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 2CA14CA9ECF for ; Fri, 1 Nov 2019 22:32:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 00B3020679 for ; Fri, 1 Nov 2019 22:32:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727656AbfKAWcK (ORCPT ); Fri, 1 Nov 2019 18:32:10 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:21306 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727029AbfKAWcK (ORCPT ); Fri, 1 Nov 2019 18:32:10 -0400 Received: from pps.filterd (m0098419.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id xA1MRQmw128218; Fri, 1 Nov 2019 18:32:07 -0400 Received: from pps.reinject (localhost [127.0.0.1]) by mx0b-001b2d01.pphosted.com with ESMTP id 2w0w608mag-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 01 Nov 2019 18:32:07 -0400 Received: from m0098419.ppops.net (m0098419.ppops.net [127.0.0.1]) by pps.reinject (8.16.0.27/8.16.0.27) with SMTP id xA1MRlKh128696; Fri, 1 Nov 2019 18:32:06 -0400 Received: from ppma04wdc.us.ibm.com (1a.90.2fa9.ip4.static.sl-reverse.com [169.47.144.26]) by mx0b-001b2d01.pphosted.com with ESMTP id 2w0w608ma9-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 01 Nov 2019 18:32:06 -0400 Received: from pps.filterd (ppma04wdc.us.ibm.com [127.0.0.1]) by ppma04wdc.us.ibm.com (8.16.0.27/8.16.0.27) with SMTP id xA1MTaWu015753; Fri, 1 Nov 2019 22:32:06 GMT Received: from b03cxnp08028.gho.boulder.ibm.com (b03cxnp08028.gho.boulder.ibm.com [9.17.130.20]) by ppma04wdc.us.ibm.com with ESMTP id 2vxwh5v6yx-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 01 Nov 2019 22:32:06 +0000 Received: from b03ledav002.gho.boulder.ibm.com (b03ledav002.gho.boulder.ibm.com [9.17.130.233]) by b03cxnp08028.gho.boulder.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id xA1MW5Gf13107572 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 1 Nov 2019 22:32:05 GMT Received: from b03ledav002.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 08ACD136068; Fri, 1 Nov 2019 22:32:05 +0000 (GMT) Received: from b03ledav002.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id A8BE2136051; Fri, 1 Nov 2019 22:32:03 +0000 (GMT) Received: from [9.85.179.177] (unknown [9.85.179.177]) by b03ledav002.gho.boulder.ibm.com (Postfix) with ESMTP; Fri, 1 Nov 2019 22:32:03 +0000 (GMT) Subject: Re: [PATCH] drivers/base/memory.c: memory subsys init: skip search for missing blocks To: David Hildenbrand , Scott Cheloha , linux-kernel@vger.kernel.org, "Rafael J. Wysocki" , Greg Kroah-Hartman Cc: nathanl@linux.ibm.com References: <20191101181054.11521-1-cheloha@linux.vnet.ibm.com> From: Rick Lindsley Message-ID: Date: Fri, 1 Nov 2019 15:32:02 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.9.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-11-01_08:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1011 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=664 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1908290000 definitions=main-1911010208 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 11/1/19 12:00 PM, David Hildenbrand wrote: > > No, I don't really like that. Can we please speed up the lookup via a radix tree as noted in the comment of "find_memory_block()". I agree with the general sentiment that a redesign is the correct long term action - it has been for some time now - but implementing a new storage and retrieval method and verifying that it introduces no new problems itself is non-trivial. There's a reason it remains a comment. I don't see any issues with the patch itself. Do we really want to forego the short term, low-hanging, low risk fruit in favor of waiting indefinitely for that well-tested long-term solution? Rick