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authorStefan Hajnoczi <stefanha@redhat.com>2020-02-21 09:39:51 +0000
committerStefan Hajnoczi <stefanha@redhat.com>2020-02-22 08:26:47 +0000
commit8c6b0356b53977bcfdea5299db07884915425b0c (patch)
treed309eb193c9a185cd2c9a58bcc769ffb73b108c7 /util
parent8c3570e33954d26675ec6fd224ede02763dfbd1d (diff)
util/async: make bh_aio_poll() O(1)
The ctx->first_bh list contains all created BHs, including those that are not scheduled. The list is iterated by the event loop and therefore has O(n) time complexity with respected to the number of created BHs. Rewrite BHs so that only scheduled or deleted BHs are enqueued. Only BHs that actually require action will be iterated. One semantic change is required: qemu_bh_delete() enqueues the BH and therefore invokes aio_notify(). The tests/test-aio.c:test_source_bh_delete_from_cb() test case assumed that g_main_context_iteration(NULL, false) returns false after qemu_bh_delete() but it now returns true for one iteration. Fix up the test case. This patch makes aio_compute_timeout() and aio_bh_poll() drop from a CPU profile reported by perf-top(1). Previously they combined to 9% CPU utilization when AioContext polling is commented out and the guest has 2 virtio-blk,num-queues=1 and 99 virtio-blk,num-queues=32 devices. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Message-id: 20200221093951.1414693-1-stefanha@redhat.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'util')
-rw-r--r--util/async.c237
1 files changed, 138 insertions, 99 deletions
diff --git a/util/async.c b/util/async.c
index c192a24a61..b94518b948 100644
--- a/util/async.c
+++ b/util/async.c
@@ -29,6 +29,7 @@
#include "block/thread-pool.h"
#include "qemu/main-loop.h"
#include "qemu/atomic.h"
+#include "qemu/rcu_queue.h"
#include "block/raw-aio.h"
#include "qemu/coroutine_int.h"
#include "trace.h"
@@ -36,16 +37,76 @@
/***********************************************************/
/* bottom halves (can be seen as timers which expire ASAP) */
+/* QEMUBH::flags values */
+enum {
+ /* Already enqueued and waiting for aio_bh_poll() */
+ BH_PENDING = (1 << 0),
+
+ /* Invoke the callback */
+ BH_SCHEDULED = (1 << 1),
+
+ /* Delete without invoking callback */
+ BH_DELETED = (1 << 2),
+
+ /* Delete after invoking callback */
+ BH_ONESHOT = (1 << 3),
+
+ /* Schedule periodically when the event loop is idle */
+ BH_IDLE = (1 << 4),
+};
+
struct QEMUBH {
AioContext *ctx;
QEMUBHFunc *cb;
void *opaque;
- QEMUBH *next;
- bool scheduled;
- bool idle;
- bool deleted;
+ QSLIST_ENTRY(QEMUBH) next;
+ unsigned flags;
};
+/* Called concurrently from any thread */
+static void aio_bh_enqueue(QEMUBH *bh, unsigned new_flags)
+{
+ AioContext *ctx = bh->ctx;
+ unsigned old_flags;
+
+ /*
+ * The memory barrier implicit in atomic_fetch_or makes sure that:
+ * 1. idle & any writes needed by the callback are done before the
+ * locations are read in the aio_bh_poll.
+ * 2. ctx is loaded before the callback has a chance to execute and bh
+ * could be freed.
+ */
+ old_flags = atomic_fetch_or(&bh->flags, BH_PENDING | new_flags);
+ if (!(old_flags & BH_PENDING)) {
+ QSLIST_INSERT_HEAD_ATOMIC(&ctx->bh_list, bh, next);
+ }
+
+ aio_notify(ctx);
+}
+
+/* Only called from aio_bh_poll() and aio_ctx_finalize() */
+static QEMUBH *aio_bh_dequeue(BHList *head, unsigned *flags)
+{
+ QEMUBH *bh = QSLIST_FIRST_RCU(head);
+
+ if (!bh) {
+ return NULL;
+ }
+
+ QSLIST_REMOVE_HEAD(head, next);
+
+ /*
+ * The atomic_and is paired with aio_bh_enqueue(). The implicit memory
+ * barrier ensures that the callback sees all writes done by the scheduling
+ * thread. It also ensures that the scheduling thread sees the cleared
+ * flag before bh->cb has run, and thus will call aio_notify again if
+ * necessary.
