From patchwork Fri Nov 11 18:35:23 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kristen Carlson Accardi X-Patchwork-Id: 13040708 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 12C4CC433FE for ; Fri, 11 Nov 2022 18:37:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233900AbiKKShA (ORCPT ); Fri, 11 Nov 2022 13:37:00 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37722 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234234AbiKKSgO (ORCPT ); Fri, 11 Nov 2022 13:36:14 -0500 Received: from mga03.intel.com (mga03.intel.com [134.134.136.65]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2775083381; Fri, 11 Nov 2022 10:36:14 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1668191774; x=1699727774; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=wY8Ia7AhZOsSBmUDim+2xlwCX7VM8EjOrhb9ezVOttc=; b=CP7moDwxZdBbz+ai2ISJn8ohwUFqPbFTnZc97wcRrphBU0tPUK4mn+NE nyfu8SRGvGBGTFkAeEn0CC2GPcfgqadZFqgvf9K409D+kr+YJ4DrYLu8M n+P9994qJ5tAXS9OvBSOILxZ3HifnVKcw7tX/01ArQLXeMee4eeyd1kxk SW4XREmyq3/IOEZC+N/rQ+pbzFL9JBFip+CYyJQfShUWfYa+48tNcTf4k oM3osAoLXgCL/iXLyU/HRtkxM8V4kriPg2lYt5WiLWTdoFrMbguyMNmh8 PcJjgbjMOBum5JAG3l3/lNKgb6BWJFdOjIcBh7hEUztb5tFaBDbME77nY Q==; X-IronPort-AV: E=McAfee;i="6500,9779,10528"; a="313447706" X-IronPort-AV: E=Sophos;i="5.96,157,1665471600"; d="scan'208";a="313447706" Received: from fmsmga007.fm.intel.com ([10.253.24.52]) by orsmga103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 11 Nov 2022 10:36:13 -0800 X-IronPort-AV: E=McAfee;i="6500,9779,10528"; a="640089360" X-IronPort-AV: E=Sophos;i="5.96,157,1665471600"; d="scan'208";a="640089360" Received: from hermesli-mobl.amr.corp.intel.com (HELO kcaccard-desk.amr.corp.intel.com) ([10.212.218.5]) by fmsmga007-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 11 Nov 2022 10:36:12 -0800 From: Kristen Carlson Accardi To: jarkko@kernel.org, dave.hansen@linux.kernel.org, tj@kernel.org, linux-kernel@vger.kernel.org, linux-sgx@vger.kernel.org, cgroups@vger.kernel.org, Zefan Li , Johannes Weiner Cc: zhiquan1.li@intel.com, Kristen Carlson Accardi Subject: [PATCH 18/26] cgroup/misc: Expose root_misc Date: Fri, 11 Nov 2022 10:35:23 -0800 Message-Id: <20221111183532.3676646-19-kristen@linux.intel.com> X-Mailer: git-send-email 2.37.3 In-Reply-To: <20221111183532.3676646-1-kristen@linux.intel.com> References: <20221111183532.3676646-1-kristen@linux.intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-sgx@vger.kernel.org The SGX driver will need to get access to the root misc_cg object to do iterative walks and also determine if a charge will be towards the root cgroup or not. Signed-off-by: Kristen Carlson Accardi --- include/linux/misc_cgroup.h | 5 +++++ kernel/cgroup/misc.c | 9 +++++++++ 2 files changed, 14 insertions(+) diff --git a/include/linux/misc_cgroup.h b/include/linux/misc_cgroup.h index 8f1b7b6cb81d..b79c78378f17 100644 --- a/include/linux/misc_cgroup.h +++ b/include/linux/misc_cgroup.h @@ -59,6 +59,7 @@ struct misc_cg { struct misc_res res[MISC_CG_RES_TYPES]; }; +struct misc_cg *root_misc(void); unsigned long misc_cg_res_total_usage(enum misc_res_type type); int misc_cg_set_capacity(enum misc_res_type type, unsigned long capacity); int misc_cg_try_charge(enum misc_res_type type, struct misc_cg *cg, @@ -106,6 +107,10 @@ static inline void put_misc_cg(struct misc_cg *cg) } #else /* !CONFIG_CGROUP_MISC */ +static inline struct misc_cg *root_misc(void) +{ + return NULL; +} static inline unsigned long misc_cg_res_total_usage(enum misc_res_type type) { diff --git a/kernel/cgroup/misc.c b/kernel/cgroup/misc.c index 1e93e1d20347..8aa994d9cd02 100644 --- a/kernel/cgroup/misc.c +++ b/kernel/cgroup/misc.c @@ -45,6 +45,15 @@ static unsigned long misc_res_capacity[MISC_CG_RES_TYPES]; */ static BLOCKING_NOTIFIER_HEAD(misc_cg_notify_list); +/** + * root_misc() - Return the root misc cgroup. + */ +struct misc_cg *root_misc(void) +{ + return &root_cg; +} +EXPORT_SYMBOL_GPL(root_misc); + /** * parent_misc() - Get the parent of the passed misc cgroup. * @cgroup: cgroup whose parent needs to be fetched.