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Date: Fri, 14 Dec 2007 17:52:52 +0100
From: Markus Metzger <markus.t.metzger@...el.com>
To: ak@...e.de, hpa@...or.com, linux-kernel@...r.kernel.org,
mingo@...e.hu, tglx@...utronix.de
Cc: markus.t.metzger@...el.com, markus.t.metzger@...il.com,
suresh.b.siddha@...el.com, roland@...hat.com,
akpm@...ux-foundation.org, mtk.manpages@...il.com
Subject: [patch 2/5] x86, ptrace: use jiffies for BTS timestamps
Replace sched_clock() with jiffies for BTS timestamps.
Signed-off-by: Markus Metzger <markus.t.metzger@...el.com>
---
Index: linux-2.6-x86/arch/x86/kernel/ptrace.c
===================================================================
--- linux-2.6-x86.orig/arch/x86/kernel/ptrace.c 2007-12-10 09:47:57.%N +0100
+++ linux-2.6-x86/arch/x86/kernel/ptrace.c 2007-12-10 10:11:37.%N +0100
@@ -616,7 +616,7 @@
{
struct bts_struct rec = {
.qualifier = qualifier,
- .variant.timestamp = sched_clock()
+ .variant.jiffies = jiffies
};
if (ptrace_bts_get_buffer_size(tsk) <= 0)
Index: linux-2.6-x86/include/asm-x86/ds.h
===================================================================
--- linux-2.6-x86.orig/include/asm-x86/ds.h 2007-12-10 09:47:57.%N +0100
+++ linux-2.6-x86/include/asm-x86/ds.h 2007-12-10 10:11:37.%N +0100
@@ -48,7 +48,7 @@
} lbr;
/* BTS_TASK_ARRIVES or
BTS_TASK_DEPARTS */
- unsigned long long timestamp;
+ unsigned long jiffies;
} variant;
};
Index: linux-2.6-x86/arch/x86/kernel/ds.c
===================================================================
--- linux-2.6-x86.orig/arch/x86/kernel/ds.c 2007-12-10 09:13:55.%N +0100
+++ linux-2.6-x86/arch/x86/kernel/ds.c 2007-12-10 10:22:43.%N +0100
@@ -167,23 +167,13 @@
{
(*(unsigned char *)(base + ds_cfg.info_type.offset)) = value;
}
-/*
- * The info data might overlap with the info type on some architectures.
- * We therefore read and write the exact number of bytes.
- */
-static inline unsigned long long get_info_data(char *base)
-{
- unsigned long long value = 0;
- memcpy(&value,
- base + ds_cfg.info_data.offset,
- ds_cfg.info_data.size);
- return value;
-}
-static inline void set_info_data(char *base, unsigned long long value)
-{
- memcpy(base + ds_cfg.info_data.offset,
- &value,
- ds_cfg.info_data.size);
+static inline unsigned long get_info_data(char *base)
+{
+ return *(unsigned long *)(base + ds_cfg.info_data.offset);
+}
+static inline void set_info_data(char *base, unsigned long value)
+{
+ (*(unsigned long *)(base + ds_cfg.info_data.offset)) = value;
}
@@ -282,8 +272,8 @@
memset(out, 0, sizeof(*out));
if (get_from_ip(bts) == BTS_ESCAPE_ADDRESS) {
- out->qualifier = get_info_type(bts);
- out->variant.timestamp = get_info_data(bts);
+ out->qualifier = get_info_type(bts);
+ out->variant.jiffies = get_info_data(bts);
} else {
out->qualifier = BTS_BRANCH;
out->variant.lbr.from_ip = get_from_ip(bts);
@@ -319,7 +309,7 @@
case BTS_TASK_DEPARTS:
set_from_ip(bts, BTS_ESCAPE_ADDRESS);
set_info_type(bts, in->qualifier);
- set_info_data(bts, in->variant.timestamp);
+ set_info_data(bts, in->variant.jiffies);
break;
default:
@@ -350,7 +340,7 @@
.from_ip = { 0, 4 },
.to_ip = { 4, 4 },
.info_type = { 4, 1 },
- .info_data = { 5, 7 },
+ .info_data = { 8, 4 },
.debugctl_mask = (1<<2)|(1<<3)
};
@@ -364,7 +354,7 @@
.from_ip = { 0, 4 },
.to_ip = { 4, 4 },
.info_type = { 4, 1 },
- .info_data = { 5, 7 },
+ .info_data = { 8, 4 },
.debugctl_mask = (1<<6)|(1<<7)
};
#endif /* _i386_ */
@@ -379,7 +369,7 @@
.from_ip = { 0, 8 },
.to_ip = { 8, 8 },
.info_type = { 8, 1 },
- .info_data = { 9, 7 },
+ .info_data = { 16, 8 },
.debugctl_mask = (1<<6)|(1<<7)|(1<<9)
};
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