The patch titled
Subject: mm: swap: add comment for swap_vma_readahead
has been added to the -mm tree. Its filename is
mm-swap-add-comment-for-swap_vma_readahead.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-swap-add-comment-for-swap_vma_readahead.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-swap-add-comment-for-swap_vma_readahead.patch
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------------------------------------------------------
From: Yang Shi <yang.shi@xxxxxxxxxxxxxxxxx>
Subject: 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@xxxxxxxxxxxxxxxxx
Signed-off-by: Yang Shi <yang.shi@xxxxxxxxxxxxxxxxx>
Reviewed-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Huang Ying <ying.huang@xxxxxxxxx>
Cc: Tim Chen <tim.c.chen@xxxxxxxxx>
Cc: Minchan Kim <minchan@xxxxxxxxxx>
Cc: Daniel Jordan <daniel.m.jordan@xxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx
Cc: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
--- a/mm/swap_state.c~mm-swap-add-comment-for-swap_vma_readahead
+++ a/mm/swap_state.c
@@ -523,7 +523,7 @@ static unsigned long swapin_nr_pages(uns
* 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)
@@ -697,6 +697,20 @@ static void swap_ra_info(struct vm_fault
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)
{
_
Patches currently in -mm which might be from yang.shi@xxxxxxxxxxxxxxxxx are
mm-swap-check-if-swap-backing-device-is-congested-or-not.patch
mm-swap-add-comment-for-swap_vma_readahead.patch
