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delayacct: Make accounting nanosecond based

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Kill the timespec juggling and calculate with plain nanoseconds.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: John Stultz <john.stultz@linaro.org>
This commit is contained in:
Thomas Gleixner 2014-07-16 21:04:35 +00:00 committed by John Stultz
parent ccbf62d8a2
commit 9667a23db0
2 changed files with 14 additions and 24 deletions
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4
include/linux/sched.h
View file

@ -813,7 +813,7 @@ struct task_delay_info {
* associated with the operation is added to XXX_delay.
* XXX_delay contains the accumulated delay time in nanoseconds.
*/
struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */
u64 blkio_start; /* Shared by blkio, swapin */
u64 blkio_delay; /* wait for sync block io completion */
u64 swapin_delay; /* wait for swapin block io completion */
u32 blkio_count; /* total count of the number of sync block */
@ -821,7 +821,7 @@ struct task_delay_info {
u32 swapin_count; /* total count of the number of swapin block */
/* io operations performed */
struct timespec freepages_start, freepages_end;
u64 freepages_start;
u64 freepages_delay; /* wait for memory reclaim */
u32 freepages_count; /* total count of memory reclaim */
};

34
kernel/delayacct.c
View file

@ -46,32 +46,25 @@ void __delayacct_tsk_init(struct task_struct *tsk)
}
/*
* Finish delay accounting for a statistic using
* its timestamps (@start, @end), accumalator (@total) and @count
* Finish delay accounting for a statistic using its timestamps (@start),
* accumalator (@total) and @count
*/
static void delayacct_end(struct timespec *start, struct timespec *end,
u64 *total, u32 *count)
static void delayacct_end(u64 *start, u64 *total, u32 *count)
{
struct timespec ts;
s64 ns;
s64 ns = ktime_get_ns() - *start;
unsigned long flags;
ktime_get_ts(end);
ts = timespec_sub(*end, *start);
ns = timespec_to_ns(&ts);
if (ns < 0)
return;
spin_lock_irqsave(&current->delays->lock, flags);
*total += ns;
(*count)++;
spin_unlock_irqrestore(&current->delays->lock, flags);
if (ns > 0) {
spin_lock_irqsave(&current->delays->lock, flags);
*total += ns;
(*count)++;
spin_unlock_irqrestore(&current->delays->lock, flags);
}
}
void __delayacct_blkio_start(void)
{
ktime_get_ts(&current->delays->blkio_start);
current->delays->blkio_start = ktime_get_ns();
}
void __delayacct_blkio_end(void)
@ -79,12 +72,10 @@ void __delayacct_blkio_end(void)
if (current->delays->flags & DELAYACCT_PF_SWAPIN)
/* Swapin block I/O */
delayacct_end(&current->delays->blkio_start,
&current->delays->blkio_end,
&current->delays->swapin_delay,
&current->delays->swapin_count);
else /* Other block I/O */
delayacct_end(&current->delays->blkio_start,
&current->delays->blkio_end,
&current->delays->blkio_delay,
&current->delays->blkio_count);
}
@ -159,13 +150,12 @@ __u64 __delayacct_blkio_ticks(struct task_struct *tsk)
void __delayacct_freepages_start(void)
{
ktime_get_ts(&current->delays->freepages_start);
current->delays->freepages_start = ktime_get_ns();
}
void __delayacct_freepages_end(void)
{
delayacct_end(&current->delays->freepages_start,
&current->delays->freepages_end,
&current->delays->freepages_delay,
&current->delays->freepages_count);
}