
 #define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
 #define _TIF_POLLING_NRFLAG	(1 << TIF_POLLING_NRFLAG)
 #define _TIF_USING_IWMMXT	(1 << TIF_USING_IWMMXT)

-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68

[patch-RFC 03/26] LTTng Kernel Trace Thread Flag AVR32

[Mathieu Desnoyers]

[-- Attachment #1: lttng-kernel-trace-thread-flag-avr32.patch --]
[-- Type: text/plain, Size: 1726 bytes --]

Add a thread flag to activate system-wide syscall tracing.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
---
 include/asm-avr32/thread_info.h |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

Index: linux-2.6-lttng/include/asm-avr32/thread_info.h
===================================================================
--- linux-2.6-lttng.orig/include/asm-avr32/thread_info.h	2007-07-30 18:49:43.000000000 -0400
+++ linux-2.6-lttng/include/asm-avr32/thread_info.h	2007-07-30 18:59:15.000000000 -0400
@@ -83,6 +83,7 @@ static inline struct thread_info *curren
 #define TIF_MEMDIE		6
 #define TIF_RESTORE_SIGMASK	7	/* restore signal mask in do_signal */
 #define TIF_CPU_GOING_TO_SLEEP	8	/* CPU is entering sleep 0 mode */
+#define TIF_KERNEL_TRACE        9       /* kernel trace active */
 #define TIF_USERSPACE		31      /* true if FS sets userspace */
 
 #define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
@@ -94,12 +95,13 @@ static inline struct thread_info *curren
 #define _TIF_MEMDIE		(1 << TIF_MEMDIE)
 #define _TIF_RESTORE_SIGMASK	(1 << TIF_RESTORE_SIGMASK)
 #define _TIF_CPU_GOING_TO_SLEEP (1 << TIF_CPU_GOING_TO_SLEEP)
+#define _TIF_KERNEL_TRACE	(1 << TIF_KERNEL_TRACE)
 
 /* XXX: These two masks must never span more than 16 bits! */
 /* work to do on interrupt/exception return */
 #define _TIF_WORK_MASK		0x0000013e
 /* work to do on any return to userspace */
-#define _TIF_ALLWORK_MASK	0x0000013f
+#define _TIF_ALLWORK_MASK	0x0000033f
 /* work to do on return from debug mode */
 #define _TIF_DBGWORK_MASK	0x0000017e
 

-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68

[patch-RFC 04/26] LTTng Kernel Trace Thread Flag Blackfin

[Mathieu Desnoyers]

[-- Attachment #1: lttng-kernel-trace-thread-flag-blackfin.patch --]
[-- Type: text/plain, Size: 1553 bytes --]

Add a thread flag to activate system-wide syscall tracing.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
---
 include/asm-blackfin/thread_info.h |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

Index: linux-2.6-lttng/include/asm-blackfin/thread_info.h
===================================================================
--- linux-2.6-lttng.orig/include/asm-blackfin/thread_info.h	2007-07-30 18:49:43.000000000 -0400
+++ linux-2.6-lttng/include/asm-blackfin/thread_info.h	2007-07-30 19:01:13.000000000 -0400
@@ -125,6 +125,7 @@ static inline struct thread_info *curren
 #define TIF_MEMDIE              4
 #define TIF_RESTORE_SIGMASK	5	/* restore signal mask in do_signal() */
 #define TIF_FREEZE              6       /* is freezing for suspend */
+#define TIF_KERNEL_TRACE	7	/* kernel trace active */
 
 /* as above, but as bit values */
 #define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
@@ -133,8 +134,9 @@ static inline struct thread_info *curren
 #define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
 #define _TIF_RESTORE_SIGMASK	(1<<TIF_RESTORE_SIGMASK)
 #define _TIF_FREEZE             (1<<TIF_FREEZE)
+#define _TIF_KERNEL_TRACE	(1<<TIF_KERNEL_TRACE)
 
-#define _TIF_WORK_MASK		0x0000FFFE	/* work to do on interrupt/exception return */
+#define _TIF_WORK_MASK		0x0000FF7E	/* work to do on interrupt/exception return */
 
 #endif				/* __KERNEL__ */
 

-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68

[patch-RFC 05/26] LTTng Kernel Trace Thread Flag Cris

[Mathieu Desnoyers]

[-- Attachment #1: lttng-kernel-trace-thread-flag-cris.patch --]
[-- Type: text/plain, Size: 1896 bytes --]

Add a thread flag to activate system-wide syscall tracing.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
---
 include/asm-cris/thread_info.h |    9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

Index: linux-2.6-lttng/include/asm-cris/thread_info.h
===================================================================
--- linux-2.6-lttng.orig/include/asm-cris/thread_info.h	2007-11-15 21:18:41.000000000 -0500
+++ linux-2.6-lttng/include/asm-cris/thread_info.h	2007-11-15 21:32:07.000000000 -0500
@@ -83,6 +83,7 @@ struct thread_info {
 #define TIF_NOTIFY_RESUME	1	/* resumption notification requested */
 #define TIF_SIGPENDING		2	/* signal pending */
 #define TIF_NEED_RESCHED	3	/* rescheduling necessary */
+#define TIF_KERNEL_TRACE	4	/* kernel trace active */
 #define TIF_RESTORE_SIGMASK	9	/* restore signal mask in do_signal() */
 #define TIF_POLLING_NRFLAG	16	/* true if poll_idle() is polling TIF_NEED_RESCHED */
 #define TIF_MEMDIE		17
@@ -91,11 +92,15 @@ struct thread_info {
 #define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
 #define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
 #define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
+#define _TIF_KERNEL_TRACE	(1<<TIF_KERNEL_TRACE)
 #define _TIF_RESTORE_SIGMASK	(1<<TIF_RESTORE_SIGMASK)
 #define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
 
-#define _TIF_WORK_MASK		0x0000FFFE	/* work to do on interrupt/exception return */
-#define _TIF_ALLWORK_MASK	0x0000FFFF	/* work to do on any return to u-space */
+/* work to do on interrupt/exception return */
+#define _TIF_WORK_MASK		0x0000FFFF & \
+		(~_TIF_SYSCALL_TRACE | ~_TIF_KERNEL_TRACE)
+/* work to do on any return to u-space */
+#define _TIF_ALLWORK_MASK	0x0000FFFF
 
 #endif /* __KERNEL__ */
 

-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68

[patch-RFC 06/26] LTTng Kernel Trace Thread Flag Frv

[Mathieu Desnoyers]

[-- Attachment #1: lttng-kernel-trace-thread-flag-frv.patch --]
[-- Type: text/plain, Size: 1787 bytes --]

Add a thread flag to activate system-wide syscall tracing.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
---
 include/asm-frv/thread_info.h |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

