From patchwork Wed Mar 29 15:33:23 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Domenico Cerasuolo X-Patchwork-Id: 7409 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a59:b0ea:0:b0:3b6:4342:cba0 with SMTP id b10csp502290vqo; Wed, 29 Mar 2023 08:35:29 -0700 (PDT) X-Google-Smtp-Source: AKy350bYpM0H2oXuknMG36eSEzH+N4nuA9cWap+qmXEXk4DAMyeN3UATTCR1aIg/kXtUfv+bH6Ai X-Received: by 2002:a05:6402:159:b0:501:caaf:1e5 with SMTP id s25-20020a056402015900b00501caaf01e5mr17476939edu.18.1680104129148; Wed, 29 Mar 2023 08:35:29 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1680104129; cv=none; d=google.com; s=arc-20160816; b=wMsHhTJYV6Ev0ZTcG5G+Da9jBzOIxltSZPiQZo7EcVERpxnmrCiR1DRuobaBmWw0TQ SjiB1w/HPadIJRg5TN4+4F5H/EJHav4SeUoKhayz6R7MvR2jDAG5N6Sqig+PPi+vmLPl i1ZwAarIIWQ/yopLEXbKjqwAa81loF2Ji6qE1WMo8ENW2474S2DOeBdxCKmyxLoWvRpu p2sFebfGKTb1fInIYIjxX6r6vMdJz88BCWjpJ7//GgNjIWVBCkoicE4SIp7z7ygGtQrW L8F4Mg3XNcciu/zpe6D41PW/s8fwyUlfF0x+xlcc6rWRqotiOnDOGLpgjwBBYNGbZgRr afmg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :message-id:date:subject:cc:to:from:dkim-signature; bh=66biUXmBUUSHKCNZLVuHZ9fR3doYSQvRiXeKOrB3jZA=; b=0OYj2cPOO239k7dBfenD365RXWm3mSkbQqheqOyThJ4fukhhXlStmfvSAu2Rgd5pv9 1agbRHityy2ItGsY0LbL+kPSCzRO1itvbrx0PkWA+WgAAxNxPUL0Bd6P24r299JSlxnP l/YvkrM4Bs74jO7a4lSDR34DUv+YED6XicyAOKHC4R8rQFwS5S25S+PMTtnKXLrBpbVt DTWmjbsdoS4i1bEMznr+SLfnZ6Rc1l3AfcZQmFv0ZevXadlVTYrs6UIf3yavQuolpMNO O4lPdFLlFL9tzrs+UYA6MTwNAg5mGd7f+V0yjYLHRVLcDI5Wyk6xNsEyaLa4mZfcbGye igJg== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@gmail.com header.s=20210112 header.b=OeAZpcjJ; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id f14-20020a056402160e00b005024da27f37si5336904edv.510.2023.03.29.08.35.05; Wed, 29 Mar 2023 08:35:29 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20210112 header.b=OeAZpcjJ; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229525AbjC2Pdq (ORCPT + 99 others); Wed, 29 Mar 2023 11:33:46 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42840 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230113AbjC2Pdl (ORCPT ); Wed, 29 Mar 2023 11:33:41 -0400 Received: from mail-ed1-x52a.google.com (mail-ed1-x52a.google.com [IPv6:2a00:1450:4864:20::52a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3ABD6559A for ; Wed, 29 Mar 2023 08:33:33 -0700 (PDT) Received: by mail-ed1-x52a.google.com with SMTP id x3so64912462edb.10 for ; Wed, 29 Mar 2023 08:33:33 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; t=1680104011; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=66biUXmBUUSHKCNZLVuHZ9fR3doYSQvRiXeKOrB3jZA=; b=OeAZpcjJDky/tXcf7kE4FenhbpjfjKM+vaIRfMoNbpk0IPkVXPZQC7GhUNslotMoOQ lPrjgJz093PM9/np+N0rukxtnFFygPFnZ19N+66lNMc/7YvziOKuqWbnnX+yindByMaO 8zdJCoNtylnsW5zVbuEtGx3GUKmHtg4dIEfN0JHxiXFKvGekNgb1xSVZojyjgp8MCtcd wKBt29+C2ZM9NThM17NEEm6Q36AMsfps0IT+nmVBtCWJ1glWEXyflW6ZrkD722Fg5vSv 1ayi69VYvpgdlk1f5wrOzqWwbtF8RsmKH6PjEut3sQESby05JAocgxzXtKE+/YBpXdet rlVw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1680104011; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=66biUXmBUUSHKCNZLVuHZ9fR3doYSQvRiXeKOrB3jZA=; b=HfAdU45MH/JZnDksFTPsQi7W5Dzx4obDLCQ94k7XBTXDqw/s3FmDB/p79cWHFPoDUZ TVsdzFoWD+sgPl9Nx+iY08fuJx2V9dMMsFXG5KyVc71ZNoxQWaHu4sZQLVqrBiLcfsoT bnsq4oB7QlUnLnnf1oRjiIgOInP9h9FPCCRX0r0IWUQlKBRaWbhORl8k7KA6IBz/2FCB VhH+Eh0X/8qEs46h2A7KeuurJn+U1MioSZIp2tabYL5Vt9pbrxflcEvakFmUupHh4m+O mBLWVfqze2uu+5KJQDcWbfg357i0wmpVauvT1JPFXmb/7smv+ZZaMfejqWg94Z80a35P zTkg== X-Gm-Message-State: AAQBX9eaSPo6lRrzlEtL2514FP27ADxCNCkohppztKH/D4y2RjSGRDuV CW0jH/f0oSXKF/oRc8EXHI5Q2IMvbKsdeN49 X-Received: by 2002:a17:906:7189:b0:930:6591:15ee with SMTP id h9-20020a170906718900b00930659115eemr22105597ejk.10.1680104011222; Wed, 29 Mar 2023 08:33:31 -0700 (PDT) Received: from lelloman-5950.. (host-79-13-135-230.retail.telecomitalia.it. [79.13.135.230]) by smtp.gmail.com with ESMTPSA id g10-20020a17090670ca00b0093b8c0952e4sm10193735ejk.219.2023.03.29.08.33.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 29 Mar 2023 08:33:30 -0700 (PDT) From: Domenico Cerasuolo To: linux-kernel@vger.kernel.org Cc: peterz@infradead.org, surenb@google.com, brauner@kernel.org, chris@chrisdown.name, hannes@cmpxchg.org, Domenico Cerasuolo Subject: [PATCH v4 0/4] sched/psi: Allow unprivileged PSI polling Date: Wed, 29 Mar 2023 17:33:23 +0200 Message-Id: <20230329153327.140215-1-cerasuolodomenico@gmail.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 X-Spam-Status: No, score=-0.2 required=5.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM,RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1761687638825851119?= X-GMAIL-MSGID: =?utf-8?q?1761716867553554423?= PSI offers 2 mechanisms to get information about a specific resource pressure. One is reading from /proc/pressure/, which gives average pressures aggregated every 2s. The other is creating a pollable fd for a specific resource and cgroup. The trigger creation requires CAP_SYS_RESOURCE, and gives the possibility to pick specific time window and threshold, spawing an RT thread to aggregate the data. Systemd would like to provide containers the option to monitor pressure on their own cgroup and sub-cgroups. For example, if systemd launches a container that itself then launches services, the container should have the ability to poll() for pressure in individual services. But neither the container nor the services are privileged. The series is implemented in 4 steps in order to reduce the noise of the change. V4: - fixed psi_open leftover usage in IRQ accounting (patch 4/4) V3: - restored renaming patch (#2 of 4) as suggested in review - rebased #3 and #4 on the renaming commit V2: - removed renaming patch (previous 2/4) and applied suggested solution - changed update_triggers side effect removal as suggested in review - rebased core patch on other V2 changes Domenico Cerasuolo (4): sched/psi: rearrange polling code in preparation sched/psi: rename existing poll members in preparation sched/psi: extract update_triggers side effect sched/psi: allow unprivileged polling of N*2s period Documentation/accounting/psi.rst | 4 + include/linux/psi.h | 2 +- include/linux/psi_types.h | 43 +-- kernel/cgroup/cgroup.c | 2 +- kernel/sched/psi.c | 434 +++++++++++++++++-------------- 5 files changed, 263 insertions(+), 222 deletions(-)