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migration/dirtyrate: Fix precision losses and g_usleep overshoot

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Signed-off-by: Andrei Gudkov <gudkov.andrei@huawei.com>
Reviewed-by: Hyman Huang <yong.huang@smartx.com>
Message-Id: <8ddb0d40d143f77aab8f602bd494e01e5fa01614.1691161009.git.gudkov.andrei@huawei.com>
Signed-off-by: Hyman Huang <yong.huang@smartx.com>
This commit is contained in:
Andrei Gudkov 2023-08-28 20:55:57 +08:00 committed by Hyman Huang
parent 19b14cea45
commit 3eb82637fb
1 changed files with 8 additions and 2 deletions
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10
migration/dirtyrate.c
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@ -57,6 +57,8 @@ static int64_t dirty_stat_wait(int64_t msec, int64_t initial_time)
msec = current_time - initial_time;
} else {
g_usleep((msec + initial_time - current_time) * 1000);
/* g_usleep may overshoot */
msec = qemu_clock_get_ms(QEMU_CLOCK_REALTIME) - initial_time;
}
return msec;
@ -77,9 +79,13 @@ static int64_t do_calculate_dirtyrate(DirtyPageRecord dirty_pages,
{
uint64_t increased_dirty_pages =
dirty_pages.end_pages - dirty_pages.start_pages;
uint64_t memory_size_MiB = qemu_target_pages_to_MiB(increased_dirty_pages);
return memory_size_MiB * 1000 / calc_time_ms;
/*
* multiply by 1000ms/s _before_ converting down to megabytes
* to avoid losing precision
*/
return qemu_target_pages_to_MiB(increased_dirty_pages * 1000) /
calc_time_ms;
}
void global_dirty_log_change(unsigned int flag, bool start)