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 From dann frazier <> Subject [PATCH 4.19 1/3] sched/topology: Make sched_init_numa() use a set for the deduplicating sort Date Mon, 7 Mar 2022 12:59:39 -0700
`From: Valentin Schneider <valentin.schneider@arm.com>commit 620a6dc40754dc218f5b6389b5d335e9a107fd29 upstream.The deduplicating sort in sched_init_numa() assumes that the first line inthe distance table contains all unique values in the entire table. I'vebeen trying to pen what this exactly means for the topology, but it's notstraightforward. For instance, topology.c uses this example:  node   0   1   2   3    0:  10  20  20  30    1:  20  10  20  20    2:  20  20  10  20    3:  30  20  20  10  0 ----- 1  |     / |  |   /   |  | /     |  2 ----- 3Which works out just fine. However, if we swap nodes 0 and 1:  1 ----- 0  |     / |  |   /   |  | /     |  2 ----- 3we get this distance table:  node   0  1  2  3    0:  10 20 20 20    1:  20 10 20 30    2:  20 20 10 20    3:  20 30 20 10Which breaks the deduplicating sort (non-representative first line). Inthis case this would just be a renumbering exercise, but it so happens thatwe can have a deduplicating sort that goes through the whole table in O(n²)at the extra cost of a temporary memory allocation (i.e. any form of set).The ACPI spec (SLIT) mentions distances are encoded on 8 bits. Followingthis, implement the set as a 256-bits bitmap. Should this not besatisfactory (i.e. we want to support 32-bit values), then we'll have to gofor some other sparse set implementation.This has the added benefit of letting us allocate just the right amount ofmemory for sched_domains_numa_distance[], rather than an arbitrary(nr_node_ids + 1).Note: DT binding equivalent (distance-map) decodes distances as 32-bitvalues.Signed-off-by: Valentin Schneider <valentin.schneider@arm.com>Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>Link: https://lkml.kernel.org/r/20210122123943.1217-2-valentin.schneider@arm.comSigned-off-by: dann frazier <dann.frazier@canonical.com>--- include/linux/topology.h |  1 + kernel/sched/topology.c  | 99 +++++++++++++++++++--------------------- 2 files changed, 49 insertions(+), 51 deletions(-)diff --git a/include/linux/topology.h b/include/linux/topology.hindex cb0775e1ee4b..707364c90aa6 100644--- a/include/linux/topology.h+++ b/include/linux/topology.h@@ -47,6 +47,7 @@ int arch_update_cpu_topology(void); /* Conform to ACPI 2.0 SLIT distance definitions */ #define LOCAL_DISTANCE		10 #define REMOTE_DISTANCE		20+#define DISTANCE_BITS           8 #ifndef node_distance #define node_distance(from,to)	((from) == (to) ? LOCAL_DISTANCE : REMOTE_DISTANCE) #endifdiff --git a/kernel/sched/topology.c b/kernel/sched/topology.cindex f58efa5cc647..0826f3f4920a 100644--- a/kernel/sched/topology.c+++ b/kernel/sched/topology.c@@ -1322,66 +1322,58 @@ static void init_numa_topology_type(void) 	} } ++#define NR_DISTANCE_VALUES (1 << DISTANCE_BITS)+ void sched_init_numa(void) {-	int next_distance, curr_distance = node_distance(0, 0); 	struct sched_domain_topology_level *tl;-	int level = 0;-	int i, j, k;--	sched_domains_numa_distance = kzalloc(sizeof(int) * (nr_node_ids + 1), GFP_KERNEL);-	if (!sched_domains_numa_distance)-		return;--	/* Includes NUMA identity node at level 0. */-	sched_domains_numa_distance[level++] = curr_distance;-	sched_domains_numa_levels = level;+	unsigned long *distance_map;+	int nr_levels = 0;+	int i, j;  	/* 	 * O(nr_nodes^2) deduplicating selection sort -- in order to find the 	 * unique distances in the node_distance() table.-	 *-	 * Assumes node_distance(0,j) includes all distances in-	 * node_distance(i,j) in order to avoid cubic time. 	 */-	next_distance = curr_distance;+	distance_map = bitmap_alloc(NR_DISTANCE_VALUES, GFP_KERNEL);+	if (!distance_map)+		return;++	bitmap_zero(distance_map, NR_DISTANCE_VALUES); 	for (i = 0; i < nr_node_ids; i++) { 		for (j = 0; j < nr_node_ids; j++) {-			for (k = 0; k < nr_node_ids; k++) {-				int distance = node_distance(i, k);--				if (distance > curr_distance &&-				    (distance < next_distance ||-				     next_distance == curr_distance))-					next_distance = distance;--				/*-				 * While not a strong assumption it would be nice to know-				 * about cases where if node A is connected to B, B is not-				 * equally connected to A.