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 X-Spam-Level: X-Spam-Status: No, score=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 94FA6C433E0 for ; Wed, 20 Jan 2021 16:33:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5C03423122 for ; Wed, 20 Jan 2021 16:33:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2403932AbhATQ0c (ORCPT ); Wed, 20 Jan 2021 11:26:32 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49022 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732183AbhATQWR (ORCPT ); Wed, 20 Jan 2021 11:22:17 -0500 Received: from mail-lf1-x134.google.com (mail-lf1-x134.google.com [IPv6:2a00:1450:4864:20::134]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2E048C061757; Wed, 20 Jan 2021 08:22:02 -0800 (PST) Received: by mail-lf1-x134.google.com with SMTP id v67so34887312lfa.0; Wed, 20 Jan 2021 08:22:02 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=kQPDCZoatrcIZYaKHvxiD9OMe09wtCmeCa1ffFLE0pQ=; b=oK1o0mvTLkqZuqgxDhACnwVUq1iCCF1/JPxOd4WM1XLisbxT1mC86LD+GO5XNlBMZO D1pxfsPVh2TzBhQEHB6WP91rbiCv6eOQVn9NhQNTFxY3PqAfrtpl8nuEfNfVK50dUtSx zSoF5az39Kii13ofyGrx7JoT+3tXb9+i1E51HYMDZug1vzP9Vx4RMfcYieU3vooZB9Oj 4u0xomTqFIlUK4tUQu2tuaBnYQiWBl0ifdwcsb5X1sVVJo5Xvb9lZnCHCeWax52aW4ua WkZuh6JjkPssKwmPwujRb+cZ7LvpkTG9GDQoAvNH7YQl43z+9cj6J3Wuqz4CcomlV5Z3 Uamw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=kQPDCZoatrcIZYaKHvxiD9OMe09wtCmeCa1ffFLE0pQ=; b=BBizLsZDuZEsyCOnF1WAN3Ez5M/kSz4lxLZ0a6hziJg55BcTm8Gqvrhy8p8lW36ftQ doyVNRZV6c5K5cW5xCtpIn7VzWwxluO1F74MIRflN0MeWRlwAeRi9LAx9++ATsSLUJfv ZUmF2AzkWoTEb17Vzt7vlR7t8hT+EKaXUl8dzH4e4cOx0q4zQZ11d76yWWkWfOpgmkgC rjG7xurD/Bzyzgrm9/gKRGb+rC4SeOyLCTzeEiJfbu35Z+HTFGbr4nzGtvE0mYbSTpDU pptAyi/v1xJosAGMMUav6CEJRKKbjyDZWHwCFbVLIXXmCy3nSvO/7yLHzkz9lJ5BUw/w zkHw== X-Gm-Message-State: AOAM532X8xMeJEPJvwRsbXylQLCZ4oRYlmfV/f68I5LNtdB5/oNDndew 1fVrN9lnWvkCeUE8eGrp18Viu5kdSChEoA== X-Google-Smtp-Source: ABdhPJxqOiiMIEzodSilxrtWZfzvUpDQmOJ69M+cNSNDws+NaDv2elPjTSOVAm9UgZ/YZ4JtfmuVDw== X-Received: by 2002:a19:3f01:: with SMTP id m1mr4371961lfa.203.1611159720673; Wed, 20 Jan 2021 08:22:00 -0800 (PST) Received: from pc638.lan (h5ef52e3d.seluork.dyn.perspektivbredband.net. [94.245.46.61]) by smtp.gmail.com with ESMTPSA id l8sm237631lfd.276.2021.01.20.08.21.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 20 Jan 2021 08:22:00 -0800 (PST) From: "Uladzislau Rezki (Sony)" To: LKML , RCU , "Paul E . McKenney" , Michael Ellerman Cc: Andrew Morton , Daniel Axtens , Frederic Weisbecker , Neeraj Upadhyay , Joel Fernandes , Peter Zijlstra , Michal Hocko , Thomas Gleixner , "Theodore Y . Ts'o" , Sebastian Andrzej Siewior , Uladzislau Rezki , Oleksiy Avramchenko Subject: [PATCH 2/3] kvfree_rcu: Use __GFP_NOMEMALLOC for single-argument kvfree_rcu() Date: Wed, 20 Jan 2021 17:21:47 +0100 Message-Id: <20210120162148.1973-2-urezki@gmail.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20210120162148.1973-1-urezki@gmail.com> References: <20210120162148.1973-1-urezki@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: rcu@vger.kernel.org From: "Paul E. McKenney" This commit applies the __GFP_NOMEMALLOC gfp flag to memory allocations carried out by the single-argument variant of kvfree_rcu(), thus avoiding this can-sleep code path from dipping into the emergency reserves. Acked-by: Michal Hocko Suggested-by: Michal Hocko Signed-off-by: Paul E. McKenney Signed-off-by: Uladzislau Rezki (Sony) --- kernel/rcu/tree.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index 2014fb22644d..454809514c91 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -3491,7 +3491,7 @@ add_ptr_to_bulk_krc_lock(struct kfree_rcu_cpu **krcp, if (!bnode && can_alloc) { krc_this_cpu_unlock(*krcp, *flags); bnode = (struct kvfree_rcu_bulk_data *) - __get_free_page(GFP_KERNEL | __GFP_RETRY_MAYFAIL | __GFP_NOWARN); + __get_free_page(GFP_KERNEL | __GFP_RETRY_MAYFAIL | __GFP_NOMEMALLOC | __GFP_NOWARN); *krcp = krc_this_cpu_lock(flags); } -- 2.20.1