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GET /api/1.1/patches/2227507/?format=api
{ "id": 2227507, "url": "http://patchwork.ozlabs.org/api/1.1/patches/2227507/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260423195918.661299-2-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": "<20260423195918.661299-2-jhkim@linux.ibm.com>", "date": "2026-04-23T19:59:16", "name": "[v5,1/3] 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/20260423195918.661299-2-jhkim@linux.ibm.com/mbox/", "series": [ { "id": 501240, "url": "http://patchwork.ozlabs.org/api/1.1/series/501240/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/list/?series=501240", "date": "2026-04-23T19:59:15", "name": "improve aio-polling efficiency", "version": 5, "mbox": "http://patchwork.ozlabs.org/series/501240/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2227507/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2227507/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=B1KzdpI+;\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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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, 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": "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": [ "v5", "1/3" ] }