lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

mm: add a low limit to alloc_large_system_hash

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

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;