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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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/net/dn.h
View File

@ -225,7 +225,7 @@ extern int decnet_di_count;
extern int decnet_dr_count;
extern int decnet_no_fc_max_cwnd;
extern int sysctl_decnet_mem[3];
extern long sysctl_decnet_mem[3];
extern int sysctl_decnet_wmem[3];
extern int sysctl_decnet_rmem[3];

4
include/net/sock.h
View File

@ -762,7 +762,7 @@ struct proto {
/* Memory pressure */
void (*enter_memory_pressure)(struct sock *sk);
atomic_t *memory_allocated; /* Current allocated memory. */
atomic_long_t *memory_allocated; /* Current allocated memory. */
struct percpu_counter *sockets_allocated; /* Current number of sockets. */
/*
* Pressure flag: try to collapse.
@ -771,7 +771,7 @@ struct proto {
* is strict, actions are advisory and have some latency.
*/
int *memory_pressure;
int *sysctl_mem;
long *sysctl_mem;
int *sysctl_wmem;
int *sysctl_rmem;
int max_header;

6
include/net/tcp.h
View File

@ -224,7 +224,7 @@ extern int sysctl_tcp_fack;
extern int sysctl_tcp_reordering;
extern int sysctl_tcp_ecn;
extern int sysctl_tcp_dsack;
extern int sysctl_tcp_mem[3];
extern long sysctl_tcp_mem[3];
extern int sysctl_tcp_wmem[3];
extern int sysctl_tcp_rmem[3];
extern int sysctl_tcp_app_win;
@ -247,7 +247,7 @@ extern int sysctl_tcp_cookie_size;
extern int sysctl_tcp_thin_linear_timeouts;
extern int sysctl_tcp_thin_dupack;
extern atomic_t tcp_memory_allocated;
extern atomic_long_t tcp_memory_allocated;
extern struct percpu_counter tcp_sockets_allocated;
extern int tcp_memory_pressure;
@ -280,7 +280,7 @@ static inline bool tcp_too_many_orphans(struct sock *sk, int shift)
}
if (sk->sk_wmem_queued > SOCK_MIN_SNDBUF &&
atomic_read(&tcp_memory_allocated) > sysctl_tcp_mem[2])
atomic_long_read(&tcp_memory_allocated) > sysctl_tcp_mem[2])
return true;
return false;
}

4
include/net/udp.h
View File

@ -105,10 +105,10 @@ static inline struct udp_hslot *udp_hashslot2(struct udp_table *table,
extern struct proto udp_prot;
extern atomic_t udp_memory_allocated;
extern atomic_long_t udp_memory_allocated;
/* sysctl variables for udp */
extern int sysctl_udp_mem[3];
extern long sysctl_udp_mem[3];
extern int sysctl_udp_rmem_min;
extern int sysctl_udp_wmem_min;

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 @@ int __sk_mem_schedule(struct sock *sk, int size, int kind)
/* 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",

2
net/decnet/af_decnet.c
View File

@ -155,7 +155,7 @@ static const struct proto_ops dn_proto_ops;
static DEFINE_RWLOCK(dn_hash_lock);
static struct hlist_head dn_sk_hash[DN_SK_HASH_SIZE];
static struct hlist_head dn_wild_sk;
static atomic_t decnet_memory_allocated;
static atomic_long_t decnet_memory_allocated;
static int __dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen, int flags);
static int __dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen, int flags);

4
net/decnet/sysctl_net_decnet.c
View File

@ -38,7 +38,7 @@ int decnet_log_martians = 1;
int decnet_no_fc_max_cwnd = NSP_MIN_WINDOW;
/* Reasonable defaults, I hope, based on tcp's defaults */
int sysctl_decnet_mem[3] = { 768 << 3, 1024 << 3, 1536 << 3 };
long sysctl_decnet_mem[3] = { 768 << 3, 1024 << 3, 1536 << 3 };
int sysctl_decnet_wmem[3] = { 4 * 1024, 16 * 1024, 128 * 1024 };
int sysctl_decnet_rmem[3] = { 4 * 1024, 87380, 87380 * 2 };
@ -324,7 +324,7 @@ static ctl_table dn_table[] = {
.data = &sysctl_decnet_mem,
.maxlen = sizeof(sysctl_decnet_mem),
.mode = 0644,
.proc_handler = proc_dointvec,
.proc_handler = proc_doulongvec_minmax
},
{
.procname = "decnet_rmem",

