mm: zero hash tables in allocator
Add a new flag HASH_ZERO which when provided grantees that the hash
table that is returned by alloc_large_system_hash() is zeroed. In most
cases that is what is needed by the caller. Use page level allocator's
__GFP_ZERO flags to zero the memory. It is using memset() which is
efficient method to zero memory and is optimized for most platforms.
Link: http://lkml.kernel.org/r/1488432825-92126-3-git-send-email-pasha.tatashin@oracle.com
Signed-off-by: Pavel Tatashin <pasha.tatashin@oracle.com>
Reviewed-by: Babu Moger <babu.moger@oracle.com>
Cc: David Miller <davem@davemloft.net>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 387f20d..34240e2 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -7198,6 +7198,7 @@
unsigned long long max = high_limit;
unsigned long log2qty, size;
void *table = NULL;
+ gfp_t gfp_flags;
/* allow the kernel cmdline to have a say */
if (!numentries) {
@@ -7242,12 +7243,17 @@
log2qty = ilog2(numentries);
+ /*
+ * memblock allocator returns zeroed memory already, so HASH_ZERO is
+ * currently not used when HASH_EARLY is specified.
+ */
+ gfp_flags = (flags & HASH_ZERO) ? GFP_ATOMIC | __GFP_ZERO : GFP_ATOMIC;
do {
size = bucketsize << log2qty;
if (flags & HASH_EARLY)
table = memblock_virt_alloc_nopanic(size, 0);
else if (hashdist)
- table = __vmalloc(size, GFP_ATOMIC, PAGE_KERNEL);
+ table = __vmalloc(size, gfp_flags, PAGE_KERNEL);
else {
/*
* If bucketsize is not a power-of-two, we may free
@@ -7255,8 +7261,8 @@
* alloc_pages_exact() automatically does
*/
if (get_order(size) < MAX_ORDER) {
- table = alloc_pages_exact(size, GFP_ATOMIC);
- kmemleak_alloc(table, size, 1, GFP_ATOMIC);
+ table = alloc_pages_exact(size, gfp_flags);
+ kmemleak_alloc(table, size, 1, gfp_flags);
}
}
} while (!table && size > PAGE_SIZE && --log2qty);