From nobody Mon Oct 6 03:16:00 2025 Received: from server-vie001.gnuweeb.org (server-vie001.gnuweeb.org [89.58.62.56]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B237950276; Sun, 27 Jul 2025 00:43:45 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=89.58.62.56 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753577027; cv=none; b=HEya8uuNxBQGSMTQ924kVS+VNUaLgc0yRmT3jxhy4BrAto1A8fiSNul0nJfecIa+CGES9r1Lim0b1wchXu0VgHggYiuLjcvk9ZMp7sZx0SPTJCX55/Ny6/ZTvQb6oIn91mKGte/eftilalf9UOP4/ygj+I9Bc1KzW3xiTP1rXWQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753577027; c=relaxed/simple; bh=etqAV++elJSj94Vs+g/cqagRXHDxS/kbllsDICy83Hc=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=JhLa7NEprz3q3sRqlBLDU3S8FuYfzrmYQTP77bIP8vx3DhFV/j/o/IUYb28tH/avpkUv3VpWBfbIN5Cu+B4IeItY9M8fWkQwcFFz5lJYpLG3IypCjRIgMrXf+oLIruSlqgR2O4LBnCt78nhuo8sXB2BnlL3hHSN714CmNDy4qYE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=gnuweeb.org; spf=pass smtp.mailfrom=gnuweeb.org; dkim=pass (2048-bit key) header.d=gnuweeb.org header.i=@gnuweeb.org header.b=gIOHzopy; arc=none smtp.client-ip=89.58.62.56 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=gnuweeb.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gnuweeb.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gnuweeb.org header.i=@gnuweeb.org header.b="gIOHzopy" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gnuweeb.org; s=new2025; t=1753577018; bh=etqAV++elJSj94Vs+g/cqagRXHDxS/kbllsDICy83Hc=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version:Content-Transfer-Encoding:Message-ID:Date:From: Reply-To:Subject:To:Cc:In-Reply-To:References:Resent-Date: Resent-From:Resent-To:Resent-Cc:User-Agent:Content-Type: Content-Transfer-Encoding; b=gIOHzopyfyxtSg0AwruuN7l2A9LuGWN/83QP90p3knEtbN4/164+c6bHKVx+8gv8M ELrAtjXmitWWCU5h0jH2WnrYdXTKx8Z/NOQUzSY05S3SHd5QOBA8GykHebkh3OeEav JZmKX9l3FAA/g/TLWcIyZR0ZFgGBjpn51DEbL0u01oOkahuzYs52TfeYkBcpPjnQ+H /8LuN1qqc3QGVaEqgp41VseYIaUXoaPAB43Pyd20PXrxausftbZdl/lDMPkgGN+XKe ZM/Qp2m32UvrZoipT3dVqhfFJndNXAgcV9xG9vIzStEyJTx2J7N5wzuBA1uh2v/uPn eTdf9HijC4xsA== Received: from integral2.. (unknown [182.253.126.144]) by server-vie001.gnuweeb.org (Postfix) with ESMTPSA id 74F3E3126E06; Sun, 27 Jul 2025 00:43:36 +0000 (UTC) From: Ammar Faizi To: Jens Axboe Cc: Ammar Faizi , Alviro Iskandar Setiawan , GNU/Weeb Mailing List , Christian Mazakas , io-uring Mailing List , Linux Kernel Mailing List Subject: [PATCH liburing 2/3] man: Add `IORING_ENTER_NO_IOWAIT` flag X-Gw-Bpl: wU/cy49Bu1yAPm0bW2qiliFUIEVf+EkEatAboK6pk2H2LSy2bfWlPAiP3YIeQ5aElNkQEhTV9Q== Date: Sun, 27 Jul 2025 07:43:15 +0700 Message-Id: <20250727004316.3351033-3-ammarfaizi2@gnuweeb.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20250727004316.3351033-1-ammarfaizi2@gnuweeb.org> References: <20250727004316.3351033-1-ammarfaizi2@gnuweeb.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Based on an explanation from the Linux kernel upstream commit: 07754bfd9aee ("io_uring: enable toggle of iowait usage when waiting on CQ= Es") Signed-off-by: Ammar Faizi --- man/io_uring_enter.2 | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) diff --git a/man/io_uring_enter.2 b/man/io_uring_enter.2 index 99c0ab222675..a054a7cdfbd4 100644 --- a/man/io_uring_enter.2 +++ b/man/io_uring_enter.2 @@ -134,7 +134,21 @@ but merely an offset into an area of wait regions prev= iously registered with .BR io_uring_register (2) using the .B IORING_REGISTER_MEM_REGION -operation. Available since 6.13 +operation. + +Available since 6.13 + +.TP +.B IORING_ENTER_NO_IOWAIT +When this flag is set, the system call will not mark the waiting task as b= eing +in iowait if it is sleeping waiting on events and there are pending reques= ts. +This is useful if iowait isn't expected when waiting for events. It can al= so +prevent extra power usage by allowing the CPU to enter lower sleep states. +This flag is only available if the kernel supports the +.B IORING_FEAT_NO_IOWAIT +feature. + +Available since 6.15. =20 .PP .PP --=20 Ammar Faizi