From patchwork Tue May 19 08:00:54 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Hajnoczi X-Patchwork-Id: 282403 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, MIME_BASE64_TEXT,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 21044C433DF for ; Tue, 19 May 2020 08:10:51 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id DC3B420829 for ; Tue, 19 May 2020 08:10:50 +0000 (UTC) Authentication-Results: mail.kernel.org; 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Tue, 19 May 2020 08:02:07 +0000 (UTC) Received: from localhost (ovpn-114-215.ams2.redhat.com [10.36.114.215]) by smtp.corp.redhat.com (Postfix) with ESMTP id AE07B5D9DD; Tue, 19 May 2020 08:01:58 +0000 (UTC) From: Stefan Hajnoczi To: qemu-devel@nongnu.org Subject: [PULL 8/8] aio-posix: disable fdmon-io_uring when GSource is used Date: Tue, 19 May 2020 09:00:54 +0100 Message-Id: <20200519080054.146495-9-stefanha@redhat.com> In-Reply-To: <20200519080054.146495-1-stefanha@redhat.com> References: <20200519080054.146495-1-stefanha@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=207.211.31.120; envelope-from=stefanha@redhat.com; helo=us-smtp-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/05/19 00:34:39 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -3 X-Spam_score: -0.4 X-Spam_bar: / X-Spam_report: (-0.4 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, MIME_BASE64_TEXT=1.741, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001 autolearn=_AUTOLEARN X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Laurent Vivier , Peter Maydell , Thomas Huth , qemu-block@nongnu.org, Oleksandr Natalenko , Stefan Weil , Max Reitz , Alexander Bulekov , Bandan Das , Stefan Hajnoczi , Paolo Bonzini , Fam Zheng , Kevin Wolf Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" The glib event loop does not call fdmon_io_uring_wait() so fd handlers waiting to be submitted build up in the list. There is no benefit is using io_uring when the glib GSource is being used, so disable it instead of implementing a more complex fix. This fixes a memory leak where AioHandlers would build up and increasing amounts of CPU time were spent iterating them in aio_pending(). The symptom is that guests become slow when QEMU is built with io_uring support. Buglink: https://bugs.launchpad.net/qemu/+bug/1877716 Fixes: 73fd282e7b6dd4e4ea1c3bbb3d302c8db51e4ccf ("aio-posix: add io_uring fd monitoring implementation") Signed-off-by: Stefan Hajnoczi Tested-by: Oleksandr Natalenko Message-id: 20200511183630.279750-3-stefanha@redhat.com Signed-off-by: Stefan Hajnoczi --- include/block/aio.h | 3 +++ util/aio-posix.c | 12 ++++++++++++ util/aio-win32.c | 4 ++++ util/async.c | 1 + 4 files changed, 20 insertions(+) diff --git a/include/block/aio.h b/include/block/aio.h index 62ed954344..b2f703fa3f 100644 --- a/include/block/aio.h +++ b/include/block/aio.h @@ -701,6 +701,9 @@ void aio_context_setup(AioContext *ctx); */ void aio_context_destroy(AioContext *ctx); +/* Used internally, do not call outside AioContext code */ +void aio_context_use_g_source(AioContext *ctx); + /** * aio_context_set_poll_params: * @ctx: the aio context diff --git a/util/aio-posix.c b/util/aio-posix.c index 8af334ab19..1b2a3af65b 100644 --- a/util/aio-posix.c +++ b/util/aio-posix.c @@ -682,6 +682,18 @@ void aio_context_destroy(AioContext *ctx) aio_free_deleted_handlers(ctx); } +void aio_context_use_g_source(AioContext *ctx) +{ + /* + * Disable io_uring when the glib main loop is used because it doesn't + * support mixed glib/aio_poll() usage. It relies on aio_poll() being + * called regularly so that changes to the monitored file descriptors are + * submitted, otherwise a list of pending fd handlers builds up. + */ + fdmon_io_uring_destroy(ctx); + aio_free_deleted_handlers(ctx); +} + void aio_context_set_poll_params(AioContext *ctx, int64_t max_ns, int64_t grow, int64_t shrink, Error **errp) { diff --git a/util/aio-win32.c b/util/aio-win32.c index 729d533faf..953c56ab48 100644 --- a/util/aio-win32.c +++ b/util/aio-win32.c @@ -414,6 +414,10 @@ void aio_context_destroy(AioContext *ctx) { } +void aio_context_use_g_source(AioContext *ctx) +{ +} + void aio_context_set_poll_params(AioContext *ctx, int64_t max_ns, int64_t grow, int64_t shrink, Error **errp) { diff --git a/util/async.c b/util/async.c index 3165a28f2f..1319eee3bc 100644 --- a/util/async.c +++ b/util/async.c @@ -362,6 +362,7 @@ static GSourceFuncs aio_source_funcs = { GSource *aio_get_g_source(AioContext *ctx) { + aio_context_use_g_source(ctx); g_source_ref(&ctx->source); return &ctx->source; }