From patchwork Fri Nov 11 18:35:25 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: 13040715 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 0D9ACC4167E for ; Fri, 11 Nov 2022 18:37:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234237AbiKKShF (ORCPT ); Fri, 11 Nov 2022 13:37:05 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37840 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234273AbiKKSgS (ORCPT ); Fri, 11 Nov 2022 13:36:18 -0500 Received: from mga03.intel.com (mga03.intel.com [134.134.136.65]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B0225833B2; Fri, 11 Nov 2022 10:36:16 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1668191776; x=1699727776; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=YoGb4j/ZQ61R2iQhhmxSzGX3p7smajRdGWvm5NNdTBs=; b=AucB0PwBRMGpEItGXZUTWsmONUkG/FmfD9juI6gfUor9xA9+Ob2NTkFF L4B8WH1aia4/s3+82BeFJSj6aGiwK3REC5R9EgYxI5sA2aBq3zE0U1a85 k6tbUxOeztfpFY2iCr5AbjT4VX4nHMrQe+xO9lXXyJWVUAfnR5ZTZlaCA GgGYmNqEIumkHYiGU3Q1RTsPVj8AVy/yaRFb9KYt1Z/g1jrIJ/gYcLIrg NXbE6p2g2ovZuV42r9PEAd4VAaM8sZzyOgLI6k1YxTsCYWvs0WmgbTgd1 elqSIreDZevioZG43Ny0wU9B8UJi/nOwqh8t3PZtVRl6UAKBPCGGv8KOY Q==; X-IronPort-AV: E=McAfee;i="6500,9779,10528"; a="313447711" X-IronPort-AV: E=Sophos;i="5.96,157,1665471600"; d="scan'208";a="313447711" 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 10:36:16 -0800 X-IronPort-AV: E=McAfee;i="6500,9779,10528"; a="640089385" X-IronPort-AV: E=Sophos;i="5.96,157,1665471600"; d="scan'208";a="640089385" 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 10:36:15 -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 20/26] cgroup/misc: allow users of misc cgroup to read specific cgroup usage Date: Fri, 11 Nov 2022 10:35:25 -0800 Message-Id: <20221111183532.3676646-21-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 Add a function to return the current usage of the specified cgroup. The SGX driver will need this information to decide whether to reclaim EPC pages from a cgroup. Signed-off-by: Kristen Carlson Accardi --- include/linux/misc_cgroup.h | 6 ++++++ kernel/cgroup/misc.c | 19 +++++++++++++++++++ 2 files changed, 25 insertions(+) diff --git a/include/linux/misc_cgroup.h b/include/linux/misc_cgroup.h index d1aeb85f2ed6..a9dd087132dc 100644 --- a/include/linux/misc_cgroup.h +++ b/include/linux/misc_cgroup.h @@ -61,6 +61,7 @@ struct misc_cg { struct misc_cg *root_misc(void); struct misc_cg *parent_misc(struct misc_cg *cg); +unsigned long misc_cg_read(enum misc_res_type type, struct misc_cg *cg); 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, @@ -118,6 +119,11 @@ static inline struct misc_cg *parent_misc(struct misc_cg *cg) return NULL; } +static inline unsigned long misc_cg_read(enum misc_res_type type, struct misc_cg *cg) +{ + return 0; +} + static inline unsigned long misc_cg_res_total_usage(enum misc_res_type type) { return 0; diff --git a/kernel/cgroup/misc.c b/kernel/cgroup/misc.c index b22a055af9ad..e2c99fdc1d40 100644 --- a/kernel/cgroup/misc.c +++ b/kernel/cgroup/misc.c @@ -213,6 +213,25 @@ void misc_cg_uncharge(enum misc_res_type type, struct misc_cg *cg, } EXPORT_SYMBOL_GPL(misc_cg_uncharge); +/** + * misc_cg_read() - Return the current usage of the misc cgroup res. + * @type: Type of the misc res. + * @cg: Misc cgroup whose usage will be read + * + * Context: Any context. + * Return: + * The current total usage of the specified misc cgroup. + * If an invalid misc_res_type is given, zero will be returned. + */ +unsigned long misc_cg_read(enum misc_res_type type, struct misc_cg *cg) +{ + if (!(valid_type(type) && cg)) + return 0; + + return atomic_long_read(&cg->res[type].usage); +} +EXPORT_SYMBOL_GPL(misc_cg_read); + /** * misc_cg_max_show() - Show the misc cgroup max limit. * @sf: Interface file