* [PATCH] mm: Simplify calling a compound page destructor
@ 2020-05-17 10:50 Matthew Wilcox
2020-05-18 2:28 ` Anshuman Khandual
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: Matthew Wilcox @ 2020-05-17 10:50 UTC (permalink / raw)
To: linux-mm, Kirill A . Shutemov, Andrew Morton; +Cc: Matthew Wilcox (Oracle)
From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
None of the three callers of get_compound_page_dtor() want to know
the value; they just want to call the function. Replace it with
destroy_compound_page() which calls the dtor for them.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
include/linux/mm.h | 4 ++--
mm/swap.c | 5 +----
mm/vmscan.c | 4 ++--
3 files changed, 5 insertions(+), 8 deletions(-)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 31ec312e8903..688558c57751 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -865,10 +865,10 @@ static inline void set_compound_page_dtor(struct page *page,
page[1].compound_dtor = compound_dtor;
}
-static inline compound_page_dtor *get_compound_page_dtor(struct page *page)
+static inline void destroy_compound_page(struct page *page)
{
VM_BUG_ON_PAGE(page[1].compound_dtor >= NR_COMPOUND_DTORS, page);
- return compound_page_dtors[page[1].compound_dtor];
+ compound_page_dtors[page[1].compound_dtor](page);
}
static inline unsigned int compound_order(struct page *page)
diff --git a/mm/swap.c b/mm/swap.c
index a37bd7b202ac..416fb89c86c1 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -83,8 +83,6 @@ static void __put_single_page(struct page *page)
static void __put_compound_page(struct page *page)
{
- compound_page_dtor *dtor;
-
/*
* __page_cache_release() is supposed to be called for thp, not for
* hugetlb. This is because hugetlb page does never have PageLRU set
@@ -93,8 +91,7 @@ static void __put_compound_page(struct page *page)
*/
if (!PageHuge(page))
__page_cache_release(page);
- dtor = get_compound_page_dtor(page);
- (*dtor)(page);
+ destroy_compound_page(page);
}
void __put_page(struct page *page)
diff --git a/mm/vmscan.c b/mm/vmscan.c
index cc555903a332..d96e18726751 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1442,7 +1442,7 @@ static unsigned int shrink_page_list(struct list_head *page_list,
* appear not as the counts should be low
*/
if (unlikely(PageTransHuge(page)))
- (*get_compound_page_dtor(page))(page);
+ destroy_compound_page(page);
else
list_add(&page->lru, &free_pages);
continue;
@@ -1870,7 +1870,7 @@ static unsigned noinline_for_stack move_pages_to_lru(struct lruvec *lruvec,
if (unlikely(PageCompound(page))) {
spin_unlock_irq(&pgdat->lru_lock);
- (*get_compound_page_dtor(page))(page);
+ destroy_compound_page(page);
spin_lock_irq(&pgdat->lru_lock);
} else
list_add(&page->lru, &pages_to_free);
--
2.26.2
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH] mm: Simplify calling a compound page destructor
2020-05-17 10:50 [PATCH] mm: Simplify calling a compound page destructor Matthew Wilcox
@ 2020-05-18 2:28 ` Anshuman Khandual
2020-05-18 10:00 ` Kirill A. Shutemov
2020-05-18 10:06 ` David Hildenbrand
2 siblings, 0 replies; 4+ messages in thread
From: Anshuman Khandual @ 2020-05-18 2:28 UTC (permalink / raw)
To: Matthew Wilcox, linux-mm, Kirill A . Shutemov, Andrew Morton
On 05/17/2020 04:20 PM, Matthew Wilcox wrote:
> From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
>
> None of the three callers of get_compound_page_dtor() want to know
> the value; they just want to call the function. Replace it with
> destroy_compound_page() which calls the dtor for them.
>
> Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Makes it simple and clean.
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] mm: Simplify calling a compound page destructor
2020-05-17 10:50 [PATCH] mm: Simplify calling a compound page destructor Matthew Wilcox
2020-05-18 2:28 ` Anshuman Khandual
@ 2020-05-18 10:00 ` Kirill A. Shutemov
2020-05-18 10:06 ` David Hildenbrand
2 siblings, 0 replies; 4+ messages in thread
From: Kirill A. Shutemov @ 2020-05-18 10:00 UTC (permalink / raw)
To: Matthew Wilcox; +Cc: linux-mm, Kirill A . Shutemov, Andrew Morton
On Sun, May 17, 2020 at 03:50:51AM -0700, Matthew Wilcox wrote:
> From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
>
> None of the three callers of get_compound_page_dtor() want to know
> the value; they just want to call the function. Replace it with
> destroy_compound_page() which calls the dtor for them.
