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GET /api/1.1/patches/2221995/?format=api
{ "id": 2221995, "url": "http://patchwork.ozlabs.org/api/1.1/patches/2221995/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260410150457.85190-7-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": "<20260410150457.85190-7-zhangckid@gmail.com>", "date": "2026-04-10T15:04:49", "name": "[V6,06/14] monitor: Update tracking iothread users with holder name", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "44b4abfe054d76dfc6940094d654811a5551dbeb", "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/20260410150457.85190-7-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/2221995/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2221995/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=a1FslxY2;\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 06/14] monitor: Update tracking iothread users with holder\n name", "Date": "Fri, 10 Apr 2026 23:04:49 +0800", "Message-ID": "<20260410150457.85190-7-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::1036;\n envelope-from=zhangckid@gmail.com; helo=mail-pj1-x1036.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": "Since the Monitor struct is not a QOM Object, we cannot use\nobject_get_canonical_path(). Instead, this patch uses the monitor's\nname (or a default type-based name) as the holder identifier.\n\nCache the AioContext in the Monitor struct to avoid repeated calls to\niothread_get_aio_context() and ensure symmetrical ref/unref during\nmonitor lifecycle.\n\nSigned-off-by: Zhang Chen <zhangckid@gmail.com>\n---\n monitor/monitor-internal.h | 3 +++\n monitor/monitor.c | 24 ++++++++++++++++++++++--\n monitor/qmp.c | 3 ++-\n 3 files changed, 27 insertions(+), 3 deletions(-)", "diff": "diff --git a/monitor/monitor-internal.h b/monitor/monitor-internal.h\nindex feca111ae3..51cedf90e4 100644\n--- a/monitor/monitor-internal.h\n+++ b/monitor/monitor-internal.h\n@@ -116,6 +116,9 @@ struct Monitor {\n guint out_watch;\n int mux_out;\n int reset_seen;\n+\n+ /* iothread context */\n+ AioContext *ctx;\n };\n \n struct MonitorHMP {\ndiff --git a/monitor/monitor.c b/monitor/monitor.c\nindex 00b93ed612..b6efe776d6 100644\n--- a/monitor/monitor.c\n+++ b/monitor/monitor.c\n@@ -529,7 +529,7 @@ int monitor_suspend(Monitor *mon)\n * Kick I/O thread to make sure this takes effect. It'll be\n * evaluated again in prepare() of the watch object.\n */\n- aio_notify(iothread_get_aio_context(mon_iothread));\n+ aio_notify(mon->ctx);\n }\n \n trace_monitor_suspend(mon, 1);\n@@ -564,7 +564,7 @@ void monitor_resume(Monitor *mon)\n AioContext *ctx;\n \n if (mon->use_io_thread) {\n- ctx = iothread_get_aio_context(mon_iothread);\n+ ctx = mon->ctx;\n } else {\n ctx = qemu_get_aio_context();\n }\n@@ -612,6 +612,18 @@ void monitor_data_init(Monitor *mon, bool is_qmp, bool skip_flush,\n {\n if (use_io_thread && !mon_iothread) {\n monitor_iothread_init();\n+ /*\n+ * Because of current Monitor is not a QOM Object,\n+ * so using OBJECT(mon) is undefined behavior and may crash.\n+ * Try using a hard-coded future implementation of the qom path instead.\n+ * (Like the name of the \"mon_iothread\").\n+ * long-term solution would be making Monitor QOM, after that change\n+ * here to:\n+ * g_autofree path = object_get_canonical_path(OBJECT(mon));\n+ */\n+ g_autofree char *path = g_strdup(is_qmp ? \"/monitor/qmp_mon0\" :\n+ \"/monitor/hmp_mon0\");\n+ mon->ctx = iothread_ref_and_get_aio_context(mon_iothread, path);\n }\n qemu_mutex_init(&mon->mon_lock);\n mon->is_qmp = is_qmp;\n@@ -631,6 +643,14 @@ void monitor_data_destroy(Monitor *mon)\n }\n g_string_free(mon->outbuf, true);\n qemu_mutex_destroy(&mon->mon_lock);\n+\n+ if (mon->ctx && mon_iothread) {\n+ g_autofree char *path = g_strdup(monitor_is_qmp(mon) ?\n+ \"/monitor/qmp_mon0\" :\n+ \"/monitor/hmp_mon0\");\n+ iothread_put_aio_context(mon_iothread, path);\n+ mon->ctx = NULL;\n+ }\n }\n \n void monitor_cleanup(void)\ndiff --git a/monitor/qmp.c b/monitor/qmp.c\nindex 687019811f..8e4a775fac 100644\n--- a/monitor/qmp.c\n+++ b/monitor/qmp.c\n@@ -549,7 +549,8 @@ void monitor_init_qmp(Chardev *chr, bool pretty, Error **errp)\n * since chardev might be running in the monitor I/O\n * thread. Schedule a bottom half.\n */\n- aio_bh_schedule_oneshot(iothread_get_aio_context(mon_iothread),\n+ Monitor *mon_p = &mon->common;\n+ aio_bh_schedule_oneshot(mon_p->ctx,\n monitor_qmp_setup_handlers_bh, mon);\n /* The bottom half will add @mon to @mon_list */\n } else {\n", "prefixes": [ "V6", "06/14" ] }