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x86, ptrace: use jiffies for BTS timestamps

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Replace sched_clock() with jiffies for BTS timestamps.

Signed-off-by: Markus Metzger <markus.t.metzger@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Markus Metzger 2008-01-30 13:31:20 +01:00 committed by Ingo Molnar
parent 2f4aaf53c2
commit 3c68904fee
3 changed files with 12 additions and 22 deletions
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28
arch/x86/kernel/ds.c
View file

@ -167,23 +167,13 @@ static inline void set_info_type(char *base, unsigned char value)
{ {
(*(unsigned char *)(base + ds_cfg.info_type.offset)) = value; (*(unsigned char *)(base + ds_cfg.info_type.offset)) = value;
} }
/* static inline unsigned long get_info_data(char *base)
* 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; return *(unsigned long *)(base + ds_cfg.info_data.offset);
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) static inline void set_info_data(char *base, unsigned long value)
{ {
memcpy(base + ds_cfg.info_data.offset, (*(unsigned long *)(base + ds_cfg.info_data.offset)) = value;
&value,
ds_cfg.info_data.size);
} }
@ -283,7 +273,7 @@ int ds_read_bts(void *ds, size_t index, struct bts_struct *out)
memset(out, 0, sizeof(*out)); memset(out, 0, sizeof(*out));
if (get_from_ip(bts) == BTS_ESCAPE_ADDRESS) { if (get_from_ip(bts) == BTS_ESCAPE_ADDRESS) {
out->qualifier = get_info_type(bts); out->qualifier = get_info_type(bts);
out->variant.timestamp = get_info_data(bts); out->variant.jiffies = get_info_data(bts);
} else { } else {
out->qualifier = BTS_BRANCH; out->qualifier = BTS_BRANCH;
out->variant.lbr.from_ip = get_from_ip(bts); out->variant.lbr.from_ip = get_from_ip(bts);
@ -319,7 +309,7 @@ int ds_write_bts(void *ds, const struct bts_struct *in)
case BTS_TASK_DEPARTS: case BTS_TASK_DEPARTS:
set_from_ip(bts, BTS_ESCAPE_ADDRESS); set_from_ip(bts, BTS_ESCAPE_ADDRESS);
set_info_type(bts, in->qualifier); set_info_type(bts, in->qualifier);
set_info_data(bts, in->variant.timestamp); set_info_data(bts, in->variant.jiffies);
break; break;
default: default:
@ -350,7 +340,7 @@ static const struct ds_configuration ds_cfg_netburst = {
.from_ip = { 0, 4 }, .from_ip = { 0, 4 },
.to_ip = { 4, 4 }, .to_ip = { 4, 4 },
.info_type = { 4, 1 }, .info_type = { 4, 1 },
.info_data = { 5, 7 }, .info_data = { 8, 4 },
.debugctl_mask = (1<<2)|(1<<3) .debugctl_mask = (1<<2)|(1<<3)
}; };
@ -364,7 +354,7 @@ static const struct ds_configuration ds_cfg_pentium_m = {
.from_ip = { 0, 4 }, .from_ip = { 0, 4 },
.to_ip = { 4, 4 }, .to_ip = { 4, 4 },
.info_type = { 4, 1 }, .info_type = { 4, 1 },
.info_data = { 5, 7 }, .info_data = { 8, 4 },
.debugctl_mask = (1<<6)|(1<<7) .debugctl_mask = (1<<6)|(1<<7)
}; };
#endif /* _i386_ */ #endif /* _i386_ */
@ -379,7 +369,7 @@ static const struct ds_configuration ds_cfg_core2 = {
.from_ip = { 0, 8 }, .from_ip = { 0, 8 },
.to_ip = { 8, 8 }, .to_ip = { 8, 8 },
.info_type = { 8, 1 }, .info_type = { 8, 1 },
.info_data = { 9, 7 }, .info_data = { 16, 8 },
.debugctl_mask = (1<<6)|(1<<7)|(1<<9) .debugctl_mask = (1<<6)|(1<<7)|(1<<9)
}; };

2
arch/x86/kernel/ptrace.c
View file

@ -616,7 +616,7 @@ void ptrace_bts_take_timestamp(struct task_struct *tsk,
{ {
struct bts_struct rec = { struct bts_struct rec = {
.qualifier = qualifier, .qualifier = qualifier,
.variant.timestamp = sched_clock() .variant.jiffies = jiffies
}; };
if (ptrace_bts_get_buffer_size(tsk) <= 0) if (ptrace_bts_get_buffer_size(tsk) <= 0)

2
include/asm-x86/ds.h
View file

@ -48,7 +48,7 @@ struct bts_struct {
} lbr; } lbr;
/* BTS_TASK_ARRIVES or /* BTS_TASK_ARRIVES or
BTS_TASK_DEPARTS */ BTS_TASK_DEPARTS */
unsigned long long timestamp; unsigned long jiffies;
} variant; } variant;
}; };