-				 */-				if (sched_debug() && node_distance(k, i) != distance)-					sched_numa_warn("Node-distance not symmetric");+			int distance = node_distance(i, j); -				if (sched_debug() && i && !find_numa_distance(distance))-					sched_numa_warn("Node-0 not representative");+			if (distance < LOCAL_DISTANCE || distance >= NR_DISTANCE_VALUES) {+				sched_numa_warn("Invalid distance value range");+				return; 			}-			if (next_distance != curr_distance) {-				sched_domains_numa_distance[level++] = next_distance;-				sched_domains_numa_levels = level;-				curr_distance = next_distance;-			} else break;++			bitmap_set(distance_map, distance, 1); 		}+	}+	/*+	 * We can now figure out how many unique distance values there are and+	 * allocate memory accordingly.+	 */+	nr_levels = bitmap_weight(distance_map, NR_DISTANCE_VALUES); -		/*-		 * In case of sched_debug() we verify the above assumption.-		 */-		if (!sched_debug())-			break;+	sched_domains_numa_distance = kcalloc(nr_levels, sizeof(int), GFP_KERNEL);+	if (!sched_domains_numa_distance) {+		bitmap_free(distance_map);+		return; 	} +	for (i = 0, j = 0; i < nr_levels; i++, j++) {+		j = find_next_bit(distance_map, NR_DISTANCE_VALUES, j);+		sched_domains_numa_distance[i] = j;+	}++	bitmap_free(distance_map);+ 	/*-	 * 'level' contains the number of unique distances+	 * 'nr_levels' contains the number of unique distances 	 * 	 * The sched_domains_numa_distance[] array includes the actual distance 	 * numbers.@@ -1390,15 +1382,15 @@ void sched_init_numa(void) 	/* 	 * Here, we should temporarily reset sched_domains_numa_levels to 0. 	 * If it fails to allocate memory for array sched_domains_numa_masks[][],-	 * the array will contain less then 'level' members. This could be+	 * the array will contain less then 'nr_levels' members. This could be 	 * dangerous when we use it to iterate array sched_domains_numa_masks[][] 	 * in other functions. 	 *-	 * We reset it to 'level' at the end of this function.+	 * We reset it to 'nr_levels' at the end of this function. 	 */ 	sched_domains_numa_levels = 0; -	sched_domains_numa_masks = kzalloc(sizeof(void *) * level, GFP_KERNEL);+	sched_domains_numa_masks = kzalloc(sizeof(void *) * nr_levels, GFP_KERNEL); 	if (!sched_domains_numa_masks) 		return; @@ -1406,7 +1398,7 @@ void sched_init_numa(void) 	 * Now for each level, construct a mask per node which contains all 	 * CPUs of nodes that are that many hops away from us. 	 */-	for (i = 0; i < level; i++) {+	for (i = 0; i < nr_levels; i++) { 		sched_domains_numa_masks[i] = 			kzalloc(nr_node_ids * sizeof(void *), GFP_KERNEL); 		if (!sched_domains_numa_masks[i])@@ -1414,12 +1406,17 @@ void sched_init_numa(void)  		for (j = 0; j < nr_node_ids; j++) { 			struct cpumask *mask = kzalloc(cpumask_size(), GFP_KERNEL);+			int k;+ 			if (!mask) 				return;  			sched_domains_numa_masks[i][j] = mask;  			for_each_node(k) {+				if (sched_debug() && (node_distance(j, k) != node_distance(k, j)))+					sched_numa_warn("Node-distance not symmetric");+ 				if (node_distance(j, k) > sched_domains_numa_distance[i]) 					continue; @@ -1431,7 +1428,7 @@ void sched_init_numa(void) 	/* Compute default topology size */ 	for (i = 0; sched_domain_topology[i].mask; i++); -	tl = kzalloc((i + level + 1) *+	tl = kzalloc((i + nr_levels) * 			sizeof(struct sched_domain_topology_level), GFP_KERNEL); 	if (!tl) 		return;@@ -1454,7 +1451,7 @@ void sched_init_numa(void) 	/* 	 * .. and append 'j' levels of NUMA goodness. 	 */-	for (j = 1; j < level; i++, j++) {+	for (j = 1; j < nr_levels; i++, j++) { 		tl[i] = (struct sched_domain_topology_level){ 			.mask = sd_numa_mask, 			.sd_flags = cpu_numa_flags,@@ -1466,8 +1463,8 @@ void sched_init_numa(void)  	sched_domain_topology = tl; -	sched_domains_numa_levels = level;-	sched_max_numa_distance = sched_domains_numa_distance[level - 1];+	sched_domains_numa_levels = nr_levels;+	sched_max_numa_distance = sched_domains_numa_distance[nr_levels - 1];  	init_numa_topology_type(); }-- 2.25.1`

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