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bh=2eWXoJbsmPACrUiEI6Qes7YghoFFmPaabwm8a5YUjvg=; b=hcHM9UjY2WcIxUhWAQ5bfTfhnUDaIvNt0zTL1QGxytCGn2/Pt1JuQgl1O0B0c0Fh/k8xYl oozFDDllzS8gho4Q4Og9D95QhNfRy1QGX8kbN1RLp3JQnpqqz+1U/c8eQ6A/QKdH86EyDK Z8/Ka4vBvFI7rJ5OHYy9hYwxrAs1ZWQDgzvgA/O8FDPKWfN773GNs5xexJBWmmDcrMWIL6 nhA9a5OhYmcZtXqQoKodZEp5jhMY7ck++PAE+6JX0vNZyjBZrUGr5BbqVBaaeWI49oouyK cKHUfDWhXC++QmyZeOfYpSAtcDA+dqPTQuT56KkV7istkRc79R2Iz3GVAyWVxQ== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1783602911; 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: in-reply-to:in-reply-to:references:references; bh=2eWXoJbsmPACrUiEI6Qes7YghoFFmPaabwm8a5YUjvg=; b=50jcczpJIGp28/Y+rrdo2bcKZ4fBBALge0z10UabFspXx1idCA3exxs+6JwKQ4tQ1HdLry TRfTEYvVRqMHTRDQ== From: Sebastian Andrzej Siewior To: "David Hildenbrand (Arm)" Cc: Wandun Chen , vbabka@kernel.org, rostedt@goodmis.org, mhiramat@kernel.org, Alexander.Krabler@kuka.com, hughd@google.com, fvdl@google.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linux-rt-devel@lists.linux.dev, akpm@linux-foundation.org, surenb@google.com, mhocko@suse.com, jackmanb@google.com, hannes@cmpxchg.org, ziy@nvidia.com, ljs@kernel.org, riel@surriel.com, liam@infradead.org, harry@kernel.org, jannh@google.com, lance.yang@linux.dev, mathieu.desnoyers@efficios.com, matthew.brost@intel.com, joshua.hahnjy@gmail.com, rakie.kim@sk.com, byungchul@sk.com, gourry@gourry.net, ying.huang@linux.alibaba.com, apopple@nvidia.com, pfalcato@suse.de Subject: Re: [PATCH v2 4/4] mm/mlock: migrate folios out of CMA when mlocking a range Message-ID: <20260709131509.iIPP2VBh@linutronix.de> References: <20260707125925.3725177-1-chenwandun1@gmail.com> <20260707125925.3725177-5-chenwandun1@gmail.com> <9b227263-56d9-41d5-ba8e-c969d8d68785@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <9b227263-56d9-41d5-ba8e-c969d8d68785@kernel.org> X-Rspam-User: X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: D049B40007 X-Stat-Signature: kjcmxfn8idcx7cotssbb177nfwrewwt1 X-HE-Tag: 1783602913-895419 X-HE-Meta: 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 F4KXhEce nEFJnGaG2rMXwLtmZf8qzApz0cMf/NHgjvUGoVH2TdBvk3mUWjElSOR84TksgC1UoDVoaISOdRPuEzThvuqRRFFiWKnjug5vXa2Q+jZpdJ3Bw/wU/DRjEFFQBJTz/kdYcCPRgWrIgUMMVLJPBvRrDhza49I6XEZ6tRzv8meBtEck/RCQeMp5ularXB9RFymq/tTDwmWEzqiNcgec6hOUM25E4UD5n/x5d7TcawyCxd9g3zEFL/1CeAj0XhLv8APIHN+nM8neeHb6C6JpFfevToN4g3sJKAvdHcqrv2diLho7/v7tNAK+dMZti1bONGz6Q2wLGcb8f/w2BOKg= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 2026-07-09 12:04:33 [+0200], David Hildenbrand (Arm) wrote: > On 7/7/26 14:59, Wandun Chen wrote: > > From: Wandun Chen > > > > The region covered by mlock[all] may contain CMA pages. cma_alloc installs > > What about ZONE_MOVABLE where memory is supposed to be migratable? Would it be bad if the pages would not be movable anymore? Does this effect just memory-hotplug or something else, too? > Also, what about drivers that mmap() CMA memory to user space, and > __mm_populate()->populate_vma_page_range() would actually try mlocking them, and > they actually must remain on CMA areas? It should be safe to skip those. They belong to device and they shouldn't be affected by anything including getting swapped out. Sebastian