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DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1780903686; 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=o+UEQbg6AU+TfmK805SP5EpbQqdODkwRVAGdZoxB4k0=; b=JpHaj0hzUy6GWQsoTGmReTbCiT4mzU8p/9whZkTeag+RVJS1KqdqB4P11lEZ5gdN3qeXnk Sc4Wh0u1hgK7ingH1qu7mkNb3ZzFeUCmIzLy5JbnPQinOCngV6DG7j0F77wzzvoaUgYYG9 aNWKbMFCupxYA3dOUJp1SES55xPBXCk= 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 Subject: Re: [PATCH mm-unstable v19 10/14] mm/khugepaged: introduce collapse_possible_orders helper functions Date: Mon, 8 Jun 2026 15:27:47 +0800 Message-Id: <20260608072747.88417-1-lance.yang@linux.dev> In-Reply-To: <20260605161422.213817-11-npache@redhat.com> References: <20260605161422.213817-11-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: rspam11 X-Rspamd-Queue-Id: 2753C120003 X-Rspam-User: X-Stat-Signature: 6trmkfc1m73d8cqme578s15zzf9jgy5h X-HE-Tag: 1780903689-274899 X-HE-Meta: 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 MyiP9Jcl tcQ2f6cRU9TjCSdlSwtzHg3AgcNNa/MqoG4RPoqlYBI1pwdNLQZgJw4uYPJSNNpahYBSF1Xeml5ANvJAPJIGd1PLO4rByhT+XJfeGYnmyg2494PjP3nuVTVAQDd+kM4mX7mhsXgbJ2uGzbblp3pnJELpAwc4O5pyGJgm2uXm2CbcxhkPVd4GGw9S/xird3j2yh0lL1hb2KpXTGCjNJ7CDyAz89dzpJvTvRO61rsdoTRe/OtNeKmTdZ3Hn391TMiSGhFj2/aCwwt2u88r2VJUEthZy7clBx+3tZ+77OAj9muWETNgyW57xfmxfMugnxp+Zew3XgOIfV1LP13AP8ZDRfgjkXpv63NVE4FIRdTYJpQe7ZcO1qxhPqtaLBVGJXJjBrC1KX7xk+xAxLGR7LMp8ITYvOw== 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 10:14:17AM -0600, Nico Pache wrote: >Add collapse_possible_orders() to generalize THP order eligibility. The >function determines which THP orders are permitted based on collapse >context (khugepaged vs madv_collapse). We also add collapse_possible() >as a thin wrapper around collapse_possible_orders() that returns a bool >rather than the whole bitmap. > >This consolidates collapse configuration logic and provides a clean >interface for future mTHP collapse support where the orders may be >different. > >Acked-by: David Hildenbrand (Arm) >Reviewed-by: Baolin Wang >Signed-off-by: Nico Pache >--- Reviewed-by: Lance Yang