>
> Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Ackedy-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
--
Kirill A. Shutemov
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] mm: Simplify calling a compound page destructor
2020-05-17 10:50 [PATCH] mm: Simplify calling a compound page destructor Matthew Wilcox
2020-05-18 2:28 ` Anshuman Khandual
2020-05-18 10:00 ` Kirill A. Shutemov
@ 2020-05-18 10:06 ` David Hildenbrand
2 siblings, 0 replies; 4+ messages in thread
From: David Hildenbrand @ 2020-05-18 10:06 UTC (permalink / raw)
To: Matthew Wilcox, linux-mm, Kirill A . Shutemov, Andrew Morton
On 17.05.20 12:50, Matthew Wilcox wrote:
> From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
>
> None of the three callers of get_compound_page_dtor() want to know
> the value; they just want to call the function. Replace it with
> destroy_compound_page() which calls the dtor for them.
>
> Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
> ---
> include/linux/mm.h | 4 ++--
> mm/swap.c | 5 +----
> mm/vmscan.c | 4 ++--
> 3 files changed, 5 insertions(+), 8 deletions(-)
>
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index 31ec312e8903..688558c57751 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -865,10 +865,10 @@ static inline void set_compound_page_dtor(struct page *page,
> page[1].compound_dtor = compound_dtor;
> }
>
> -static inline compound_page_dtor *get_compound_page_dtor(struct page *page)
> +static inline void destroy_compound_page(struct page *page)
> {
> VM_BUG_ON_PAGE(page[1].compound_dtor >= NR_COMPOUND_DTORS, page);
> - return compound_page_dtors[page[1].compound_dtor];
> + compound_page_dtors[page[1].compound_dtor](page);
> }
>
> static inline unsigned int compound_order(struct page *page)
> diff --git a/mm/swap.c b/mm/swap.c
> index a37bd7b202ac..416fb89c86c1 100644
> --- a/mm/swap.c
> +++ b/mm/swap.c
> @@ -83,8 +83,6 @@ static void __put_single_page(struct page *page)
>
> static void __put_compound_page(struct page *page)
> {
> - compound_page_dtor *dtor;
> -
> /*
> * __page_cache_release() is supposed to be called for thp, not for
> * hugetlb. This is because hugetlb page does never have PageLRU set
> @@ -93,8 +91,7 @@ static void __put_compound_page(struct page *page)
> */
> if (!PageHuge(page))
> __page_cache_release(page);
> - dtor = get_compound_page_dtor(page);
> - (*dtor)(page);
> + destroy_compound_page(page);
> }
>
> void __put_page(struct page *page)
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index cc555903a332..d96e18726751 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -1442,7 +1442,7 @@ static unsigned int shrink_page_list(struct list_head *page_list,
> * appear not as the counts should be low
> */
> if (unlikely(PageTransHuge(page)))
> - (*get_compound_page_dtor(page))(page);
> + destroy_compound_page(page);
> else
> list_add(&page->lru, &free_pages);
> continue;
> @@ -1870,7 +1870,7 @@ static unsigned noinline_for_stack move_pages_to_lru(struct lruvec *lruvec,
>
> if (unlikely(PageCompound(page))) {
> spin_unlock_irq(&pgdat->lru_lock);
> - (*get_compound_page_dtor(page))(page);
> + destroy_compound_page(page);
> spin_lock_irq(&pgdat->lru_lock);
> } else
> list_add(&page->lru, &pages_to_free);
>
Reviewed-by: David Hildenbrand <david@redhat.com>
--
Thanks,
David / dhildenb
^ permalink raw reply [flat|nested] 4+ messages in thread
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2020-05-17 10:50 [PATCH] mm: Simplify calling a compound page destructor Matthew Wilcox
2020-05-18 2:28 ` Anshuman Khandual
2020-05-18 10:00 ` Kirill A. Shutemov
2020-05-18 10:06 ` David Hildenbrand
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