lkml.org 
[lkml]   [2017]   [Oct]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 1/2] mm, thp: introduce dedicated transparent huge page allocation interfaces
Date
From: Changbin Du <changbin.du@intel.com>

This patch introduced 4 new interfaces to allocate a prepared
transparent huge page.
- alloc_transhuge_page_vma
- alloc_transhuge_page_nodemask
- alloc_transhuge_page_node
- alloc_transhuge_page

The aim is to remove duplicated code and simplify transparent
huge page allocation. These are similar to alloc_hugepage_xxx
which are for hugetlbfs pages. This patch does below changes:
- define alloc_transhuge_page_xxx interfaces
- apply them to all existing code
- declare prep_transhuge_page as static since no others use it
- remove alloc_hugepage_vma definition since it no longer has users

Signed-off-by: Changbin Du <changbin.du@intel.com>
---
include/linux/gfp.h | 4 ----
include/linux/huge_mm.h | 13 ++++++++++++-
include/linux/migrate.h | 14 +++++---------
mm/huge_memory.c | 50 ++++++++++++++++++++++++++++++++++++++++++-------
mm/khugepaged.c | 11 ++---------
mm/mempolicy.c | 10 +++-------
mm/migrate.c | 12 ++++--------
mm/shmem.c | 6 ++----
8 files changed, 71 insertions(+), 49 deletions(-)

diff --git a/include/linux/gfp.h b/include/linux/gfp.h
index f780718..855c72e 100644
--- a/include/linux/gfp.h
+++ b/include/linux/gfp.h
@@ -507,15 +507,11 @@ alloc_pages(gfp_t gfp_mask, unsigned int order)
extern struct page *alloc_pages_vma(gfp_t gfp_mask, int order,
struct vm_area_struct *vma, unsigned long addr,
int node, bool hugepage);
-#define alloc_hugepage_vma(gfp_mask, vma, addr, order) \
- alloc_pages_vma(gfp_mask, order, vma, addr, numa_node_id(), true)
#else
#define alloc_pages(gfp_mask, order) \
alloc_pages_node(numa_node_id(), gfp_mask, order)
#define alloc_pages_vma(gfp_mask, order, vma, addr, node, false)\
alloc_pages(gfp_mask, order)
-#define alloc_hugepage_vma(gfp_mask, vma, addr, order) \
- alloc_pages(gfp_mask, order)
#endif
#define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0)
#define alloc_page_vma(gfp_mask, vma, addr) \
diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index 14bc21c..1dd2c33 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -130,9 +130,20 @@ extern unsigned long thp_get_unmapped_area(struct file *filp,
unsigned long addr, unsigned long len, unsigned long pgoff,
unsigned long flags);

-extern void prep_transhuge_page(struct page *page);
extern void free_transhuge_page(struct page *page);

+struct page *alloc_transhuge_page_vma(gfp_t gfp_mask,
+ struct vm_area_struct *vma, unsigned long addr);
+struct page *alloc_transhuge_page_nodemask(gfp_t gfp_mask,
+ int preferred_nid, nodemask_t *nmask);
+
+static inline struct page *alloc_transhuge_page_node(int nid, gfp_t gfp_mask)
+{
+ return alloc_transhuge_page_nodemask(gfp_mask, nid, NULL);
+}
+
+struct page *alloc_transhuge_page(gfp_t gfp_mask);
+
bool can_split_huge_page(struct page *page, int *pextra_pins);
int split_huge_page_to_list(struct page *page, struct list_head *list);
static inline int split_huge_page(struct page *page)
diff --git a/include/linux/migrate.h b/include/linux/migrate.h
index 643c7ae..70a00f3 100644
--- a/include/linux/migrate.h
+++ b/include/linux/migrate.h
@@ -42,19 +42,15 @@ static inline struct page *new_page_nodemask(struct page *page,
return alloc_huge_page_nodemask(page_hstate(compound_head(page)),
preferred_nid, nodemask);

- if (thp_migration_supported() && PageTransHuge(page)) {
- order = HPAGE_PMD_ORDER;
- gfp_mask |= GFP_TRANSHUGE;
- }
-
if (PageHighMem(page) || (zone_idx(page_zone(page)) == ZONE_MOVABLE))
gfp_mask |= __GFP_HIGHMEM;

