From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:54697) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Uywu1-0001GT-QU for qemu-devel@nongnu.org; Tue, 16 Jul 2013 00:30:19 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Uywu0-0007Gk-EG for qemu-devel@nongnu.org; Tue, 16 Jul 2013 00:30:17 -0400 Received: from mail-pd0-x229.google.com ([2607:f8b0:400e:c02::229]:53493) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Uywu0-0007Dk-5P for qemu-devel@nongnu.org; Tue, 16 Jul 2013 00:30:16 -0400 Received: by mail-pd0-f169.google.com with SMTP id y10so241107pdj.28 for ; Mon, 15 Jul 2013 21:30:14 -0700 (PDT) From: Liu Ping Fan Date: Tue, 16 Jul 2013 12:28:58 +0800 Message-Id: <1373948938-2494-1-git-send-email-pingfank@linux.vnet.ibm.com> Subject: [Qemu-devel] [PATCH v6] QEMUBH: make AioContext's bh re-entrant List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: Kevin Wolf , Paolo Bonzini , Stefan Hajnoczi BH will be used outside big lock, so introduce lock to protect between the writers, ie, bh's adders and deleter. The lock only affects the writers and bh's callback does not take this extra lock. Note that for the same AioContext, aio_bh_poll() can not run in parallel yet. Signed-off-by: Liu Ping Fan Reviewed-by: Stefan Hajnoczi --- v6: destroy ctx->bh_lock in aio_ctx_finalize() --- async.c | 33 +++++++++++++++++++++++++++++++-- include/block/aio.h | 7 +++++++ 2 files changed, 38 insertions(+), 2 deletions(-) diff --git a/async.c b/async.c index 90fe906..5ce3633 100644 --- a/async.c +++ b/async.c @@ -47,11 +47,16 @@ QEMUBH *aio_bh_new(AioContext *ctx, QEMUBHFunc *cb, void *opaque) bh->ctx = ctx; bh->cb = cb; bh->opaque = opaque; + qemu_mutex_lock(&ctx->bh_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_mutex_unlock(&ctx->bh_lock); return bh; } +/* Multiple occurrences of aio_bh_poll cannot be called concurrently */ int aio_bh_poll(AioContext *ctx) { QEMUBH *bh, **bhp, *next; @@ -61,9 +66,15 @@ int aio_bh_poll(AioContext *ctx) ret = 0; for (bh = ctx->first_bh; bh; bh = next) { + /* Make sure that fetching bh happens before accessing its members */ + smp_read_barrier_depends(); next = bh->next; if (!bh->deleted && bh->scheduled) { bh->scheduled = 0; + /* Paired with write barrier in bh schedule to ensure reading for + * idle & callbacks coming after bh's scheduling. + */ + smp_rmb(); if (!bh->idle) ret = 1; bh->idle = 0; @@ -75,6 +86,7 @@ int aio_bh_poll(AioContext *ctx) /* remove deleted bhs */ if (!ctx->walking_bh) { + qemu_mutex_lock(&ctx->bh_lock); bhp = &ctx->first_bh; while (*bhp) { bh = *bhp; @@ -85,6 +97,7 @@ int aio_bh_poll(AioContext *ctx) bhp = &bh->next; } } + qemu_mutex_unlock(&ctx->bh_lock); } return ret; @@ -94,24 +107,38 @@ void qemu_bh_schedule_idle(QEMUBH *bh) { if (bh->scheduled) return; - bh->scheduled = 1; 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. + */ + smp_wmb(); + bh->scheduled = 1; } void qemu_bh_schedule(QEMUBH *bh) { if (bh->scheduled) return; - bh->scheduled = 1; bh->idle = 0; + /* Make sure that idle & any writes needed by the callback are done + * before the locations are read in the aio_bh_poll. + */ + smp_wmb(); + bh->scheduled = 1; aio_notify(bh->ctx); } + +/* This func is async. + */ void qemu_bh_cancel(QEMUBH *bh) { bh->scheduled = 0; } +/* This func is async.The bottom half will do the delete action at the finial + * end. + */ void qemu_bh_delete(QEMUBH *bh) { bh->scheduled = 0; @@ -176,6 +203,7 @@ aio_ctx_finalize(GSource *source) thread_pool_free(ctx->thread_pool); aio_set_event_notifier(ctx, &ctx->notifier, NULL, NULL); event_notifier_cleanup(&ctx->notifier); + qemu_mutex_destroy(&ctx->bh_lock); g_array_free(ctx->pollfds, TRUE); } @@ -211,6 +239,7 @@ AioContext *aio_context_new(void) ctx = (AioContext *) g_source_new(&aio_source_funcs, sizeof(AioContext)); ctx->pollfds = g_array_new(FALSE, FALSE, sizeof(GPollFD)); ctx->thread_pool = NULL; + qemu_mutex_init(&ctx->bh_lock); event_notifier_init(&ctx->notifier, false); aio_set_event_notifier(ctx, &ctx->notifier, (EventNotifierHandler *) diff --git a/include/block/aio.h b/include/block/aio.h index 1836793..cc77771 100644 --- a/include/block/aio.h +++ b/include/block/aio.h @@ -17,6 +17,7 @@ #include "qemu-common.h" #include "qemu/queue.h" #include "qemu/event_notifier.h" +#include "qemu/thread.h" typedef struct BlockDriverAIOCB BlockDriverAIOCB; typedef void BlockDriverCompletionFunc(void *opaque, int ret); @@ -53,6 +54,8 @@ typedef struct AioContext { */ int walking_handlers; + /* lock to protect between bh's adders and deleter */ + QemuMutex bh_lock; /* Anchor of the list of Bottom Halves belonging to the context */ struct QEMUBH *first_bh; @@ -127,6 +130,8 @@ void aio_notify(AioContext *ctx); * aio_bh_poll: Poll bottom halves for an AioContext. * * These are internal functions used by the QEMU main loop. + * And notice that multiple occurrences of aio_bh_poll cannot + * be called concurrently */ int aio_bh_poll(AioContext *ctx); @@ -163,6 +168,8 @@ void qemu_bh_cancel(QEMUBH *bh); * Deleting a bottom half frees the memory that was allocated for it by * qemu_bh_new. It also implies canceling the bottom half if it was * scheduled. + * This func is async. The bottom half will do the delete action at the finial + * end. * * @bh: The bottom half to be deleted. */ -- 1.8.1.4