Index: linux-2.6-lttng/include/asm-frv/thread_info.h
===================================================================
--- linux-2.6-lttng.orig/include/asm-frv/thread_info.h	2007-09-04 11:52:56.000000000 -0400
+++ linux-2.6-lttng/include/asm-frv/thread_info.h	2007-09-04 12:19:57.000000000 -0400
@@ -112,6 +112,7 @@ register struct thread_info *__current_t
 #define TIF_SINGLESTEP		3	/* restore singlestep on return to user mode */
 #define TIF_IRET		4	/* return with iret */
 #define TIF_RESTORE_SIGMASK	5	/* restore signal mask in do_signal() */
+#define TIF_KERNEL_TRACE	6	/* kernel trace active */
 #define TIF_POLLING_NRFLAG	16	/* true if poll_idle() is polling TIF_NEED_RESCHED */
 #define TIF_MEMDIE		17	/* OOM killer killed process */
 #define TIF_FREEZE		18	/* freezing for suspend */
@@ -122,10 +123,11 @@ register struct thread_info *__current_t
 #define _TIF_SINGLESTEP		(1 << TIF_SINGLESTEP)
 #define _TIF_IRET		(1 << TIF_IRET)
 #define _TIF_RESTORE_SIGMASK	(1 << TIF_RESTORE_SIGMASK)
+#define _TIF_KERNEL_TRACE	(1 << TIF_KERNEL_TRACE)
 #define _TIF_POLLING_NRFLAG	(1 << TIF_POLLING_NRFLAG)
 #define _TIF_FREEZE		(1 << TIF_FREEZE)
 
-#define _TIF_WORK_MASK		0x0000FFFE	/* work to do on interrupt/exception return */
+#define _TIF_WORK_MASK		0x0000FFBE	/* work to do on interrupt/exception return */
 #define _TIF_ALLWORK_MASK	0x0000FFFF	/* work to do on any return to u-space */
 
 /*

-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68

[patch-RFC 07/26] LTTng Kernel Trace Thread Flag H8300

[Mathieu Desnoyers]

[-- Attachment #1: lttng-kernel-trace-thread-flag-h8300.patch --]
[-- Type: text/plain, Size: 1481 bytes --]

Add a thread flag to activate system-wide syscall tracing.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
---
 include/asm-h8300/thread_info.h |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

Index: linux-2.6-lttng/include/asm-h8300/thread_info.h
===================================================================
--- linux-2.6-lttng.orig/include/asm-h8300/thread_info.h	2007-08-07 11:03:21.000000000 -0400
+++ linux-2.6-lttng/include/asm-h8300/thread_info.h	2007-08-07 11:47:27.000000000 -0400
@@ -92,6 +92,7 @@ static inline struct thread_info *curren
 					   TIF_NEED_RESCHED */
 #define TIF_MEMDIE		4
 #define TIF_RESTORE_SIGMASK	5	/* restore signal mask in do_signal() */
+#define TIF_KERNEL_TRACE	6	/* kernel trace active */
 
 /* as above, but as bit values */
 #define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
@@ -99,8 +100,9 @@ static inline struct thread_info *curren
 #define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
 #define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
 #define _TIF_RESTORE_SIGMASK	(1<<TIF_RESTORE_SIGMASK)
+#define _TIF_KERNEL_TRACE	(1<<TIF_KERNEL_TRACE)
 
-#define _TIF_WORK_MASK		0x0000FFFE	/* work to do on interrupt/exception return */
+#define _TIF_WORK_MASK		0x0000FFBE	/* work to do on interrupt/exception return */
 
 #endif /* __KERNEL__ */
 

-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68

[patch-RFC 08/26] LTTng Linux Kernel Trace Thread Flags x86_32

[Mathieu Desnoyers]

[-- Attachment #1: lttng-kernel-trace-thread-flag-i386.patch --]
[-- Type: text/plain, Size: 2016 bytes --]

Add a thread flag to activate system-wide syscall tracing.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
CC: Thomas Gleixner <tglx@linutronix.de>
CC: Ingo Molnar <mingo@redhat.com>
CC: H. Peter Anvin <hpa@zytor.com>
---
 include/asm-i386/thread_info.h |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

Index: linux-2.6-lttng/include/asm-x86/thread_info_32.h
===================================================================
--- linux-2.6-lttng.orig/include/asm-x86/thread_info_32.h	2007-07-30 19:41:44.000000000 -0400
+++ linux-2.6-lttng/include/asm-x86/thread_info_32.h	2007-07-30 20:07:03.000000000 -0400
@@ -132,6 +132,7 @@ static inline struct thread_info *curren
 #define TIF_SYSCALL_AUDIT	6	/* syscall auditing active */
 #define TIF_SECCOMP		7	/* secure computing */
 #define TIF_RESTORE_SIGMASK	8	/* restore signal mask in do_signal() */
+#define TIF_KERNEL_TRACE	9	/* kernel trace active */
 #define TIF_MEMDIE		16
 #define TIF_DEBUG		17	/* uses debug registers */
 #define TIF_IO_BITMAP		18	/* uses I/O bitmap */
@@ -147,6 +148,7 @@ static inline struct thread_info *curren
 #define _TIF_SYSCALL_AUDIT	(1<<TIF_SYSCALL_AUDIT)
 #define _TIF_SECCOMP		(1<<TIF_SECCOMP)
 #define _TIF_RESTORE_SIGMASK	(1<<TIF_RESTORE_SIGMASK)
+#define _TIF_KERNEL_TRACE	(1<<TIF_KERNEL_TRACE)
 #define _TIF_DEBUG		(1<<TIF_DEBUG)
 #define _TIF_IO_BITMAP		(1<<TIF_IO_BITMAP)
 #define _TIF_FREEZE		(1<<TIF_FREEZE)
@@ -154,7 +156,7 @@ static inline struct thread_info *curren
 
 /* work to do on interrupt/exception return */
 #define _TIF_WORK_MASK \
-  (0x0000FFFF & ~(_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
+  (0x0000FFFF & ~(_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | _TIF_KERNEL_TRACE |\
 		  _TIF_SECCOMP | _TIF_SYSCALL_EMU))
 /* work to do on any return to u-space */
 #define _TIF_ALLWORK_MASK	(0x0000FFFF & ~_TIF_SECCOMP)

-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68

[patch-RFC 09/26] LTTng Kernel Trace Thread Flag ia64

[Mathieu Desnoyers]

[-- Attachment #1: lttng-kernel-trace-thread-flag-ia64.patch --]
[-- Type: text/plain, Size: 3131 bytes --]

Add a thread flag to activate system-wide syscall tracing.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
---
 arch/ia64/kernel/entry.S       |    6 ++++--
 include/asm-ia64/thread_info.h |   13 +++++++++----
 2 files changed, 13 insertions(+), 6 deletions(-)

