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b=PGRtm0Kkzl+sKjrxr1XFkfDzoOEMVo0po4REuofgBxyqG6m9Yn7gG+Kg7vWpD/CO9 2oaoF5sD9YDzmji/GtJ+cooHjmCGdJe3OlLXNv1EngzRwBU9ZBnpiLFUbe4J4bj2Xw hCtH8c6u6OurSxUGxv0uDvA3ukcqlyQ0K2aQqder7zp9tXGiuewcFGg//jJ5WSZhsm iEL7NAUTLcS9WwqRqE6D+J0Yg+besdF3da9KIHlF4iptObFmoxr7TF1Koof+TtB7Gy 6nmyr17Ird0129PyX6rR/AfOGdiksDlQqmvgDXRa4tVvsc/QjYoaVDCBQXmzgA8oOZ r+Cnngf54P4KQ== Message-ID: Date: Thu, 12 Mar 2026 13:56:21 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/4] mm: Move demotion related functions in memory-tiers.c To: Alexandre Ghiti , akpm@linux-foundation.org Cc: alexghiti@kernel.org, kernel-team@meta.com, akinobu.mita@gmail.com, lorenzo.stoakes@oracle.com, Liam.Howlett@oracle.com, vbabka@kernel.org, rppt@kernel.org, surenb@google.com, mhocko@suse.com, hannes@cmpxchg.org, zhengqi.arch@bytedance.com, shakeel.butt@linux.dev, axelrasmussen@google.com, yuanchu@google.com, weixugc@google.com, gourry@gourry.net, apopple@nvidia.com, byungchul@sk.com, joshua.hahnjy@gmail.com, matthew.brost@intel.com, rakie.kim@sk.com, ying.huang@linux.alibaba.com, ziy@nvidia.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <20260311110314.237315-1-alex@ghiti.fr> <20260311110314.237315-2-alex@ghiti.fr> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 40AF280009 X-Stat-Signature: 1wtcht6yuhdfx5ai735umsbxc4jcs9ym X-Rspam-User: X-HE-Tag: 1773320189-931555 X-HE-Meta: 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 QPKeXewl Sq30qka3ZbFgAp+VTxvSlM1dU9afRZL77boLWyJQR7gdmwZh+LzWcbaGlpJ6DlsNp/LGldFwnBUwo/lgf46+RONsjtrmipGDLdqtiGrUEpZkOKbr37H7HA5+qsVR9VmJxCQYlVXCTCUjijpDxadoU3T9I/GxFdyN9G01ualohp6mNdG93agN6rgpBhvZiuRAvORrt9eVKSk8iWzqWONGmclqTj6e9WMa0LeBliDeCw0LKK3ZbgoQFzg0rkC9hzVj/QCSnxwGfH7IfeihGZWGAWvnHhCFBkRLHG+6leajsa+9NwAvZsa265cNj8SUDzQJprY2xXNRKM+QugGDqqgv3f8tXIs5iVxBpr1oUy06mA/GBK27XhEsyT59bYlk2HfLRGVD4xsf+MPH5TpUBN7YqQ1Xhd/rikiD0yAwspwsh6pziTjA= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 3/11/26 12:02, Alexandre Ghiti wrote: > Let's have all the demotion functions in this file, no functional > change intended. > > Suggested-by: Gregory Price > Signed-off-by: Alexandre Ghiti > --- > include/linux/memory-tiers.h | 18 ++++++++ > mm/memory-tiers.c | 75 +++++++++++++++++++++++++++++++++ > mm/vmscan.c | 80 +----------------------------------- > 3 files changed, 94 insertions(+), 79 deletions(-) > > diff --git a/include/linux/memory-tiers.h b/include/linux/memory-tiers.h > index 96987d9d95a8..0bf0d002939e 100644 > --- a/include/linux/memory-tiers.h > +++ b/include/linux/memory-tiers.h > @@ -56,6 +56,9 @@ void mt_put_memory_types(struct list_head *memory_types); > int next_demotion_node(int node, const nodemask_t *allowed_mask); > void node_get_allowed_targets(pg_data_t *pgdat, nodemask_t *targets); > bool node_is_toptier(int node); > +unsigned int mt_demote_folios(struct list_head *demote_folios, > + struct pglist_data *pgdat, > + struct mem_cgroup *memcg); > #else > static inline int next_demotion_node(int node, const nodemask_t *allowed_mask) > { > @@ -71,6 +74,14 @@ static inline bool node_is_toptier(int node) > { > return true; > } > + > +static inline unsigned int mt_demote_folios(struct list_head *demote_folios, > + struct pglist_data *pgdat, > + struct mem_cgroup *memcg) use two-tab indentation on second parameter line please. So this fits into a single line. Same for the other functions. Just like alloc_demote_folio() that you are moving already did. [...] > -static struct folio *alloc_demote_folio(struct folio *src, > - unsigned long private) > -{ > - struct folio *dst; > - nodemask_t *allowed_mask; > - struct migration_target_control *mtc; > - > - mtc = (struct migration_target_control *)private; > - > - allowed_mask = mtc->nmask; > - /* > - * make sure we allocate from the target node first also trying to > - * demote or reclaim pages from the target node via kswapd if we are > - * low on free memory on target node. If we don't do this and if > - * we have free memory on the slower(lower) memtier, we would start > - * allocating pages from slower(lower) memory tiers without even forcing > - * a demotion of cold pages from the target memtier. This can result > - * in the kernel placing hot pages in slower(lower) memory tiers. > - */ > - mtc->nmask = NULL; > - mtc->gfp_mask |= __GFP_THISNODE; > - dst = alloc_migration_target(src, (unsigned long)mtc); > - if (dst) > - return dst; > - > - mtc->gfp_mask &= ~__GFP_THISNODE; > - mtc->nmask = allowed_mask; > - I think this function changed in the meantime in mm/mm-unstable. Against which branch is this patch? -- Cheers, David