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selinux: print sum of chain lengths^2 for hash tables

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Print the sum of chain lengths squared as a metric for hash tables to
provide more insights, similar to avtabs.

While on it add a comma in the avtab message to improve readability of
the output.

Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
Reviewed-by: Stephen Smalley <stephen.smalley.work@gmail.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
This commit is contained in:
Christian Göttsche 2023-08-18 17:12:18 +02:00 committed by Paul Moore
parent 34df25517a
commit fb8142ff4a
4 changed files with 9 additions and 3 deletions
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2
security/selinux/ss/avtab.c
View File

@ -349,7 +349,7 @@ void avtab_hash_eval(struct avtab *h, const char *tag)
} }
pr_debug("SELinux: %s: %d entries and %d/%d buckets used, " pr_debug("SELinux: %s: %d entries and %d/%d buckets used, "
"longest chain length %d sum of chain length^2 %llu\n", "longest chain length %d, sum of chain length^2 %llu\n",
tag, h->nel, slots_used, h->nslot, max_chain_len, tag, h->nel, slots_used, h->nslot, max_chain_len,
chain2_len_sum); chain2_len_sum);
} }

5
security/selinux/ss/hashtab.c
View File

@ -107,10 +107,12 @@ int hashtab_map(struct hashtab *h,
void hashtab_stat(struct hashtab *h, struct hashtab_info *info) void hashtab_stat(struct hashtab *h, struct hashtab_info *info)
{ {
u32 i, chain_len, slots_used, max_chain_len; u32 i, chain_len, slots_used, max_chain_len;
u64 chain2_len_sum;
struct hashtab_node *cur; struct hashtab_node *cur;
slots_used = 0; slots_used = 0;
max_chain_len = 0; max_chain_len = 0;
chain2_len_sum = 0;
for (i = 0; i < h->size; i++) { for (i = 0; i < h->size; i++) {
cur = h->htable[i]; cur = h->htable[i];
if (cur) { if (cur) {
@ -123,11 +125,14 @@ void hashtab_stat(struct hashtab *h, struct hashtab_info *info)
if (chain_len > max_chain_len) if (chain_len > max_chain_len)
max_chain_len = chain_len; max_chain_len = chain_len;
chain2_len_sum += (u64)chain_len * chain_len;
} }
} }
info->slots_used = slots_used; info->slots_used = slots_used;
info->max_chain_len = max_chain_len; info->max_chain_len = max_chain_len;
info->chain2_len_sum = chain2_len_sum;
} }
#endif /* CONFIG_SECURITY_SELINUX_DEBUG */ #endif /* CONFIG_SECURITY_SELINUX_DEBUG */

1
security/selinux/ss/hashtab.h
View File

@ -38,6 +38,7 @@ struct hashtab {
struct hashtab_info { struct hashtab_info {
u32 slots_used; u32 slots_used;
u32 max_chain_len; u32 max_chain_len;
u64 chain2_len_sum;
}; };
/* /*

4
security/selinux/ss/policydb.c
View File

@ -684,9 +684,9 @@ static void hash_eval(struct hashtab *h, const char *hash_name)
struct hashtab_info info; struct hashtab_info info;
hashtab_stat(h, &info); hashtab_stat(h, &info);
pr_debug("SELinux: %s: %d entries and %d/%d buckets used, longest chain length %d\n", pr_debug("SELinux: %s: %d entries and %d/%d buckets used, longest chain length %d, sum of chain length^2 %llu\n",
hash_name, h->nel, info.slots_used, h->size, hash_name, h->nel, info.slots_used, h->size,
info.max_chain_len); info.max_chain_len, info.chain2_len_sum);
} }
static void symtab_hash_eval(struct symtab *s) static void symtab_hash_eval(struct symtab *s)