Index: linux-2.6-lttng/include/asm-ia64/thread_info.h
===================================================================
--- linux-2.6-lttng.orig/include/asm-ia64/thread_info.h	2007-11-20 10:43:04.000000000 -0500
+++ linux-2.6-lttng/include/asm-ia64/thread_info.h	2007-11-20 10:43:28.000000000 -0500
@@ -86,6 +86,7 @@
 #define TIF_SINGLESTEP		4	/* restore singlestep on return to user mode */
 #define TIF_RESTORE_SIGMASK	5	/* restore signal mask in do_signal() */
 #define TIF_PERFMON_WORK	6	/* work for pfm_handle_work() */
+#define TIF_KERNEL_TRACE	7	/* kernel trace active */
 #define TIF_POLLING_NRFLAG	16	/* true if poll_idle() is polling TIF_NEED_RESCHED */
 #define TIF_MEMDIE		17
 #define TIF_MCA_INIT		18	/* this task is processing MCA or INIT */
@@ -95,7 +96,8 @@
 #define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
 #define _TIF_SYSCALL_AUDIT	(1 << TIF_SYSCALL_AUDIT)
 #define _TIF_SINGLESTEP		(1 << TIF_SINGLESTEP)
-#define _TIF_SYSCALL_TRACEAUDIT	(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SINGLESTEP)
+#define _TIF_KERNEL_TRACE	(1 << TIF_KERNEL_TRACE)
+#define _TIF_SYSCALL_TRACEAUDIT	(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SINGLESTEP|_TIF_KERNEL_TRACE)
 #define _TIF_RESTORE_SIGMASK	(1 << TIF_RESTORE_SIGMASK)
 #define _TIF_PERFMON_WORK	(1 << TIF_PERFMON_WORK)
 #define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
@@ -108,9 +110,12 @@
 /* "work to do on user-return" bits */
 #define TIF_ALLWORK_MASK	(_TIF_SIGPENDING|_TIF_PERFMON_WORK|_TIF_SYSCALL_AUDIT|\
 				 _TIF_NEED_RESCHED| _TIF_SYSCALL_TRACE|\
-				 _TIF_RESTORE_SIGMASK)
-/* like TIF_ALLWORK_BITS but sans TIF_SYSCALL_TRACE or TIF_SYSCALL_AUDIT */
-#define TIF_WORK_MASK		(TIF_ALLWORK_MASK&~(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT))
+				 _TIF_RESTORE_SIGMASK|_TIF_KERNEL_TRACE)
+/*
+ * like TIF_ALLWORK_BITS but sans TIF_SYSCALL_TRACE, TIF_KERNEL_TRACE
+ * or TIF_SYSCALL_AUDIT
+ */
+#define TIF_WORK_MASK		(TIF_ALLWORK_MASK&~(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_KERNEL_TRACE))
 
 #define TS_POLLING		1 	/* true if in idle loop and not sleeping */
 
Index: linux-2.6-lttng/arch/ia64/kernel/entry.S
===================================================================
--- linux-2.6-lttng.orig/arch/ia64/kernel/entry.S	2007-11-20 10:43:04.000000000 -0500
+++ linux-2.6-lttng/arch/ia64/kernel/entry.S	2007-11-20 10:50:48.000000000 -0500
@@ -621,9 +621,11 @@
 	;;
 	ld4 r2=[r2]
 	;;
+	movl r8=_TIF_SYSCALL_TRACEAUDIT
+	;;					// added stop bits to prevent r8 dependency
+	and r2=r8,r2
 	mov r8=0
-	and r2=_TIF_SYSCALL_TRACEAUDIT,r2
-	;;
+	;;					// added stop bits to prevent r2 dependency
 	cmp.ne p6,p0=r2,r0
 (p6)	br.cond.spnt .strace_check_retval
 	;;					// added stop bits to prevent r8 dependency

-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68

[patch-RFC 10/26] LTTng Kernel Trace Thread Flag m32r

[Mathieu Desnoyers]

[-- Attachment #1: lttng-kernel-trace-thread-flag-m32r.patch --]
[-- Type: text/plain, Size: 2062 bytes --]

Add a thread flag to activate system-wide syscall tracing.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
---
 include/asm-m32r/thread_info.h |    9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

Index: linux-2.6-lttng/include/asm-m32r/thread_info.h
===================================================================
--- linux-2.6-lttng.orig/include/asm-m32r/thread_info.h	2007-11-28 08:40:56.000000000 -0500
+++ linux-2.6-lttng/include/asm-m32r/thread_info.h	2007-11-28 08:47:42.000000000 -0500
@@ -149,6 +149,7 @@ static inline unsigned int get_thread_fa
 #define TIF_NEED_RESCHED	2	/* rescheduling necessary */
 #define TIF_SINGLESTEP		3	/* restore singlestep on return to user mode */
 #define TIF_IRET		4	/* return with iret */
+#define TIF_KERNEL_TRACE	5	/* kernel trace active */
 #define TIF_RESTORE_SIGMASK	8	/* restore signal mask in do_signal() */
 #define TIF_USEDFPU		16	/* FPU was used by this task this quantum (SMP) */
 #define TIF_POLLING_NRFLAG	17	/* true if poll_idle() is polling TIF_NEED_RESCHED */
@@ -160,13 +161,17 @@ static inline unsigned int get_thread_fa
 #define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
 #define _TIF_SINGLESTEP		(1<<TIF_SINGLESTEP)
 #define _TIF_IRET		(1<<TIF_IRET)
+#define _TIF_KERNEL_TRACE	(1<<TIF_KERNEL_TRACE)
 #define _TIF_RESTORE_SIGMASK	(1<<TIF_RESTORE_SIGMASK)
 #define _TIF_USEDFPU		(1<<TIF_USEDFPU)
 #define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
 #define _TIF_FREEZE		(1<<TIF_FREEZE)
 
-#define _TIF_WORK_MASK		0x0000FFFE	/* work to do on interrupt/exception return */
-#define _TIF_ALLWORK_MASK	0x0000FFFF	/* work to do on any return to u-space */
+/* work to do on any return to u-space */
+#define _TIF_ALLWORK_MASK	0x0000FFFF
+/* work to do on interrupt/exception return */
+#define _TIF_WORK_MASK \
+	(0x0000FFFF & ~(_TIF_SYSCALL_TRACE | _TIF_KERNEL_TRACE))
 
 /*
  * Thread-synchronous status.