8
net/ipv4/proc.c
View File

@ -59,13 +59,13 @@ static int sockstat_seq_show(struct seq_file *seq, void *v)
local_bh_enable();
socket_seq_show(seq);
seq_printf(seq, "TCP: inuse %d orphan %d tw %d alloc %d mem %d\n",
seq_printf(seq, "TCP: inuse %d orphan %d tw %d alloc %d mem %ld\n",
sock_prot_inuse_get(net, &tcp_prot), orphans,
tcp_death_row.tw_count, sockets,
atomic_read(&tcp_memory_allocated));
seq_printf(seq, "UDP: inuse %d mem %d\n",
atomic_long_read(&tcp_memory_allocated));
seq_printf(seq, "UDP: inuse %d mem %ld\n",
sock_prot_inuse_get(net, &udp_prot),
atomic_read(&udp_memory_allocated));
atomic_long_read(&udp_memory_allocated));
seq_printf(seq, "UDPLITE: inuse %d\n",
sock_prot_inuse_get(net, &udplite_prot));
seq_printf(seq, "RAW: inuse %d\n",

5
net/ipv4/sysctl_net_ipv4.c
View File

@ -398,7 +398,7 @@ static struct ctl_table ipv4_table[] = {
.data = &sysctl_tcp_mem,
.maxlen = sizeof(sysctl_tcp_mem),
.mode = 0644,
.proc_handler = proc_dointvec
.proc_handler = proc_doulongvec_minmax
},
{
.procname = "tcp_wmem",
@ -602,8 +602,7 @@ static struct ctl_table ipv4_table[] = {
.data = &sysctl_udp_mem,
.maxlen = sizeof(sysctl_udp_mem),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = &zero
.proc_handler = proc_doulongvec_minmax,
},
{
.procname = "udp_rmem_min",

4
net/ipv4/tcp.c
View File

@ -282,7 +282,7 @@ int sysctl_tcp_fin_timeout __read_mostly = TCP_FIN_TIMEOUT;
struct percpu_counter tcp_orphan_count;
EXPORT_SYMBOL_GPL(tcp_orphan_count);
int sysctl_tcp_mem[3] __read_mostly;
long sysctl_tcp_mem[3] __read_mostly;
int sysctl_tcp_wmem[3] __read_mostly;
int sysctl_tcp_rmem[3] __read_mostly;
@ -290,7 +290,7 @@ EXPORT_SYMBOL(sysctl_tcp_mem);
EXPORT_SYMBOL(sysctl_tcp_rmem);
EXPORT_SYMBOL(sysctl_tcp_wmem);
atomic_t tcp_memory_allocated; /* Current allocated memory. */
atomic_long_t tcp_memory_allocated; /* Current allocated memory. */
EXPORT_SYMBOL(tcp_memory_allocated);
/*

