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lib/event: Factor out the main polling loop from _spdk_reactor_run()

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It was too difficult for us to add unit test for _spdk_reactor_run()
because the main polling loop in _spdk_reactor_run() was infinite
if g_reactor_state is SPDK_REACTOR_STATE_RUNNING.

Factor out the main polling loop and rusage update in _spdk_reactor_run()
into a helper function reactor_run().

This improves the code readability as well.

Signed-off-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Change-Id: Ia26db14f44026fefd696443227c16d2be4166832
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/1186
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Aleksey Marchuk <alexeymar@mellanox.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Paul Luse <paul.e.luse@intel.com>
This commit is contained in:
Shuhei Matsumoto 2020-03-08 20:52:09 -04:00 committed by Tomasz Zawadzki
parent 68161ffc00
commit fbb77a56c8
1 changed files with 41 additions and 33 deletions
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74
lib/event/reactor.c
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@ -308,6 +308,46 @@ _set_thread_name(const char *thread_name)
static int _reactor_schedule_thread(struct spdk_thread *thread);
static uint64_t g_rusage_period;
static void
reactor_run(struct spdk_reactor *reactor)
{
uint64_t now;
struct spdk_thread *thread;
struct spdk_lw_thread *lw_thread, *tmp;
/* For each loop through the reactor, capture the time. This time
* is used for all threads. */
now = spdk_get_ticks();
_spdk_event_queue_run_batch(reactor);
TAILQ_FOREACH_SAFE(lw_thread, &reactor->threads, link, tmp) {
thread = spdk_thread_get_from_ctx(lw_thread);
spdk_thread_poll(thread, 0, now);
if (spdk_unlikely(lw_thread->resched)) {
lw_thread->resched = false;
TAILQ_REMOVE(&reactor->threads, lw_thread, link);
_reactor_schedule_thread(thread);
continue;
}
if (spdk_unlikely(spdk_thread_is_exited(thread) &&
spdk_thread_is_idle(thread))) {
TAILQ_REMOVE(&reactor->threads, lw_thread, link);
spdk_thread_destroy(thread);
continue;
}
}
if (g_framework_context_switch_monitor_enabled) {
if ((reactor->last_rusage + g_rusage_period) < now) {
get_rusage(reactor);
reactor->last_rusage = now;
}
}
}
static int
_spdk_reactor_run(void *arg)
{
@ -326,43 +366,11 @@ _spdk_reactor_run(void *arg)
_set_thread_name(thread_name);
while (1) {
uint64_t now;
/* For each loop through the reactor, capture the time. This time
* is used for all threads. */
now = spdk_get_ticks();
_spdk_event_queue_run_batch(reactor);
TAILQ_FOREACH_SAFE(lw_thread, &reactor->threads, link, tmp) {
thread = spdk_thread_get_from_ctx(lw_thread);
spdk_thread_poll(thread, 0, now);
if (spdk_unlikely(lw_thread->resched)) {
lw_thread->resched = false;
TAILQ_REMOVE(&reactor->threads, lw_thread, link);
_reactor_schedule_thread(thread);
continue;
}
if (spdk_unlikely(spdk_thread_is_exited(thread) &&
spdk_thread_is_idle(thread))) {
TAILQ_REMOVE(&reactor->threads, lw_thread, link);
spdk_thread_destroy(thread);
continue;
}
}
reactor_run(reactor);
if (g_reactor_state != SPDK_REACTOR_STATE_RUNNING) {
break;
}
if (g_framework_context_switch_monitor_enabled) {
if ((reactor->last_rusage + g_rusage_period) < now) {
get_rusage(reactor);
reactor->last_rusage = now;
}
}
}
TAILQ_FOREACH_SAFE(lw_thread, &reactor->threads, link, tmp) {