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Threads: smoothening loop pickup and less aggressive dropping

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This commit is contained in:
Maria Matejka 2024-06-09 11:29:47 +02:00
parent 8ad9c946e1
commit 1180f25123
2 changed files with 42 additions and 27 deletions
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67
sysdep/unix/io-loop.c
View File

@ -573,7 +573,7 @@ sockets_fire(struct birdloop *loop)
*/
static void bird_thread_start_event(void *_data);
static void bird_thread_busy_update(struct bird_thread *thr, int timeout_ms);
static void bird_thread_busy_set(struct bird_thread *thr, int val);
struct birdloop_pickup_group {
DOMAIN(attrs) domain;
@ -652,6 +652,8 @@ birdloop_set_thread(struct birdloop *loop, struct bird_thread *thr, struct birdl
group->loop_unassigned_count++;
UNLOCK_DOMAIN(attrs, group->domain);
}
loop->last_transition_ns = ns_now();
}
static void
@ -666,6 +668,14 @@ bird_thread_pickup_next(struct birdloop_pickup_group *group)
wakeup_do_kick(SKIP_BACK(struct bird_thread, n, HEAD(group->threads)));
}
static _Bool
birdloop_hot_potato(struct birdloop *loop)
{
if (!loop) return 0;
if (!NODE_VALID(&loop->n)) return 0;
return ns_now() - loop->last_transition_ns < 1 S TO_NS;
}
static void
birdloop_take(struct birdloop_pickup_group *group)
{
@ -675,7 +685,8 @@ birdloop_take(struct birdloop_pickup_group *group)
if (this_thread->busy_active &&
(group->thread_busy_count < group->thread_count) &&
(this_thread->loop_count > 1))
(this_thread->loop_count > 1) &&
birdloop_hot_potato(HEAD(group->loops)))
{
THREAD_TRACE(DL_SCHEDULING, "Loop drop requested (tbc=%d, tc=%d, lc=%d)",
group->thread_busy_count, group->thread_count, this_thread->loop_count);
@ -686,7 +697,7 @@ birdloop_take(struct birdloop_pickup_group *group)
WALK_LIST2(loop, n, this_thread->loops, n)
{
birdloop_enter(loop);
if (ev_active(&loop->event) && !loop->stopped)
if (ev_active(&loop->event) && !loop->stopped && !birdloop_hot_potato(loop))
{
LOOP_TRACE(loop, DL_SCHEDULING, "Dropping from thread");
/* Pass to another thread */
@ -710,7 +721,8 @@ birdloop_take(struct birdloop_pickup_group *group)
if (dropped)
return;
bird_thread_busy_update(this_thread, -1);
this_thread->busy_counter = 0;
bird_thread_busy_set(this_thread, 0);
LOCK_DOMAIN(attrs, group->domain);
}
@ -773,25 +785,6 @@ bird_thread_busy_set(struct bird_thread *thr, int val)
UNLOCK_DOMAIN(attrs, thr->group->domain);
}
static void
bird_thread_busy_update(struct bird_thread *thr, int timeout_ms)
{
int idle_force = (timeout_ms < 0);
int val = (timeout_ms < 5) && !idle_force;
if (val == thr->busy_active)
return;
if (val && (++thr->busy_counter == 4))
return bird_thread_busy_set(thr, 1);
if (!val && (idle_force || (--thr->busy_counter == 0)))
{
thr->busy_counter = 0;
bird_thread_busy_set(thr, 0);
}
}
static void *
bird_thread_main(void *arg)
{
@ -880,11 +873,31 @@ bird_thread_main(void *arg)
ASSERT_DIE(pfd.loop.used == pfd.pfd.used);
THREAD_TRACE(DL_SOCKETS, "Total %d sockets", pfd.pfd.used);
}
/* Nothing to do in at least 5 seconds, flush local hot page cache */
else if ((timeout > 5000) || (timeout < 0))
flush_local_pages();
bird_thread_busy_update(thr, timeout);
/* Check thread busy indicator */
int idle_force = (timeout < 0) || (timeout > 300);
int busy_now = (timeout < 5) && !idle_force;
/* Nothing to do right now, flush local hot page cache */
if (idle_force)
{
LOCK_DOMAIN(attrs, thr->group->domain);
if (!EMPTY_LIST(thr->group->loops))
timeout = 0;
UNLOCK_DOMAIN(attrs, thr->group->domain);
if (timeout)
flush_local_pages();
}
if (busy_now && !thr->busy_active && (++thr->busy_counter == 4))
bird_thread_busy_set(thr, 1);
if (!busy_now && thr->busy_active && (idle_force || (--thr->busy_counter == 0)))
{
thr->busy_counter = 0;
bird_thread_busy_set(thr, 0);
}
account_to(&this_thread->idle);
birdloop_leave(thr->meta);

2
sysdep/unix/io-loop.h
View File

@ -59,6 +59,8 @@ struct birdloop
#define LTT_PING 1
#define LTT_MOVE 2
u64 last_transition_ns;
void (*stopped)(void *data);
void *stop_data;