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yaml
---
r: 99593
b: refs/heads/master
c: f3f3149
h: refs/heads/master
i:
  99591: 2b35fd5
v: v3
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Alok Kataria authored and Ingo Molnar committed Jun 24, 2008
1 parent 291305d commit 25f5065
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Showing 5 changed files with 23 additions and 21 deletions.
2 changes: 1 addition & 1 deletion [refs]
Original file line number Diff line number Diff line change
@@ -1,2 +1,2 @@
---
refs/heads/master: 6ff10de374cc68ff2024247793176dc8a1b317ea
refs/heads/master: f3f3149f35b9195ef4b761b1353fc0766b5f53be
2 changes: 1 addition & 1 deletion trunk/arch/x86/kernel/time_64.c
Original file line number Diff line number Diff line change
Expand Up @@ -123,7 +123,7 @@ void __init time_init(void)
(boot_cpu_data.x86_vendor == X86_VENDOR_AMD))
cpu_khz = calculate_cpu_khz();

lpj_tsc = ((unsigned long)tsc_khz * 1000)/HZ;
lpj_fine = ((unsigned long)tsc_khz * 1000)/HZ;

if (unsynchronized_tsc())
mark_tsc_unstable("TSCs unsynchronized");
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2 changes: 1 addition & 1 deletion trunk/arch/x86/kernel/tsc_32.c
Original file line number Diff line number Diff line change
Expand Up @@ -425,7 +425,7 @@ void __init tsc_init(void)

lpj = ((u64)tsc_khz * 1000);
do_div(lpj, HZ);
lpj_tsc = lpj;
lpj_fine = lpj;

printk("Detected %lu.%03lu MHz processor.\n",
(unsigned long)cpu_khz / 1000,
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2 changes: 1 addition & 1 deletion trunk/include/linux/delay.h
Original file line number Diff line number Diff line change
Expand Up @@ -41,7 +41,7 @@ static inline void ndelay(unsigned long x)
#define ndelay(x) ndelay(x)
#endif

extern unsigned long lpj_tsc;
extern unsigned long lpj_fine;
void calibrate_delay(void);
void msleep(unsigned int msecs);
unsigned long msleep_interruptible(unsigned int msecs);
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36 changes: 19 additions & 17 deletions trunk/init/calibrate.c
Original file line number Diff line number Diff line change
Expand Up @@ -10,7 +10,7 @@
#include <linux/timex.h>
#include <linux/smp.h>

unsigned long lpj_tsc;
unsigned long lpj_fine;
unsigned long preset_lpj;
static int __init lpj_setup(char *str)
{
Expand All @@ -35,9 +35,9 @@ static unsigned long __cpuinit calibrate_delay_direct(void)
unsigned long pre_start, start, post_start;
unsigned long pre_end, end, post_end;
unsigned long start_jiffies;
unsigned long tsc_rate_min, tsc_rate_max;
unsigned long good_tsc_sum = 0;
unsigned long good_tsc_count = 0;
unsigned long timer_rate_min, timer_rate_max;
unsigned long good_timer_sum = 0;
unsigned long good_timer_count = 0;
int i;

if (read_current_timer(&pre_start) < 0 )
Expand Down Expand Up @@ -81,22 +81,24 @@ static unsigned long __cpuinit calibrate_delay_direct(void)
}
read_current_timer(&post_end);

tsc_rate_max = (post_end - pre_start) / DELAY_CALIBRATION_TICKS;
tsc_rate_min = (pre_end - post_start) / DELAY_CALIBRATION_TICKS;
timer_rate_max = (post_end - pre_start) /
DELAY_CALIBRATION_TICKS;
timer_rate_min = (pre_end - post_start) /
DELAY_CALIBRATION_TICKS;

/*
* If the upper limit and lower limit of the tsc_rate is
* If the upper limit and lower limit of the timer_rate is
* >= 12.5% apart, redo calibration.
*/
if (pre_start != 0 && pre_end != 0 &&
(tsc_rate_max - tsc_rate_min) < (tsc_rate_max >> 3)) {
good_tsc_count++;
good_tsc_sum += tsc_rate_max;
(timer_rate_max - timer_rate_min) < (timer_rate_max >> 3)) {
good_timer_count++;
good_timer_sum += timer_rate_max;
}
}

if (good_tsc_count)
return (good_tsc_sum/good_tsc_count);
if (good_timer_count)
return (good_timer_sum/good_timer_count);

printk(KERN_WARNING "calibrate_delay_direct() failed to get a good "
"estimate for loops_per_jiffy.\nProbably due to long platform interrupts. Consider using \"lpj=\" boot option.\n");
Expand All @@ -111,8 +113,8 @@ static unsigned long __cpuinit calibrate_delay_direct(void) {return 0;}
* bit takes on average 1.5/HZ seconds. This (like the original) is a little
* better than 1%
* For the boot cpu we can skip the delay calibration and assign it a value
* calculated based on the tsc frequency.
* For the rest of the CPUs we cannot assume that the tsc frequency is same as
* calculated based on the timer frequency.
* For the rest of the CPUs we cannot assume that the timer frequency is same as
* the cpu frequency, hence do the calibration for those.
*/
#define LPS_PREC 8
Expand All @@ -126,11 +128,11 @@ void __cpuinit calibrate_delay(void)
loops_per_jiffy = preset_lpj;
printk(KERN_INFO
"Calibrating delay loop (skipped) preset value.. ");
} else if ((smp_processor_id() == 0) && lpj_tsc) {
loops_per_jiffy = lpj_tsc;
} else if ((smp_processor_id() == 0) && lpj_fine) {
loops_per_jiffy = lpj_fine;
printk(KERN_INFO
"Calibrating delay loop (skipped), "
"using tsc calculated value.. ");
"value calculated using timer frequency.. ");
} else if ((loops_per_jiffy = calibrate_delay_direct()) != 0) {
printk(KERN_INFO
"Calibrating delay using timer specific routine.. ");
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