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DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1772121226; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=xU/P/E3V8lwPxXOwsXyNuPVZtz8N/+iRJGqIf9l5sxM=; b=Wc4zCWkIgS5XtJECh5aP5VvL9yKzmdpAhKr4PRV3POE5wHpRbD6H94TOtEmbaEVtkxtXws oskHPmMw2POJ8xoJSPtCb2TUCMhPX/nKsJ+2R1cMI2eIiuLXW11sH5+DbgyYJtvlcyA+ih J5G33RbH6BBx/N4/J71ODoeh7VIN34A= From: Usama Arif To: Nico Pache Cc: Usama Arif , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-trace-kernel@vger.kernel.org, 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.Howlett@oracle.com, lorenzo.stoakes@oracle.com, 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 v15 12/13] mm/khugepaged: run khugepaged for all orders Date: Thu, 26 Feb 2026 07:53:31 -0800 Message-ID: <20260226155334.3373953-1-usama.arif@linux.dev> In-Reply-To: <20260226032650.234386-1-npache@redhat.com> References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: DA4E7140008 X-Stat-Signature: wyqywejs9cyffc9w93amezzbburk7xjh X-Rspam-User: X-HE-Tag: 1772121229-955440 X-HE-Meta: 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 w4odxiLw /mczxXGRGAbN+x+I80t6raRbOM65VqvbdBRmPXCk3DMsXy3F41/gMIjQbX+T80jBDvrRApjOjAsi0CjE6vhn1rFYl13qkm/AW0gfvKp57VPaXxoXssoWti7ngziJD4nHUsvO8VY2AHojQHRN8YLg3GyjE3m6y8s22l0BdxMgq6eAwdSBuNW/G6wnbGiojB6DDXmyyPAJDJkfu97OLOUoSOBUG+RTLc1WPW2lkJKyLQXT85U4hKdMmJfRZZ9KvYSkEjDM5nE7wefzP8ElTvm217u8XyJIvNp+sPI3je4lY9J7VdN+LwZwOSJFPXxb9AQxkSKMK Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Wed, 25 Feb 2026 20:26:50 -0700 Nico Pache wrote: > From: Baolin Wang > > If any order (m)THP is enabled we should allow running khugepaged to > attempt scanning and collapsing mTHPs. In order for khugepaged to operate > when only mTHP sizes are specified in sysfs, we must modify the predicate > function that determines whether it ought to run to do so. > > This function is currently called hugepage_pmd_enabled(), this patch > renames it to hugepage_enabled() and updates the logic to check to > determine whether any valid orders may exist which would justify > khugepaged running. > > We must also update collapse_allowable_orders() to check all orders if > the vma is anonymous and the collapse is khugepaged. > > After this patch khugepaged mTHP collapse is fully enabled. > > Signed-off-by: Baolin Wang > Signed-off-by: Nico Pache > --- > mm/khugepaged.c | 30 ++++++++++++++++++------------ > 1 file changed, 18 insertions(+), 12 deletions(-) > Acked-by: Usama Arif