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[172.10.233.147]) by smtp.gmail.com with ESMTPSA id 3f1490d57ef6-e842aaf16e0sm3927058276.22.2025.06.25.20.49.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 25 Jun 2025 20:49:37 -0700 (PDT) Date: Wed, 25 Jun 2025 20:49:27 -0700 (PDT) From: Hugh Dickins To: David Hildenbrand cc: Usama Arif , Lorenzo Stoakes , Hugh Dickins , Baolin Wang , akpm@linux-foundation.org, ziy@nvidia.com, Liam.Howlett@oracle.com, npache@redhat.com, ryan.roberts@arm.com, dev.jain@arm.com, baohua@kernel.org, zokeefe@google.com, shy828301@gmail.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Johannes Weiner Subject: Re: [PATCH v4 0/2] fix MADV_COLLAPSE issue if THP settings are disabled In-Reply-To: <8d019d60-80c6-4e2a-a2bd-3a2868dbaa3f@redhat.com> Message-ID: <37add58c-d395-b83a-fa1e-2d7ca799b4f0@google.com> References: <75c02dbf-4189-958d-515e-fa80bb2187fc@google.com> <008ec97f-3b33-4b47-a112-9cef8c1d7f58@redhat.com> <8d019d60-80c6-4e2a-a2bd-3a2868dbaa3f@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII X-Rspamd-Queue-Id: 6BECF1C000B X-Rspam-User: X-Rspamd-Server: rspam06 X-Stat-Signature: wniff47ibdpcn94znb4xu7gi5zhjg11z X-HE-Tag: 1750909780-719425 X-HE-Meta: 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 i7oPIQnP 8xmQTgmJGyIEihYquPaHL0652Bo0xccSRlcQAYHOk85YRsxNSfx37zQWpKji8DwPSMCR4ufrvkS77w1cU5E0JVBEgMBjyDu0jlHAXXWIIdAc5kp25tHrkgY/V4Ef/C+xEocb2dTp6fHzLBT+1IIETKb0plAd7e6xs9NfRlfXnpWlSnrvVfdHYfJfMB8TDlJE2Txh4j9HXDnFaTpDLGbKvsLpWb51Of7iO8vw5gD5cnJ46sIdWdPFfN9lRuiqiVBdmr218p9uLNJAd1F1Hnofhzbvkpg5wvAixMP8KCywncHjJUeiGmGR9OP2VQtmebXlbh2pcK/M5966FJGVbrEk/OxDbwsIKhGX2owoniRwDWEf43s7EFmH3eDAvtWwJ9H6mpULuKktzt3SFWsDnL6FuzQYIAg== 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: List-Subscribe: List-Unsubscribe: On Wed, 25 Jun 2025, David Hildenbrand wrote: > On 25.06.25 13:03, Usama Arif wrote: > > > > So I just wanted to throw another bad idea in the mix, what if we introduce > > another sysfs file > > (I hate introducing sysfs :)), something like /sys/kernel/mm/thp_allowed (or > > some other alternate name) > > which is default 1. > > Let's rather not :) :) Thank you all, I've read through and agreed with much and pondered, I wish wish wish I had something useful to add but do not, so shall just go quiet again ... ... but there seems to be no need for rush to decide on any change at all. Hugh