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=-5.8 required=3.0 tests=BAYES_00,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 55259C433B4 for ; Thu, 20 May 2021 21:17:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 34DB361355 for ; Thu, 20 May 2021 21:17:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230104AbhETVSy (ORCPT ); Thu, 20 May 2021 17:18:54 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35728 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230093AbhETVSu (ORCPT ); Thu, 20 May 2021 17:18:50 -0400 Received: from ms.lwn.net (ms.lwn.net [IPv6:2600:3c01:e000:3a1::42]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2BC40C061574; Thu, 20 May 2021 14:17:26 -0700 (PDT) Received: from localhost (unknown [IPv6:2601:281:8300:104d::5f6]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ms.lwn.net (Postfix) with ESMTPSA id BFEE12F3; Thu, 20 May 2021 21:17:25 +0000 (UTC) DKIM-Filter: OpenDKIM Filter v2.11.0 ms.lwn.net BFEE12F3 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=lwn.net; s=20201203; t=1621545445; bh=wEoEWkmh9unv7tC8nNiVNMD01nU61GT8xINDNNIpZYk=; h=From:To:Cc:Subject:In-Reply-To:References:Date:From; b=JXQWzTxbuHYe5RZPql1VxGK/csjp8yDkdjB2OFfJzruYe4Z46INES0AIUR3//LR5S GjG0UNKUivAt8YEcZTLsXm4TeF/i12cnRA3XRbyIY2SXkHgZHIPCIySwfWcShJIzy6 P9I379J0v2yl3naobXjYP8vgtDzEzhc3z6gXlPq5w4GCnjrHEyAKaLGiW1Dsk738C3 4K92b0e+l1E5Mr/VslpAo5bBfLgB6/i6GA6oj/0gaNSEfLrNuIcQfwook9tcGaPE68 46kdraHRD+s7FBPxKV4zejFBIERtUqtZXWvlvUQ1hiJvpLoigEF4CExGSucGMl91RG sl4dfyeFjjN4A== From: Jonathan Corbet To: Peter Oskolkov , Peter Zijlstra , Ingo Molnar , Thomas Gleixner , linux-kernel@vger.kernel.org, linux-api@vger.kernel.org Cc: Paul Turner , Ben Segall , Peter Oskolkov , Peter Oskolkov , Joel Fernandes , Andrew Morton , Andrei Vagin , Jim Newsome Subject: Re: [RFC PATCH v0.1 0/9] UMCG early preview/RFC patchset In-Reply-To: <20210520183614.1227046-1-posk@google.com> References: <20210520183614.1227046-1-posk@google.com> Date: Thu, 20 May 2021 15:17:25 -0600 Message-ID: <87mtspm7fe.fsf@meer.lwn.net> MIME-Version: 1.0 Content-Type: text/plain Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Peter Oskolkov writes: > As indicated earlier in the FUTEX_SWAP patchset: > > https://lore.kernel.org/lkml/20200722234538.166697-1-posk@posk.io/ > > "Google Fibers" is a userspace scheduling framework > used widely and successfully at Google to improve in-process workload > isolation and response latencies. We are working on open-sourcing > this framework, and UMCG (User-Managed Concurrency Groups) kernel > patches are intended as the foundation of this. So I have to ask...is there *any* documentation out there on what this is and how people are supposed to use it? Shockingly, typing "Google fibers" into Google leads to a less than fully joyful outcome... This won't be easy for anybody to review if they have to start by reverse-engineering what it's supposed to do. Thanks, jon