clocksource: keep track of original clocksource frequency

The clocksource frequency is represented by
clocksource->mult/2^(clocksource->shift).  Currently, when NTP makes
adjustments to the clock frequency, they are made directly to the mult
value.

This has the drawback that once changed, we cannot know what the orignal
mult value was, or how much adjustment has been applied.

This property causes problems in calculating proper ntp intervals when
switching back and forth between clocksources.

This patch separates the current mult value into a mult and mult_orig
pair.  The mult_orig value stays constant, while the ntp clocksource
adjustments are done only to the mult value.

This allows for correct ntp interval calculation and additionally lays the
groundwork for a new notion of time, what I'm calling the monotonic-raw
time, which is introduced in a following patch.

Signed-off-by: John Stultz <johnstul@us.ibm.com>
Signed-off-by: Roman Zippel <zippel@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/include/linux/clocksource.h b/include/linux/clocksource.h
index 55e434feec993d9656ccf6bcd31964005daa9667..f0a7fb9844138132f8a22a4e5cc27e31b64ed3a4 100644 (file)
--- a/include/linux/clocksource.h
+++ b/include/linux/clocksource.h
@@ -45,7 +45,8 @@ struct clocksource;
  * @read:              returns a cycle value
  * @mask:              bitmask for two's complement
  *                     subtraction of non 64 bit counters
- * @mult:              cycle to nanosecond multiplier
+ * @mult:              cycle to nanosecond multiplier (adjusted by NTP)
+ * @mult_orig:         cycle to nanosecond multiplier (unadjusted by NTP)
  * @shift:             cycle to nanosecond divisor (power of two)
  * @flags:             flags describing special properties
  * @vread:             vsyscall based read
@@ -63,6 +64,7 @@ struct clocksource {
        cycle_t (*read)(void);
        cycle_t mask;
        u32 mult;
+       u32 mult_orig;
        u32 shift;
        unsigned long flags;
        cycle_t (*vread)(void);
@@ -201,16 +203,17 @@ static inline void clocksource_calculate_interval(struct clocksource *c,
 {
        u64 tmp;
 
-       /* XXX - All of this could use a whole lot of optimization */
+       /* Do the ns -> cycle conversion first, using original mult */
        tmp = length_nsec;
        tmp <<= c->shift;
-       tmp += c->mult/2;
-       do_div(tmp, c->mult);
+       tmp += c->mult_orig/2;
+       do_div(tmp, c->mult_orig);
 
        c->cycle_interval = (cycle_t)tmp;
        if (c->cycle_interval == 0)
                c->cycle_interval = 1;
 
+       /* Go back from cycles -> shifted ns, this time use ntp adjused mult */
        c->xtime_interval = (u64)c->cycle_interval * c->mult;
 }
 

diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c
index 093d4acf993b73fde0d575a4e29b06db88935942..9ed2eec97526546e26c4fb640702a8907b3530a9 100644 (file)
--- a/kernel/time/clocksource.c
+++ b/kernel/time/clocksource.c
@@ -325,6 +325,9 @@ int clocksource_register(struct clocksource *c)
        unsigned long flags;
        int ret;
 
+       /* save mult_orig on registration */
+       c->mult_orig = c->mult;
+
        spin_lock_irqsave(&clocksource_lock, flags);
        ret = clocksource_enqueue(c);
        if (!ret)

diff --git a/kernel/time/jiffies.c b/kernel/time/jiffies.c
index 4c256fdb8875b54f19e1c8062371c4b362cc5773..1ca99557e929261da5825325dafba49edde8be12 100644 (file)
--- a/kernel/time/jiffies.c
+++ b/kernel/time/jiffies.c
@@ -61,6 +61,7 @@ struct clocksource clocksource_jiffies = {
        .read           = jiffies_read,
        .mask           = 0xffffffff, /*32bits*/
        .mult           = NSEC_PER_JIFFY << JIFFIES_SHIFT, /* details above */
+       .mult_orig      = NSEC_PER_JIFFY << JIFFIES_SHIFT,
        .shift          = JIFFIES_SHIFT,
 };