On 01/12/09 17:30, Matt Turner wrote:
Please take a look at the attached patch and let me know if it's what
you want pushed. I wasn't sure if the last hunk (the memory barriers)
needed to be included or had already been picked up.
All the tools/perf stuff, including the memory barriers, have been
picked up by linux-tip. Updated patch with the arch/alpha bits only
attached.
The patch should apply cleanly on top of the "alpha: Wire up missing/new
syscalls" patch which I see you have already applied.
Cheers
Michael.
>From 2c22c2a528d5c89f52d77b0d7a49c12865f82ecc Mon Sep 17 00:00:00 2001
From: Michael Cree <mcree@xxxxxxxxxxxx>
Date: Tue, 1 Dec 2009 22:15:17 +1300
Subject: [PATCH] alpha: Add minimal support for software performance events.
Enable configuration of the perf event option, add the perf_event_open
syscall, and include a minimal architecture specific asm/perf_event.h
header file.
Signed-off-by: Michael Cree <mcree@xxxxxxxxxxxx>
---
arch/alpha/Kconfig | 1 +
arch/alpha/include/asm/perf_event.h | 9 +++++++++
arch/alpha/include/asm/unistd.h | 3 ++-
arch/alpha/kernel/systbls.S | 1 +
4 files changed, 13 insertions(+), 1 deletions(-)
create mode 100644 arch/alpha/include/asm/perf_event.h
diff --git a/arch/alpha/Kconfig b/arch/alpha/Kconfig
index 4434481..bd7261e 100644
--- a/arch/alpha/Kconfig
+++ b/arch/alpha/Kconfig
@@ -9,6 +9,7 @@ config ALPHA
select HAVE_IDE
select HAVE_OPROFILE
select HAVE_SYSCALL_WRAPPERS
+ select HAVE_PERF_EVENTS
help
The Alpha is a 64-bit general-purpose processor designed and
marketed by the Digital Equipment Corporation of blessed memory,
diff --git a/arch/alpha/include/asm/perf_event.h b/arch/alpha/include/asm/perf_event.h
new file mode 100644
index 0000000..3bef852
--- /dev/null
+++ b/arch/alpha/include/asm/perf_event.h
@@ -0,0 +1,9 @@
+#ifndef __ASM_ALPHA_PERF_EVENT_H
+#define __ASM_ALPHA_PERF_EVENT_H
+
+/* Alpha only supports software events through this interface. */
+static inline void set_perf_event_pending(void) { }
+
+#define PERF_EVENT_INDEX_OFFSET 0
+
+#endif /* __ASM_ALPHA_PERF_EVENT_H */
diff --git a/arch/alpha/include/asm/unistd.h b/arch/alpha/include/asm/unistd.h
index 17f72b7..414de17 100644
--- a/arch/alpha/include/asm/unistd.h
+++ b/arch/alpha/include/asm/unistd.h
@@ -447,10 +447,11 @@
#define __NR_preadv 489
#define __NR_pwritev 490
#define __NR_rt_tgsigqueueinfo 491
+#define __NR_perf_event_open 492
#ifdef __KERNEL__
-#define NR_SYSCALLS 492
+#define NR_SYSCALLS 493
#define __ARCH_WANT_IPC_PARSE_VERSION
#define __ARCH_WANT_OLD_READDIR
diff --git a/arch/alpha/kernel/systbls.S b/arch/alpha/kernel/systbls.S
index 78199b9..63c78e4 100644
--- a/arch/alpha/kernel/systbls.S
+++ b/arch/alpha/kernel/systbls.S
@@ -510,6 +510,7 @@ sys_call_table:
.quad sys_preadv
.quad sys_pwritev /* 490 */
.quad sys_rt_tgsigqueueinfo
+ .quad sys_perf_event_open
.size sys_call_table, . - sys_call_table
.type sys_call_table, @object
--
1.5.6.5