-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68

[patch-RFC 11/26] LTTng Kernel Trace Thread Flag m68k

[Mathieu Desnoyers]

[-- Attachment #1: lttng-kernel-trace-thread-flag-m68k.patch --]
[-- Type: text/plain, Size: 1013 bytes --]

Add a thread flag to activate system-wide syscall tracing.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
---
 include/asm-m68k/thread_info.h |    1 +
 1 file changed, 1 insertion(+)

Index: linux-2.6-lttng/include/asm-m68k/thread_info.h
===================================================================
--- linux-2.6-lttng.orig/include/asm-m68k/thread_info.h	2007-07-30 18:14:49.000000000 -0400
+++ linux-2.6-lttng/include/asm-m68k/thread_info.h	2007-07-30 18:15:23.000000000 -0400
@@ -55,6 +55,7 @@ struct thread_info {
  */
 #define TIF_SIGPENDING		6	/* signal pending */
 #define TIF_NEED_RESCHED	7	/* rescheduling necessary */
+#define TIF_KERNEL_TRACE	13	/* kernel trace active */
 #define TIF_DELAYED_TRACE	14	/* single step a syscall */
 #define TIF_SYSCALL_TRACE	15	/* syscall trace active */
 #define TIF_MEMDIE		16

-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68

[patch-RFC 12/26] LTTng Kernel Trace Thread Flag m68knommu

[Mathieu Desnoyers]

[-- Attachment #1: lttng-kernel-trace-thread-flag-m68knommu.patch --]
[-- Type: text/plain, Size: 1422 bytes --]

Add a thread flag to activate system-wide syscall tracing.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
---
 include/asm-m68knommu/thread_info.h |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

Index: linux-2.6-lttng/include/asm-m68knommu/thread_info.h
===================================================================
--- linux-2.6-lttng.orig/include/asm-m68knommu/thread_info.h	2007-07-30 18:49:42.000000000 -0400
+++ linux-2.6-lttng/include/asm-m68knommu/thread_info.h	2007-07-30 19:08:02.000000000 -0400
@@ -88,14 +88,16 @@ static inline struct thread_info *curren
 #define TIF_POLLING_NRFLAG	3	/* true if poll_idle() is polling
 					   TIF_NEED_RESCHED */
 #define TIF_MEMDIE		4
+#define TIF_KERNEL_TRACE	5	/* kernel trace active */
 
 /* as above, but as bit values */
 #define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
 #define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
 #define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
 #define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
+#define _TIF_KERNEL_TRACE	(1<<TIF_KERNEL_TRACE)
 
-#define _TIF_WORK_MASK		0x0000FFFE	/* work to do on interrupt/exception return */
+#define _TIF_WORK_MASK		0x0000FFDE	/* work to do on interrupt/exception return */
 
 #endif /* __KERNEL__ */
 

-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68

[patch-RFC 13/26] LTTng Kernel Trace Thread Flag MIPS

[Mathieu Desnoyers]

[-- Attachment #1: lttng-kernel-trace-thread-flag-mips.patch --]
[-- Type: text/plain, Size: 1646 bytes --]

Add a thread flag to activate system-wide syscall tracing.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
---
 include/asm-mips/thread_info.h |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

Index: linux-2.6-lttng/include/asm-mips/thread_info.h
===================================================================
--- linux-2.6-lttng.orig/include/asm-mips/thread_info.h	2007-08-09 15:19:01.000000000 -0400
+++ linux-2.6-lttng/include/asm-mips/thread_info.h	2007-08-09 15:28:15.000000000 -0400
@@ -122,9 +122,11 @@ register struct thread_info *__current_t
 #define TIF_32BIT_REGS		22	/* also implies 16/32 fprs */
 #define TIF_32BIT_ADDR		23	/* 32-bit address space (o32/n32) */
 #define TIF_FPUBOUND		24	/* thread bound to FPU-full CPU set */
+#define TIF_KERNEL_TRACE	30	/* kernel trace active */
 #define TIF_SYSCALL_TRACE	31	/* syscall trace active */
 
 #define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
+#define _TIF_KERNEL_TRACE	(1<<TIF_KERNEL_TRACE)
 #define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
 #define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
 #define _TIF_SYSCALL_AUDIT	(1<<TIF_SYSCALL_AUDIT)
@@ -142,7 +144,7 @@ register struct thread_info *__current_t
 /* work to do on interrupt/exception return */
 #define _TIF_WORK_MASK		(0x0000ffef & ~_TIF_SECCOMP)
 /* work to do on any return to u-space */
-#define _TIF_ALLWORK_MASK	(0x8000ffff & ~_TIF_SECCOMP)
+#define _TIF_ALLWORK_MASK	(0xc000ffff & ~_TIF_SECCOMP)
 
 #endif /* __KERNEL__ */
 

-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68

[patch-RFC 14/26] LTTng Kernel Trace Thread Flag parisc

[Mathieu Desnoyers]

[-- Attachment #1: lttng-kernel-trace-thread-flag-parisc.patch --]
[-- Type: text/plain, Size: 1395 bytes --]

Add a thread flag to activate system-wide syscall tracing.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
---
 include/asm-parisc/thread_info.h |    2 ++
 1 file changed, 2 insertions(+)

Index: linux-2.6-lttng/include/asm-parisc/thread_info.h
===================================================================
--- linux-2.6-lttng.orig/include/asm-parisc/thread_info.h	2007-07-30 18:18:19.000000000 -0400
+++ linux-2.6-lttng/include/asm-parisc/thread_info.h	2007-07-30 18:18:48.000000000 -0400
@@ -62,6 +62,7 @@ struct thread_info {
 #define TIF_32BIT               4       /* 32 bit binary */
 #define TIF_MEMDIE		5
 #define TIF_RESTORE_SIGMASK	6	/* restore saved signal mask */
+#define TIF_KERNEL_TRACE	7	/* kernel trace active */
 
 #define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
 #define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
@@ -69,6 +70,7 @@ struct thread_info {
 #define _TIF_POLLING_NRFLAG	(1 << TIF_POLLING_NRFLAG)
 #define _TIF_32BIT		(1 << TIF_32BIT)
 #define _TIF_RESTORE_SIGMASK	(1 << TIF_RESTORE_SIGMASK)
+#define _TIF_KERNEL_TRACE	(1 << TIF_KERNEL_TRACE)
 
 #define _TIF_USER_WORK_MASK     (_TIF_SIGPENDING | \
                                  _TIF_NEED_RESCHED | _TIF_RESTORE_SIGMASK)

-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68

[patch-RFC 15/26] LTTng Kernel Trace Thread Flag powerpc

[Mathieu Desnoyers]

[-- Attachment #1: lttng-kernel-trace-thread-flag-powerpc.patch --]
[-- Type: text/plain, Size: 2535 bytes --]

Add a thread flag to activate system-wide syscall tracing.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
---
 include/asm-powerpc/thread_info.h |    8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

Index: linux-2.6-lttng/include/asm-powerpc/thread_info.h
===================================================================
--- linux-2.6-lttng.orig/include/asm-powerpc/thread_info.h	2007-08-10 17:21:52.000000000 -0400
+++ linux-2.6-lttng/include/asm-powerpc/thread_info.h	2007-08-10 18:26:46.000000000 -0400
@@ -112,7 +112,7 @@ static inline struct thread_info *curren
 #define TIF_POLLING_NRFLAG	3	/* true if poll_idle() is polling
 					   TIF_NEED_RESCHED */
 #define TIF_32BIT		4	/* 32 bit binary */
-#define TIF_PERFMON_WORK	5	/* work for pfm_handle_work() */
+#define TIF_KERNEL_TRACE	5	/* kernel trace active */
 #define TIF_PERFMON_CTXSW	6	/* perfmon needs ctxsw calls */
 #define TIF_SYSCALL_AUDIT	7	/* syscall auditing active */
 #define TIF_SINGLESTEP		8	/* singlestepping active */
@@ -124,6 +124,7 @@ static inline struct thread_info *curren
 #define TIF_FREEZE		14	/* Freezing for suspend */
 #define TIF_RUNLATCH		15	/* Is the runlatch enabled? */
 #define TIF_ABI_PENDING		16	/* 32/64 bit switch needed */
+#define TIF_PERFMON_WORK	17	/* work for pfm_handle_work() */
 
