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tcp/dccp: shrink struct listen_sock 

We no longer use hash_rnd, nr_table_entries and syn_table[]

For a listener with a backlog of 10 millions sockets, this
saves 80 MBytes of vmalloced memory.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2015-10-02 11:43:33 -07:00 committed by David S. Miller
parent 079096f103
commit 81b496b31a
2 changed files with 3 additions and 14 deletions
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3
include/net/request_sock.h
View File

@ -125,9 +125,6 @@ extern int sysctl_max_syn_backlog;
*/
struct listen_sock {
u32 max_qlen_log;
u32 hash_rnd;
u32 nr_table_entries;
struct request_sock *syn_table[0];
};
/*

14
net/core/request_sock.c
View File

@ -46,18 +46,11 @@ int reqsk_queue_alloc(struct request_sock_queue *queue,
nr_table_entries = min_t(u32, nr_table_entries, sysctl_max_syn_backlog);
nr_table_entries = max_t(u32, nr_table_entries, 8);
nr_table_entries = roundup_pow_of_two(nr_table_entries + 1);
lopt_size += nr_table_entries * sizeof(struct request_sock *);
if (lopt_size <= (PAGE_SIZE << PAGE_ALLOC_COSTLY_ORDER))
lopt = kzalloc(lopt_size, GFP_KERNEL |
__GFP_NOWARN |
__GFP_NORETRY);
if (!lopt)
lopt = vzalloc(lopt_size);
lopt = kzalloc(lopt_size, GFP_KERNEL);
if (!lopt)
return -ENOMEM;
get_random_bytes(&lopt->hash_rnd, sizeof(lopt->hash_rnd));
spin_lock_init(&queue->rskq_lock);
spin_lock_init(&queue->syn_wait_lock);
@ -68,7 +61,6 @@ int reqsk_queue_alloc(struct request_sock_queue *queue,
queue->fastopenq.max_qlen = 0;
queue->rskq_accept_head = NULL;
lopt->nr_table_entries = nr_table_entries;
lopt->max_qlen_log = ilog2(nr_table_entries);
spin_lock_bh(&queue->syn_wait_lock);
@ -81,7 +73,7 @@ int reqsk_queue_alloc(struct request_sock_queue *queue,
void __reqsk_queue_destroy(struct request_sock_queue *queue)
{
/* This is an error recovery path only, no locking needed */
kvfree(queue->listen_opt);
kfree(queue->listen_opt);
}
static inline struct listen_sock *reqsk_queue_yank_listen_sk(
@ -102,7 +94,7 @@ void reqsk_queue_destroy(struct request_sock_queue *queue)
struct listen_sock *lopt = reqsk_queue_yank_listen_sk(queue);
/* cleaning is done by req timers */
kvfree(lopt);
kfree(lopt);
}
/*