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=-10.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=ham 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 61151C4320E for ; Wed, 25 Aug 2021 18:08:40 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 222C3610C9 for ; Wed, 25 Aug 2021 18:08:40 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 222C3610C9 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvack.org Received: by kanga.kvack.org (Postfix) id A13C26B0071; Wed, 25 Aug 2021 14:08:39 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 9C3C36B0072; Wed, 25 Aug 2021 14:08:39 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 8D9126B0073; Wed, 25 Aug 2021 14:08:39 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0251.hostedemail.com [216.40.44.251]) by kanga.kvack.org (Postfix) with ESMTP id 6E7836B0071 for ; Wed, 25 Aug 2021 14:08:39 -0400 (EDT) Received: from smtpin01.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id 03FA21801C403 for ; Wed, 25 Aug 2021 18:08:39 +0000 (UTC) X-FDA: 78514388358.01.D00327C Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf22.hostedemail.com (Postfix) with ESMTP id 8F9F4190D for ; Wed, 25 Aug 2021 18:08:38 +0000 (UTC) Received: by mail.kernel.org (Postfix) with ESMTPSA id 14A8460EBD; Wed, 25 Aug 2021 18:08:35 +0000 (UTC) Date: Wed, 25 Aug 2021 19:08:33 +0100 From: Catalin Marinas To: Kefeng Wang Cc: will@kernel.org, ryabinin.a.a@gmail.com, andreyknvl@gmail.com, dvyukov@google.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com, linux-mm@kvack.org, elver@google.com Subject: Re: [PATCH v3 2/3] arm64: Support page mapping percpu first chunk allocator Message-ID: <20210825180831.GJ3420@arm.com> References: <20210809093750.131091-1-wangkefeng.wang@huawei.com> <20210809093750.131091-3-wangkefeng.wang@huawei.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210809093750.131091-3-wangkefeng.wang@huawei.com> User-Agent: Mutt/1.10.1 (2018-07-13) X-Rspamd-Queue-Id: 8F9F4190D Authentication-Results: imf22.hostedemail.com; dkim=none; dmarc=fail reason="SPF not aligned (relaxed), No valid DKIM" header.from=arm.com (policy=none); spf=pass (imf22.hostedemail.com: domain of cmarinas@kernel.org designates 198.145.29.99 as permitted sender) smtp.mailfrom=cmarinas@kernel.org X-Rspamd-Server: rspam01 X-Stat-Signature: akgykcdsqwnn9bh79x8xwwbqxuu8eo9y X-HE-Tag: 1629914918-880677 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Mon, Aug 09, 2021 at 05:37:49PM +0800, Kefeng Wang wrote: > Percpu embedded first chunk allocator is the firstly option, but it > could fails on ARM64, eg, > "percpu: max_distance=0x5fcfdc640000 too large for vmalloc space 0x781fefff0000" > "percpu: max_distance=0x600000540000 too large for vmalloc space 0x7dffb7ff0000" > "percpu: max_distance=0x5fff9adb0000 too large for vmalloc space 0x5dffb7ff0000" > > then we could meet "WARNING: CPU: 15 PID: 461 at vmalloc.c:3087 pcpu_get_vm_areas+0x488/0x838", > even the system could not boot successfully. > > Let's implement page mapping percpu first chunk allocator as a fallback > to the embedding allocator to increase the robustness of the system. > > Signed-off-by: Kefeng Wang Reviewed-by: Catalin Marinas