[PATCH v3 2/8] mm/hwpoison: don't need to hold compound lock for hugetlbfs page
v1 -> v2:
* drop compound_trans_order completely
compound lock is introduced by commit e9da73d67("thp: compound_lock."),
it is used to serialize put_page against __split_huge_page_refcount().
In addition, transparent hugepages will be splitted in hwpoison handler
and just one subpage will be poisoned. There is unnecessary to hold
compound lock for hugetlbfs page. This patch replace compound_trans_order
by compond_order in the place where the page is hugetlbfs page.
Reviewed-by: Naoya Horiguchi
Signed-off-by: Wanpeng Li
---
include/linux/mm.h | 14 --
mm/memory-failure.c | 12 ++--
2 files changed, 6 insertions(+), 20 deletions(-)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index f022460..1745a2a 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -489,20 +489,6 @@ static inline int compound_order(struct page *page)
return (unsigned long)page[1].lru.prev;
}
-static inline int compound_trans_order(struct page *page)
-{
- int order;
- unsigned long flags;
-
- if (!PageHead(page))
- return 0;
-
- flags = compound_lock_irqsave(page);
- order = compound_order(page);
- compound_unlock_irqrestore(page, flags);
- return order;
-}
-
static inline void set_compound_order(struct page *page, unsigned long order)
{
page[1].lru.prev = (void *)order;
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 2c13aa7..efa6bd7 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -206,7 +206,7 @@ static int kill_proc(struct task_struct *t, unsigned long
addr, int trapno,
#ifdef __ARCH_SI_TRAPNO
si.si_trapno = trapno;
#endif
- si.si_addr_lsb = compound_trans_order(compound_head(page)) + PAGE_SHIFT;
+ si.si_addr_lsb = compound_order(compound_head(page)) + PAGE_SHIFT;
if ((flags & MF_ACTION_REQUIRED) && t == current) {
si.si_code = BUS_MCEERR_AR;
@@ -983,7 +983,7 @@ static int hwpoison_user_mappings(struct page *p, unsigned
long pfn,
static void set_page_hwpoison_huge_page(struct page *hpage)
{
int i;
- int nr_pages = 1 << compound_trans_order(hpage);
+ int nr_pages = 1 << compound_order(hpage);
for (i = 0; i < nr_pages; i++)
SetPageHWPoison(hpage + i);
}
@@ -991,7 +991,7 @@ static void set_page_hwpoison_huge_page(struct page *hpage)
static void clear_page_hwpoison_huge_page(struct page *hpage)
{
int i;
- int nr_pages = 1 << compound_trans_order(hpage);
+ int nr_pages = 1 << compound_order(hpage);
for (i = 0; i < nr_pages; i++)
ClearPageHWPoison(hpage + i);
}
@@ -1336,7 +1336,7 @@ int unpoison_memory(unsigned long pfn)
return 0;
}
- nr_pages = 1 << compound_trans_order(page);
+ nr_pages = 1 << compound_order(page);
if (!get_page_unless_zero(page)) {
/*
@@ -1491,7 +1491,7 @@ static int soft_offline_huge_page(struct page *page, int
flags)
} else {
set_page_hwpoison_huge_page(hpage);
dequeue_hwpoisoned_huge_page(hpage);
- atomic_long_add(1 << compound_trans_order(hpage),
+ atomic_long_add(1 << compound_order(hpage),
_poisoned_pages);
}
return ret;
@@ -1551,7 +1551,7 @@ int soft_offline_page(struct page *page, int flags)
if (PageHuge(page)) {
set_page_hwpoison_huge_page(hpage);
dequeue_hwpoisoned_huge_page(hpage);
- atomic_long_add(1 << compound_trans_order(hpage),
+ atomic_long_add(1 << compound_order(hpage),
_poisoned_pages);
} else {
SetPageHWPoison(page);
--
1.7.5.4
--
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[PATCH v3 2/8] mm/hwpoison: don't need to hold compound lock for hugetlbfs page
v1 - v2:
* drop compound_trans_order completely
compound lock is introduced by commit e9da73d67(thp: compound_lock.),
it is used to serialize put_page against __split_huge_page_refcount().
