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[173.79.60.52]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-90e9ef0ef6csm27578886d6.44.2026.09.02.14.58.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 02 Sep 2026 14:58:56 -0700 (PDT) From: Gregory Price To: linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org, kernel-team@meta.com, akpm@linux-foundation.org, david@kernel.org, ljs@kernel.org, liam@infradead.org, vbabka@kernel.org, rppt@kernel.org, surenb@google.com, mhocko@suse.com, brendan.jackman@linux.dev, hannes@cmpxchg.org, ziy@nvidia.com Subject: [PATCH 1/2] mm: refactor find_next_best_node to find_next_best_node_in Date: Wed, 2 Sep 2026 17:58:52 -0400 Message-ID: <20260902215853.156267-2-gourry@gourry.net> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260902215853.156267-1-gourry@gourry.net> References: <20260902215853.156267-1-gourry@gourry.net> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" find_next_best_node() picks the next-closest node for a fallback list from the full N_MEMORY set. Refactor it into find_next_best_node_in(), which takes an explicit candidates nodemask. This enables building fallback lists with non-N_MEMORY candidates. No functional change: every caller still selects from N_MEMORY. Signed-off-by: Gregory Price Acked-by: Balbir Singh Reviewed-by: Vlastimil Babka (SUSE) --- mm/internal.h | 6 ++++-- mm/memory-tiers.c | 7 ++++--- mm/page_alloc.c | 13 ++++++++----- 3 files changed, 16 insertions(+), 10 deletions(-) diff --git a/mm/internal.h b/mm/internal.h index e16f1250b25c8..18d041ff5c52c 100644 --- a/mm/internal.h +++ b/mm/internal.h @@ -1130,7 +1130,8 @@ extern int node_reclaim_mode; =20 extern unsigned long node_reclaim(struct pglist_data *pgdat, gfp_t gfp_mask, unsigned int order); -extern int find_next_best_node(int node, nodemask_t *used_node_mask); +extern int find_next_best_node_in(int node, nodemask_t *used_node_mask, + const nodemask_t *candidates); #else #define node_reclaim_mode 0 =20 @@ -1139,7 +1140,8 @@ static inline unsigned long node_reclaim(struct pglis= t_data *pgdat, { return 0; } -static inline int find_next_best_node(int node, nodemask_t *used_node_mask) +static inline int find_next_best_node_in(int node, nodemask_t *used_node_m= ask, + const nodemask_t *candidates) { return NUMA_NO_NODE; } diff --git a/mm/memory-tiers.c b/mm/memory-tiers.c index 54851d8a195b0..25e121851b586 100644 --- a/mm/memory-tiers.c +++ b/mm/memory-tiers.c @@ -370,7 +370,7 @@ int next_demotion_node(int node, const nodemask_t *allo= wed_mask) * closest demotion target. */ nodes_complement(mask, *allowed_mask); - return find_next_best_node(node, &mask); + return find_next_best_node_in(node, &mask, &node_states[N_MEMORY]); } =20 static void disable_all_demotion_targets(void) @@ -450,7 +450,7 @@ static void establish_demotion_targets(void) memtier =3D list_next_entry(memtier, list); tier_nodes =3D get_memtier_nodemask(memtier); /* - * find_next_best_node, use 'used' nodemask as a skip list. + * find_next_best_node_in, use 'used' nodemask as a skip list. * Add all memory nodes except the selected memory tier * nodelist to skip list so that we find the best node from the * memtier nodelist. @@ -463,7 +463,8 @@ static void establish_demotion_targets(void) * in the preferred mask when allocating pages during demotion. */ do { - target =3D find_next_best_node(node, &tier_nodes); + target =3D find_next_best_node_in(node, &tier_nodes, + &node_states[N_MEMORY]); if (target =3D=3D NUMA_NO_NODE) break; =20 diff --git a/mm/page_alloc.c b/mm/page_alloc.c index c4dc61ec663ee..4dde1cbe2fd43 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -5779,9 +5779,10 @@ static int numa_zonelist_order_handler(const struct = ctl_table *table, int write, static int node_load[MAX_NUMNODES]; =20 /** - * find_next_best_node - find the next node that should appear in a given = node's fallback list + * find_next_best_node_in - find the next node that should appear in a giv= en node's fallback list * @node: node whose fallback list we're appending * @used_node_mask: nodemask_t of already used nodes + * @candidates: nodemask_t of nodes eligible for selection * * We use a number of factors to determine which is the next node that sho= uld * appear on a given node's fallback list. The node should not have appea= red @@ -5793,7 +5794,8 @@ static int node_load[MAX_NUMNODES]; * * Return: node id of the found node or %NUMA_NO_NODE if no node is found. */ -int find_next_best_node(int node, nodemask_t *used_node_mask) +int find_next_best_node_in(int node, nodemask_t *used_node_mask, + const nodemask_t *candidates) { int n, val; int min_val =3D INT_MAX; @@ -5803,12 +5805,12 @@ int