From 28f082469650a0f4c0e37b4ccd6f9514b1a0698d Mon Sep 17 00:00:00 2001 From: Stefan Hajnoczi Date: Thu, 7 Mar 2013 13:41:50 +0100 Subject: [PATCH] coroutine: use AioContext for CoQueue BH CoQueue uses a BH to awake coroutines that were made ready to run again using qemu_co_queue_next() or qemu_co_queue_restart_all(). The BH currently runs in the iothread AioContext and would break coroutines that run in a different AioContext. This is a slightly tricky problem because the lifetime of the BH exceeds that of the CoQueue. This means coroutines can be awoken after CoQueue itself has been freed. Also, there is no qemu_co_queue_destroy() function which we could use to handle freeing resources. Introducing qemu_co_queue_destroy() has a ripple effect of requiring us to also add qemu_co_mutex_destroy() and qemu_co_rwlock_destroy(), as well as updating all callers. Avoid doing that. We also cannot switch from BH to GIdle function because aio_poll() does not dispatch GIdle functions. (GIdle functions make memory management slightly easier because they free themselves.) Finally, I don't want to move unlock_queue and unlock_bh into AioContext. That would break encapsulation - AioContext isn't supposed to know about CoQueue. This patch implements a different solution: each qemu_co_queue_next() or qemu_co_queue_restart_all() call creates a new BH and list of coroutines to wake up. Callers tend to invoke qemu_co_queue_next() and qemu_co_queue_restart_all() occasionally after blocking I/O, so creating a new BH for each call shouldn't be massively inefficient. Note that this patch does not add an interface for specifying the AioContext. That is left to future patches which will convert CoQueue, CoMutex, and CoRwlock to expose AioContext. Signed-off-by: Stefan Hajnoczi Reviewed-by: Paolo Bonzini --- include/block/coroutine.h | 1 + qemu-coroutine-lock.c | 59 ++++++++++++++++++++++++++------------- 2 files changed, 41 insertions(+), 19 deletions(-) diff --git a/include/block/coroutine.h b/include/block/coroutine.h index c31fae3f3c..a978162a3f 100644 --- a/include/block/coroutine.h +++ b/include/block/coroutine.h @@ -104,6 +104,7 @@ bool qemu_in_coroutine(void); */ typedef struct CoQueue { QTAILQ_HEAD(, Coroutine) entries; + AioContext *ctx; } CoQueue; /** diff --git a/qemu-coroutine-lock.c b/qemu-coroutine-lock.c index 97ef01c796..86efe1f86a 100644 --- a/qemu-coroutine-lock.c +++ b/qemu-coroutine-lock.c @@ -29,28 +29,36 @@ #include "block/aio.h" #include "trace.h" -static QTAILQ_HEAD(, Coroutine) unlock_bh_queue = - QTAILQ_HEAD_INITIALIZER(unlock_bh_queue); -static QEMUBH* unlock_bh; +/* Coroutines are awoken from a BH to allow the current coroutine to complete + * its flow of execution. The BH may run after the CoQueue has been destroyed, + * so keep BH data in a separate heap-allocated struct. + */ +typedef struct { + QEMUBH *bh; + QTAILQ_HEAD(, Coroutine) entries; +} CoQueueNextData; static void qemu_co_queue_next_bh(void *opaque) { + CoQueueNextData *data = opaque; Coroutine *next; trace_qemu_co_queue_next_bh(); - while ((next = QTAILQ_FIRST(&unlock_bh_queue))) { - QTAILQ_REMOVE(&unlock_bh_queue, next, co_queue_next); + while ((next = QTAILQ_FIRST(&data->entries))) { + QTAILQ_REMOVE(&data->entries, next, co_queue_next); qemu_coroutine_enter(next, NULL); } + + qemu_bh_delete(data->bh); + g_slice_free(CoQueueNextData, data); } void qemu_co_queue_init(CoQueue *queue) { QTAILQ_INIT(&queue->entries); - if (!unlock_bh) { - unlock_bh = qemu_bh_new(qemu_co_queue_next_bh, NULL); - } + /* This will be exposed to callers once there are multiple AioContexts */ + queue->ctx = qemu_get_aio_context(); } void coroutine_fn qemu_co_queue_wait(CoQueue *queue) @@ -69,26 +77,39 @@ void coroutine_fn qemu_co_queue_wait_insert_head(CoQueue *queue) assert(qemu_in_coroutine()); } -bool qemu_co_queue_next(CoQueue *queue) +static bool qemu_co_queue_do_restart(CoQueue *queue, bool single) { Coroutine *next; + CoQueueNextData *data; - next = QTAILQ_FIRST(&queue->entries); - if (next) { - QTAILQ_REMOVE(&queue->entries, next, co_queue_next); - QTAILQ_INSERT_TAIL(&unlock_bh_queue, next, co_queue_next); - trace_qemu_co_queue_next(next); - qemu_bh_schedule(unlock_bh); + if (QTAILQ_EMPTY(&queue->entries)) { + return false; } - return (next != NULL); + data = g_slice_new(CoQueueNextData); + data->bh = aio_bh_new(queue->ctx, qemu_co_queue_next_bh, data); + QTAILQ_INIT(&data->entries); + qemu_bh_schedule(data->bh); + + while ((next = QTAILQ_FIRST(&queue->entries)) != NULL) { + QTAILQ_REMOVE(&queue->entries, next, co_queue_next); + QTAILQ_INSERT_TAIL(&data->entries, next, co_queue_next); + trace_qemu_co_queue_next(next); + if (single) { + break; + } + } + return true; +} + +bool qemu_co_queue_next(CoQueue *queue) +{ + return qemu_co_queue_do_restart(queue, true); } void qemu_co_queue_restart_all(CoQueue *queue) { - while (qemu_co_queue_next(queue)) { - /* Do nothing */ - } + qemu_co_queue_do_restart(queue, false); } bool qemu_co_queue_empty(CoQueue *queue)