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GET /api/1.1/patches/2221997/?format=api
{ "id": 2221997, "url": "http://patchwork.ozlabs.org/api/1.1/patches/2221997/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260410150457.85190-3-zhangckid@gmail.com/", "project": { "id": 14, "url": "http://patchwork.ozlabs.org/api/1.1/projects/14/?format=api", "name": "QEMU Development", "link_name": "qemu-devel", "list_id": "qemu-devel.nongnu.org", "list_email": "qemu-devel@nongnu.org", "web_url": "", "scm_url": "", "webscm_url": "" }, "msgid": "<20260410150457.85190-3-zhangckid@gmail.com>", "date": "2026-04-10T15:04:45", "name": "[V6,02/14] iothread: introduce iothread_ref/unref to track attached devices", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "a6c71cfbd7e219fb8b12432a8367462fe4377612", "submitter": { "id": 72278, "url": "http://patchwork.ozlabs.org/api/1.1/people/72278/?format=api", "name": "Zhang Chen", "email": "zhangckid@gmail.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260410150457.85190-3-zhangckid@gmail.com/mbox/", "series": [ { "id": 499477, "url": "http://patchwork.ozlabs.org/api/1.1/series/499477/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/list/?series=499477", "date": "2026-04-10T15:04:43", "name": "iothread: Support tracking and querying IOThread holders", "version": 6, "mbox": "http://patchwork.ozlabs.org/series/499477/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2221997/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2221997/checks/", "tags": {}, "headers": { "Return-Path": "<qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org>", "X-Original-To": "incoming@patchwork.ozlabs.org", "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=jqNpYybi;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; 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David Alan Gilbert\" <dave@treblig.org>,\n Eric Blake <eblake@redhat.com>, Markus Armbruster <armbru@redhat.com>,\n \"Michael S . Tsirkin\" <mst@redhat.com>,\n Stefan Hajnoczi <stefanha@redhat.com>", "Cc": "Zhang Chen <zhangckid@gmail.com>", "Subject": "[PATCH V6 02/14] iothread: introduce iothread_ref/unref to track\n attached devices", "Date": "Fri, 10 Apr 2026 23:04:45 +0800", "Message-ID": "<20260410150457.85190-3-zhangckid@gmail.com>", "X-Mailer": "git-send-email 2.49.0", "In-Reply-To": "<20260410150457.85190-1-zhangckid@gmail.com>", "References": "<20260410150457.85190-1-zhangckid@gmail.com>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "Received-SPF": "pass client-ip=2607:f8b0:4864:20::1031;\n envelope-from=zhangckid@gmail.com; helo=mail-pj1-x1031.google.com", "X-Spam_score_int": "-20", "X-Spam_score": "-2.1", "X-Spam_bar": "--", "X-Spam_report": "(-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1,\n DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001,\n RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001,\n SPF_PASS=-0.001 autolearn=ham autolearn_force=no", "X-Spam_action": "no action", "X-BeenThere": "qemu-devel@nongnu.org", "X-Mailman-Version": "2.1.29", "Precedence": "list", "List-Id": "qemu development <qemu-devel.nongnu.org>", "List-Unsubscribe": "<https://lists.nongnu.org/mailman/options/qemu-devel>,\n <mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>", "List-Archive": "<https://lists.nongnu.org/archive/html/qemu-devel>", "List-Post": "<mailto:qemu-devel@nongnu.org>", "List-Help": "<mailto:qemu-devel-request@nongnu.org?subject=help>", "List-Subscribe": "<https://lists.nongnu.org/mailman/listinfo/qemu-devel>,\n <mailto:qemu-devel-request@nongnu.org?subject=subscribe>", "Errors-To": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org", "Sender": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org" }, "content": "Currently, IOThreads do not maintain a record of which devices are\nassociated with them. This makes it difficult to monitor the\nworkload distribution of IOThreads, especially in complex\nhotplug scenarios involving multiple virtio-blk or virtio-scsi devices.\n\nThis patch introduces a reference counting and tracking mechanism\nwithin the IOThread object:\n\n- iothread_ref(): Prepends the device's QOM path to a list.\n- iothread_unref(): Searches for the device path using a custom\n string comparison (g_strcmp0), releases the associated memory\n upon a successful match.\n- holders: A GList storing the QOM paths of attached devices\n for runtime introspection.