btf: allow to customize dedup hash table size

Default size of dedup table (16k) is good enough for most binaries, even
typical vmlinux images. But there are cases of binaries with huge amount
of BTF types (e.g., allyesconfig variants of kernel), which benefit from
having bigger dedup table size to lower amount of unnecessary hash
collisions. Tools like pahole, thus, can tune this parameter to reach
optimal performance.

This change also serves double purpose of allowing tests to force hash
collisions to test some corner cases, used in follow up patch.
Signed-off-by: NAndrii Nakryiko <andriin@fb.com>
Acked-by: NYonghong Song <yhs@fb.com>
Signed-off-by: NDaniel Borkmann <daniel@iogearbox.net>

tools/lib/bpf/btf.c

@@ -1070,8 +1070,8 @@ int btf__dedup(struct btf *btf, struct btf_ext *btf_ext,
 	return err;
 }
 
-#define BTF_DEDUP_TABLE_SIZE_LOG 14
-#define BTF_DEDUP_TABLE_MOD ((1 << BTF_DEDUP_TABLE_SIZE_LOG) - 1)
+#define BTF_DEDUP_TABLE_DEFAULT_SIZE (1 << 14)
+#define BTF_DEDUP_TABLE_MAX_SIZE_LOG 31
 #define BTF_UNPROCESSED_ID ((__u32)-1)
 #define BTF_IN_PROGRESS_ID ((__u32)-2)
 
@@ -1128,18 +1128,21 @@ static inline __u32 hash_combine(__u32 h, __u32 value)
 #undef GOLDEN_RATIO_PRIME
 }
 
-#define for_each_hash_node(table, hash, node) \
-	for (node = table[hash & BTF_DEDUP_TABLE_MOD]; node; node = node->next)
+#define for_each_dedup_cand(d, hash, node) \
+	for (node = d->dedup_table[hash & (d->opts.dedup_table_size - 1)]; \
+	     node;							   \
+	     node = node->next)
 
 static int btf_dedup_table_add(struct btf_dedup *d, __u32 hash, __u32 type_id)
 {
 	struct btf_dedup_node *node = malloc(sizeof(struct btf_dedup_node));
+	int bucket = hash & (d->opts.dedup_table_size - 1);
 
 	if (!node)
 		return -ENOMEM;
 	node->type_id = type_id;
-	node->next = d->dedup_table[hash & BTF_DEDUP_TABLE_MOD];
-	d->dedup_table[hash & BTF_DEDUP_TABLE_MOD] = node;
+	node->next = d->dedup_table[bucket];
+	d->dedup_table[bucket] = node;
 	return 0;
 }
 
@@ -1177,7 +1180,7 @@ static void btf_dedup_table_free(struct btf_dedup *d)
 	if (!d->dedup_table)
 		return;
 
-	for (i = 0; i < (1 << BTF_DEDUP_TABLE_SIZE_LOG); i++) {
+	for (i = 0; i < d->opts.dedup_table_size; i++) {
 		while (d->dedup_table[i]) {
 			tmp = d->dedup_table[i];
 			d->dedup_table[i] = tmp->next;
@@ -1212,19 +1215,37 @@ static void btf_dedup_free(struct btf_dedup *d)
 	free(d);
 }
 
+/* Find closest power of two >= to size, capped at 2^max_size_log */
+static __u32 roundup_pow2_max(__u32 size, int max_size_log)
+{
+	int i;
+
+	for (i = 0; i < max_size_log  && (1U << i) < size;  i++)
+		;
+	return 1U << i;
+}
+
+
 static struct btf_dedup *btf_dedup_new(struct btf *btf, struct btf_ext *btf_ext,
 				       const struct btf_dedup_opts *opts)
 {
 	struct btf_dedup *d = calloc(1, sizeof(struct btf_dedup));
 	int i, err = 0;
+	__u32 sz;
 
 	if (!d)
 		return ERR_PTR(-ENOMEM);
 
+	d->opts.dont_resolve_fwds = opts && opts->dont_resolve_fwds;
+	sz = opts && opts->dedup_table_size ? opts->dedup_table_size
+					    : BTF_DEDUP_TABLE_DEFAULT_SIZE;
+	sz = roundup_pow2_max(sz, BTF_DEDUP_TABLE_MAX_SIZE_LOG);
+	d->opts.dedup_table_size = sz;
+
 	d->btf = btf;
 	d->btf_ext = btf_ext;
 