+ */
+ *flags = atomic_fetch_and(&bh->flags,
+ ~(BH_PENDING | BH_SCHEDULED | BH_IDLE));
+ return bh;
+}
+
void aio_bh_schedule_oneshot(AioContext *ctx, QEMUBHFunc *cb, void *opaque)
{
QEMUBH *bh;
@@ -55,15 +116,7 @@ void aio_bh_schedule_oneshot(AioContext *ctx, QEMUBHFunc *cb, void *opaque)
.cb = cb,
.opaque = opaque,
};
- qemu_lockcnt_lock(&ctx->list_lock);
- bh->next = ctx->first_bh;
- bh->scheduled = 1;
- bh->deleted = 1;
- /* Make sure that the members are ready before putting bh into list */
- smp_wmb();
- ctx->first_bh = bh;
- qemu_lockcnt_unlock(&ctx->list_lock);
- aio_notify(ctx);
+ aio_bh_enqueue(bh, BH_SCHEDULED | BH_ONESHOT);
}
QEMUBH *aio_bh_new(AioContext *ctx, QEMUBHFunc *cb, void *opaque)
@@ -75,12 +128,6 @@ QEMUBH *aio_bh_new(AioContext *ctx, QEMUBHFunc *cb, void *opaque)
.cb = cb,
.opaque = opaque,
};
- qemu_lockcnt_lock(&ctx->list_lock);
- bh->next = ctx->first_bh;
- /* Make sure that the members are ready before putting bh into list */
- smp_wmb();
- ctx->first_bh = bh;
- qemu_lockcnt_unlock(&ctx->list_lock);
return bh;
}
@@ -89,91 +136,56 @@ void aio_bh_call(QEMUBH *bh)
bh->cb(bh->opaque);
}
-/* Multiple occurrences of aio_bh_poll cannot be called concurrently.
- * The count in ctx->list_lock is incremented before the call, and is
- * not affected by the call.
- */
+/* Multiple occurrences of aio_bh_poll cannot be called concurrently. */
int aio_bh_poll(AioContext *ctx)
{
- QEMUBH *bh, **bhp, *next;
- int ret;
- bool deleted = false;
-
- ret = 0;
- for (bh = atomic_rcu_read(&ctx->first_bh); bh; bh = next) {
- next = atomic_rcu_read(&bh->next);
- /* The atomic_xchg is paired with the one in qemu_bh_schedule. The
- * implicit memory barrier ensures that the callback sees all writes
- * done by the scheduling thread. It also ensures that the scheduling
- * thread sees the zero before bh->cb has run, and thus will call
- * aio_notify again if necessary.
- */
- if (atomic_xchg(&bh->scheduled, 0)) {
+ BHListSlice slice;
+ BHListSlice *s;
+ int ret = 0;
+
+ QSLIST_MOVE_ATOMIC(&slice.bh_list, &ctx->bh_list);
+ QSIMPLEQ_INSERT_TAIL(&ctx->bh_slice_list, &slice, next);
+
+ while ((s = QSIMPLEQ_FIRST(&ctx->bh_slice_list))) {
+ QEMUBH *bh;
+ unsigned flags;
+
+ bh = aio_bh_dequeue(&s->bh_list, &flags);
+ if (!bh) {
+ QSIMPLEQ_REMOVE_HEAD(&ctx->bh_slice_list, next);
+ continue;
+ }
+
+ if ((flags & (BH_SCHEDULED | BH_DELETED)) == BH_SCHEDULED) {
/* Idle BHs don't count as progress */
- if (!bh->idle) {
+ if (!(flags & BH_IDLE)) {
ret = 1;
}
- bh->idle = 0;
aio_bh_call(bh);
}
- if (bh->deleted) {
- deleted = true;
+ if (flags & (BH_DELETED | BH_ONESHOT)) {
+ g_free(bh);
}
}
- /* remove deleted bhs */
- if (!deleted) {
- return ret;
- }
-
- if (qemu_lockcnt_dec_if_lock(&ctx->list_lock)) {
- bhp = &ctx->first_bh;
- while (*bhp) {
- bh = *bhp;
- if (bh->deleted && !bh->scheduled) {
- *bhp = bh->next;
- g_free(bh);
- } else {
- bhp = &bh->next;
- }
- }
- qemu_lockcnt_inc_and_unlock(&ctx->list_lock);
- }
return ret;
}
void qemu_bh_schedule_idle(QEMUBH *bh)
{
- bh->idle = 1;
- /* Make sure that idle & any writes needed by the callback are done
- * before the locations are read in the aio_bh_poll.
- */
- atomic_mb_set(&bh->scheduled, 1);
+ aio_bh_enqueue(bh, BH_SCHEDULED | BH_IDLE);
}
void qemu_bh_schedule(QEMUBH *bh)
{
- AioContext *ctx;
-
- ctx = bh->ctx;
- bh->idle = 0;
- /* The memory barrier implicit in atomic_xchg makes sure that:
- * 1. idle & any writes needed by the callback are done before the
- * locations are read in the aio_bh_poll.
- * 2. ctx is loaded before scheduled is set and the callback has a chance
- * to execute.
- */
- if (atomic_xchg(&bh->scheduled, 1) == 0) {
- aio_notify(ctx);
- }
+ aio_bh_enqueue(bh, BH_SCHEDULED);
}
-
/* This func is async.