- new_page = __alloc_pages_nodemask(gfp_mask, order,
+ if (thp_migration_supported() && PageTransHuge(page))
+ return alloc_transhuge_page_nodemask(gfp_mask | GFP_TRANSHUGE,
+ preferred_nid, nodemask);
+ else
+ return __alloc_pages_nodemask(gfp_mask, order,
preferred_nid, nodemask);
-
- if (new_page && PageTransHuge(page))
- prep_transhuge_page(new_page);

return new_page;
}
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 269b5df..e267488 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -490,7 +490,7 @@ static inline struct list_head *page_deferred_list(struct page *page)
return (struct list_head *)&page[2].mapping;
}

-void prep_transhuge_page(struct page *page)
+static void prep_transhuge_page(struct page *page)
{
/*
* we use page->mapping and page->indexlru in second tail page
@@ -501,6 +501,45 @@ void prep_transhuge_page(struct page *page)
set_compound_page_dtor(page, TRANSHUGE_PAGE_DTOR);
}

+struct page *alloc_transhuge_page_vma(gfp_t gfp_mask,
+ struct vm_area_struct *vma, unsigned long addr)
+{
+ struct page *page;
+
+ page = alloc_pages_vma(gfp_mask | __GFP_COMP, HPAGE_PMD_ORDER,
+ vma, addr, numa_node_id(), true);
+ if (unlikely(!page))
+ return NULL;
+ prep_transhuge_page(page);
+ return page;
+}
+
+struct page *alloc_transhuge_page_nodemask(gfp_t gfp_mask,
+ int preferred_nid, nodemask_t *nmask)
+{
+ struct page *page;
+
+ page = __alloc_pages_nodemask(gfp_mask | __GFP_COMP, HPAGE_PMD_ORDER,
+ preferred_nid, nmask);
+ if (unlikely(!page))
+ return NULL;
+ prep_transhuge_page(page);
+ return page;
+}
+
+struct page *alloc_transhuge_page(gfp_t gfp_mask)
+{
+ struct page *page;
+
+ VM_BUG_ON(!(gfp_mask & __GFP_COMP));
+
+ page = alloc_pages(gfp_mask | __GFP_COMP, HPAGE_PMD_ORDER);
+ if (unlikely(!page))
+ return NULL;
+ prep_transhuge_page(page);
+ return page;
+}
+
unsigned long __thp_get_unmapped_area(struct file *filp, unsigned long len,
loff_t off, unsigned long flags, unsigned long size)
{
@@ -719,12 +758,11 @@ int do_huge_pmd_anonymous_page(struct vm_fault *vmf)
return ret;
}
gfp = alloc_hugepage_direct_gfpmask(vma);
- page = alloc_hugepage_vma(gfp, vma, haddr, HPAGE_PMD_ORDER);
+ page = alloc_transhuge_page_vma(gfp, vma, haddr);
if (unlikely(!page)) {
count_vm_event(THP_FAULT_FALLBACK);
return VM_FAULT_FALLBACK;
}
- prep_transhuge_page(page);
return __do_huge_pmd_anonymous_page(vmf, page, gfp);
}

@@ -1288,13 +1326,11 @@ int do_huge_pmd_wp_page(struct vm_fault *vmf, pmd_t orig_pmd)
if (transparent_hugepage_enabled(vma) &&
!transparent_hugepage_debug_cow()) {
huge_gfp = alloc_hugepage_direct_gfpmask(vma);
- new_page = alloc_hugepage_vma(huge_gfp, vma, haddr, HPAGE_PMD_ORDER);
+ new_page = alloc_transhuge_page_vma(huge_gfp, vma, haddr);
} else
new_page = NULL;

- if (likely(new_page)) {
- prep_transhuge_page(new_page);
- } else {
+ if (unlikely(!new_page)) {
if (!page) {
split_huge_pmd(vma, vmf->pmd, vmf->address);
ret |= VM_FAULT_FALLBACK;
diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index c01f177..d17a694 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -745,14 +745,13 @@ khugepaged_alloc_page(struct page **hpage, gfp_t gfp, int node)
{
VM_BUG_ON_PAGE(*hpage, *hpage);

- *hpage = __alloc_pages_node(node, gfp, HPAGE_PMD_ORDER);
+ *hpage = alloc_transhuge_page_node(node, gfp);
if (unlikely(!*hpage)) {
count_vm_event(THP_COLLAPSE_ALLOC_FAILED);
*hpage = ERR_PTR(-ENOMEM);
return NULL;
}

