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 327F7C19F2B for ; Fri, 29 Jul 2022 15:24:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237665AbiG2PY3 (ORCPT ); Fri, 29 Jul 2022 11:24:29 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52796 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237498AbiG2PYC (ORCPT ); Fri, 29 Jul 2022 11:24:02 -0400 Received: from mail-pj1-x1035.google.com (mail-pj1-x1035.google.com [IPv6:2607:f8b0:4864:20::1035]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F3B5D85FAD; Fri, 29 Jul 2022 08:23:46 -0700 (PDT) Received: by mail-pj1-x1035.google.com with SMTP id a7-20020a17090a008700b001f325db8b90so4154589pja.0; Fri, 29 Jul 2022 08:23:46 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=pNoGfDj1V1TnWI6qBdBSp31pmoo67RNKkb0LUb2vNLg=; b=L5yhSIt8gjsSmoj1o/cBW9AzyQHq5mIC+9at26SQ6hcp6bPNjtuU8B409uMpIMZulG QPxCn+2t9lkamdw4jzEf0G7zH9NHRcpwqv16qIJXXhJYDy5yKOj47BUrDDSVxTl9UkwT v9/v1FmerqehsorOy6r6RTfjjTPHyTpxQIEeQPNzVU2JKPvYvoBgpEtGQZpUiAJ1nqLi 3wkIv92UxZWulnBVltosq9eXBkLyzfnsQMRY6U+plLOjEM5r9evSaEkkJ1O4Vvl56u0l znIJhCMahnLYJnPpQcR8ECUaR1SL/ePMj83pAVrBVaC8Der/7J67vC6fQmZFhSNf1Wn4 c3/A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=pNoGfDj1V1TnWI6qBdBSp31pmoo67RNKkb0LUb2vNLg=; b=iBxNyiEoY8QVupmrde/cYDyY7mfn6SY+z3AVNpEALFCP3kG850lr4s+kq2PqMrTYOg 4IODF0wxEFIIROuQQLmEvv+hRzPjJrHnjTD+FRdnfzE7Nv0tgvdls4IKgbHUX0yPxPCL kKXgXdrwlr/nOYhuEa6qUtFn65BMHHQ+l8oMcmm4f8Z3SoFRP/+0DDg+w5wquBS98UjZ O5HNZ3tNkDQPv77NZ9mxabNfVcsM7wokdQZxaM8LBK1BSPtvmPn3290aTnpJsB+n3b9e iysR1UpKupnblli8ZninfQ0BciA0yVJeW9vAkOkbsWCzE+FzQluQNU40nHqBLizXLj/q qLHg== X-Gm-Message-State: ACgBeo3XNBbZR3j/JKK839d2yjZAHvbyNI+jJUjWKfcf+iGYtIUFaXZb LMIVUa/dl4X4AVtkBe4tJGA= X-Google-Smtp-Source: AA6agR6NHf7CpfGmFU7zV1EhZPCbkoe+KGvzl+qrAN+Jzzpvjgr18XBqTeZdgzhLr65Hfxz2R6a99Q== X-Received: by 2002:a17:902:e5cd:b0:16d:b92c:6848 with SMTP id u13-20020a170902e5cd00b0016db92c6848mr4335575plf.56.1659108226544; Fri, 29 Jul 2022 08:23:46 -0700 (PDT) Received: from vultr.guest ([2001:19f0:6001:2912:5400:4ff:fe16:4344]) by smtp.gmail.com with ESMTPSA id b12-20020a1709027e0c00b0016d3a354cffsm3714219plm.89.2022.07.29.08.23.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 29 Jul 2022 08:23:45 -0700 (PDT) From: Yafang Shao To: ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, kafai@fb.com, songliubraving@fb.com, yhs@fb.com, john.fastabend@gmail.com, kpsingh@kernel.org, sdf@google.com, haoluo@google.com, jolsa@kernel.org, hannes@cmpxchg.org, mhocko@kernel.org, roman.gushchin@linux.dev, shakeelb@google.com, songmuchun@bytedance.com, akpm@linux-foundation.org Cc: netdev@vger.kernel.org, bpf@vger.kernel.org, linux-mm@kvack.org, Yafang Shao Subject: [RFC PATCH bpf-next 12/15] mm, memcg: Add new helper get_obj_cgroup_from_cgroup Date: Fri, 29 Jul 2022 15:23:13 +0000 Message-Id: <20220729152316.58205-13-laoar.shao@gmail.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20220729152316.58205-1-laoar.shao@gmail.com> References: <20220729152316.58205-1-laoar.shao@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org Introduce new helper get_obj_cgroup_from_cgroup() to get obj_cgroup from a specific cgroup. Signed-off-by: Yafang Shao --- include/linux/memcontrol.h | 1 + mm/memcontrol.c | 41 ++++++++++++++++++++++++++++++++++++++ 2 files changed, 42 insertions(+) diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h index 2f0a611f12e5..901a9219fe9a 100644 --- a/include/linux/memcontrol.h +++ b/include/linux/memcontrol.h @@ -1713,6 +1713,7 @@ bool mem_cgroup_kmem_disabled(void); int __memcg_kmem_charge_page(struct page *page, gfp_t gfp, int order); void __memcg_kmem_uncharge_page(struct page *page, int order); +struct obj_cgroup *get_obj_cgroup_from_cgroup(struct cgroup *cgrp); struct obj_cgroup *get_obj_cgroup_from_current(void); struct obj_cgroup *get_obj_cgroup_from_page(struct page *page); diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 618c366a2f07..762cffae0320 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -2908,6 +2908,47 @@ static struct obj_cgroup *__get_obj_cgroup_from_memcg(struct mem_cgroup *memcg) return objcg; } +static struct obj_cgroup *get_obj_cgroup_from_memcg(struct mem_cgroup *memcg) +{ + struct obj_cgroup *objcg; + + if (memcg_kmem_bypass()) + return NULL; + + rcu_read_lock(); + objcg = __get_obj_cgroup_from_memcg(memcg); + rcu_read_unlock(); + return objcg; +} + +struct obj_cgroup *get_obj_cgroup_from_cgroup(struct cgroup *cgrp) +{ + struct cgroup_subsys_state *css; + struct mem_cgroup *memcg; + struct obj_cgroup *objcg; + + rcu_read_lock(); + css = rcu_dereference(cgrp->subsys[memory_cgrp_id]); + if (!css || !css_tryget_online(css)) { + rcu_read_unlock(); + cgroup_put(cgrp); + return ERR_PTR(-EINVAL); + } + rcu_read_unlock(); + cgroup_put(cgrp); + + memcg = mem_cgroup_from_css(css); + if (!memcg) { + css_put(css); + return ERR_PTR(-EINVAL); + } + + objcg = get_obj_cgroup_from_memcg(memcg); + css_put(css); + + return objcg; +} + __always_inline struct obj_cgroup *get_obj_cgroup_from_current(void) { struct obj_cgroup *objcg = NULL; -- 2.17.1