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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3BEE4C433EF for ; Fri, 20 May 2022 01:21:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344423AbiETBVs (ORCPT ); Thu, 19 May 2022 21:21:48 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55354 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1344389AbiETBVl (ORCPT ); Thu, 19 May 2022 21:21:41 -0400 Received: from mail-pf1-x44a.google.com (mail-pf1-x44a.google.com [IPv6:2607:f8b0:4864:20::44a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 410FE29817 for ; Thu, 19 May 2022 18:21:40 -0700 (PDT) Received: by mail-pf1-x44a.google.com with SMTP id t29-20020a056a00139d00b005107ebaefeaso3446932pfg.20 for ; Thu, 19 May 2022 18:21:40 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=69cx6mPg1rWURoZo4NX3ijOmJtwQkSNn64F/hEHNYSU=; b=BCreR+XUKTegtpZpREe5xPvg68UCcKsrUAIVbGh5bI2zogHrCn+YHLq0FMySF7Z8+U 3nTv8stgycmvTmhhg+YPkCLz4UYr3ZJz7474U4xhyJE3TKlT4rYlAp0vn5NBMmGoe2ov dgweabl3iJGlpFuwJTqJRwak1koJWau8g/NP85L4CjmiJUzSKn4LzPc2hkHvubatyBQP /96s5b/5xzfSh2L2JFvPZ2hVNpAhSiLyYoCG5VatpXZ/1CZSaKHDY0Xa+XvkgrFotW3c B1tX82bRy1h3iblza4rY3Q+jRM97bMVY3aW48bY0dTk7oUfdIoNGjySPHVcDY3xSepq3 Yujw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=69cx6mPg1rWURoZo4NX3ijOmJtwQkSNn64F/hEHNYSU=; b=sTAwLil3uHl2BEMTTKC7YpJo71kNTz2rpZ93IhOB8YQqsKL0iNFsbzZT7j1ThFyBKa jcAuAo1qIJL8LOniWXDTBGjuwsStJFH/BCZMJ4FTBd7SngPZ7sB33qVkbnBi2gPJg3ag iYWStfT7qLhxUn5n5Zrp3c4YKD94m/E+Kr6CTHw+7xlzRyhDzWE2qiKSijkHZGemq6oc Yl56bL37Vh1hJUTBCrNTEASmzkt+oDp3vby4e8kKe/o3ppGMylVEK3mj8g3YBqC5XvVD P/cgwpu7YO3y8IZE7IvQtOgivq5b/rXZXaRBpI/4VAUuyru4gyaxIX8hLngM3y8n5u58 zkpQ== X-Gm-Message-State: AOAM531A5ZqO8E16kBd1R80eNjquuc0FN5TJLWKVzaMZrWkf0xbLGPUw WZ2V35vMKcOzUViwMqM8Fti6u0qpc07wl4Mv X-Google-Smtp-Source: ABdhPJwhlm4uc6Arbp6IzP0EiWll+Bev9gm1/YHaZOBFW6aHkjOxNlzyA5wFDryaE/HeLy/GmQugBTe+SOD4g6uB X-Received: from yosry.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:2327]) (user=yosryahmed job=sendgmr) by 2002:a05:6a00:724:b0:4fa:a35f:8e0f with SMTP id 4-20020a056a00072400b004faa35f8e0fmr7557670pfm.25.1653009699699; Thu, 19 May 2022 18:21:39 -0700 (PDT) Date: Fri, 20 May 2022 01:21:29 +0000 In-Reply-To: <20220520012133.1217211-1-yosryahmed@google.com> Message-Id: <20220520012133.1217211-2-yosryahmed@google.com> Mime-Version: 1.0 References: <20220520012133.1217211-1-yosryahmed@google.com> X-Mailer: git-send-email 2.36.1.124.g0e6072fb45-goog Subject: [PATCH bpf-next v1 1/5] cgroup: bpf: add a hook for bpf progs to attach to rstat flushing From: Yosry Ahmed To: Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Song Liu , Yonghong Song , John Fastabend , KP Singh , Hao Luo , Tejun Heo , Zefan Li , Johannes Weiner , Shuah Khan , Roman Gushchin , Michal Hocko Cc: Stanislav Fomichev , David Rientjes , Greg Thelen , Shakeel Butt , linux-kernel@vger.kernel.org, netdev@vger.kernel.org, bpf@vger.kernel.org, cgroups@vger.kernel.org, Yosry Ahmed Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add an empty bpf_rstat_flush() hook that is called during rstat flushing. bpf programs that make use of rstat and want to flush their stats can attach to bpf_rstat_flush(). Signed-off-by: Yosry Ahmed --- kernel/cgroup/rstat.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/kernel/cgroup/rstat.c b/kernel/cgroup/rstat.c index 24b5c2ab5598..e7a88d2600bd 100644 --- a/kernel/cgroup/rstat.c +++ b/kernel/cgroup/rstat.c @@ -141,6 +141,12 @@ static struct cgroup *cgroup_rstat_cpu_pop_updated(struct cgroup *pos, return pos; } +/* A hook for bpf stat collectors to attach to and flush their stats */ +__weak noinline void bpf_rstat_flush(struct cgroup *cgrp, + struct cgroup *parent, int cpu) +{ +} + /* see cgroup_rstat_flush() */ static void cgroup_rstat_flush_locked(struct cgroup *cgrp, bool may_sleep) __releases(&cgroup_rstat_lock) __acquires(&cgroup_rstat_lock) @@ -168,6 +174,7 @@ static void cgroup_rstat_flush_locked(struct cgroup *cgrp, bool may_sleep) struct cgroup_subsys_state *css; cgroup_base_stat_flush(pos, cpu); + bpf_rstat_flush(pos, cgroup_parent(pos), cpu); rcu_read_lock(); list_for_each_entry_rcu(css, &pos->rstat_css_list, -- 2.36.1.124.g0e6072fb45-goog