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tcp: replace ehash_size by ehash_mask

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Storing the mask (size - 1) instead of the size allows fast path to be
a bit faster.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet
2009-10-09 00:16:19 +00:00
committed by David S. Miller
parent c3faca053d
commit f373b53b5f
8 changed files with 21 additions and 21 deletions
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13
net/dccp/proto.c
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@ -1060,11 +1060,12 @@ static int __init dccp_init(void)
for (ehash_order = 0; (1UL << ehash_order) < goal; ehash_order++)
;
do {
dccp_hashinfo.ehash_size = (1UL << ehash_order) * PAGE_SIZE /
unsigned long hash_size = (1UL << ehash_order) * PAGE_SIZE /
sizeof(struct inet_ehash_bucket);
while (dccp_hashinfo.ehash_size &
(dccp_hashinfo.ehash_size - 1))
dccp_hashinfo.ehash_size--;
while (hash_size & (hash_size - 1))
hash_size--;
dccp_hashinfo.ehash_mask = hash_size - 1;
dccp_hashinfo.ehash = (struct inet_ehash_bucket *)
__get_free_pages(GFP_ATOMIC|__GFP_NOWARN, ehash_order);
} while (!dccp_hashinfo.ehash && --ehash_order > 0);
@ -1074,7 +1075,7 @@ static int __init dccp_init(void)
goto out_free_bind_bucket_cachep;
}
for (i = 0; i < dccp_hashinfo.ehash_size; i++) {
for (i = 0; i <= dccp_hashinfo.ehash_mask; i++) {
INIT_HLIST_NULLS_HEAD(&dccp_hashinfo.ehash[i].chain, i);
INIT_HLIST_NULLS_HEAD(&dccp_hashinfo.ehash[i].twchain, i);
}
@ -1153,7 +1154,7 @@ static void __exit dccp_fini(void)
get_order(dccp_hashinfo.bhash_size *
sizeof(struct inet_bind_hashbucket)));
free_pages((unsigned long)dccp_hashinfo.ehash,
get_order(dccp_hashinfo.ehash_size *
get_order((dccp_hashinfo.ehash_mask + 1) *
sizeof(struct inet_ehash_bucket)));
inet_ehash_locks_free(&dccp_hashinfo);
kmem_cache_destroy(dccp_hashinfo.bind_bucket_cachep);