summaryrefslogtreecommitdiffstats
path: root/mm
diff options
context:
space:
mode:
authorSrikar Dronamraju <srikar@linux.vnet.ibm.com>2016-10-07 16:59:15 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-10-07 18:46:28 -0700
commitf6f34b4387d9e18304451a131b35d7c4f27a0b5a (patch)
treeb5098f74ab735fbac404c4acab5d6c5cd2fe54e4 /mm
parentc9634cf012321243ee8e4ea0fb0709904cd58395 (diff)
downloadlinux-f6f34b4387d9e18304451a131b35d7c4f27a0b5a.tar.bz2
mm: introduce arch_reserved_kernel_pages()
Currently arch specific code can reserve memory blocks but alloc_large_system_hash() may not take it into consideration when sizing the hashes. This can lead to bigger hash than required and lead to no available memory for other purposes. This is specifically true for systems with CONFIG_DEFERRED_STRUCT_PAGE_INIT enabled. One approach to solve this problem would be to walk through the memblock regions and calculate the available memory and base the size of hash system on the available memory. The other approach would be to depend on the architecture to provide the number of pages that are reserved. This change provides hooks to allow the architecture to provide the required info. Link: http://lkml.kernel.org/r/1472476010-4709-2-git-send-email-srikar@linux.vnet.ibm.com Signed-off-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com> Suggested-by: Mel Gorman <mgorman@techsingularity.net> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Michal Hocko <mhocko@kernel.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com> Cc: Hari Bathini <hbathini@linux.vnet.ibm.com> Cc: Dave Hansen <dave.hansen@intel.com> Cc: Balbir Singh <bsingharora@gmail.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/page_alloc.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index f6a5a221496a..e00f545c2398 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -6940,6 +6940,17 @@ static int __init set_hashdist(char *str)
__setup("hashdist=", set_hashdist);
#endif
+#ifndef __HAVE_ARCH_RESERVED_KERNEL_PAGES
+/*
+ * Returns the number of pages that arch has reserved but
+ * is not known to alloc_large_system_hash().
+ */
+static unsigned long __init arch_reserved_kernel_pages(void)
+{
+ return 0;
+}
+#endif
+
/*
* allocate a large system hash table from bootmem
* - it is assumed that the hash table must contain an exact power-of-2
@@ -6964,6 +6975,7 @@ void *__init alloc_large_system_hash(const char *tablename,
if (!numentries) {
/* round applicable memory size up to nearest megabyte */
numentries = nr_kernel_pages;
+ numentries -= arch_reserved_kernel_pages();
/* It isn't necessary when PAGE_SIZE >= 1MB */
if (PAGE_SHIFT < 20)