6ef228fc0d
Make the code reusable. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
49 lines
1.2 KiB
C
49 lines
1.2 KiB
C
/*
|
|
* Ratelimiting calculations
|
|
*
|
|
* Copyright IBM, Corp. 2011
|
|
*
|
|
* Authors:
|
|
* Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
|
|
*
|
|
* This work is licensed under the terms of the GNU LGPL, version 2 or later.
|
|
* See the COPYING.LIB file in the top-level directory.
|
|
*
|
|
*/
|
|
|
|
#ifndef QEMU_RATELIMIT_H
|
|
#define QEMU_RATELIMIT_H 1
|
|
|
|
typedef struct {
|
|
int64_t next_slice_time;
|
|
uint64_t slice_quota;
|
|
uint64_t slice_ns;
|
|
uint64_t dispatched;
|
|
} RateLimit;
|
|
|
|
static inline int64_t ratelimit_calculate_delay(RateLimit *limit, uint64_t n)
|
|
{
|
|
int64_t now = qemu_get_clock_ns(rt_clock);
|
|
|
|
if (limit->next_slice_time < now) {
|
|
limit->next_slice_time = now + limit->slice_ns;
|
|
limit->dispatched = 0;
|
|
}
|
|
if (limit->dispatched == 0 || limit->dispatched + n <= limit->slice_quota) {
|
|
limit->dispatched += n;
|
|
return 0;
|
|
} else {
|
|
limit->dispatched = n;
|
|
return limit->next_slice_time - now;
|
|
}
|
|
}
|
|
|
|
static inline void ratelimit_set_speed(RateLimit *limit, uint64_t speed,
|
|
uint64_t slice_ns)
|
|
{
|
|
limit->slice_ns = slice_ns;
|
|
limit->slice_quota = ((double)speed * 1000000000ULL) / slice_ns;
|
|
}
|
|
|
|
#endif
|