 /* as above, but as bit values */
 #define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
@@ -131,7 +132,7 @@ static inline struct thread_info *curren
 #define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
 #define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
 #define _TIF_32BIT		(1<<TIF_32BIT)
-#define _TIF_PERFMON_WORK	(1<<TIF_PERFMON_WORK)
+#define _TIF_KERNEL_TRACE	(1<<TIF_KERNEL_TRACE)
 #define _TIF_PERFMON_CTXSW	(1<<TIF_PERFMON_CTXSW)
 #define _TIF_SYSCALL_AUDIT	(1<<TIF_SYSCALL_AUDIT)
 #define _TIF_SINGLESTEP		(1<<TIF_SINGLESTEP)
@@ -142,7 +143,8 @@ static inline struct thread_info *curren
 #define _TIF_FREEZE		(1<<TIF_FREEZE)
 #define _TIF_RUNLATCH		(1<<TIF_RUNLATCH)
 #define _TIF_ABI_PENDING	(1<<TIF_ABI_PENDING)
-#define _TIF_SYSCALL_T_OR_A	(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SECCOMP)
+#define _TIF_PERFMON_WORK	(1<<TIF_PERFMON_WORK)
+#define _TIF_SYSCALL_T_OR_A	(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SECCOMP|_TIF_KERNEL_TRACE)
 
 #define _TIF_USER_WORK_MASK	( _TIF_SIGPENDING | \
 				 _TIF_NEED_RESCHED | _TIF_RESTORE_SIGMASK)

-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68

[patch-RFC 16/26] LTTng Kernel Trace Thread Flag s390

[Mathieu Desnoyers]

[-- Attachment #1: lttng-kernel-trace-thread-flag-s390.patch --]
[-- Type: text/plain, Size: 1516 bytes --]

Add a thread flag to activate system-wide syscall tracing.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
---
 arch/s390/kernel/entry.S       |    5 ++++-
 include/asm-s390/thread_info.h |    2 ++
 2 files changed, 6 insertions(+), 1 deletion(-)

Index: linux-2.6-lttng/include/asm-s390/thread_info.h
===================================================================
--- linux-2.6-lttng.orig/include/asm-s390/thread_info.h	2007-11-20 13:10:50.000000000 -0500
+++ linux-2.6-lttng/include/asm-s390/thread_info.h	2007-11-20 13:12:20.000000000 -0500
@@ -96,6 +96,7 @@
 #define TIF_SYSCALL_AUDIT	5	/* syscall auditing active */
 #define TIF_SINGLE_STEP		6	/* deliver sigtrap on return to user */
 #define TIF_MCCK_PENDING	7	/* machine check handling is pending */
+#define TIF_KERNEL_TRACE	8	/* kernel trace active */
 #define TIF_USEDFPU		16	/* FPU was used by this task this quantum (SMP) */
 #define TIF_POLLING_NRFLAG	17	/* true if poll_idle() is polling 
 					   TIF_NEED_RESCHED */
@@ -110,6 +111,7 @@
 #define _TIF_SYSCALL_AUDIT	(1<<TIF_SYSCALL_AUDIT)
 #define _TIF_SINGLE_STEP	(1<<TIF_SINGLE_STEP)
 #define _TIF_MCCK_PENDING	(1<<TIF_MCCK_PENDING)
+#define _TIF_KERNEL_TRACE	(1<<TIF_KERNEL_TRACE)
 #define _TIF_USEDFPU		(1<<TIF_USEDFPU)
 #define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
 #define _TIF_31BIT		(1<<TIF_31BIT)

-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68

[patch-RFC 17/26] LTTng Kernel Trace Thread Flag SH

[Mathieu Desnoyers]

[-- Attachment #1: lttng-kernel-trace-thread-flag-sh.patch --]
[-- Type: text/plain, Size: 1833 bytes --]

Add a thread flag to activate system-wide syscall tracing.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
---
 include/asm-sh/thread_info.h |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

Index: linux-2.6-lttng/include/asm-sh/thread_info.h
===================================================================
--- linux-2.6-lttng.orig/include/asm-sh/thread_info.h	2007-07-30 18:46:17.000000000 -0400
+++ linux-2.6-lttng/include/asm-sh/thread_info.h	2007-07-30 19:11:39.000000000 -0400
@@ -111,6 +111,7 @@ static inline struct thread_info *curren
 #define TIF_NEED_RESCHED	2	/* rescheduling necessary */
 #define TIF_RESTORE_SIGMASK	3	/* restore signal mask in do_signal() */
 #define TIF_SINGLESTEP		4	/* singlestepping active */
+#define TIF_KERNEL_TRACE	5	/* kernel trace active */
 #define TIF_USEDFPU		16	/* FPU was used by this task this quantum (SMP) */
 #define TIF_POLLING_NRFLAG	17	/* true if poll_idle() is polling TIF_NEED_RESCHED */
 #define TIF_MEMDIE		18
@@ -121,11 +122,12 @@ static inline struct thread_info *curren
 #define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
 #define _TIF_RESTORE_SIGMASK	(1<<TIF_RESTORE_SIGMASK)
 #define _TIF_SINGLESTEP		(1<<TIF_SINGLESTEP)
+#define _TIF_KERNEL_TRACE	(1<<TIF_KERNEL_TRACE)
 #define _TIF_USEDFPU		(1<<TIF_USEDFPU)
 #define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
 #define _TIF_FREEZE		(1<<TIF_FREEZE)
 
-#define _TIF_WORK_MASK		0x000000FE	/* work to do on interrupt/exception return */
+#define _TIF_WORK_MASK		0x000000DE	/* work to do on interrupt/exception return */
 #define _TIF_ALLWORK_MASK	0x000000FF	/* work to do on any return to u-space */
 
 #endif /* __KERNEL__ */

-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68

[patch-RFC 18/26] LTTng Kernel Trace Thread Flag sh64

[Mathieu Desnoyers]

[-- Attachment #1: lttng-kernel-trace-thread-flag-sh64.patch --]
[-- Type: text/plain, Size: 1280 bytes --]

Add a thread flag to activate system-wide syscall tracing.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
---
 include/asm-sh64/thread_info.h |    2 ++
 1 file changed, 2 insertions(+)

Index: linux-2.6-lttng/include/asm-sh64/thread_info.h
===================================================================
--- linux-2.6-lttng.orig/include/asm-sh64/thread_info.h	2007-07-30 18:23:10.000000000 -0400
+++ linux-2.6-lttng/include/asm-sh64/thread_info.h	2007-07-30 18:23:34.000000000 -0400
@@ -75,11 +75,13 @@ static inline struct thread_info *curren
 
