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GET /api/patches/2215586/?format=api
{ "id": 2215586, "url": "http://patchwork.ozlabs.org/api/patches/2215586/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260324194333.30004-3-farosas@suse.de/", "project": { "id": 14, "url": "http://patchwork.ozlabs.org/api/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": "", "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260324194333.30004-3-farosas@suse.de>", "list_archive_url": null, "date": "2026-03-24T19:43:17", "name": "[RFC,v1,02/17] vmstate: Remove vmstate_use_marker_field", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "cef67c2f954ee7220a918362b5719be73babb229", "submitter": { "id": 85343, "url": "http://patchwork.ozlabs.org/api/people/85343/?format=api", "name": "Fabiano Rosas", "email": "farosas@suse.de" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260324194333.30004-3-farosas@suse.de/mbox/", "series": [ { "id": 497339, "url": "http://patchwork.ozlabs.org/api/series/497339/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/list/?series=497339", "date": "2026-03-24T19:43:16", "name": "migration: vmstate_save|load changes for peterx", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/497339/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2215586/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2215586/checks/", "tags": {}, "related": [], "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 (1024-bit key;\n unprotected) header.d=suse.de header.i=@suse.de header.a=rsa-sha256\n header.s=susede2_rsa header.b=DRINr/ce;\n\tdkim=pass header.d=suse.de header.i=@suse.de header.a=ed25519-sha256\n header.s=susede2_ed25519 header.b=9v1oANsG;\n\tdkim=pass (1024-bit key) header.d=suse.de header.i=@suse.de\n header.a=rsa-sha256 header.s=susede2_rsa header.b=DRINr/ce;\n\tdkim=neutral header.d=suse.de header.i=@suse.de header.a=ed25519-sha256\n header.s=susede2_ed25519 header.b=9v1oANsG;\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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Tue, 24 Mar 2026 19:43:38 +0000" ], "DKIM-Signature": [ "v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de;\n s=susede2_rsa;\n t=1774381419;\n h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc:\n mime-version:mime-version:\n content-transfer-encoding:content-transfer-encoding:\n in-reply-to:in-reply-to:references:references;\n bh=mOj3zMUeBqO9nHYs5Dx7oYii7b7IiXytgZof79LgWPU=;\n b=DRINr/cehm+I6s678RRyGv01dVLI6BZPjlBucnhosyw/zsx7O5Q+fMjsV0xhdNOnkzIlI2\n OkXeL9ppvpFWNeS30JmYSPcI+VcFawtIr1hmIaH+DvAkZiJecWU3HZDrDk2ivuvI4csWLa\n ifca4sJJavwjXX+BbFm10Q0KyOXIDNc=", "v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de;\n s=susede2_ed25519; t=1774381419;\n h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc:\n mime-version:mime-version:\n content-transfer-encoding:content-transfer-encoding:\n in-reply-to:in-reply-to:references:references;\n bh=mOj3zMUeBqO9nHYs5Dx7oYii7b7IiXytgZof79LgWPU=;\n b=9v1oANsGkUrZshmbXwD/jmO1O0RZgxYt3J2FAMX5H8s4UVDBUG7MBs8vnQUtyqqIXhK6VG\n FZxRZGNCPOALbrCQ==", "v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de;\n s=susede2_rsa;\n t=1774381419;\n h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc:\n mime-version:mime-version:\n content-transfer-encoding:content-transfer-encoding:\n in-reply-to:in-reply-to:references:references;\n bh=mOj3zMUeBqO9nHYs5Dx7oYii7b7IiXytgZof79LgWPU=;\n b=DRINr/cehm+I6s678RRyGv01dVLI6BZPjlBucnhosyw/zsx7O5Q+fMjsV0xhdNOnkzIlI2\n OkXeL9ppvpFWNeS30JmYSPcI+VcFawtIr1hmIaH+DvAkZiJecWU3HZDrDk2ivuvI4csWLa\n ifca4sJJavwjXX+BbFm10Q0KyOXIDNc=", "v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de;\n s=susede2_ed25519; t=1774381419;\n h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc:\n mime-version:mime-version:\n content-transfer-encoding:content-transfer-encoding:\n in-reply-to:in-reply-to:references:references;\n bh=mOj3zMUeBqO9nHYs5Dx7oYii7b7IiXytgZof79LgWPU=;\n b=9v1oANsGkUrZshmbXwD/jmO1O0RZgxYt3J2FAMX5H8s4UVDBUG7MBs8vnQUtyqqIXhK6VG\n FZxRZGNCPOALbrCQ==" ], "From": "Fabiano Rosas <farosas@suse.de>", "To": "qemu-devel@nongnu.org", "Cc": "Peter Xu <peterx@redhat.com>,\n Alexander Mikhalitsyn <alexander@mihalicyn.com>,\n Juraj Marcin <jmarcin@redhat.com>", "Subject": "[RFC PATCH v1 02/17] vmstate: Remove vmstate_use_marker_field", "Date": "Tue, 24 Mar 