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parallel marker: speed up sharing from local to published queue

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This commit is contained in:
Andy Wingo 2023-10-23 11:17:28 +02:00
parent 2cab526963
commit 9cc12916a9
1 changed files with 28 additions and 5 deletions
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33
src/parallel-tracer.h
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@ -232,13 +232,18 @@ trace_deque_steal(struct trace_deque *q) {
}
}
static int
trace_deque_can_steal(struct trace_deque *q) {
static ssize_t
trace_deque_size(struct trace_deque *q) {
size_t t = LOAD_ACQUIRE(&q->top);
atomic_thread_fence(memory_order_seq_cst);
size_t b = LOAD_ACQUIRE(&q->bottom);
ssize_t size = b - t;
return size > 0;
return size;
}
static int
trace_deque_can_steal(struct trace_deque *q) {
return trace_deque_size(q) > 0;
}
#undef LOAD_RELAXED
@ -285,6 +290,19 @@ local_trace_queue_pop(struct local_trace_queue *q) {
return q->data[q->read++ & LOCAL_TRACE_QUEUE_MASK];
}
static inline size_t
local_trace_queue_pop_many(struct local_trace_queue *q, struct gc_ref **objv,
size_t limit) {
size_t avail = local_trace_queue_size(q);
size_t read = q->read & LOCAL_TRACE_QUEUE_MASK;
size_t contig = LOCAL_TRACE_QUEUE_SIZE - read;
if (contig < avail) avail = contig;
if (limit < avail) avail = limit;
*objv = q->data + read;
q->read += avail;
return avail;
}
enum trace_worker_state {
TRACE_WORKER_STOPPED,
TRACE_WORKER_IDLE,
@ -460,8 +478,13 @@ static inline int trace_edge(struct gc_heap *heap,
static inline void
tracer_share(struct local_tracer *trace) {
DEBUG("tracer #%zu: sharing\n", trace->worker->id);
for (size_t i = 0; i < LOCAL_TRACE_QUEUE_SHARE_AMOUNT; i++)
trace_deque_push(trace->share_deque, local_trace_queue_pop(&trace->local));
size_t to_share = LOCAL_TRACE_QUEUE_SHARE_AMOUNT;
while (to_share) {
struct gc_ref *objv;
size_t count = local_trace_queue_pop_many(&trace->local, &objv, to_share);
trace_deque_push_many(trace->share_deque, objv, count);
to_share -= count;
}
}
static inline void