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=-6.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 AEADEC47080 for ; Sun, 23 May 2021 11:48:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7D39C600EF for ; Sun, 23 May 2021 11:48:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231733AbhEWLuJ (ORCPT ); Sun, 23 May 2021 07:50:09 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:30219 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231728AbhEWLuI (ORCPT ); Sun, 23 May 2021 07:50:08 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1621770522; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=FaFe9uffRdwTnS7acJYPwsy2NoFG/av6QEuiajyWo2M=; b=f65iVNkECTDymMichUQC+L3Bs7FCNeyuQFqbYvUn45m/ADUTM9z8gGMHsPjM5K4mEF7bI7 3Cga1Y6UMsV5xcKAuyXNJcZX6uIY4lSTdvGOoaNoKB9JQ5DXl1Xfy1R4AT1VRsZg2UPYMv GO139CKcwSSmGX7m7Y41l83YBrzugts= Received: from mail-ed1-f70.google.com (mail-ed1-f70.google.com [209.85.208.70]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-572-CrFMa2wwMXuAfE9CbFIpHw-1; Sun, 23 May 2021 07:48:38 -0400 X-MC-Unique: CrFMa2wwMXuAfE9CbFIpHw-1 Received: by mail-ed1-f70.google.com with SMTP id d8-20020a0564020008b0290387d38e3ce0so14004671edu.1 for ; Sun, 23 May 2021 04:48:37 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:in-reply-to:references:date :message-id:mime-version; bh=FaFe9uffRdwTnS7acJYPwsy2NoFG/av6QEuiajyWo2M=; b=kXIMU54hn00Bhdv1m7VruHzDrh6awSHfjTdyg8c7KWTYHR2H/lqnEmiRBjPyguFKYI TZFUpX5w/xBGRrDK+UUCZqY4Bqh3sdm966XYWEA981zEcWPIbzuOrQy0apU4jjMJ0a2c eAW+3+rAdpG6CSQLvsKRlNx0pD1uF9PGgMbStW+648iTYZ0VLG4XNOhwwQcpl6cmCn+9 +9WTZUChSvBi6IqqjmvsgxA/BB6NIOKu1uvoG9dpsSdRLkhtAh3X81lBr1NYEPQ6KUoR /mswZTfCfctGI1z9MAqrEq/5PYebCMuWkFCFAny9ceJufkBqlKaNJbmxdoDdO/e/xtZJ 4RPQ== X-Gm-Message-State: AOAM5328jpSNVxJJN0eaqnoDsu0E1UN2ymufihjGHnDAT83P8nHAN/v0 wniAJNFyakepn9i1MBDF5BxDIZX2StgRqRHVppr307PllihEvf5gGjz7nh0tUNq23ObFiKVXvnc t4D5AV/ATxm6O X-Received: by 2002:a17:906:f84:: with SMTP id q4mr18838560ejj.442.1621770516846; Sun, 23 May 2021 04:48:36 -0700 (PDT) X-Google-Smtp-Source: ABdhPJx1/dLWixp+pH0CUbLqCyt87/WqriedDInYAMUQ+9CeFHoh5eVGl0EyhfWEXWUo9Z/n2E0skA== X-Received: by 2002:a17:906:f84:: with SMTP id q4mr18838541ejj.442.1621770516434; Sun, 23 May 2021 04:48:36 -0700 (PDT) Received: from alrua-x1.borgediget.toke.dk ([2a0c:4d80:42:443::2]) by smtp.gmail.com with ESMTPSA id p8sm2792130eds.95.2021.05.23.04.48.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 23 May 2021 04:48:35 -0700 (PDT) Received: by alrua-x1.borgediget.toke.dk (Postfix, from userid 1000) id 76EB51801D6; Sun, 23 May 2021 13:48:34 +0200 (CEST) From: Toke =?utf-8?Q?H=C3=B8iland-J=C3=B8rgensen?= To: Alexei Starovoitov , davem@davemloft.net Cc: daniel@iogearbox.net, andrii@kernel.org, john.fastabend@gmail.com, lmb@cloudflare.com, netdev@vger.kernel.org, bpf@vger.kernel.org, kernel-team@fb.com Subject: Re: [RFC PATCH bpf-next] bpf: Introduce bpf_timer In-Reply-To: <20210520185550.13688-1-alexei.starovoitov@gmail.com> References: <20210520185550.13688-1-alexei.starovoitov@gmail.com> X-Clacks-Overhead: GNU Terry Pratchett Date: Sun, 23 May 2021 13:48:34 +0200 Message-ID: <87o8d1zn59.fsf@toke.dk> MIME-Version: 1.0 Content-Type: text/plain Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org Still wrapping my head around this, but one thing immediately sprang to mind: > + * long bpf_timer_mod(struct bpf_timer *timer, u64 msecs) > + * Description > + * Set the timer expiration N msecs from the current time. > + * Return > + * zero Could we make this use nanoseconds (and wire it up to hrtimers) instead? I would like to eventually be able to use this for pacing out network packets, and msec precision is way too coarse for that... -Toke