*/
void qemu_bh_cancel(QEMUBH *bh)
{
- atomic_mb_set(&bh->scheduled, 0);
+ atomic_and(&bh->flags, ~BH_SCHEDULED);
}
/* This func is async.The bottom half will do the delete action at the finial
@@ -181,21 +193,16 @@ void qemu_bh_cancel(QEMUBH *bh)
*/
void qemu_bh_delete(QEMUBH *bh)
{
- bh->scheduled = 0;
- bh->deleted = 1;
+ aio_bh_enqueue(bh, BH_DELETED);
}
-int64_t
-aio_compute_timeout(AioContext *ctx)
+static int64_t aio_compute_bh_timeout(BHList *head, int timeout)
{
- int64_t deadline;
- int timeout = -1;
QEMUBH *bh;
- for (bh = atomic_rcu_read(&ctx->first_bh); bh;
- bh = atomic_rcu_read(&bh->next)) {
- if (bh->scheduled) {
- if (bh->idle) {
+ QSLIST_FOREACH_RCU(bh, head, next) {
+ if ((bh->flags & (BH_SCHEDULED | BH_DELETED)) == BH_SCHEDULED) {
+ if (bh->flags & BH_IDLE) {
/* idle bottom halves will be polled at least
* every 10ms */
timeout = 10000000;
@@ -207,6 +214,28 @@ aio_compute_timeout(AioContext *ctx)
}
}
+ return timeout;
+}
+
+int64_t
+aio_compute_timeout(AioContext *ctx)
+{
+ BHListSlice *s;
+ int64_t deadline;
+ int timeout = -1;
+
+ timeout = aio_compute_bh_timeout(&ctx->bh_list, timeout);
+ if (timeout == 0) {
+ return 0;
+ }
+
+ QSIMPLEQ_FOREACH(s, &ctx->bh_slice_list, next) {
+ timeout = aio_compute_bh_timeout(&s->bh_list, timeout);
+ if (timeout == 0) {
+ return 0;
+ }
+ }
+
deadline = timerlistgroup_deadline_ns(&ctx->tlg);
if (deadline == 0) {
return 0;
@@ -237,15 +266,24 @@ aio_ctx_check(GSource *source)
{
AioContext *ctx = (AioContext *) source;
QEMUBH *bh;
+ BHListSlice *s;
atomic_and(&ctx->notify_me, ~1);
aio_notify_accept(ctx);
- for (bh = ctx->first_bh; bh; bh = bh->next) {
- if (bh->scheduled) {
+ QSLIST_FOREACH_RCU(bh, &ctx->bh_list, next) {
+ if ((bh->flags & (BH_SCHEDULED | BH_DELETED)) == BH_SCHEDULED) {
return true;
}
}
+
+ QSIMPLEQ_FOREACH(s, &ctx->bh_slice_list, next) {
+ QSLIST_FOREACH_RCU(bh, &s->bh_list, next) {
+ if ((bh->flags & (BH_SCHEDULED | BH_DELETED)) == BH_SCHEDULED) {
+ return true;
+ }
+ }
+ }
return aio_pending(ctx) || (timerlistgroup_deadline_ns(&ctx->tlg) == 0);
}
@@ -265,6 +303,8 @@ static void
aio_ctx_finalize(GSource *source)
{
AioContext *ctx = (AioContext *) source;
+ QEMUBH *bh;
+ unsigned flags;
thread_pool_free(ctx->thread_pool);
@@ -287,18 +327,15 @@ aio_ctx_finalize(GSource *source)
assert(QSLIST_EMPTY(&ctx->scheduled_coroutines));
qemu_bh_delete(ctx->co_schedule_bh);
- qemu_lockcnt_lock(&ctx->list_lock);
- assert(!qemu_lockcnt_count(&ctx->list_lock));
- while (ctx->first_bh) {
- QEMUBH *next = ctx->first_bh->next;
+ /* There must be no aio_bh_poll() calls going on */
+ assert(QSIMPLEQ_EMPTY(&ctx->bh_slice_list));
+ while ((bh = aio_bh_dequeue(&ctx->bh_list, &flags))) {
/* qemu_bh_delete() must have been called on BHs in this AioContext */
- assert(ctx->first_bh->deleted);
+ assert(flags & BH_DELETED);
- g_free(ctx->first_bh);
- ctx->first_bh = next;
+ g_free(bh);
}
- qemu_lockcnt_unlock(&ctx->list_lock);
aio_set_event_notifier(ctx, &ctx->notifier, false, NULL, NULL);
event_notifier_cleanup(&ctx->notifier);
@@ -445,6 +482,8 @@ AioContext *aio_context_new(Error **errp)
AioContext *ctx;
ctx = (AioContext *) g_source_new(&aio_source_funcs, sizeof(AioContext));
+ QSLIST_INIT(&ctx->bh_list);
+ QSIMPLEQ_INIT(&ctx->bh_slice_list);
aio_context_setup(ctx);
ret = event_notifier_init(&ctx->notifier, false);