 /* thread information flags */
 #define TIF_SYSCALL_TRACE	0	/* syscall trace active */
+#define TIF_KERNEL_TRACE	1	/* kernel trace active */
 #define TIF_SIGPENDING		2	/* signal pending */
 #define TIF_NEED_RESCHED	3	/* rescheduling necessary */
 #define TIF_MEMDIE		4
 #define TIF_RESTORE_SIGMASK	5	/* Restore signal mask in do_signal */
 
+#define _TIF_KERNEL_TRACE	(1 << TIF_KERNEL_TRACE)
 #define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
 #define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
 #define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)

-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68

[patch-RFC 19/26] LTTng Kernel Trace Thread Flag sparc

[Mathieu Desnoyers]

[-- Attachment #1: lttng-kernel-trace-thread-flag-sparc.patch --]
[-- Type: text/plain, Size: 1464 bytes --]

Add a thread flag to activate system-wide syscall tracing.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
---
 include/asm-sparc/thread_info.h |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

Index: linux-2.6-lttng/include/asm-sparc/thread_info.h
===================================================================
--- linux-2.6-lttng.orig/include/asm-sparc/thread_info.h	2007-07-30 18:23:47.000000000 -0400
+++ linux-2.6-lttng/include/asm-sparc/thread_info.h	2007-07-30 18:24:06.000000000 -0400
@@ -128,7 +128,7 @@ BTFIXUPDEF_CALL(void, free_thread_info, 
  * thread information flag bit numbers
  */
 #define TIF_SYSCALL_TRACE	0	/* syscall trace active */
-/* flag bit 1 is available */
+#define TIF_KERNEL_TRACE	1	/* kernel trace active */
 #define TIF_SIGPENDING		2	/* signal pending */
 #define TIF_NEED_RESCHED	3	/* rescheduling necessary */
 #define TIF_RESTORE_SIGMASK	4	/* restore signal mask in do_signal() */
@@ -140,6 +140,7 @@ BTFIXUPDEF_CALL(void, free_thread_info, 
 
 /* as above, but as bit values */
 #define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
+#define _TIF_KERNEL_TRACE	(1<<TIF_KERNEL_TRACE)
 #define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
 #define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
 #define _TIF_RESTORE_SIGMASK	(1<<TIF_RESTORE_SIGMASK)

-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68

[patch-RFC 20/26] LTTng Kernel Trace Thread Flag sparc64

[Mathieu Desnoyers]

[-- Attachment #1: lttng-kernel-trace-thread-flag-sparc64.patch --]
[-- Type: text/plain, Size: 1531 bytes --]

Add a thread flag to activate system-wide syscall tracing.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
---
 include/asm-sparc64/thread_info.h |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

Index: linux-2.6-lttng/include/asm-sparc64/thread_info.h
===================================================================
--- linux-2.6-lttng.orig/include/asm-sparc64/thread_info.h	2007-07-30 18:24:15.000000000 -0400
+++ linux-2.6-lttng/include/asm-sparc64/thread_info.h	2007-07-30 18:25:43.000000000 -0400
@@ -225,7 +225,7 @@ register struct thread_info *current_thr
 #define TIF_UNALIGNED		5	/* allowed to do unaligned accesses */
 #define TIF_NEWSIGNALS		6	/* wants new-style signals */
 #define TIF_32BIT		7	/* 32-bit binary */
-/* flag bit 8 is available */
+#define TIF_KERNEL_TRACE	8	/* kernel trace active */
 #define TIF_SECCOMP		9	/* secure computing */
 #define TIF_SYSCALL_AUDIT	10	/* syscall auditing active */
 /* flag bit 11 is available */
@@ -244,6 +244,7 @@ register struct thread_info *current_thr
 #define _TIF_UNALIGNED		(1<<TIF_UNALIGNED)
 #define _TIF_NEWSIGNALS		(1<<TIF_NEWSIGNALS)
 #define _TIF_32BIT		(1<<TIF_32BIT)
+#define _TIF_KERNEL_TRACE	(1<<TIF_KERNEL_TRACE)
 #define _TIF_SECCOMP		(1<<TIF_SECCOMP)
 #define _TIF_SYSCALL_AUDIT	(1<<TIF_SYSCALL_AUDIT)
 #define _TIF_RESTORE_SIGMASK	(1<<TIF_RESTORE_SIGMASK)

-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68

[patch-RFC 21/26] LTTng Kernel Trace Thread Flag UML

[Mathieu Desnoyers]

[-- Attachment #1: lttng-kernel-trace-thread-flag-um.patch --]
[-- Type: text/plain, Size: 1234 bytes --]

Add a thread flag to activate system-wide syscall tracing.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
---
 include/asm-um/thread_info.h |    2 ++
 1 file changed, 2 insertions(+)

Index: linux-2.6-lttng/include/asm-um/thread_info.h
===================================================================
--- linux-2.6-lttng.orig/include/asm-um/thread_info.h	2007-07-30 18:26:11.000000000 -0400
+++ linux-2.6-lttng/include/asm-um/thread_info.h	2007-07-30 18:26:39.000000000 -0400
@@ -82,6 +82,7 @@ static inline struct thread_info *curren
 #define TIF_MEMDIE	 	5
 #define TIF_SYSCALL_AUDIT	6
 #define TIF_RESTORE_SIGMASK	7
+#define TIF_KERNEL_TRACE	8	/* kernel trace active */
 
 #define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
 #define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
@@ -90,5 +91,6 @@ static inline struct thread_info *curren
 #define _TIF_MEMDIE		(1 << TIF_MEMDIE)
 #define _TIF_SYSCALL_AUDIT	(1 << TIF_SYSCALL_AUDIT)
 #define _TIF_RESTORE_SIGMASK	(1 << TIF_RESTORE_SIGMASK)
+#define _TIF_KERNEL_TRACE	(1 << TIF_KERNEL_TRACE)
 
 #endif

-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68

[patch-RFC 22/26] LTTng Kernel Trace Thread Flag v850

[Mathieu Desnoyers]

[-- Attachment #1: lttng-kernel-trace-thread-flag-v850.patch --]
[-- Type: text/plain, Size: 1219 bytes --]

Add a thread flag to activate system-wide syscall tracing.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
---
 include/asm-v850/thread_info.h |    2 ++
 1 file changed, 2 insertions(+)

Index: linux-2.6-lttng/include/asm-v850/thread_info.h
===================================================================
--- linux-2.6-lttng.orig/include/asm-v850/thread_info.h	2007-07-30 18:26:48.000000000 -0400
+++ linux-2.6-lttng/include/asm-v850/thread_info.h	2007-07-30 18:27:19.000000000 -0400
@@ -82,12 +82,14 @@ struct thread_info {
 #define TIF_POLLING_NRFLAG	3	/* true if poll_idle() is polling
 					   TIF_NEED_RESCHED */
 #define TIF_MEMDIE		4
+#define TIF_KERNEL_TRACE	5	/* kernel trace active */
 
 /* as above, but as bit values */
 #define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
 #define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
 #define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
 #define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
+#define _TIF_KERNEL_TRACE	(1<<TIF_KERNEL_TRACE)
 
 
 /* Size of kernel stack for each process.  */

-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68

[patch-RFC 23/26] Prepare x86_64 for TIF_SYSCALL_TRACE async flag set in entry.S

[Mathieu Desnoyers]

[-- Attachment #1: fix-x86_64-sysenter-trace-race.patch --]
[-- Type: text/plain, Size: 1845 bytes --]

When the flag is inactive upon syscall entry and concurrently activated before
exit, we seem to reach a state where the top of stack is incorrect upon return
to user space.

