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Peter Anvin" , Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman Subject: [PATCHv2 1/3] mm/numa: change the topo of build_zonelist_xx() Date: Thu, 20 Dec 2018 17:50:37 +0800 Message-Id: <1545299439-31370-2-git-send-email-kernelfans@gmail.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1545299439-31370-1-git-send-email-kernelfans@gmail.com> References: <1545299439-31370-1-git-send-email-kernelfans@gmail.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The current build_zonelist_xx func relies on pgdat instance to build zonelist, if a numa node is offline, there will no pgdat instance for it. But in some case, there is still requirement for zonelist of offline node, especially with nr_cpus option. This patch change these funcs topo to ease the building of zonelist for offline nodes. Signed-off-by: Pingfan Liu Cc: linuxppc-dev@lists.ozlabs.org Cc: x86@kernel.org Cc: linux-kernel@vger.kernel.org Cc: Andrew Morton Cc: Michal Hocko Cc: Vlastimil Babka Cc: Mike Rapoport Cc: Bjorn Helgaas Cc: Jonathan Cameron Cc: David Rientjes Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Borislav Petkov Cc: "H. Peter Anvin" Cc: Benjamin Herrenschmidt Cc: Paul Mackerras Cc: Michael Ellerman --- mm/page_alloc.c | 44 +++++++++++++++++++++----------------------- 1 file changed, 21 insertions(+), 23 deletions(-) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 2ec9cc4..17dbf6e 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -5049,7 +5049,7 @@ static void zoneref_set_zone(struct zone *zone, struct zoneref *zoneref) * * Add all populated zones of a node to the zonelist. */ -static int build_zonerefs_node(pg_data_t *pgdat, struct zoneref *zonerefs) +static int build_zonerefs_node(int nid, struct zoneref *zonerefs) { struct zone *zone; enum zone_type zone_type = MAX_NR_ZONES; @@ -5057,7 +5057,7 @@ static int build_zonerefs_node(pg_data_t *pgdat, struct zoneref *zonerefs) do { zone_type--; - zone = pgdat->node_zones + zone_type; + zone = NODE_DATA(nid)->node_zones + zone_type; if (managed_zone(zone)) { zoneref_set_zone(zone, &zonerefs[nr_zones++]); check_highest_zone(zone_type); @@ -5186,20 +5186,20 @@ static int find_next_best_node(int node, nodemask_t *used_node_mask) * This results in maximum locality--normal zone overflows into local * DMA zone, if any--but risks exhausting DMA zone. */ -static void build_zonelists_in_node_order(pg_data_t *pgdat, int *node_order, - unsigned nr_nodes) +static void build_zonelists_in_node_order(struct zonelist *node_zonelists, + int *node_order, unsigned int nr_nodes) { struct zoneref *zonerefs; int i; - zonerefs = pgdat->node_zonelists[ZONELIST_FALLBACK]._zonerefs; + zonerefs = node_zonelists[ZONELIST_FALLBACK]._zonerefs; for (i = 0; i < nr_nodes; i++) { int nr_zones; pg_data_t *node = NODE_DATA(node_order[i]); - nr_zones = build_zonerefs_node(node, zonerefs); + nr_zones = build_zonerefs_node(node->node_id, zonerefs); zonerefs += nr_zones; } zonerefs->zone = NULL; @@ -5209,13 +5209,14 @@ static void build_zonelists_in_node_order(pg_data_t *pgdat, int *node_order, /* * Build gfp_thisnode zonelists */ -static void build_thisnode_zonelists(pg_data_t *pgdat) +static void build_thisnode_zonelists(struct zonelist *node_zonelists, + int nid) { struct zoneref *zonerefs; int nr_zones; - zonerefs = pgdat->node_zonelists[ZONELIST_NOFALLBACK]._zonerefs; - nr_zones = build_zonerefs_node(pgdat, zonerefs); + zonerefs = node_zonelists[ZONELIST_NOFALLBACK]._zonerefs; + nr_zones = build_zonerefs_node(nid, zonerefs); zonerefs += nr_zones; zonerefs->zone = NULL; zonerefs->zone_idx = 0; @@ -5228,15 +5229,14 @@ static void build_thisnode_zonelists(pg_data_t *pgdat) * may still exist in local DMA zone. */ -static void build_zonelists(pg_data_t *pgdat) +static void build_zonelists(struct zonelist *node_zonelists, int local_node) { static int node_order[MAX_NUMNODES]; int node, load, nr_nodes = 0; nodemask_t used_mask; - int local_node, prev_node; + int prev_node; /* NUMA-aware ordering of nodes */ - local_node = pgdat->node_id; load = nr_online_nodes; prev_node = local_node; nodes_clear(used_mask); @@ -5257,8 +5257,8 @@ static void build_zonelists(pg_data_t *pgdat) load--; } - build_zonelists_in_node_order(pgdat, node_order, nr_nodes); - build_thisnode_zonelists(pgdat); + build_zonelists_in_node_order(node_zonelists, node_order, nr_nodes); + build_thisnode_zonelists(node_zonelists, local_node); } #ifdef CONFIG_HAVE_MEMORYLESS_NODES @@ -5283,16 +5283,14 @@ static void setup_min_unmapped_ratio(void); static void setup_min_slab_ratio(void); #else /* CONFIG_NUMA */ -static void build_zonelists(pg_data_t *pgdat) +static void build_zonelists(struct zonelist *node_zonelists, int local_node) { int node, local_node; struct zoneref *zonerefs; int nr_zones; - local_node = pgdat->node_id; - - zonerefs = pgdat->node_zonelists[ZONELIST_FALLBACK]._zonerefs; - nr_zones = build_zonerefs_node(pgdat, zonerefs); + zonerefs = node_zonelists[ZONELIST_FALLBACK]._zonerefs; + nr_zones = build_zonerefs_node(local_node, zonerefs); zonerefs += nr_zones; /* @@ -5306,13 +5304,13 @@ static void build_zonelists(pg_data_t *pgdat) for (node = local_node + 1; node < MAX_NUMNODES; node++) { if (!node_online(node)) continue; - nr_zones = build_zonerefs_node(NODE_DATA(node), zonerefs); + nr_zones = build_zonerefs_node(node, zonerefs); zonerefs += nr_zones; } for (node = 0; node < local_node; node++) { if (!node_online(node)) continue; - nr_zones = build_zonerefs_node(NODE_DATA(node), zonerefs); + nr_zones = build_zonerefs_node(node, zonerefs); zonerefs += nr_zones; } @@ -5359,12 +5357,12 @@ static void __build_all_zonelists(void *data) * building zonelists is fine - no need to touch other nodes. */ if (self && !node_online(self->node_id)) { - build_zonelists(self); + build_zonelists(self->node_zonelists, self->node_id); } else { for_each_online_node(nid) { pg_data_t *pgdat = NODE_DATA(nid); - build_zonelists(pgdat); + build_zonelists(pgdat->node_zonelists, pgdat->node_id); } #ifdef CONFIG_HAVE_MEMORYLESS_NODES -- 2.7.4