From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.5 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C6956C433B4 for ; Mon, 3 May 2021 11:14:08 +0000 (UTC) Received: from shelob.surriel.com (shelob.surriel.com [96.67.55.147]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 5B51D61221 for ; Mon, 3 May 2021 11:14:08 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 5B51D61221 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=vt.edu Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kernelnewbies-bounces@kernelnewbies.org Received: from localhost ([::1] helo=shelob.surriel.com) by shelob.surriel.com with esmtp (Exim 4.94) (envelope-from ) id 1ldWWS-0001or-Nt; Mon, 03 May 2021 07:13:56 -0400 Received: from mail-qk1-x72c.google.com ([2607:f8b0:4864:20::72c]) by shelob.surriel.com with esmtps (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (Exim 4.94) (envelope-from ) id 1ldWWP-0001oR-G8 for kernelnewbies@kernelnewbies.org; Mon, 03 May 2021 07:13:53 -0400 Received: by mail-qk1-x72c.google.com with SMTP id o5so4595424qkb.0 for ; Mon, 03 May 2021 04:13:53 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=vt-edu.20150623.gappssmtp.com; s=20150623; h=sender:from:to:cc:subject:in-reply-to:references:mime-version :content-transfer-encoding:date:message-id; bh=UxA0V7V6eiwI6cSuZovrBXpFgB80r/eWuqWYyzS5T88=; b=QNo5dW2ZainTgJw6HT30sbliE7d5zSk3vWUWSahNDkqnzdtg4uyD3bs+XkIlJYxnG2 3N5yRjhgaoaT5ueOw7tbLjTkZZC/1mc5aVMWxj+1fW+NPcSagVqJu+BGrt3THRs+Tn3I 1UoK46eq3wa8Qg3FPZHUX/0GRJFPt74kUVzQ2FOBxm/M2XGx3W6al20GS6IIkWzxz9/n UIU9cYN8sbFkqONsn+VUwziZUXDGYSclt5gdEPKqQ16wm8LXo3R07vGKe4bKUEg69VN9 I4GbTUoEKdG3PxdjGmacNENWkM+LRsvWIXqS+wBNG8utgM5TGluFy7/vsx63V7EWsN/6 2Hlw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:from:to:cc:subject:in-reply-to:references :mime-version:content-transfer-encoding:date:message-id; bh=UxA0V7V6eiwI6cSuZovrBXpFgB80r/eWuqWYyzS5T88=; b=UvYgjhDqMdEz4ETB/0i81g/st8DeSBgXapaAypTP9lr4GK6sSuOr/mhT2GzaAomY/H A78GL+83bDo6Di9voAwVXjdzK6ti+DpqooKMKvlbJZhtQWWUzoHD/po5JGuXPk8H1ab5 ujTKMuc/enqaqEtbgXJ6Q96FcVzfkb+wJaMc0tqQItM8sTmoQjdrGolLw0fuqUufgX4b B7GB6k2/Cet1ijIEsdHZ8ODGA/GrrkAyjlMpunDT9DqHHHIa+C8DN12x9MtYj1sqo0Iz 5mqbqDlHkvTlYdVSirHM4GlT78cNwckxMEMGPFTE1TsoOjF1TJKTi2PpmZQCoSPxTVvc 3ZdQ== X-Gm-Message-State: AOAM533/KQvd11arOWOEwliHuSvOabL9+J8alHdLwwvhpYr3ijnazagc R2B9rSAA0J9I2qaf3M7kwIg6DA== X-Google-Smtp-Source: ABdhPJwb/ClCvInmjr5w3/BZmB6BnPz4OkWLKQ52r5NCiuFw9SywMj2iG7X5PdDxOg91QIFTN+Xphg== X-Received: by 2002:a37:ef0d:: with SMTP id j13mr18937913qkk.2.1620040431273; Mon, 03 May 2021 04:13:51 -0700 (PDT) Received: from turing-police ([2601:5c0:c380:d61::359]) by smtp.gmail.com with ESMTPSA id y24sm8256518qky.85.2021.05.03.04.13.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 03 May 2021 04:13:50 -0700 (PDT) From: "Valdis Kl=?utf-8?Q?=c4=93?=tnieks" X-Google-Original-From: "Valdis Kl=?utf-8?Q?=c4=93?=tnieks" X-Mailer: exmh version 2.9.0 11/07/2018 with nmh-1.7+dev To: Hyeonggon Yoo <42.hyeyoo@gmail.com> Subject: Re: high precision timers In-Reply-To: References: Mime-Version: 1.0 Date: Mon, 03 May 2021 07:13:49 -0400 Message-ID: <230533.1620040429@turing-police> Cc: Greg KH , kernelnewbies@kernelnewbies.org X-BeenThere: kernelnewbies@kernelnewbies.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Learn about the Linux kernel List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============7367620927352417388==" Errors-To: kernelnewbies-bounces@kernelnewbies.org --===============7367620927352417388== Content-Type: multipart/signed; boundary="==_Exmh_1620040429_55268P"; micalg=pgp-sha1; protocol="application/pgp-signature" Content-Transfer-Encoding: 7bit --==_Exmh_1620040429_55268P Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable On Mon, 03 May 2021 00:56:17 +0900, Hyeonggon Yoo said: > I mean, is there an API that guarantees high precision (non architectur= e > dependent way) How do you guarantee high precision if you're on hardware that doesn't provide a high precision/resolution timer? 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