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mm: add a low limit to alloc_large_system_hash 

UDP stack needs a minimum hash size value for proper operation and also
uses alloc_large_system_hash() for proper NUMA distribution of its hash
tables and automatic sizing depending on available system memory.

On some low memory situations, udp_table_init() must ignore the
alloc_large_system_hash() result and reallocs a bigger memory area.

As we cannot easily free old hash table, we leak it and kmemleak can
issue a warning.

This patch adds a low limit parameter to alloc_large_system_hash() to
solve this problem.

We then specify UDP_HTABLE_SIZE_MIN for UDP/UDPLite hash table
allocation.

Reported-by: Mark Asselstine <mark.asselstine@windriver.com>
Reported-by: Tim Bird <tim.bird@am.sony.com>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tim Bird 2012-05-23 13:33:35 +00:00 committed by David S. Miller
parent d0a24a3516
commit 31fe62b958
8 changed files with 26 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
fs/dcache.c
View File

@ -3093,6 +3093,7 @@ static void __init dcache_init_early(void)
HASH_EARLY,
&d_hash_shift,
&d_hash_mask,
0,
0);
for (loop = 0; loop < (1U << d_hash_shift); loop++)
@ -3123,6 +3124,7 @@ static void __init dcache_init(void)
0,
&d_hash_shift,
&d_hash_mask,
0,
0);
for (loop = 0; loop < (1U << d_hash_shift); loop++)

2
fs/inode.c
View File

@ -1647,6 +1647,7 @@ void __init inode_init_early(void)
HASH_EARLY,
&i_hash_shift,
&i_hash_mask,
0,
0);
for (loop = 0; loop < (1U << i_hash_shift); loop++)
@ -1677,6 +1678,7 @@ void __init inode_init(void)
0,
&i_hash_shift,
&i_hash_mask,
0,
0);
for (loop = 0; loop < (1U << i_hash_shift); loop++)

3
include/linux/bootmem.h
View File

@ -154,7 +154,8 @@ extern void *alloc_large_system_hash(const char *tablename,
int flags,
unsigned int *_hash_shift,
unsigned int *_hash_mask,
unsigned long limit);
unsigned long low_limit,
unsigned long high_limit);
#define HASH_EARLY 0x00000001 /* Allocating during early boot? */
#define HASH_SMALL 0x00000002 /* sub-page allocation allowed, min

3
kernel/pid.c
View File

@ -547,7 +547,8 @@ void __init pidhash_init(void)
pid_hash = alloc_large_system_hash("PID", sizeof(*pid_hash), 0, 18,
HASH_EARLY | HASH_SMALL,
&pidhash_shift, NULL, 4096);
&pidhash_shift, NULL,
0, 4096);
pidhash_size = 1U << pidhash_shift;
for (i = 0; i < pidhash_size; i++)

7
mm/page_alloc.c
View File

@ -5242,9 +5242,10 @@ void *__init alloc_large_system_hash(const char *tablename,
int flags,
unsigned int *_hash_shift,
unsigned int *_hash_mask,
unsigned long limit)
unsigned long low_limit,
unsigned long high_limit)
{
unsigned long long max = limit;
unsigned long long max = high_limit;
unsigned long log2qty, size;
void *table = NULL;
@ -5282,6 +5283,8 @@ void *__init alloc_large_system_hash(const char *tablename,
}
max = min(max, 0x80000000ULL);
if (numentries < low_limit)
numentries = low_limit;
if (numentries > max)
numentries = max;

1
net/ipv4/route.c
View File

@ -3452,6 +3452,7 @@ int __init ip_rt_init(void)
0,
&rt_hash_log,
&rt_hash_mask,
0,
rhash_entries ? 0 : 512 * 1024);
memset(rt_hash_table, 0, (rt_hash_mask + 1) * sizeof(struct rt_hash_bucket));
rt_hash_lock_init();

2
net/ipv4/tcp.c
View File

@ -3514,6 +3514,7 @@ void __init tcp_init(void)
0,
NULL,
&tcp_hashinfo.ehash_mask,
0,
thash_entries ? 0 : 512 * 1024);
for (i = 0; i <= tcp_hashinfo.ehash_mask; i++) {
INIT_HLIST_NULLS_HEAD(&tcp_hashinfo.ehash[i].chain, i);
@ -3530,6 +3531,7 @@ void __init tcp_init(void)
0,
&tcp_hashinfo.bhash_size,
NULL,
0,
64 * 1024);
tcp_hashinfo.bhash_size = 1U << tcp_hashinfo.bhash_size;
for (i = 0; i < tcp_hashinfo.bhash_size; i++) {

30
net/ipv4/udp.c
View File

@ -2192,26 +2192,16 @@ void __init udp_table_init(struct udp_table *table, const char *name)
{
unsigned int i;
if (!CONFIG_BASE_SMALL)
table->hash = alloc_large_system_hash(name,
2 * sizeof(struct udp_hslot),
uhash_entries,
21, /* one slot per 2 MB */
0,
&table->log,
&table->mask,
64 * 1024);
/*
* Make sure hash table has the minimum size
*/
if (CONFIG_BASE_SMALL || table->mask < UDP_HTABLE_SIZE_MIN - 1) {
table->hash = kmalloc(UDP_HTABLE_SIZE_MIN *
2 * sizeof(struct udp_hslot), GFP_KERNEL);
if (!table->hash)
panic(name);
table->log = ilog2(UDP_HTABLE_SIZE_MIN);
table->mask = UDP_HTABLE_SIZE_MIN - 1;
}
table->hash = alloc_large_system_hash(name,
2 * sizeof(struct udp_hslot),
uhash_entries,
21, /* one slot per 2 MB */
0,
&table->log,
&table->mask,
UDP_HTABLE_SIZE_MIN,
64 * 1024);
table->hash2 = table->hash + (table->mask + 1);
for (i = 0; i <= table->mask; i++) {
INIT_HLIST_NULLS_HEAD(&table->hash[i].head, i);