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net: avoid limits overflow

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Robin Holt tried to boot a 16TB machine and found some limits were
reached : sysctl_tcp_mem[2], sysctl_udp_mem[2]

We can switch infrastructure to use long "instead" of "int", now
atomic_long_t primitives are available for free.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Reported-by: Robin Holt <holt@sgi.com>
Reviewed-by: Robin Holt <holt@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2010-11-09 23:24:26 +00:00 • committed by David S. Miller
parent 67286640f6
commit 8d987e5c75
15 changed files with 40 additions and 38 deletions
Download patch file Download diff file Expand all files Collapse all files

14
net/core/sock.c
View file

@ -1653,10 +1653,10 @@ int __sk_mem_schedule(struct sock *sk, int size, int kind)
{
struct proto *prot = sk->sk_prot;
int amt = sk_mem_pages(size);
int allocated;
long allocated;
sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
allocated = atomic_add_return(amt, prot->memory_allocated);
allocated = atomic_long_add_return(amt, prot->memory_allocated);
/* Under limit. */
if (allocated <= prot->sysctl_mem[0]) {
@ -1714,7 +1714,7 @@ suppress_allocation:
/* Alas. Undo changes. */
sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
atomic_sub(amt, prot->memory_allocated);
atomic_long_sub(amt, prot->memory_allocated);
return 0;
}
EXPORT_SYMBOL(__sk_mem_schedule);
@ -1727,12 +1727,12 @@ void __sk_mem_reclaim(struct sock *sk)
{
struct proto *prot = sk->sk_prot;
atomic_sub(sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT,
atomic_long_sub(sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT,
prot->memory_allocated);
sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1;
if (prot->memory_pressure && *prot->memory_pressure &&
(atomic_read(prot->memory_allocated) < prot->sysctl_mem[0]))
(atomic_long_read(prot->memory_allocated) < prot->sysctl_mem[0]))
*prot->memory_pressure = 0;
}
EXPORT_SYMBOL(__sk_mem_reclaim);
@ -2452,12 +2452,12 @@ static char proto_method_implemented(const void *method)
static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
{
seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s "
seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
"%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
proto->name,
proto->obj_size,
sock_prot_inuse_get(seq_file_net(seq), proto),
proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1,
proto->memory_allocated != NULL ? atomic_long_read(proto->memory_allocated) : -1L,
proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI",
proto->max_header,
proto->slab == NULL ? "no" : "yes",