Commit e11bfbfc authored by Nick Piggin's avatar Nick Piggin Committed by Linus Torvalds
Browse files

hugetlb: override default huge page size

Allow configurations with the default huge page size which is different to
the traditional HPAGE_SIZE size.  The default huge page size is the one
represented in the legacy /proc ABIs, SHM, and which is defaulted to when
mounting hugetlbfs filesystems.

This is implemented with a new kernel option default_hugepagesz=, which
defaults to HPAGE_SIZE if not specified.
Signed-off-by: default avatarNick Piggin <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarLinus Torvalds <>
parent b4718e62
......@@ -783,6 +783,13 @@ and is between 256 and 4096 characters. It is defined in the file
CPU supports the "pdpe1gb" cpuinfo flag)
Note that 1GB pages can only be allocated at boot time
using hugepages= and not freed afterwards.
[same as hugepagesz=] The size of the default
HugeTLB page size. This is the size represented by
the legacy /proc/ hugepages APIs, used for SHM, and
default size when mounting hugetlbfs filesystems.
Defaults to the default architecture's huge page size
if not specified. [HW] Put keyboard port into non-translated mode
i8042.dumbkbd [HW] Pretend that controller can only read data from
......@@ -34,6 +34,7 @@ struct hstate hstates[HUGE_MAX_HSTATE];
/* for command line parsing */
static struct hstate * __initdata parsed_hstate;
static unsigned long __initdata default_hstate_max_huge_pages;
static unsigned long __initdata default_hstate_size;
#define for_each_hstate(h) \
for ((h) = hstates; (h) < &hstates[max_hstate]; (h)++)
......@@ -1288,11 +1289,14 @@ static int __init hugetlb_init(void)
if (!size_to_hstate(HPAGE_SIZE)) {
parsed_hstate->max_huge_pages = default_hstate_max_huge_pages;
if (!size_to_hstate(default_hstate_size)) {
default_hstate_size = HPAGE_SIZE;
if (!size_to_hstate(default_hstate_size))
default_hstate_idx = size_to_hstate(HPAGE_SIZE) - hstates;
default_hstate_idx = size_to_hstate(default_hstate_size) - hstates;
if (default_hstate_max_huge_pages)
default_hstate.max_huge_pages = default_hstate_max_huge_pages;
......@@ -1332,7 +1336,7 @@ void __init hugetlb_add_hstate(unsigned order)
parsed_hstate = h;
static int __init hugetlb_setup(char *s)
static int __init hugetlb_nrpages_setup(char *s)
unsigned long *mhp;
static unsigned long *last_mhp;
......@@ -1367,7 +1371,14 @@ static int __init hugetlb_setup(char *s)
return 1;
__setup("hugepages=", hugetlb_setup);
__setup("hugepages=", hugetlb_nrpages_setup);
static int __init hugetlb_default_setup(char *s)
default_hstate_size = memparse(s, &s);
return 1;
__setup("default_hugepagesz=", hugetlb_default_setup);
static unsigned int cpuset_mems_nr(unsigned int *array)
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