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]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 3140BCD8C92 for ; Mon, 8 Jun 2026 07:37:49 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 5CB766B0088; Mon, 8 Jun 2026 03:37:48 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 57CD96B008A; Mon, 8 Jun 2026 03:37:48 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 46B636B008C; Mon, 8 Jun 2026 03:37:48 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0011.hostedemail.com [216.40.44.11]) by kanga.kvack.org (Postfix) with ESMTP id 3998D6B0088 for ; Mon, 8 Jun 2026 03:37:48 -0400 (EDT) Received: from smtpin02.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay04.hostedemail.com (Postfix) with ESMTP id DEB7F1A099E for ; Mon, 8 Jun 2026 07:37:47 +0000 (UTC) X-FDA: 84855940974.02.392E90A Received: from out-177.mta1.migadu.com (out-177.mta1.migadu.com [95.215.58.177]) by imf23.hostedemail.com (Postfix) with ESMTP id 29C4F140006 for ; Mon, 8 Jun 2026 07:37:46 +0000 (UTC) Authentication-Results: imf23.hostedemail.com; dkim=pass header.d=linux.dev header.s=key1 header.b=Ak6sWILD; dmarc=pass (policy=none) header.from=linux.dev; spf=pass (imf23.hostedemail.com: domain of lance.yang@linux.dev designates 95.215.58.177 as permitted sender) smtp.mailfrom=lance.yang@linux.dev ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1780904266; 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:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=Wsy3SV/x9gKjvdWcQFrp0CjrpEuT+cadsrsidaj4rB8=; b=Xuq7j4ldm8jRnkhtMID4JD76eYOsnSpuNFN09hQ1FokVl55S8pe+jipH5O29viHZJ7Jh73 nsiihNvV/cn1Lww1WqKi/akf6XgKuprRKLCZLtUYYYAeGEMv09vLRRwZpd5+EllRcPEvza yGYpCHG12G9BYjZtTuEQsgXjCTjJE0E= ARC-Authentication-Results: i=1; imf23.hostedemail.com; dkim=pass header.d=linux.dev header.s=key1 header.b=Ak6sWILD; dmarc=pass (policy=none) header.from=linux.dev; spf=pass (imf23.hostedemail.com: domain of lance.yang@linux.dev designates 95.215.58.177 as permitted sender) smtp.mailfrom=lance.yang@linux.dev ARC-Seal: i=1; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1780904266; b=HRLhY+V7NWDDHcfNcc4OieIncfo+evZIjUadRPBMPIfXf3okWKD1JhcgCEHH/MrnvaH7rN 7iE3bxFBOTabNSi4I2h9ezIBjF0OH5xqj1W5sglXIMGqx2xFaGP9oRLWpdEGF17GCfI3Y4 uR2immGxQ0+/gpXUpynTeGS6pz8lWD8= X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1780904262; h=from:from: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:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=Wsy3SV/x9gKjvdWcQFrp0CjrpEuT+cadsrsidaj4rB8=; b=Ak6sWILDDx3J0D1mzuDOxeWn8ejkSI2YgDmzlNwy111F3FOcKNLITeLI7L5RS1mV3wHKKH SHYDnc4PExJJNYS6SWRZhJdtTLt84QeGYdYHR1KHKTSLnWprM08aXIk2QqdHZTt966lXoa /UgQul8jmc07M9P9KRQQLPUc+HzmVqs= From: Lance Yang To: npache@redhat.com Cc: linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-trace-kernel@vger.kernel.org, aarcange@redhat.com, akpm@linux-foundation.org, anshuman.khandual@arm.com, apopple@nvidia.com, baohua@kernel.org, baolin.wang@linux.alibaba.com, byungchul@sk.com, catalin.marinas@arm.com, cl@gentwo.org, corbet@lwn.net, dave.hansen@linux.intel.com, david@kernel.org, dev.jain@arm.com, gourry@gourry.net, hannes@cmpxchg.org, hughd@google.com, jack@suse.cz, jackmanb@google.com, jannh@google.com, jglisse@google.com, joshua.hahnjy@gmail.com, kas@kernel.org, lance.yang@linux.dev, liam@infradead.org, ljs@kernel.org, mathieu.desnoyers@efficios.com, matthew.brost@intel.com, mhiramat@kernel.org, mhocko@suse.com, peterx@redhat.com, pfalcato@suse.de, rakie.kim@sk.com, raquini@redhat.com, rdunlap@infradead.org, richard.weiyang@gmail.com, rientjes@google.com, rostedt@goodmis.org, rppt@kernel.org, ryan.roberts@arm.com, shivankg@amd.com, sunnanyong@huawei.com, surenb@google.com, thomas.hellstrom@linux.intel.com, tiwai@suse.de, usamaarif642@gmail.com, vbabka@suse.cz, vishal.moola@gmail.com, wangkefeng.wang@huawei.com, will@kernel.org, willy@infradead.org, yang@os.amperecomputing.com, ying.huang@linux.alibaba.com, ziy@nvidia.com, zokeefe@google.com, usama.arif@linux.dev Subject: Re: [PATCH mm-unstable v19 12/14] mm/khugepaged: avoid unnecessary mTHP collapse attempts Date: Mon, 8 Jun 2026 15:36:49 +0800 Message-Id: <20260608073649.99133-1-lance.yang@linux.dev> In-Reply-To: <20260605161422.213817-13-npache@redhat.com> References: <20260605161422.213817-13-npache@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 29C4F140006 X-Stat-Signature: xhm7n18h4w1xewcdcs4fxkm4fqkcx1s4 X-Rspam-User: X-HE-Tag: 1780904266-689063 X-HE-Meta: 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 R8pJ93eo 2BZuLNXN5KmJZ+bP0DJAG38Z+BWidOSQmVgUHFds4mGR8shDpMfXr446f/WeKbTRrr4u/s1DmsSuK0mQBmJ/ECus4MPPLi7VVJP0Vuuid/evuV/7jTFrnyxtYWT5i+X0zAZIKv38F/YRsJOGAs8Mga9m/OB9LdSD1yrRLbs+SPFm5tHNBs5O+Mr5EoyJ8ui3CtOViaaR+fy3TH6NnGe0RXIf5vLgtY0vjuAortSmzcrhI424SKfdyUvz4bAu+EaxI3RbxIisACVNsxclD5nki/RCIWI6SthPehfFXnFmt0wuU9o39vZPpfuFbLN4XxHHxNsf3B9QQeCsPduDfSdcVyrHQv6wUQHjj+hWG Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Fri, Jun 05, 2026 at 10:14:19AM -0600, Nico Pache wrote: >There are cases where, if an attempted collapse fails, all subsequent >orders are guaranteed to also fail. Avoid these collapse attempts by >bailing out early. > >Reviewed-by: Lorenzo Stoakes >Acked-by: Usama Arif >Acked-by: David Hildenbrand (Arm) >Signed-off-by: Nico Pache >--- Reviewed-by: Lance Yang