Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=54f9f80d6543fb7b157d3b11e2e7911dc1379790
Commit: 54f9f80d6543fb7b157d3b11e2e7911dc1379790
Parent: e4e574b767ba63101cfda2b42d72f38546319297
Author: Adam Litke <[EMAIL PROTECTED]>
AuthorDate: Tue Oct 16 01:26:20 2007 -0700
Committer: Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Tue Oct 16 09:43:02 2007 -0700
hugetlb: Add hugetlb_dynamic_pool sysctl
The maximum size of the huge page pool can be controlled using the overall
size of the hugetlb filesystem (via its 'size' mount option). However in
the
common case the this will not be set as the pool is traditionally fixed in
size at boot time. In order to maintain the expected semantics, we need to
prevent the pool expanding by default.
This patch introduces a new sysctl controlling dynamic pool resizing. When
this is enabled the pool will expand beyond its base size up to the size of
the hugetlb filesystem. It is disabled by default.
Signed-off-by: Adam Litke <[EMAIL PROTECTED]>
Acked-by: Andy Whitcroft <[EMAIL PROTECTED]>
Acked-by: Dave McCracken <[EMAIL PROTECTED]>
Cc: William Irwin <[EMAIL PROTECTED]>
Cc: David Gibson <[EMAIL PROTECTED]>
Cc: Ken Chen <[EMAIL PROTECTED]>
Cc: Badari Pulavarty <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
include/linux/hugetlb.h | 1 +
kernel/sysctl.c | 8 ++++++++
mm/hugetlb.c | 5 +++++
3 files changed, 14 insertions(+), 0 deletions(-)
diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index 3a19b03..ea0f50b 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -33,6 +33,7 @@ void hugetlb_unreserve_pages(struct inode *inode, long
offset, long freed);
extern unsigned long max_huge_pages;
extern unsigned long hugepages_treat_as_movable;
+extern int hugetlb_dynamic_pool;
extern const unsigned long hugetlb_zero, hugetlb_infinity;
extern int sysctl_hugetlb_shm_group;
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index ec14aa8..96efbb8 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -880,6 +880,14 @@ static ctl_table vm_table[] = {
.mode = 0644,
.proc_handler = &hugetlb_treat_movable_handler,
},
+ {
+ .ctl_name = CTL_UNNUMBERED,
+ .procname = "hugetlb_dynamic_pool",
+ .data = &hugetlb_dynamic_pool,
+ .maxlen = sizeof(hugetlb_dynamic_pool),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec,
+ },
#endif
{
.ctl_name = VM_LOWMEM_RESERVE_RATIO,
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 31bbca6..efd7852 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -31,6 +31,7 @@ static unsigned int free_huge_pages_node[MAX_NUMNODES];
static unsigned int surplus_huge_pages_node[MAX_NUMNODES];
static gfp_t htlb_alloc_mask = GFP_HIGHUSER;
unsigned long hugepages_treat_as_movable;
+int hugetlb_dynamic_pool;
/*
* Protects updates to hugepage_freelists, nr_huge_pages, and free_huge_pages
@@ -201,6 +202,10 @@ static struct page *alloc_buddy_huge_page(struct
vm_area_struct *vma,
{
struct page *page;
+ /* Check if the dynamic pool is enabled */
+ if (!hugetlb_dynamic_pool)
+ return NULL;
+
page = alloc_pages(htlb_alloc_mask|__GFP_COMP|__GFP_NOWARN,
HUGETLB_PAGE_ORDER);
if (page) {
-
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