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GET /api/1.1/patches/2222571/?format=api
{ "id": 2222571, "url": "http://patchwork.ozlabs.org/api/1.1/patches/2222571/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260412215011.326196-2-jhkim@linux.ibm.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": "<20260412215011.326196-2-jhkim@linux.ibm.com>", "date": "2026-04-12T21:50:09", "name": "[v4,1/3] aio-poll: avoid unnecessary polling time computation", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "e1a43bd44d6e67dce16bf780ce33eb2333a9330d", "submitter": { "id": 91012, "url": "http://patchwork.ozlabs.org/api/1.1/people/91012/?format=api", "name": "Jaehoon Kim", "email": "jhkim@linux.ibm.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260412215011.326196-2-jhkim@linux.ibm.com/mbox/", "series": [ { "id": 499633, "url": "http://patchwork.ozlabs.org/api/1.1/series/499633/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/list/?series=499633", "date": "2026-04-12T21:50:10", "name": "improve aio-polling efficiency", "version": 4, "mbox": "http://patchwork.ozlabs.org/series/499633/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2222571/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2222571/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=ibm.com header.i=@ibm.com header.a=rsa-sha256\n header.s=pp1 header.b=X5oDLS9s;\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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a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=cc\n :content-transfer-encoding:date:from:in-reply-to:message-id\n :mime-version:references:subject:to; s=pp1; bh=GOJ5PtGfRw9JuVE9Z\n GBFN43Vs8zqFtSfYXt6iC8HpHU=; b=X5oDLS9srTBoDWTv2dNd9rvqKVqWBlMOz\n Fkrbo/C8THxGqYtAo9MQU7o5fHkIrvgIkr81xDyXAWO2PZEs2qnDUneJBYZ2Vt4t\n ik3vrrdn8rZSruOgdpda7R0vn2tT7PvjwxJHz7m05ss7euu6TI16GW7kQinnkDVb\n Pkr65Y4y2yMybxrmPaW5kuRKh8wBLqZJVbiZrN34l32SEpNTq/V9bgqEKlrnmqDH\n o5JklFkyOURAiDkAx1ulyfTBbxMYiu4pkLxznz/saxPYdmGKgtVJhbx1EbZqlcQa\n aXWlUwnato9Ao2+YTVZJZ7FB63+BglPbs6rwZgqjECNBwsYNqTFgQ==", "From": "Jaehoon Kim <jhkim@linux.ibm.com>", "To": "qemu-devel@nongnu.org, qemu-block@nongnu.org", "Cc": "pbonzini@redhat.com, stefanha@redhat.com, fam@euphon.net,\n armbru@redhat.com, eblake@redhat.com, berrange@redhat.com,\n eduardo@habkost.net, dave@treblig.org, sw@weilnetz.de,\n mjrosato@linux.ibm.com, farman@linux.ibm.com,\n Jaehoon Kim <jhkim@linux.ibm.com>", "Subject": "[PATCH v4 1/3] aio-poll: avoid unnecessary polling time computation", "Date": "Sun, 12 Apr 2026 16:50:09 -0500", "Message-ID": "<20260412215011.326196-2-jhkim@linux.ibm.com>", "X-Mailer": "git-send-email 2.43.0", "In-Reply-To": "<20260412215011.326196-1-jhkim@linux.ibm.com>", "References": "<20260412215011.326196-1-jhkim@linux.ibm.com>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "X-TM-AS-GCONF": "00", "X-Authority-Analysis": "v=2.4 cv=ErTiaycA c=1 sm=1 tr=0 ts=69dc139b cx=c_pps\n a=AfN7/Ok6k8XGzOShvHwTGQ==:117 a=AfN7/Ok6k8XGzOShvHwTGQ==:17\n a=A5OVakUREuEA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22\n a=uAbxVGIbfxUO_5tXvNgY:22 a=VnNF1IyMAAAA:8 a=20KFwNOVAAAA:8\n a=6MqEkq6nHlEWUoCmaegA:9", "X-Proofpoint-ORIG-GUID": "ckaDrHO43XM1IhWOjedwLfu8PZCcxZVu", "X-Proofpoint-GUID": "ckaDrHO43XM1IhWOjedwLfu8PZCcxZVu", "X-Proofpoint-Spam-Details-Enc": "AW1haW4tMjYwNDEyMDIxNCBTYWx0ZWRfXxvJCevnPS8mC\n +jo02k9qahrwOsQkXs7bTJSnjuGjAXUxjEA6yDuAIMAu3/rtYVmQtxixrOdh/thytbOWVC6aS9A\n BJJiaERfpvUDAG41wyzr3/4F51TDTLQCY0K6Pfud/m9jSDJwUfqne3lp6MqbjLiFFcH+349q9zd\n vVwMvOACXUrp/3QwDhkXnhCJsrHwWG2hNVjMTqr56T639SVCjrK4PpGGpYRHSQ9ep32NK9/HFlD\n yQER977EyV9fsv6zpF7w9NE+Wx+ZdTVqTm4Ze3W7xlcbWq9/tFZv2Tum7wew7DdR2juwP5YLVeM\n BtiTyd6wQc+LlV1t/cMoPtCIFiGmz4jtr6CHgF7B0ABh+4B7+Co3i/kGuuiMR6h3FUGD9i15/rY\n LacwoGkM+1RBGqXfzmAULSCsVxiOuvBY+616+OID3JMxDn95RyQvPfG5tlbGyswVM7+QaZFgk9d\n /zWXg3uyxXeyPD1TsTA==", "X-Proofpoint-Virus-Version": "vendor=baseguard\n engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49\n definitions=2026-04-12_05,2026-04-09_02,2025-10-01_01", "X-Proofpoint-Spam-Details": "rule=outbound_notspam policy=outbound score=0\n malwarescore=0 adultscore=0 suspectscore=0 bulkscore=0 clxscore=1015\n priorityscore=1501 lowpriorityscore=0 phishscore=0 spamscore=0\n impostorscore=0 classifier=typeunknown authscore=0 authtc= authcc=\n route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604010000\n definitions=main-2604120214", "Received-SPF": "pass client-ip=148.163.156.1; envelope-from=jhkim@linux.ibm.com;\n helo=mx0a-001b2d01.pphosted.com", "X-Spam_score_int": "-26", "X-Spam_score": "-2.7", "X-Spam_bar": "--", "X-Spam_report": "(-2.7 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1,\n DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7,\n RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001,\n RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001,\n SPF_HELO_NONE=0.001, 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": "Nodes are no longer added to poll_aio_handlers when adaptive polling is\ndisabled, preventing unnecessary try_poll_mode() calls. This avoids\niterating over all nodes to compute max_ns unnecessarily when polling\nis disabled.\n\nSigned-off-by: Jaehoon Kim <jhkim@linux.ibm.com>\nReviewed-by: Stefan Hajnoczi <stefanha@redhat.com>\n---\n util/aio-posix.c | 11 ++++++-----\n 1 file changed, 6 insertions(+), 5 deletions(-)", "diff": "diff --git a/util/aio-posix.c b/util/aio-posix.c\nindex 488d964611..351847c6fb 100644\n--- a/util/aio-posix.c\n+++ b/util/aio-posix.c\n@@ -307,9 +307,8 @@ static bool aio_dispatch_handler(AioContext *ctx, AioHandler *node)\n * fdmon_supports_polling(), but only until the fd fires for the first\n * time.\n */\n- if (!QLIST_IS_INSERTED(node, node_deleted) &&\n- !QLIST_IS_INSERTED(node, node_poll) &&\n- node->io_poll) {\n+ if (ctx->poll_max_ns && !QLIST_IS_INSERTED(node, node_deleted) &&\n+ !QLIST_IS_INSERTED(node, node_poll) && node->io_poll) {\n trace_poll_add(ctx, node, node->pfd.fd, revents);\n if (ctx->poll_started && node->io_poll_begin) {\n node->io_poll_begin(node->opaque);\n@@ -631,7 +630,7 @@ static void adjust_polling_time(AioContext *ctx, AioPolledEvent *poll,\n bool aio_poll(AioContext *ctx, bool blocking)\n {\n AioHandlerList ready_list = QLIST_HEAD_INITIALIZER(ready_list);\n- bool progress;\n+ bool progress = false;\n bool use_notify_me;\n int64_t timeout;\n int64_t start = 0;\n@@ -656,7 +655,9 @@ bool aio_poll(AioContext *ctx, bool blocking)\n }\n \n timeout = blocking ? aio_compute_timeout(ctx) : 0;\n- progress = try_poll_mode(ctx, &ready_list, &timeout);\n+ if (ctx->poll_max_ns != 0) {\n+ progress = try_poll_mode(ctx, &ready_list, &timeout);\n+ }\n assert(!(timeout && progress));\n \n /*\n", "prefixes": [ "v4", "1/3" ] }