In addition, transparent hugepages will be splitted in hwpoison handler
and just one subpage will be poisoned. There is unnecessary to hold
compound lock for hugetlbfs page. This patch replace compound_trans_order
by compond_order in the place where the page is hugetlbfs page.
Reviewed-by: Naoya Horiguchi n-horigu...@ah.jp.nec.com
Signed-off-by: Wanpeng Li liw...@linux.vnet.ibm.com
---
include/linux/mm.h | 14 --
mm/memory-failure.c | 12 ++--
2 files changed, 6 insertions(+), 20 deletions(-)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index f022460..1745a2a 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -489,20 +489,6 @@ static inline int compound_order(struct page *page)
return (unsigned long)page[1].lru.prev;
}
-static inline int compound_trans_order(struct page *page)
-{
- int order;
- unsigned long flags;
-
- if (!PageHead(page))
- return 0;
-
- flags = compound_lock_irqsave(page);
- order = compound_order(page);
- compound_unlock_irqrestore(page, flags);
- return order;
-}
-
static inline void set_compound_order(struct page *page, unsigned long order)
{
page[1].lru.prev = (void *)order;
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 2c13aa7..efa6bd7 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -206,7 +206,7 @@ static int kill_proc(struct task_struct *t, unsigned long
addr, int trapno,
#ifdef __ARCH_SI_TRAPNO
si.si_trapno = trapno;
#endif
- si.si_addr_lsb = compound_trans_order(compound_head(page)) + PAGE_SHIFT;
+ si.si_addr_lsb = compound_order(compound_head(page)) + PAGE_SHIFT;
if ((flags MF_ACTION_REQUIRED) t == current) {
si.si_code = BUS_MCEERR_AR;
@@ -983,7 +983,7 @@ static int hwpoison_user_mappings(struct page *p, unsigned
long pfn,
static void set_page_hwpoison_huge_page(struct page *hpage)
{
int i;
- int nr_pages = 1 compound_trans_order(hpage);
+ int nr_pages = 1 compound_order(hpage);
for (i = 0; i nr_pages; i++)
SetPageHWPoison(hpage + i);
}
@@ -991,7 +991,7 @@ static void set_page_hwpoison_huge_page(struct page *hpage)
static void clear_page_hwpoison_huge_page(struct page *hpage)
{
int i;
- int nr_pages = 1 compound_trans_order(hpage);
+ int nr_pages = 1 compound_order(hpage);
for (i = 0; i nr_pages; i++)
ClearPageHWPoison(hpage + i);
}
@@ -1336,7 +1336,7 @@ int unpoison_memory(unsigned long pfn)
return 0;
}
- nr_pages = 1 compound_trans_order(page);
+ nr_pages = 1 compound_order(page);
if (!get_page_unless_zero(page)) {
/*
@@ -1491,7 +1491,7 @@ static int soft_offline_huge_page(struct page *page, int
flags)
} else {
set_page_hwpoison_huge_page(hpage);
dequeue_hwpoisoned_huge_page(hpage);
- atomic_long_add(1 compound_trans_order(hpage),
+ atomic_long_add(1 compound_order(hpage),
num_poisoned_pages);
}
return ret;
@@ -1551,7 +1551,7 @@ int soft_offline_page(struct page *page, int flags)
if (PageHuge(page)) {
set_page_hwpoison_huge_page(hpage);
dequeue_hwpoisoned_huge_page(hpage);
- atomic_long_add(1 compound_trans_order(hpage),
+ atomic_long_add(1 compound_order(hpage),
num_poisoned_pages);
} else {
SetPageHWPoison(page);
--
1.7.5.4
--
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