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[173.79.60.52]) by smtp.gmail.com with ESMTPSA id af79cd13be357-93c29e070dbsm392841285a.14.2026.09.24.08.37.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 24 Sep 2026 08:37:29 -0700 (PDT) Date: Thu, 24 Sep 2026 11:37:26 -0400 From: Gregory Price To: "David Hildenbrand (Arm)" Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, kernel-team@meta.com, akpm@linux-foundation.org, ljs@kernel.org, liam@infradead.org, vbabka@kernel.org, rppt@kernel.org, surenb@google.com, mhocko@suse.com, mingo@redhat.com, peterz@infradead.org, juri.lelli@redhat.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de, vschneid@redhat.com, kprateek.nayak@amd.com, ziy@nvidia.com, baolin.wang@linux.alibaba.com, nico.pache@linux.dev, ryan.roberts@arm.com, dev.jain@arm.com, baohua@kernel.org, lance.yang@linux.dev, usama.arif@linux.dev, kas@kernel.org, matthew.brost@intel.com, joshua.hahnjy@gmail.com, rakie.kim@sk.com, byungchul@sk.com, ying.huang@linux.alibaba.com, apopple@nvidia.com, jannh@google.com, pfalcato@suse.de, hannes@cmpxchg.org, shy828301@gmail.com, raghavendra.kt@amd.com, stable@vger.kernel.org Subject: Re: [PATCH v3 2/7] mm: allow shared folios to be promoted to a fast tier Message-ID: References: <20260922182928.2199090-1-gourry@gourry.net> <20260922182928.2199090-3-gourry@gourry.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: ECA54140008 X-Stat-Signature: eyjpcfgnzmcqh9wedyddrt73rj4ywfby X-Rspam-User: X-HE-Tag: 1790264250-362986 X-HE-Meta: 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 NKteEPDy hlTls2Hjw6BtapVYcjAknQXxl/c5+mQVh3yXvRbXBSCn0lh6XNa3ESbEzoLqVRTR4ka8OGrZ7bYTvYQnqmBcGZSLgcHvZ3Hk13XP12DwEZB0HzANe9o1mpA9GBKwQo7Y5NuqG0KB1P9thpJEX1yVicAnlCUaYw5R1617Se2L4clX3pJhHqdHgaD+EqDWTpxOoFSJn6heBWR36NSjeBUD4uQCrtdTcx23/Mft/f6+TdpwiM/KzNSgsu0Rl15UjPLCLT+5YuHH/Jycy6SMd0YF6VnVJ/5pite6FcwUWLVeo27qya5cWFThQgMOCKXM9xL6VdxiyQ1/wUookTdXVOx39vS47LPCy2jKzp71rxOu1u9MJ0al+Gg3t9x0oyefexLzC4wCXklgw86AA95CRvFY7Nu4A8w== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu, Sep 24, 2026 at 05:32:22PM +0200, David Hildenbrand (Arm) wrote: > On 9/24/26 16:07, Gregory Price wrote: > > On Thu, Sep 24, 2026 at 01:59:15PM +0200, David Hildenbrand (Arm) wrote: > >> I wonder if a better name would just make the comment above (about memory > >> tiering) implicit and make more sense of the sysctl_numa_balancing_mode & > >> NUMA_BALANCING_MEMORY_TIERING) check. > >> > >> folio_promotable() > >> > >> folio_is_promotable() > >> > >> folio_numa_promotable() > >> > >> etc. > >> > >> because that seems to be what we really test with both things combined. > >> > > > > maybe: folio_numab_promotable() ? > > Works for me if "numab" means numa balancing :) > Sounds good, i'll let this rest for a bit before spinning a v4. I think the rest is pretty solid, but there's one other sashiko thing i need to think about whether it's real or not. ~Gregory