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=-6.6 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=no 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 9A8D1C43464 for ; Fri, 18 Sep 2020 19:48:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 40C5723119 for ; Fri, 18 Sep 2020 19:48:43 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="nqW26T8O" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726308AbgIRTsk (ORCPT ); Fri, 18 Sep 2020 15:48:40 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48624 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726159AbgIRTsj (ORCPT ); Fri, 18 Sep 2020 15:48:39 -0400 Received: from mail-lj1-x241.google.com (mail-lj1-x241.google.com [IPv6:2a00:1450:4864:20::241]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 26710C0613CE; Fri, 18 Sep 2020 12:48:39 -0700 (PDT) Received: by mail-lj1-x241.google.com with SMTP id a22so5983292ljp.13; Fri, 18 Sep 2020 12:48:39 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=rGRBhoEIYM+I62uhtkzSGBAX+5us/YHtB+9Vgg1zTtY=; b=nqW26T8OmNe5+E2dLewM6NhPfcOBIFPhxmshxeaPCd3/CNcEzUwyciqvYOimc4nCWZ d6ahQ6xO9c03qe4fnvRVpFbGe3BbO1F1IHkhs2HizzY1bNziXGzJsPgkJuMLsmHp7bER +BBGfCAMJKqezojoPek2mjW4+mNscce+qsljzbS+zhN3rZxZuCpll8pE+/SZoUXjyFv8 1e41FNCJ5E+DyfiQ78Zf/NKrs9oSsjn0tqD+aAW+GFem3xNt73k94D7Rwdv6hTFW/t8V iEfTfleACAerSnWZOqjud72CkZnzAffr45ahnqzqWLSxtoDTEiB4TKyjLspPkgh4uTQ5 LT3A== 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:mime-version :content-transfer-encoding; bh=rGRBhoEIYM+I62uhtkzSGBAX+5us/YHtB+9Vgg1zTtY=; b=Qzz9KXjpq93RRi/PMYF0mVQigA7KTmZ6bw4ZAmytJON3pgfgJ6N7rNeD3NY1+RqtHg u7fng0tUltwIsplDWcIv5K1BtDeJiL3j5RbVtV4fXMHFm8kgKMsWQoJmknf+fTSEPQ0X VWeNw1KD6Wv1xHce/iDEkcAbyYHwAeDxPq0fmoM3jW9wbLQq+YRBxq9D8Tu+d+cGFrZr DgmgSTHsI6VLNwW+OP8niSitlr6xUOKbglwDi8qEk9n+NnXETS90Bzsfi0ktQjOVeV2K AskzMLDP/HkW4ziQZLdf6ah1Z09ZkL+TFqD+JH1q/wxoD+b45Je2yzPoUZTtqq/yu3Nd 8Xvg== X-Gm-Message-State: AOAM530EOLmeNPIpC56TZ74sbCBIYVOuadw5jy2OYrQROrpSlWzVHdAU zYIyd3JxhvwvNtnkG8354di1eJHo66fjQ378 X-Google-Smtp-Source: ABdhPJyn9sqZurK+0ib9MIFAesyL3MylhyXr116ZbhuJNj3ywoGWgVAqgvt4drq460J31feLyaJP+w== X-Received: by 2002:a2e:b6cd:: with SMTP id m13mr13092130ljo.383.1600458517144; Fri, 18 Sep 2020 12:48:37 -0700 (PDT) Received: from pc638.lan (h5ef52e31.seluork.dyn.perspektivbredband.net. [94.245.46.49]) by smtp.gmail.com with ESMTPSA id a17sm766769lfd.148.2020.09.18.12.48.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 18 Sep 2020 12:48:36 -0700 (PDT) From: "Uladzislau Rezki (Sony)" To: LKML , RCU , linux-mm@kvack.org, Andrew Morton , "Paul E . McKenney" Cc: Peter Zijlstra , Michal Hocko , Vlastimil Babka , Thomas Gleixner , "Theodore Y . Ts'o" , Joel Fernandes , Sebastian Andrzej Siewior , Uladzislau Rezki , Oleksiy Avramchenko Subject: [PATCH 0/4] kvfree_rcu() and _LOCK_NESTING/_PREEMPT_RT Date: Fri, 18 Sep 2020 21:48:13 +0200 Message-Id: <20200918194817.48921-1-urezki@gmail.com> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, folk! This is another iteration of fixing kvfree_rcu() issues related to CONFIG_PROVE_RAW_LOCK_NESTING and CONFIG_PREEMPT_RT configs. The first discussion is here https://lkml.org/lkml/2020/8/9/195. - As an outcome of it, there was a proposal from Peter, instead of using a speciall "lock-less" flag it is better to move lock-less access to the pcplist to the separate function. - To add a special worker thread that does prefetching of pages if a per-cpu page cache is depleted(what is absolutely normal). As usual, thank you for paying attention to it and your help! Uladzislau Rezki (Sony) (4): rcu/tree: Add a work to allocate pages from regular context mm: Add __rcu_alloc_page_lockless() func. rcu/tree: use __rcu_alloc_page_lockless() func. rcu/tree: Use schedule_delayed_work() instead of WQ_HIGHPRI queue include/linux/gfp.h | 1 + kernel/rcu/tree.c | 90 ++++++++++++++++++++++++--------------------- mm/page_alloc.c | 82 +++++++++++++++++++++++++++++++++++++++++ 3 files changed, 132 insertions(+), 41 deletions(-) -- 2.20.1