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 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 82B14C43334 for ; Fri, 22 Jul 2022 15:38:27 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 0CA856B0073; Fri, 22 Jul 2022 11:38:27 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 07A226B0074; Fri, 22 Jul 2022 11:38:27 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id EAC3A6B0075; Fri, 22 Jul 2022 11:38:26 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0015.hostedemail.com [216.40.44.15]) by kanga.kvack.org (Postfix) with ESMTP id DBDAE6B0073 for ; Fri, 22 Jul 2022 11:38:26 -0400 (EDT) Received: from smtpin19.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay06.hostedemail.com (Postfix) with ESMTP id BCB43AB073 for ; Fri, 22 Jul 2022 15:38:26 +0000 (UTC) X-FDA: 79715142612.19.FBE2E78 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) by imf17.hostedemail.com (Postfix) with ESMTP id B42064009E for ; Fri, 22 Jul 2022 15:38:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=mPAaLzKrMkLU/j896UlfyBtfiHZAkgGnP04Whg2NtOg=; b=l4osDtjE0GmEvzuUlYNsmG/MI5 tetjI/Dgh0iTmOZvSOSuQjMxiiGldA/ZpitljGNfD2qq0d9TK0eJt6cr7a0olSjXxG+Fgus2gnWp3 p9x8xY89IuJkW7/G1igBgvf3WdNj7XM1ykqsQeXKWJfrDa7puF6m8ZEN/3lcskhJwIqYm1PCZ9YvH mZw+TCnmhCsI+QEOVBpFcCkYDlscHS6znPQcp/yLjGJeuVGI/JIhsgFUZLnaFvDjye4+BdA4u2CiA 0YOSU6D9w6YnacN/tY5sxYR0+pDAcvnX/b5rA+8J2L8y9a/g2QdqOYFePbVphGgyQ2B8IWZnp99ap gADC30uQ==; Received: from willy by casper.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1oEuj6-00GPvC-Mg; Fri, 22 Jul 2022 15:38:04 +0000 Date: Fri, 22 Jul 2022 16:38:04 +0100 From: Matthew Wilcox To: Kassey Li Cc: akpm@linux-foundation.org, minchan@kernel.org, iamjoonsoo.kim@lge.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH] mm/page_owner.c: allow page_owner with given start_pfn/count Message-ID: References: <20220722150810.27740-1-quic_yingangl@quicinc.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20220722150810.27740-1-quic_yingangl@quicinc.com> ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1658504305; a=rsa-sha256; cv=none; b=2S8kGkX4goIajkoEnQVNSxMP+LC90wq/BoYui00VOJIvOe6UzaCQDLVomJSAEPAyWLhaEX n06ogdH+FY7A/N2aAb73SKkruvTHYLyeucBQJynuEJniXSDNMfrnudPgewaSrtstr+SOkr iRs48iGU8H29pFyE+MZJTTIPjVHleCY= ARC-Authentication-Results: i=1; imf17.hostedemail.com; dkim=pass header.d=infradead.org header.s=casper.20170209 header.b=l4osDtjE; dmarc=none; spf=none (imf17.hostedemail.com: domain of willy@infradead.org has no SPF policy when checking 90.155.50.34) smtp.mailfrom=willy@infradead.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1658504305; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=mPAaLzKrMkLU/j896UlfyBtfiHZAkgGnP04Whg2NtOg=; b=jtSiDREk3SJFVILGBnJN0qLYaRng8javohth+CK3iKDMineGebMkAaRNY+gLLYqD3azoUz Cb0Wyv0bNh8QHitQDo2bySvMZgXydFo9sz1GjwI90mmed2C6dX2OaIrM8ZjJYR8rdh3oTR ehfxwqh8cdxUSFjIyj23ahYU3lQIFWQ= X-Rspamd-Queue-Id: B42064009E Authentication-Results: imf17.hostedemail.com; dkim=pass header.d=infradead.org header.s=casper.20170209 header.b=l4osDtjE; dmarc=none; spf=none (imf17.hostedemail.com: domain of willy@infradead.org has no SPF policy when checking 90.155.50.34) smtp.mailfrom=willy@infradead.org X-Rspam-User: X-Rspamd-Server: rspam03 X-Stat-Signature: pqsftbyy6to8rpuof5mq4w7gs887iefj X-HE-Tag: 1658504304-998835 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 Fri, Jul 22, 2022 at 11:08:10PM +0800, Kassey Li wrote: > by default, page_owner iterates all page from min_low_pfn to > max_pfn, this cost too much time if we want an alternative pfn range. > > with this patch it allows user to set pfn range to dump the page_onwer. This is a really bad UI. If two users try to do different ranges at the same time, it'll go wrong. What use cases are you actually trying to solve?