2026 16:43:17 -0300", "Message-ID": "<20260324194333.30004-3-farosas@suse.de>", "X-Mailer": "git-send-email 2.51.0", "In-Reply-To": "<20260324194333.30004-1-farosas@suse.de>", "References": "<20260324194333.30004-1-farosas@suse.de>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "X-Spamd-Result": "default: False [-3.01 / 50.00]; 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envelope-from=farosas@suse.de;\n helo=smtp-out2.suse.de", "X-Spam_score_int": "-43", "X-Spam_score": "-4.4", "X-Spam_bar": "----", "X-Spam_report": "(-4.4 / 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,\n RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001,\n RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, 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": "Bring back is_null, but set use_marker_field based on it. This makes\nit clear that the compression logic is only because of the null\nmarker. When the marker is not null, it doesn't make sense to\ncompress.\n\nSigned-off-by: Fabiano Rosas <farosas@suse.de>\n---\n migration/vmstate.c | 36 ++++++++++--------------------------\n 1 file changed, 10 insertions(+), 26 deletions(-)", "diff": "diff --git a/migration/vmstate.c b/migration/vmstate.c\nindex 7d7d9c7e18..7edfa3d990 100644\n--- a/migration/vmstate.c\n+++ b/migration/vmstate.c\n@@ -240,22 +240,6 @@ static bool vmstate_post_load(const VMStateDescription *vmsd,\n return true;\n }\n \n-\n-/*\n- * If we will use a ptr marker in the stream for a field? Two use cases:\n- *\n- * (1) When used with VMS_ARRAY_OF_POINTER_ALLOW_NULL, it must always be\n- * present to imply the population status of the pointer.\n- *\n- * (2) When used with normal VMSD array fields, only emit a null ptr marker\n- * if the pointer is NULL.\n- */\n-static inline bool\n-vmstate_use_marker_field(void *ptr, int size, bool dynamic_array)\n-{\n- return (!ptr && size) || dynamic_array;\n-}\n-\n bool vmstate_load_vmsd(QEMUFile *f, const VMStateDescription *vmsd,\n void *opaque, int version_id, Error **errp)\n {\n@@ -318,8 +302,8 @@ bool vmstate_load_vmsd(QEMUFile *f, const VMStateDescription *vmsd,\n curr_elem = *(void **)curr_elem_p;\n }\n \n- use_marker_field = vmstate_use_marker_field(curr_elem, size,\n- use_dynamic_array);\n+ use_marker_field = use_dynamic_array || (!curr_elem && size);\n+\n if (use_marker_field) {\n /* Read the marker instead of VMSD first */\n if (!vmstate_ptr_marker_load(f, &load_field, errp)) {\n@@ -634,7 +618,7 @@ static bool vmstate_save_vmsd_v(QEMUFile *f, const VMStateDescription *vmsd,\n int i, n_elems = vmstate_n_elems(opaque, field);\n int size = vmstate_size(opaque, field);\n JSONWriter *vmdesc_loop = vmdesc;\n- bool use_marker_field_prev = false;\n+ bool is_null_prev = false;\n /*\n * When this is enabled, it means we will always push a ptr\n * marker first for each element saying if it's populated.\n@@ -651,7 +635,7 @@ static bool vmstate_save_vmsd_v(QEMUFile *f, const VMStateDescription *vmsd,\n for (i = 0; i < n_elems; i++) {\n void *curr_elem = first_elem + size * i;\n const VMStateField *inner_field;\n- bool use_marker_field;\n+ bool use_marker_field, is_null;\n int max_elems = n_elems - i;\n \n if (field->flags & VMS_ARRAY_OF_POINTER) {\n@@ -659,8 +643,8 @@ static bool vmstate_save_vmsd_v(QEMUFile *f, const VMStateDescription *vmsd,\n curr_elem = *(void **)curr_elem;\n }\n \n- use_marker_field = vmstate_use_marker_field(curr_elem, size,\n- use_dynamic_array);\n+ is_null = (!curr_elem && size);\n+ use_marker_field = use_dynamic_array || is_null;\n \n if (use_marker_field) {\n inner_field = vmsd_create_ptr_marker_field(field);\n@@ -681,16 +665,16 @@ static bool vmstate_save_vmsd_v(QEMUFile *f, const VMStateDescription *vmsd,\n */\n if (vmdesc && vmsd_can_compress(field) &&\n (field->flags & VMS_ARRAY_OF_POINTER) &&\n- use_marker_field != use_marker_field_prev) {\n+ is_null != is_null_prev) {\n \n- use_marker_field_prev = use_marker_field;\n+ is_null_prev = is_null;\n vmdesc_loop = vmdesc;\n \n for (int j = i + 1; j < n_elems; j++) {\n void *elem = *(void **)(first_elem + size * j);\n- bool elem_use_marker_field = !elem && size;\n+ bool elem_is_null = !elem && size;\n \n- if (use_marker_field != elem_use_marker_field) {\n+ if (is_null != elem_is_null) {\n max_elems = j - i;\n break;\n }\n", "prefixes": [ "RFC", "v1", "02/17" ] }