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migration/dirtyrate: move init step of calculation to main thread

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since main thread may "query dirty rate" at any time, it's better
to move init step into main thead so that synchronization overhead
between "main" and "get_dirtyrate" can be reduced.

Signed-off-by: Hyman Huang(黄勇) <huangy81@chinatelecom.cn>
Message-Id: <109f8077518ed2f13068e3bfb10e625e964780f1.1624040308.git.huangy81@chinatelecom.cn>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
Hyman Huang(黄勇) 2021-06-29 16:01:22 +00:00 committed by Juan Quintela
parent 15eb2d644c
commit 9865d0f68f
1 changed files with 5 additions and 4 deletions
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9
migration/dirtyrate.c
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@ -380,7 +380,6 @@ void *get_dirtyrate_thread(void *arg)
{
struct DirtyRateConfig config = *(struct DirtyRateConfig *)arg;
int ret;
int64_t start_time;
rcu_register_thread();
ret = dirtyrate_set_state(&CalculatingState, DIRTY_RATE_STATUS_UNSTARTED,
@ -390,9 +389,6 @@ void *get_dirtyrate_thread(void *arg)
return NULL;
}
start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME) / 1000;
init_dirtyrate_stat(start_time, config);
calculate_dirtyrate(config);
ret = dirtyrate_set_state(&CalculatingState, DIRTY_RATE_STATUS_MEASURING,
@ -411,6 +407,7 @@ void qmp_calc_dirty_rate(int64_t calc_time, bool has_sample_pages,
static struct DirtyRateConfig config;
QemuThread thread;
int ret;
int64_t start_time;
/*
* If the dirty rate is already being measured, don't attempt to start.
@ -451,6 +448,10 @@ void qmp_calc_dirty_rate(int64_t calc_time, bool has_sample_pages,
config.sample_period_seconds = calc_time;
config.sample_pages_per_gigabytes = sample_pages;
config.mode = DIRTY_RATE_MEASURE_MODE_PAGE_SAMPLING;
start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME) / 1000;
init_dirtyrate_stat(start_time, config);
qemu_thread_create(&thread, "get_dirtyrate", get_dirtyrate_thread,
(void *)&config, QEMU_THREAD_DETACHED);
}