-	d->dedup_table = calloc(1 << BTF_DEDUP_TABLE_SIZE_LOG,
+	d->dedup_table = calloc(d->opts.dedup_table_size,
 				sizeof(struct btf_dedup_node *));
 	if (!d->dedup_table) {
 		err = -ENOMEM;
@@ -1249,8 +1270,6 @@ static struct btf_dedup *btf_dedup_new(struct btf *btf, struct btf_ext *btf_ext,
 	for (i = 0; i <= btf->nr_types; i++)
 		d->hypot_map[i] = BTF_UNPROCESSED_ID;
 
-	d->opts.dont_resolve_fwds = opts && opts->dont_resolve_fwds;
-
 done:
 	if (err) {
 		btf_dedup_free(d);
@@ -1824,7 +1843,7 @@ static int btf_dedup_prim_type(struct btf_dedup *d, __u32 type_id)
 
 	case BTF_KIND_INT:
 		h = btf_hash_int(t);
-		for_each_hash_node(d->dedup_table, h, cand_node) {
+		for_each_dedup_cand(d, h, cand_node) {
 			cand = d->btf->types[cand_node->type_id];
 			if (btf_equal_int(t, cand)) {
 				new_id = cand_node->type_id;
@@ -1835,7 +1854,7 @@ static int btf_dedup_prim_type(struct btf_dedup *d, __u32 type_id)
 
 	case BTF_KIND_ENUM:
 		h = btf_hash_enum(t);
-		for_each_hash_node(d->dedup_table, h, cand_node) {
+		for_each_dedup_cand(d, h, cand_node) {
 			cand = d->btf->types[cand_node->type_id];
 			if (btf_equal_enum(t, cand)) {
 				new_id = cand_node->type_id;
@@ -1846,7 +1865,7 @@ static int btf_dedup_prim_type(struct btf_dedup *d, __u32 type_id)
 
 	case BTF_KIND_FWD:
 		h = btf_hash_common(t);
-		for_each_hash_node(d->dedup_table, h, cand_node) {
+		for_each_dedup_cand(d, h, cand_node) {
 			cand = d->btf->types[cand_node->type_id];
 			if (btf_equal_common(t, cand)) {
 				new_id = cand_node->type_id;
@@ -2263,7 +2282,7 @@ static int btf_dedup_struct_type(struct btf_dedup *d, __u32 type_id)
 		return 0;
 
 	h = btf_hash_struct(t);
-	for_each_hash_node(d->dedup_table, h, cand_node) {
+	for_each_dedup_cand(d, h, cand_node) {
 		int eq;
 
 		btf_dedup_clear_hypot_map(d);
@@ -2350,7 +2369,7 @@ static int btf_dedup_ref_type(struct btf_dedup *d, __u32 type_id)
 		t->type = ref_type_id;
 
 		h = btf_hash_common(t);
-		for_each_hash_node(d->dedup_table, h, cand_node) {
+		for_each_dedup_cand(d, h, cand_node) {
 			cand = d->btf->types[cand_node->type_id];
 			if (btf_equal_common(t, cand)) {
 				new_id = cand_node->type_id;
@@ -2373,7 +2392,7 @@ static int btf_dedup_ref_type(struct btf_dedup *d, __u32 type_id)
 		info->index_type = ref_type_id;
 
 		h = btf_hash_array(t);
-		for_each_hash_node(d->dedup_table, h, cand_node) {
+		for_each_dedup_cand(d, h, cand_node) {
 			cand = d->btf->types[cand_node->type_id];
 			if (btf_equal_array(t, cand)) {
 				new_id = cand_node->type_id;
@@ -2404,7 +2423,7 @@ static int btf_dedup_ref_type(struct btf_dedup *d, __u32 type_id)
 		}
 
 		h = btf_hash_fnproto(t);
-		for_each_hash_node(d->dedup_table, h, cand_node) {
+		for_each_dedup_cand(d, h, cand_node) {
 			cand = d->btf->types[cand_node->type_id];
 			if (btf_equal_fnproto(t, cand)) {
 				new_id = cand_node->type_id;

tools/lib/bpf/btf.h

@@ -90,6 +90,7 @@ LIBBPF_API __u32 btf_ext__func_info_rec_size(const struct btf_ext *btf_ext);
 LIBBPF_API __u32 btf_ext__line_info_rec_size(const struct btf_ext *btf_ext);
 
 struct btf_dedup_opts {
+	unsigned int dedup_table_size;
 	bool dont_resolve_fwds;
 };