- prep_transhuge_page(*hpage);
count_vm_event(THP_COLLAPSE_ALLOC);
return *hpage;
}
@@ -764,13 +763,7 @@ static int khugepaged_find_target_node(void)

static inline struct page *alloc_khugepaged_hugepage(void)
{
- struct page *page;
-
- page = alloc_pages(alloc_hugepage_khugepaged_gfpmask(),
- HPAGE_PMD_ORDER);
- if (page)
- prep_transhuge_page(page);
- return page;
+ return alloc_transhuge_page(alloc_hugepage_khugepaged_gfpmask());
}

static struct page *khugepaged_alloc_hugepage(bool *wait)
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index a2af6d5..aa24285 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -949,12 +949,10 @@ static struct page *new_node_page(struct page *page, unsigned long node, int **x
else if (thp_migration_supported() && PageTransHuge(page)) {
struct page *thp;

- thp = alloc_pages_node(node,
- (GFP_TRANSHUGE | __GFP_THISNODE),
- HPAGE_PMD_ORDER);
+ thp = alloc_transhuge_page_node(node,
+ (GFP_TRANSHUGE | __GFP_THISNODE));
if (!thp)
return NULL;
- prep_transhuge_page(thp);
return thp;
} else
return __alloc_pages_node(node, GFP_HIGHUSER_MOVABLE |
@@ -1125,11 +1123,9 @@ static struct page *new_page(struct page *page, unsigned long start, int **x)
} else if (thp_migration_supported() && PageTransHuge(page)) {
struct page *thp;

- thp = alloc_hugepage_vma(GFP_TRANSHUGE, vma, address,
- HPAGE_PMD_ORDER);
+ thp = alloc_transhuge_page_vma(GFP_TRANSHUGE, vma, address);
if (!thp)
return NULL;
- prep_transhuge_page(thp);
return thp;
}
/*
diff --git a/mm/migrate.c b/mm/migrate.c
index e00814c..7f0486f 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1472,12 +1472,10 @@ static struct page *new_page_node(struct page *p, unsigned long private,
else if (thp_migration_supported() && PageTransHuge(p)) {
struct page *thp;

- thp = alloc_pages_node(pm->node,
- (GFP_TRANSHUGE | __GFP_THISNODE) & ~__GFP_RECLAIM,
- HPAGE_PMD_ORDER);
+ thp = alloc_transhuge_page_node(pm->node,
+ (GFP_TRANSHUGE | __GFP_THISNODE) & ~__GFP_RECLAIM);
if (!thp)
return NULL;
- prep_transhuge_page(thp);
return thp;
} else
return __alloc_pages_node(pm->node,
@@ -2017,12 +2015,10 @@ int migrate_misplaced_transhuge_page(struct mm_struct *mm,
if (numamigrate_update_ratelimit(pgdat, HPAGE_PMD_NR))
goto out_dropref;

- new_page = alloc_pages_node(node,
- (GFP_TRANSHUGE_LIGHT | __GFP_THISNODE),
- HPAGE_PMD_ORDER);
+ new_page = alloc_transhuge_page_node(node,
+ (GFP_TRANSHUGE_LIGHT | __GFP_THISNODE));
if (!new_page)
goto out_fail;
- prep_transhuge_page(new_page);

isolated = numamigrate_isolate_page(pgdat, page);
if (!isolated) {
diff --git a/mm/shmem.c b/mm/shmem.c
index 07a1d22..52468f7 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -1444,11 +1444,9 @@ static struct page *shmem_alloc_hugepage(gfp_t gfp,
rcu_read_unlock();

shmem_pseudo_vma_init(&pvma, info, hindex);
- page = alloc_pages_vma(gfp | __GFP_COMP | __GFP_NORETRY | __GFP_NOWARN,
- HPAGE_PMD_ORDER, &pvma, 0, numa_node_id(), true);
+ gfp |= __GFP_COMP | __GFP_NORETRY | __GFP_NOWARN;
+ page = alloc_transhuge_page_vma(gfp, &pvma, 0);
shmem_pseudo_vma_destroy(&pvma);
- if (page)
- prep_transhuge_page(page);
return page;
}

--
2.7.4
\
 
 \ /
  Last update: 2017-10-16 11:27    [W:0.155 / U:1.404 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site