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=-2.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 EF966C433FF for ; Tue, 30 Jul 2019 22:40:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C7941206A2 for ; Tue, 30 Jul 2019 22:40:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388217AbfG3WkG (ORCPT ); Tue, 30 Jul 2019 18:40:06 -0400 Received: from mga04.intel.com ([192.55.52.120]:25382 "EHLO mga04.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729318AbfG3WkF (ORCPT ); Tue, 30 Jul 2019 18:40:05 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga007.jf.intel.com ([10.7.209.58]) by fmsmga104.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 30 Jul 2019 15:40:05 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.64,327,1559545200"; d="scan'208";a="162868018" Received: from linux.intel.com ([10.54.29.200]) by orsmga007.jf.intel.com with ESMTP; 30 Jul 2019 15:40:05 -0700 Received: from [10.54.74.33] (skuppusw-desk.jf.intel.com [10.54.74.33]) by linux.intel.com (Postfix) with ESMTP id 52A6E58060A; Tue, 30 Jul 2019 15:40:05 -0700 (PDT) Reply-To: sathyanarayanan.kuppuswamy@linux.intel.com Subject: Re: [PATCH v1 1/1] mm/vmalloc.c: Fix percpu free VM area search criteria To: Uladzislau Rezki Cc: Dave Hansen , akpm@linux-foundation.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <20190729232139.91131-1-sathyanarayanan.kuppuswamy@linux.intel.com> <20190730204643.tsxgc3n4adb63rlc@pc636> <9fdd44c2-a10e-23f0-a71c-bf8f3e6fc384@linux.intel.com> <20190730223400.hzsyjrxng2s5gk4u@pc636> From: sathyanarayanan kuppuswamy Organization: Intel Message-ID: <63e48375-afa4-4ab6-240d-1633d7cc9ea4@linux.intel.com> Date: Tue, 30 Jul 2019 15:37:33 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.2 MIME-Version: 1.0 In-Reply-To: <20190730223400.hzsyjrxng2s5gk4u@pc636> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 7/30/19 3:34 PM, Uladzislau Rezki wrote: > Hello, Sathyanarayanan. > >> I agree with Dave. I don't think this issue is related to NUMA. The problem >> here is about the logic we use to find appropriate vm_area that satisfies >> the offset and size requirements of pcpu memory allocator. >> >> In my test case, I can reproduce this issue if we make request with offset >> (ffff000000) and size (600000). >> > Just to clarify, does it mean that on your setup you have only one area with the > 600000 size and 0xffff000000 offset? No, its 2 areas. with offset (0, ffff000000) and size (a00000, 600000). > > Thank you. > > -- > Vlad Rezki > -- Sathyanarayanan Kuppuswamy Linux kernel developer