\n\nThis infrastructure allows management tools and QMP commands to\nquery the attachment status of IOThreads.\n\nSigned-off-by: Zhang Chen <zhangckid@gmail.com>\n---\n include/system/iothread.h | 1 +\n iothread.c | 56 +++++++++++++++++++++++++++++++++++++++\n qapi/misc.json | 48 +++++++++++++++++++++++++++++++++\n 3 files changed, 105 insertions(+)", "diff": "diff --git a/include/system/iothread.h b/include/system/iothread.h\nindex e26d13c6c7..21a76bd70d 100644\n--- a/include/system/iothread.h\n+++ b/include/system/iothread.h\n@@ -33,6 +33,7 @@ struct IOThread {\n bool stopping; /* has iothread_stop() been called? */\n bool running; /* should iothread_run() continue? */\n int thread_id;\n+ GList *holders; /* an array of QOM paths for attached devices */\n \n /* AioContext poll parameters */\n int64_t poll_max_ns;\ndiff --git a/iothread.c b/iothread.c\nindex caf68e0764..c43266b191 100644\n--- a/iothread.c\n+++ b/iothread.c\n@@ -36,6 +36,55 @@\n #define IOTHREAD_POLL_MAX_NS_DEFAULT 0ULL\n #endif\n \n+/*\n+ * Add holder device path to the list.\n+ */\n+static void iothread_ref(IOThread *iothread, const char *holder)\n+{\n+ IoThreadHolder *h = g_new0(IoThreadHolder, 1);\n+\n+ if (holder && holder[0] == '/') {\n+ h->type = IO_THREAD_HOLDER_KIND_QOM_OBJECT;\n+ h->u.qom_object.data = g_strdup(holder);\n+ } else {\n+ h->type = IO_THREAD_HOLDER_KIND_BLOCK_NODE;\n+ h->u.block_node.data = g_strdup(holder ? holder : \"unknown\");\n+ }\n+\n+ iothread->holders = g_list_prepend(iothread->holders, h);\n+}\n+\n+static int iothread_holder_compare(gconstpointer a, gconstpointer b)\n+{\n+ const IoThreadHolder *holder_node = a;\n+ const char *target_name = b;\n+ const char *current_name = NULL;\n+\n+ if (holder_node->type == IO_THREAD_HOLDER_KIND_QOM_OBJECT) {\n+ current_name = holder_node->u.qom_object.data;\n+ } else if (holder_node->type == IO_THREAD_HOLDER_KIND_BLOCK_NODE) {\n+ current_name = holder_node->u.block_node.data;\n+ }\n+\n+ return g_strcmp0(current_name, target_name);\n+}\n+\n+/*\n+ * Delete holder device path from the list.\n+ */\n+static void iothread_unref(IOThread *iothread, const char *holder)\n+{\n+ GList *link = g_list_find_custom(iothread->holders, holder,\n+ (GCompareFunc)iothread_holder_compare);\n+\n+ /* We don't support unref without a link */\n+ assert(link);\n+\n+ IoThreadHolder *h = (IoThreadHolder *)link->data;\n+ qapi_free_IoThreadHolder(h);\n+ iothread->holders = g_list_delete_link(iothread->holders, link);\n+}\n+\n static void *iothread_run(void *opaque)\n {\n IOThread *iothread = opaque;\n@@ -115,6 +164,9 @@ static void iothread_instance_finalize(Object *obj)\n \n iothread_stop(iothread);\n \n+ /* We don't support finalize without holders */\n+ assert(iothread->holders == NULL);\n+\n /*\n * Before glib2 2.33.10, there is a glib2 bug that GSource context\n * pointer may not be cleared even if the context has already been\n@@ -336,6 +388,10 @@ char *iothread_get_id(IOThread *iothread)\n \n AioContext *iothread_get_aio_context(IOThread *iothread)\n {\n+ /* Remove in next patch for build */\n+ iothread_ref(iothread, \"tmp\");\n+ iothread_unref(iothread, \"tmp\");\n+\n return iothread->ctx;\n }\n \ndiff --git a/qapi/misc.json b/qapi/misc.json\nindex 1f5062df2a..d65d8012b2 100644\n--- a/qapi/misc.json\n+++ b/qapi/misc.json\n@@ -67,6 +67,54 @@\n ##\n { 'command': 'query-name', 'returns': 'NameInfo', 'allow-preconfig': true }\n \n+\n+##\n+# @IoThreadHolderBlockNode:\n+#\n+# @data: Block node name.\n+#\n+# Since: 11.0\n+#\n+##\n+{ 'struct': 'IoThreadHolderBlockNode',\n+ 'data': { 'data': 'str' } }\n+\n+##\n+# @IoThreadHolderQomObject:\n+#\n+# @data: QOM path.\n+#\n+# Since: 11.0\n+#\n+##\n+{ 'struct': 'IoThreadHolderQomObject',\n+ 'data': { 'data': 'str' } }\n+\n+##\n+# @IoThreadHolderKind:\n+#\n+# @block-node: Block node name.\n+# @qom-object: Standard QOM path.\n+#\n+# Since: 11.0\n+##\n+{ 'enum': 'IoThreadHolderKind',\n+ 'data': [ 'block-node', 'qom-object' ] }\n+\n+##\n+# @IoThreadHolder:\n+#\n+# @type: Current IoThread holder type support QOM path and Block node.\n+#\n+# Since: 11.0\n+##\n+{ 'union': 'IoThreadHolder',\n+ 'base': { 'type': 'IoThreadHolderKind' },\n+ 'discriminator': 'type',\n+ 'data': {\n+ 'block-node': 'IoThreadHolderBlockNode',\n+ 'qom-object': 'IoThreadHolderQomObject' } }\n+\n ##\n # @IOThreadInfo:\n #\n", "prefixes": [ "V6", "02/14" ] }