11
net/ipv4/tcp_input.c
View File

@ -259,8 +259,11 @@ static void tcp_fixup_sndbuf(struct sock *sk)
int sndmem = tcp_sk(sk)->rx_opt.mss_clamp + MAX_TCP_HEADER + 16 +
sizeof(struct sk_buff);
if (sk->sk_sndbuf < 3 * sndmem)
sk->sk_sndbuf = min(3 * sndmem, sysctl_tcp_wmem[2]);
if (sk->sk_sndbuf < 3 * sndmem) {
sk->sk_sndbuf = 3 * sndmem;
if (sk->sk_sndbuf > sysctl_tcp_wmem[2])
sk->sk_sndbuf = sysctl_tcp_wmem[2];
}
}
/* 2. Tuning advertised window (window_clamp, rcv_ssthresh)
@ -396,7 +399,7 @@ static void tcp_clamp_window(struct sock *sk)
if (sk->sk_rcvbuf < sysctl_tcp_rmem[2] &&
!(sk->sk_userlocks & SOCK_RCVBUF_LOCK) &&
!tcp_memory_pressure &&
atomic_read(&tcp_memory_allocated) < sysctl_tcp_mem[0]) {
atomic_long_read(&tcp_memory_allocated) < sysctl_tcp_mem[0]) {
sk->sk_rcvbuf = min(atomic_read(&sk->sk_rmem_alloc),
sysctl_tcp_rmem[2]);
}
@ -4861,7 +4864,7 @@ static int tcp_should_expand_sndbuf(struct sock *sk)
return 0;
/* If we are under soft global TCP memory pressure, do not expand. */
if (atomic_read(&tcp_memory_allocated) >= sysctl_tcp_mem[0])
if (atomic_long_read(&tcp_memory_allocated) >= sysctl_tcp_mem[0])
return 0;
/* If we filled the congestion window, do not expand. */

4
net/ipv4/udp.c
View File

@ -110,7 +110,7 @@
struct udp_table udp_table __read_mostly;
EXPORT_SYMBOL(udp_table);
int sysctl_udp_mem[3] __read_mostly;
long sysctl_udp_mem[3] __read_mostly;
EXPORT_SYMBOL(sysctl_udp_mem);
int sysctl_udp_rmem_min __read_mostly;
@ -119,7 +119,7 @@ EXPORT_SYMBOL(sysctl_udp_rmem_min);
int sysctl_udp_wmem_min __read_mostly;
EXPORT_SYMBOL(sysctl_udp_wmem_min);
atomic_t udp_memory_allocated;
atomic_long_t udp_memory_allocated;
EXPORT_SYMBOL(udp_memory_allocated);
#define MAX_UDP_PORTS 65536

2
net/sctp/protocol.c
View File

@ -92,7 +92,7 @@ static struct sctp_af *sctp_af_v6_specific;
struct kmem_cache *sctp_chunk_cachep __read_mostly;
struct kmem_cache *sctp_bucket_cachep __read_mostly;
int sysctl_sctp_mem[3];
long sysctl_sctp_mem[3];
int sysctl_sctp_rmem[3];
int sysctl_sctp_wmem[3];

4
net/sctp/socket.c
View File

@ -111,12 +111,12 @@ static void sctp_sock_migrate(struct sock *, struct sock *,
static char *sctp_hmac_alg = SCTP_COOKIE_HMAC_ALG;
extern struct kmem_cache *sctp_bucket_cachep;
extern int sysctl_sctp_mem[3];
extern long sysctl_sctp_mem[3];
extern int sysctl_sctp_rmem[3];
extern int sysctl_sctp_wmem[3];
static int sctp_memory_pressure;
static atomic_t sctp_memory_allocated;
static atomic_long_t sctp_memory_allocated;
struct percpu_counter sctp_sockets_allocated;
static void sctp_enter_memory_pressure(struct sock *sk)

4
net/sctp/sysctl.c
View File

@ -54,7 +54,7 @@ static int sack_timer_max = 500;
static int addr_scope_max = 3; /* check sctp_scope_policy_t in include/net/sctp/constants.h for max entries */
static int rwnd_scale_max = 16;
extern int sysctl_sctp_mem[3];
extern long sysctl_sctp_mem[3];
extern int sysctl_sctp_rmem[3];
extern int sysctl_sctp_wmem[3];
@ -203,7 +203,7 @@ static ctl_table sctp_table[] = {
.data = &sysctl_sctp_mem,
.maxlen = sizeof(sysctl_sctp_mem),
.mode = 0644,
.proc_handler = proc_dointvec,
.proc_handler = proc_doulongvec_minmax
},
{
.procname = "sctp_rmem",