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SELinux: tune avtab to reduce memory usage

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This patch reduces memory usage of SELinux by tuning avtab. Number of hash
slots in avtab was 32768. Unused slots used memory when number of rules is
fewer. This patch decides number of hash slots dynamically based on number
of rules. (chain length)^2 is also printed out in avtab_hash_eval to see
standard deviation of avtab hash table.

Signed-off-by: Yuichi Nakamura<ynakam@hitachisoft.jp>
Acked-by:  Stephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: James Morris <jmorris@namei.org>
This commit is contained in:
Yuichi Nakamura 2007-08-24 11:55:11 +09:00 • committed by James Morris
parent 821f3eff7c
commit 3232c110b5
4 changed files with 82 additions and 36 deletions
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4
security/selinux/ss/conditional.c
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@ -456,6 +456,10 @@ int cond_read_list(struct policydb *p, void *fp)
len = le32_to_cpu(buf[0]);
rc = avtab_alloc(&(p->te_cond_avtab), p->te_avtab.nel);
if (rc)
goto err;
for (i = 0; i < len; i++) {
node = kzalloc(sizeof(struct cond_node), GFP_KERNEL);
if (!node)