Fix this by fixing the top of stack and jumping to int_ret_from_sys_call if we
detect that thread flags has been modified.

We make sure that the thread flag read is coherent between our new test and the ALLWORK_MASK test by first saving it in a register used for both comparisons.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
CC: Andi Kleen <ak@muc.de>
CC: Thomas Gleixner <tglx@linutronix.de>
CC: Ingo Molnar <mingo@redhat.com>
CC: H. Peter Anvin <hpa@zytor.com>
---
 arch/x86/kernel/entry_64.S |   12 ++++++++++++
 1 file changed, 12 insertions(+)

Index: linux-2.6-lttng/arch/x86/kernel/entry_64.S
===================================================================
--- linux-2.6-lttng.orig/arch/x86/kernel/entry_64.S	2007-11-13 09:25:25.000000000 -0500
+++ linux-2.6-lttng/arch/x86/kernel/entry_64.S	2007-11-13 09:49:48.000000000 -0500
@@ -268,6 +268,8 @@ sysret_check:		
 	/* Handle reschedules */
 	/* edx:	work, edi: workmask */	
 sysret_careful:
+	testl $(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SECCOMP),%edx
+	jnz ret_from_sys_call_trace
 	bt $TIF_NEED_RESCHED,%edx
 	jnc sysret_signal
 	TRACE_IRQS_ON
@@ -279,6 +281,16 @@ sysret_careful:
 	CFI_ADJUST_CFA_OFFSET -8
 	jmp sysret_check
 
+ret_from_sys_call_trace:
+	TRACE_IRQS_ON
+	sti
+	SAVE_REST
+	FIXUP_TOP_OF_STACK %rdi
+	movq %rsp,%rdi
+	LOAD_ARGS ARGOFFSET  /* reload args from stack in case ptrace changed it */
+	RESTORE_REST
+	jmp int_ret_from_sys_call
+
 	/* Handle a signal */ 
 sysret_signal:
 	TRACE_IRQS_ON

-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68

[patch-RFC 24/26] LTTng Linux Kernel Trace Thread Flag x86_64

[Mathieu Desnoyers]

[-- Attachment #1: lttng-kernel-trace-thread-flag-x86_64.patch --]
[-- Type: text/plain, Size: 2000 bytes --]

Add a thread flag to activate system-wide syscall tracing.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
CC: Thomas Gleixner <tglx@linutronix.de>
CC: Ingo Molnar <mingo@redhat.com>
CC: H. Peter Anvin <hpa@zytor.com>
---
 include/asm-x86/thread_info_64.h |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

Index: linux-2.6-lttng/include/asm-x86/thread_info_64.h
===================================================================
--- linux-2.6-lttng.orig/include/asm-x86/thread_info_64.h	2007-11-02 11:06:22.000000000 -0400
+++ linux-2.6-lttng/include/asm-x86/thread_info_64.h	2007-11-02 12:02:57.000000000 -0400
@@ -107,6 +107,7 @@ static inline struct thread_info *stack_
  * Warning: layout of LSW is hardcoded in entry.S
  */
 #define TIF_SYSCALL_TRACE	0	/* syscall trace active */
+#define TIF_KERNEL_TRACE	1	/* kernel trace active */
 #define TIF_SIGPENDING		2	/* signal pending */
 #define TIF_NEED_RESCHED	3	/* rescheduling necessary */
 #define TIF_SINGLESTEP		4	/* reenable singlestep on user return*/
@@ -125,6 +126,7 @@ static inline struct thread_info *stack_
 #define TIF_FREEZE		23	/* is freezing for suspend */
 
 #define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
+#define _TIF_KERNEL_TRACE	(1<<TIF_KERNEL_TRACE)
 #define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
 #define _TIF_SINGLESTEP		(1<<TIF_SINGLESTEP)
 #define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
@@ -142,7 +144,7 @@ static inline struct thread_info *stack_
 
 /* work to do on interrupt/exception return */
 #define _TIF_WORK_MASK \
-  (0x0000FFFF & ~(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SINGLESTEP|_TIF_SECCOMP))
+  (0x0000FFFF & ~(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_KERNEL_TRACE|_TIF_SINGLESTEP|_TIF_SECCOMP))
 /* work to do on any return to user space */
 #define _TIF_ALLWORK_MASK (0x0000FFFF & ~_TIF_SECCOMP)
 

-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68

[patch-RFC 25/26] LTTng Kernel Trace Thread Flag xtensa

[Mathieu Desnoyers]

[-- Attachment #1: lttng-kernel-trace-thread-flag-xtensa.patch --]
[-- Type: text/plain, Size: 1692 bytes --]

Add a thread flag to activate system-wide syscall tracing.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
---
 include/asm-xtensa/thread_info.h |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

Index: linux-2.6-lttng/include/asm-xtensa/thread_info.h
===================================================================
--- linux-2.6-lttng.orig/include/asm-xtensa/thread_info.h	2007-09-04 11:50:18.000000000 -0400
+++ linux-2.6-lttng/include/asm-xtensa/thread_info.h	2007-09-04 12:20:19.000000000 -0400
@@ -116,6 +116,7 @@ static inline struct thread_info *curren
 #define TIF_IRET		4	/* return with iret */
 #define TIF_MEMDIE		5
 #define TIF_RESTORE_SIGMASK	6	/* restore signal mask in do_signal() */
+#define TIF_KERNEL_TRACE	7	/* kernel trace active */
 #define TIF_POLLING_NRFLAG	16	/* true if poll_idle() is polling TIF_NEED_RESCHED */
 
 #define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
@@ -123,10 +124,11 @@ static inline struct thread_info *curren
 #define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
 #define _TIF_SINGLESTEP		(1<<TIF_SINGLESTEP)
 #define _TIF_IRET		(1<<TIF_IRET)
+#define _TIF_KERNEL_TRACE	(1<<TIF_KERNEL_TRACE)
 #define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
 #define _TIF_RESTORE_SIGMASK	(1<<TIF_RESTORE_SIGMASK)
 
-#define _TIF_WORK_MASK		0x0000FFFE	/* work to do on interrupt/exception return */
+#define _TIF_WORK_MASK		0x0000FF7E	/* work to do on interrupt/exception return */
 #define _TIF_ALLWORK_MASK	0x0000FFFF	/* work to do on any return to u-space */
 
 /*

-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68

[patch-RFC 26/26] LTTng Kernel Trace Thread Flag API

[Mathieu Desnoyers]

[-- Attachment #1: lttng-kernel-trace-thread-flag-api.patch --]
[-- Type: text/plain, Size: 4058 bytes --]

Add an API to set/clear the kernel wide tracing thread flags. Implemented in
kernel/sched.c. Updates thread flags *asynchronously* while holding the tasklist
lock.

