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[172.10.233.147]) by smtp.gmail.com with ESMTPSA id g14-20020a544f8e000000b0035437f4deefsm3423362oiy.26.2022.12.02.11.27.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 02 Dec 2022 11:27:33 -0800 (PST) Date: Fri, 2 Dec 2022 11:27:23 -0800 (PST) From: Hugh Dickins X-X-Sender: hugh@ripple.attlocal.net To: David Rientjes cc: Matthew Wilcox , ye.xingchen@zte.com.cn, akpm@linux-foundation.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] mm/huge_memory: add TRANSPARENT_HUGEPAGE_NEVER for THP In-Reply-To: <4a78abbc-4c07-2208-1072-af6d342c3f1a@google.com> Message-ID: <16b44431-5f9d-bfe4-049-4fd6a66e989a@google.com> References: <202211301651462590168@zte.com.cn> <4a78abbc-4c07-2208-1072-af6d342c3f1a@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII X-Rspam-User: X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: D99C91C000A X-Stat-Signature: 8me9ortkmi4bohrfqgwyng6b141th7xa X-Spamd-Result: default: False [-1.82 / 9.00]; BAYES_HAM(-5.92)[99.84%]; SORBS_IRL_BL(3.00)[209.85.167.175:from]; SUBJECT_HAS_UNDERSCORES(1.00)[]; MIME_GOOD(-0.10)[text/plain]; RCVD_NO_TLS_LAST(0.10)[]; BAD_REP_POLICIES(0.10)[]; DKIM_TRACE(0.00)[google.com:+]; TO_MATCH_ENVRCPT_SOME(0.00)[]; RCVD_COUNT_THREE(0.00)[3]; MIME_TRACE(0.00)[0:+]; FROM_EQ_ENVFROM(0.00)[]; DMARC_POLICY_ALLOW(0.00)[google.com,reject]; ARC_SIGNED(0.00)[hostedemail.com:s=arc-20220608:i=1]; MID_RHS_MATCH_FROM(0.00)[]; ARC_NA(0.00)[]; R_DKIM_ALLOW(0.00)[google.com:s=20210112]; RCPT_COUNT_FIVE(0.00)[6]; FROM_HAS_DN(0.00)[]; R_SPF_ALLOW(0.00)[+ip4:209.85.128.0/17]; TO_DN_SOME(0.00)[]; PREVIOUSLY_DELIVERED(0.00)[linux-mm@kvack.org]; RCVD_VIA_SMTP_AUTH(0.00)[] X-HE-Tag: 1670009256-757690 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, 2 Dec 2022, David Rientjes wrote: > On Thu, 1 Dec 2022, Matthew Wilcox wrote: > > On Wed, Nov 30, 2022 at 04:51:46PM +0800, ye.xingchen@zte.com.cn wrote: > > > From: ye xingchen > > > > > > Sometimes we may need the /sys/kernel/mm/transparent_hugepage/enabled to > > > default as [never] at the first time. > > > > What is going wrong with THP enabled that you need to disable it? > > > > That would be useful to know in addition to why this needs to be part of > .config and not simply using the kernel command line option. There is also the puzzle of what new feature gets added by #ifdef CONFIG_TRANSPARENT_HUGEPAGE_NEVER #endif Hugh