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a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1766050400; bh=L8BJRVo1tLN2SwwHEUQ2duZ+GDJlKDOk1B9Tn8CK80Y=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=oE3IuCqKlINhrjN+LbsSoFCb4Fk6JTMP3JgEpmraKrWva7NphDNjskczSajTGp3Ap rgKU9CRcmqVwfBciC5u4L6LMEnsq0Q4CnnpLBzevTJomAG945kJUkP4jRys9399GqT WYYPmW/UKoK5iz4E7ahj0eHx19NmMXjsQTZqzR1QdZYy8eQJnQSoMvaqnIQ04R5wrd TG+m4InTLhOtUn0l06CWiBCGiHp+7h6VHjmeV5CY65sR4eXAYoMtcYFhe9feK8KiXB LEK3QkwBRwCHyE/LcnOc7IVhPLpXSn1sUAaqS64+xfc+dqh1iMc+SIXEMYau8fup3j myWaBWCkb1sLQ== Message-ID: <11025f1c-88d3-41a9-8290-21a9565e9bc3@kernel.org> Date: Thu, 18 Dec 2025 10:33:16 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 4/4] mm: khugepaged: set to next mm direct when mm has MMF_DISABLE_THP_COMPLETELY To: Vernon Yang , akpm@linux-foundation.org, lorenzo.stoakes@oracle.com Cc: ziy@nvidia.com, npache@redhat.com, baohua@kernel.org, lance.yang@linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Vernon Yang References: <20251215090419.174418-1-yanglincheng@kylinos.cn> <20251215090419.174418-5-yanglincheng@kylinos.cn> From: "David Hildenbrand (Red Hat)" Content-Language: en-US In-Reply-To: <20251215090419.174418-5-yanglincheng@kylinos.cn> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: C20E04000A X-Rspamd-Server: rspam03 X-Stat-Signature: mk7mnaz6uimzfyt86176im533zbfyzpa X-Rspam-User: X-HE-Tag: 1766050401-103012 X-HE-Meta: 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 Fd5zJD7g Xw23cTlRIG72WimR6VrHFgt+lxQ4UG5b6a+d//YXIj7vjmYEFp3CpId1AuvBWheoP9ykn/jWhikSdkCK7FLDnX7nNM6ibpeSdjgmxNJRbnbXRqrqn1ALS/wHMTi2XPgseFR92c3WvOEI93QzSbfACEkzR7Yd9HQT3D+KXStZHhmhgoC09nVaSsl8SMaYpOT0KZAsF2HgnpdRf1s4ryODyg9TS2b72KELL5db1S1y+xLw+57yBgn6iBlDKSbeqlwNc/GDrI+oTKHIBtfTGpWivFdTjXSKmOJoMx0ssYs1Xoms8g4najtznCfVp8g== 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 12/15/25 10:04, Vernon Yang wrote: > When an mm with the MMF_DISABLE_THP_COMPLETELY flag is detected during > scanning, directly set khugepaged_scan.mm_slot to the next mm_slot, > reduce redundant operation. That conceptually makes sense to me. How much does that safe in practice? Do you have some performance numbers for processes with rather large number of VMAs? -- Cheers David