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mm: swap: unify cluster-based and vma-based swap readahead

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This patch makes do_swap_page() not need to be aware of two different
swap readahead algorithms.  Just unify cluster-based and vma-based
readahead function call.

Link: http://lkml.kernel.org/r/1509520520-32367-3-git-send-email-minchan@kernel.org
Link: http://lkml.kernel.org/r/20180220085249.151400-3-minchan@kernel.org
Signed-off-by: Minchan Kim <minchan@kernel.org>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Hugh Dickins <hughd@google.com>
Cc: Huang Ying <ying.huang@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Minchan Kim
2018-04-05 16:23:42 -07:00
committed by Linus Torvalds
parent eaf649ebc3
commit e9e9b7ecee
4 changed files with 53 additions and 38 deletions
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27
include/linux/swap.h
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@@ -400,7 +400,6 @@ int generic_swapfile_activate(struct swap_info_struct *, struct file *,
#define SWAP_ADDRESS_SPACE_SHIFT 14
#define SWAP_ADDRESS_SPACE_PAGES (1 << SWAP_ADDRESS_SPACE_SHIFT)
extern struct address_space *swapper_spaces[];
extern bool swap_vma_readahead;
#define swap_address_space(entry) \
(&swapper_spaces[swp_type(entry)][swp_offset(entry) \
>> SWAP_ADDRESS_SPACE_SHIFT])
@@ -422,10 +421,10 @@ extern struct page *read_swap_cache_async(swp_entry_t, gfp_t,
extern struct page *__read_swap_cache_async(swp_entry_t, gfp_t,
struct vm_area_struct *vma, unsigned long addr,
bool *new_page_allocated);
extern struct page *swapin_readahead(swp_entry_t, gfp_t,
struct vm_area_struct *vma, unsigned long addr);
extern struct page *do_swap_page_readahead(swp_entry_t fentry, gfp_t gfp_mask,
struct vm_fault *vmf);
extern struct page *swap_cluster_readahead(swp_entry_t entry, gfp_t flag,
struct vm_fault *vmf);
extern struct page *swapin_readahead(swp_entry_t entry, gfp_t flag,
struct vm_fault *vmf);
/* linux/mm/swapfile.c */
extern atomic_long_t nr_swap_pages;
@@ -433,11 +432,6 @@ extern long total_swap_pages;
extern atomic_t nr_rotate_swap;
extern bool has_usable_swap(void);
static inline bool swap_use_vma_readahead(void)
{
return READ_ONCE(swap_vma_readahead) && !atomic_read(&nr_rotate_swap);
}
/* Swap 50% full? Release swapcache more aggressively.. */
static inline bool vm_swap_full(void)
{
@@ -533,19 +527,14 @@ static inline void put_swap_page(struct page *page, swp_entry_t swp)
{
}
static inline struct page *swapin_readahead(swp_entry_t swp, gfp_t gfp_mask,
struct vm_area_struct *vma, unsigned long addr)
static inline struct page *swap_cluster_readahead(swp_entry_t entry,
gfp_t gfp_mask, struct vm_fault *vmf)
{
return NULL;
}
static inline bool swap_use_vma_readahead(void)
{
return false;
}
static inline struct page *do_swap_page_readahead(swp_entry_t fentry,
gfp_t gfp_mask, struct vm_fault *vmf)
static inline struct page *swapin_readahead(swp_entry_t swp, gfp_t gfp_mask,
struct vm_fault *vmf)
{
return NULL;
}