find_next_best_node(int node, nodemask_t *used_= node_mask) * Use the local node if we haven't already, but for memoryless local * node, we should skip it and fall back to other nodes. */ - if (!node_isset(node, *used_node_mask) && node_state(node, N_MEMORY)) { + if (!node_isset(node, *used_node_mask) && node_isset(node, *candidates)) { node_set(node, *used_node_mask); return node; } =20 - for_each_node_state(n, N_MEMORY) { + for_each_node_mask(n, *candidates) { =20 /* Don't want a node to appear more than once */ if (node_isset(n, *used_node_mask)) @@ -5893,7 +5895,8 @@ static void build_zonelists(pg_data_t *pgdat) prev_node =3D local_node; 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[173.79.60.52]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-90e9ef0ef6csm27578886d6.44.2026.09.02.14.58.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 02 Sep 2026 14:58:58 -0700 (PDT) From: Gregory Price To: linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org, kernel-team@meta.com, akpm@linux-foundation.org, david@kernel.org, ljs@kernel.org, liam@infradead.org, vbabka@kernel.org, rppt@kernel.org, surenb@google.com, mhocko@suse.com, brendan.jackman@linux.dev, hannes@cmpxchg.org, ziy@nvidia.com Subject: [PATCH 2/2] mm/page_alloc: refactor build_node_zonelist() out of build_zonelists() Date: Wed, 2 Sep 2026 17:58:53 -0400 Message-ID: <20260902215853.156267-3-gourry@gourry.net> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260902215853.156267-1-gourry@gourry.net> References: <20260902215853.156267-1-gourry@gourry.net> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Extract per-node fallback-list construction into build_node_zonelist(). This lets us build new zonelists from candidate nodemasks instead of just the default N_MEMORY node state list. No functional change: build_zonelists() builds the same FALLBACK list over N_MEMORY with node_load updates as before. Signed-off-by: Gregory Price --- mm/page_alloc.c | 44 ++++++++++++++++++++++++++++++-------------- 1 file changed, 30 insertions(+), 14 deletions(-) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 4dde1cbe2fd43..e1d7c8b221d0d 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -5849,12 +5849,12 @@ int find_next_best_node_in(int node, nodemask_t *us= ed_node_mask, * DMA zone, if any--but risks exhausting DMA zone. */ static void build_zonelists_in_node_order(pg_data_t *pgdat, int *node_orde= r, - unsigned nr_nodes) + unsigned int nr_nodes, int zlidx) { struct zoneref *zonerefs; int i; =20 - zonerefs =3D pgdat->node_zonelists[ZONELIST_FALLBACK]._zonerefs; + zonerefs =3D pgdat->node_zonelists[zlidx]._zonerefs; =20 for (i =3D 0; i < nr_nodes; i++) { int nr_zones; @@ -5883,26 +5883,28 @@ static void build_thisnode_zonelists(pg_data_t *pgd= at) zonerefs->zone_idx =3D 0; } =20 -static void build_zonelists(pg_data_t *pgdat) +/* + * Build one node-ordered fallback list from a candidate nodemask. + * update_load round-robins node_load across equidistant nodes. + */ +static void build_node_zonelist(pg_data_t *pgdat, const nodemask_t *candid= ates, + int zlidx, bool update_load, + int *node_order, int *nr) { - static int node_order[MAX_NUMNODES]; - int node, nr_nodes =3D 0; nodemask_t used_mask =3D NODE_MASK_NONE; - int local_node, prev_node; - - /* NUMA-aware ordering of nodes */ - local_node =3D pgdat->node_id; - prev_node =3D local_node; + int local_node =3D pgdat->node_id; + int prev_node =3D local_node; + int node, nr_nodes =3D 0; =20 - memset(node_order, 0, sizeof(node_order)); while ((node =3D find_next_best_node_in(local_node, &used_mask, - &node_states[N_MEMORY])) >=3D 0) { + candidates)) >=3D 0) { /* * We don't want to pressure a particular node. * So adding penalty to the first node in same * distance group to make it round-robin. */ - if (node_distance(local_node, node) !=3D + if (update_load && + node_distance(local_node, node) !=3D node_distance(local_node, prev_node)) node_load[node] +=3D 1; =20 @@ -5910,8 +5912,22 @@ static void build_zonelists(pg_data_t *pgdat) prev_node =3D node; } =20 - build_zonelists_in_node_order(pgdat, node_order, nr_nodes); + build_zonelists_in_node_order(pgdat, node_order, nr_nodes, zlidx); + *nr =3D nr_nodes; +} + +static void build_zonelists(pg_data_t *pgdat) +{ + static int node_order[MAX_NUMNODES]; + int local_node =3D pgdat->node_id; + int node, nr_nodes =3D 0; + + memset(node_order, 0, sizeof(node_order)); + + build_node_zonelist(pgdat, &node_states[N_MEMORY], ZONELIST_FALLBACK, + true, node_order, &nr_nodes); build_thisnode_zonelists(pgdat); + pr_info("Fallback order for Node %d: ", local_node); for (node =3D 0; node < nr_nodes; node++) pr_cont("%d ", node_order[node]); --=20 2.53.0-Meta