The patch titled
hugetlb: Add hugetlb_dynamic_pool sysctl
has been added to the -mm tree. Its filename is
hugetlb-add-hugetlb_dynamic_pool-sysctl.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: hugetlb: Add hugetlb_dynamic_pool sysctl
From: Adam Litke <[EMAIL PROTECTED]>
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]>
---
diff -puN include/linux/hugetlb.h~hugetlb-add-hugetlb_dynamic_pool-sysctl
include/linux/hugetlb.h
--- a/include/linux/hugetlb.h~hugetlb-add-hugetlb_dynamic_pool-sysctl
+++ a/include/linux/hugetlb.h
@@ -33,6 +33,7 @@ void hugetlb_unreserve_pages(struct inod
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 -puN kernel/sysctl.c~hugetlb-add-hugetlb_dynamic_pool-sysctl
kernel/sysctl.c
--- a/kernel/sysctl.c~hugetlb-add-hugetlb_dynamic_pool-sysctl
+++ a/kernel/sysctl.c
@@ -872,6 +872,14 @@ 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 -puN mm/hugetlb.c~hugetlb-add-hugetlb_dynamic_pool-sysctl mm/hugetlb.c
--- a/mm/hugetlb.c~hugetlb-add-hugetlb_dynamic_pool-sysctl
+++ a/mm/hugetlb.c
@@ -31,6 +31,7 @@ static unsigned int free_huge_pages_node
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_pag
{
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) {
_
Patches currently in -mm which might be from [EMAIL PROTECTED] are
hugetlb-move-update_and_free_page.patch
hugetlb-try-to-grow-hugetlb-pool-for-map_private-mappings.patch
hugetlb-try-to-grow-hugetlb-pool-for-map_shared-mappings.patch
hugetlb-add-hugetlb_dynamic_pool-sysctl.patch
hugetlb-allow-extending-ftruncate-on-hugetlbfs.patch
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