Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit e9f59873 authored by Yang Shi's avatar Yang Shi Committed by Linus Torvalds
Browse files

mm: swap: add comment for swap_vma_readahead 

swap_vma_readahead()'s comment is missing, just add it.

Link: http://lkml.kernel.org/r/1546543673-108536-2-git-send-email-yang.shi@linux.alibaba.com


Signed-off-by: default avatarYang Shi <yang.shi@linux.alibaba.com>
Reviewed-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Cc: Huang Ying <ying.huang@intel.com>
Cc: Tim Chen <tim.c.chen@intel.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Daniel Jordan <daniel.m.jordan@oracle.com>
Cc: Hugh Dickins <hughd@google.com
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 8fd2e0b5

mm/swap_state.c

+15 −1
Original line number Diff line number Diff line
@@ -523,7 +523,7 @@ static unsigned long swapin_nr_pages(unsigned long offset) 
 * This has been extended to use the NUMA policies from the mm triggering

 * the readahead.

 *

 * Caller must hold down_read on the vma->vm_mm if vmf->vma is not NULL.

 * Caller must hold read mmap_sem if vmf->vma is not NULL.

 */

struct page *swap_cluster_readahead(swp_entry_t entry, gfp_t gfp_mask,

				struct vm_fault *vmf)
@@ -698,6 +698,20 @@ static void swap_ra_info(struct vm_fault *vmf, 
	pte_unmap(orig_pte);

}



/**

 * swap_vma_readahead - swap in pages in hope we need them soon

 * @entry: swap entry of this memory

 * @gfp_mask: memory allocation flags

 * @vmf: fault information

 *

 * Returns the struct page for entry and addr, after queueing swapin.

 *

 * Primitive swap readahead code. We simply read in a few pages whoes

 * virtual addresses are around the fault address in the same vma.

 *

 * Caller must hold read mmap_sem if vmf->vma is not NULL.

 *

 */

static struct page *swap_vma_readahead(swp_entry_t fentry, gfp_t gfp_mask,

				       struct vm_fault *vmf)

{