kernel/user.c suggestion

lxr.linux.no/source/kernel/user.c?v=2.5.56#L81

81 struct user_struct * alloc_uid(uid_t uid)
82 {
83         struct list_head *hashent = uidhashentry(uid);
84         struct user_struct *up;
85 
86         spin_lock(&uidhash_lock);
87         up = uid_hash_find(uid, hashent);
88         spin_unlock(&uidhash_lock);

 

The code uses a hash table with multiple chains to reduce search time but then 
uses a single lock for the whole table??

Suggest one lock per chain for better concurrency so code mod would be 
spin_lock(&uidhash_lock[hashent])

Bob Cook

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