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net: convert TCP/DCCP ehash rwlocks to spinlocks

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Now TCP & DCCP use RCU lookups, we can convert ehash rwlocks to spinlocks.

/proc/net/tcp and other seq_file 'readers' can safely be converted to 'writers'.

This should speedup writers, since spin_lock()/spin_unlock()
only use one atomic operation instead of two for write_lock()/write_unlock()

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2008-11-20 20:39:09 -08:00 • committed by David S. Miller
parent b8c26a33c8
commit 9db66bdcc8
5 changed files with 41 additions and 43 deletions
Download patch file Download diff file Expand all files Collapse all files

14
include/net/inet_hashtables.h
View file

@ -116,7 +116,7 @@ struct inet_hashinfo {
* TIME_WAIT sockets use a separate chain (twchain).
*/
struct inet_ehash_bucket *ehash;
rwlock_t *ehash_locks;
spinlock_t *ehash_locks;
unsigned int ehash_size;
unsigned int ehash_locks_mask;
@ -152,7 +152,7 @@ static inline struct inet_ehash_bucket *inet_ehash_bucket(
return &hashinfo->ehash[hash & (hashinfo->ehash_size - 1)];
}
static inline rwlock_t *inet_ehash_lockp(
static inline spinlock_t *inet_ehash_lockp(
struct inet_hashinfo *hashinfo,
unsigned int hash)
{
@ -177,16 +177,16 @@ static inline int inet_ehash_locks_alloc(struct inet_hashinfo *hashinfo)
size = 4096;
if (sizeof(rwlock_t) != 0) {
#ifdef CONFIG_NUMA
if (size * sizeof(rwlock_t) > PAGE_SIZE)
hashinfo->ehash_locks = vmalloc(size * sizeof(rwlock_t));
if (size * sizeof(spinlock_t) > PAGE_SIZE)
hashinfo->ehash_locks = vmalloc(size * sizeof(spinlock_t));
else
#endif
hashinfo->ehash_locks = kmalloc(size * sizeof(rwlock_t),
hashinfo->ehash_locks = kmalloc(size * sizeof(spinlock_t),
GFP_KERNEL);
if (!hashinfo->ehash_locks)
return ENOMEM;
for (i = 0; i < size; i++)
rwlock_init(&hashinfo->ehash_locks[i]);
spin_lock_init(&hashinfo->ehash_locks[i]);
}
hashinfo->ehash_locks_mask = size - 1;
return 0;
@ -197,7 +197,7 @@ static inline void inet_ehash_locks_free(struct inet_hashinfo *hashinfo)
if (hashinfo->ehash_locks) {
#ifdef CONFIG_NUMA
unsigned int size = (hashinfo->ehash_locks_mask + 1) *
sizeof(rwlock_t);
sizeof(spinlock_t);
if (size > PAGE_SIZE)
vfree(hashinfo->ehash_locks);
else