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mm: hugetlb_vmemmap: cleanup hugetlb_free_vmemmap_enabled* 

The word of "free" is not expressive enough to express the feature of
optimizing vmemmap pages associated with each HugeTLB, rename this keywork
to "optimize".  In this patch , cheanup the static key and
hugetlb_free_vmemmap_enabled() to make code more expressive.

Link: https://lkml.kernel.org/r/20220404074652.68024-3-songmuchun@bytedance.com
Signed-off-by: Muchun Song <songmuchun@bytedance.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Muchun Song 2022-04-28 23:16:15 -07:00 committed by akpm
parent 5981611d0a
commit f10f1442c3
4 changed files with 13 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/arm64/mm/flush.c
View File

@ -86,7 +86,7 @@ void flush_dcache_page(struct page *page)
* is reused (more details can refer to the comments above
* page_fixed_fake_head()).
*/
if (hugetlb_free_vmemmap_enabled() && PageHuge(page))
if (hugetlb_optimize_vmemmap_enabled() && PageHuge(page))
page = compound_head(page);
if (test_bit(PG_dcache_clean, &page->flags))

12
include/linux/page-flags.h
View File

@ -192,16 +192,16 @@ enum pageflags {
#ifdef CONFIG_HUGETLB_PAGE_FREE_VMEMMAP
DECLARE_STATIC_KEY_MAYBE(CONFIG_HUGETLB_PAGE_FREE_VMEMMAP_DEFAULT_ON,
hugetlb_free_vmemmap_enabled_key);
hugetlb_optimize_vmemmap_key);
static __always_inline bool hugetlb_free_vmemmap_enabled(void)
static __always_inline bool hugetlb_optimize_vmemmap_enabled(void)
{
return static_branch_maybe(CONFIG_HUGETLB_PAGE_FREE_VMEMMAP_DEFAULT_ON,
&hugetlb_free_vmemmap_enabled_key);
&hugetlb_optimize_vmemmap_key);
}
/*
* If the feature of freeing some vmemmap pages associated with each HugeTLB
* If the feature of optimizing vmemmap pages associated with each HugeTLB
* page is enabled, the head vmemmap page frame is reused and all of the tail
* vmemmap addresses map to the head vmemmap page frame (furture details can
* refer to the figure at the head of the mm/hugetlb_vmemmap.c). In other
@ -218,7 +218,7 @@ static __always_inline bool hugetlb_free_vmemmap_enabled(void)
*/
static __always_inline const struct page *page_fixed_fake_head(const struct page *page)
{
if (!hugetlb_free_vmemmap_enabled())
if (!hugetlb_optimize_vmemmap_enabled())
return page;
/*
@ -247,7 +247,7 @@ static inline const struct page *page_fixed_fake_head(const struct page *page)
return page;
}
static inline bool hugetlb_free_vmemmap_enabled(void)
static inline bool hugetlb_optimize_vmemmap_enabled(void)
{
return false;
}

10
mm/hugetlb_vmemmap.c
View File

@ -189,8 +189,8 @@
#define RESERVE_VMEMMAP_SIZE (RESERVE_VMEMMAP_NR << PAGE_SHIFT)
DEFINE_STATIC_KEY_MAYBE(CONFIG_HUGETLB_PAGE_FREE_VMEMMAP_DEFAULT_ON,
hugetlb_free_vmemmap_enabled_key);
EXPORT_SYMBOL(hugetlb_free_vmemmap_enabled_key);
hugetlb_optimize_vmemmap_key);
EXPORT_SYMBOL(hugetlb_optimize_vmemmap_key);
static int __init hugetlb_vmemmap_early_param(char *buf)
{
@ -204,9 +204,9 @@ static int __init hugetlb_vmemmap_early_param(char *buf)
return -EINVAL;
if (!strcmp(buf, "on"))
static_branch_enable(&hugetlb_free_vmemmap_enabled_key);
static_branch_enable(&hugetlb_optimize_vmemmap_key);
else if (!strcmp(buf, "off"))
static_branch_disable(&hugetlb_free_vmemmap_enabled_key);
static_branch_disable(&hugetlb_optimize_vmemmap_key);
else
return -EINVAL;
@ -282,7 +282,7 @@ void __init hugetlb_vmemmap_init(struct hstate *h)
BUILD_BUG_ON(__NR_USED_SUBPAGE >=
RESERVE_VMEMMAP_SIZE / sizeof(struct page));
if (!hugetlb_free_vmemmap_enabled())
if (!hugetlb_optimize_vmemmap_enabled())
return;
vmemmap_pages = (nr_pages * sizeof(struct page)) >> PAGE_SHIFT;

2
mm/memory_hotplug.c
View File

@ -1289,7 +1289,7 @@ bool mhp_supports_memmap_on_memory(unsigned long size)
* populate a single PMD.
*/
return memmap_on_memory &&
!hugetlb_free_vmemmap_enabled() &&
!hugetlb_optimize_vmemmap_enabled() &&
IS_ENABLED(CONFIG_MHP_MEMMAP_ON_MEMORY) &&
size == memory_block_size_bytes() &&
IS_ALIGNED(vmemmap_size, PMD_SIZE) &&