Upon fork, the flag must be re-copied while the tasklist lock is held.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
---
 include/linux/sched.h |    3 ++
 kernel/fork.c         |    9 ++++++++
 kernel/sched.c        |   55 ++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 67 insertions(+)

Index: linux-2.6-lttng/include/linux/sched.h
===================================================================
--- linux-2.6-lttng.orig/include/linux/sched.h	2007-12-05 20:50:29.000000000 -0500
+++ linux-2.6-lttng/include/linux/sched.h	2007-12-05 20:54:32.000000000 -0500
@@ -2000,6 +2000,9 @@ static inline void migration_init(void)
 }
 #endif
 
+extern void clear_kernel_trace_flag_all_tasks(void);
+extern void set_kernel_trace_flag_all_tasks(void);
+
 #endif /* __KERNEL__ */
 
 #endif
Index: linux-2.6-lttng/kernel/fork.c
===================================================================
--- linux-2.6-lttng.orig/kernel/fork.c	2007-12-05 20:54:00.000000000 -0500
+++ linux-2.6-lttng/kernel/fork.c	2007-12-05 20:54:32.000000000 -0500
@@ -1241,6 +1241,15 @@ static struct task_struct *copy_process(
 			!cpu_online(task_cpu(p))))
 		set_task_cpu(p, smp_processor_id());
 
+	/*
+	 * The state of the parent's TIF_KTRACE flag may have changed
+	 * since it was copied in dup_task_struct() so we re-copy it here.
+	 */
+	if (test_thread_flag(TIF_KERNEL_TRACE))
+		set_tsk_thread_flag(p, TIF_KERNEL_TRACE);
+	else
+		clear_tsk_thread_flag(p, TIF_KERNEL_TRACE);
+
 	/* CLONE_PARENT re-uses the old parent */
 	if (clone_flags & (CLONE_PARENT|CLONE_THREAD))
 		p->real_parent = current->real_parent;
Index: linux-2.6-lttng/kernel/sched.c
===================================================================
--- linux-2.6-lttng.orig/kernel/sched.c	2007-12-05 20:54:00.000000000 -0500
+++ linux-2.6-lttng/kernel/sched.c	2007-12-05 20:54:32.000000000 -0500
@@ -7394,3 +7394,58 @@ struct cgroup_subsys cpuacct_subsys = {
 	.subsys_id = cpuacct_subsys_id,
 };
 #endif	/* CONFIG_CGROUP_CPUACCT */
+
+static DEFINE_MUTEX(kernel_trace_mutex);
+static int kernel_trace_refcount;
+
+/**
+ * clear_kernel_trace_flag_all_tasks - clears all TIF_KERNEL_TRACE thread flags.
+ *
+ * This function iterates on all threads in the system to clear their
+ * TIF_KERNEL_TRACE flag. Setting the TIF_KERNEL_TRACE flag with the
+ * tasklist_lock held in copy_process() makes sure that once we finish clearing
+ * the thread flags, all threads have their flags cleared.
+ */
+void clear_kernel_trace_flag_all_tasks(void)
+{
+	struct task_struct *p;
+	struct task_struct *t;
+
+	mutex_lock(&kernel_trace_mutex);
+	if (--kernel_trace_refcount)
+		goto end;
+	read_lock(&tasklist_lock);
+	do_each_thread(p, t) {
+		clear_tsk_thread_flag(t, TIF_KERNEL_TRACE);
+	} while_each_thread(p, t);
+	read_unlock(&tasklist_lock);
+end:
+	mutex_unlock(&kernel_trace_mutex);
+}
+EXPORT_SYMBOL_GPL(clear_kernel_trace_flag_all_tasks);
+
+/**
+ * set_kernel_trace_flag_all_tasks - sets all TIF_KERNEL_TRACE thread flags.
+ *
+ * This function iterates on all threads in the system to set their
+ * TIF_KERNEL_TRACE flag. Setting the TIF_KERNEL_TRACE flag with the
+ * tasklist_lock held in copy_process() makes sure that once we finish setting
+ * the thread flags, all threads have their flags set.
+ */
+void set_kernel_trace_flag_all_tasks(void)
+{
+	struct task_struct *p;
+	struct task_struct *t;
+
+	mutex_lock(&kernel_trace_mutex);
+	if (kernel_trace_refcount++)
+		goto end;
+	read_lock(&tasklist_lock);
+	do_each_thread(p, t) {
+		set_tsk_thread_flag(t, TIF_KERNEL_TRACE);
+	} while_each_thread(p, t);
+	read_unlock(&tasklist_lock);
+end:
+	mutex_unlock(&kernel_trace_mutex);
+}
+EXPORT_SYMBOL_GPL(set_kernel_trace_flag_all_tasks);

-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68

Re: [patch-RFC 00/26] LTTng Kernel Trace Thread Flag

[Frank Ch. Eigler]

Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> writes:

> This is an RFC for addition of a new thread flag, TIF_KERNEL_TRACE, to each
> architecture to activate system-wide system call tracing.
> [...]

Instead of creating a new flag, could you overload TIF_SYSCALL_TRACE,
putting the marker into syscall_trace(), and letting !PT_TRACED cause
a skip over the ptrace notification logic?

- FChE

Re: [patch-RFC 00/26] LTTng Kernel Trace Thread Flag

[Mathieu Desnoyers]

* Frank Ch. Eigler (fche@redhat.com) wrote:
> Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> writes:
> 
> > This is an RFC for addition of a new thread flag, TIF_KERNEL_TRACE, to each
> > architecture to activate system-wide system call tracing.
> > [...]
> 
> Instead of creating a new flag, could you overload TIF_SYSCALL_TRACE,
> putting the marker into syscall_trace(), and letting !PT_TRACED cause
> a skip over the ptrace notification logic?
> 
> - FChE

I don't see any PT_TRACED flag in current kernel HEAD ?

Hrm, let's see. If we share TIF_SYSCALL_TRACE with ptrace, we would then
have to figure out how to get this working :

- kernel tracing activated
- ptracing some random processes
- kernel tracing deactivated
- stop ptracing those processes

It means that we would have to keep some state information about the
ptrace status of each process. This is currently kept by
TIF_SYSCALL_TRACE, but since we would be overloading it, it would be
lost when we deactivate kernel tracing. Adding a supplementary field to
the thread_info structure is out of question here : we have to keep it
as small as possible. So where do you propose to keep this information
other than... another thread flag ?

Mathieu


-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68