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mm/vmscan: filter empty page_list at the beginning

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node_page_list would always be !empty on finishing the loop, except
page_list is empty.

Let's handle empty page_list before doing any real work including touching
PF_MEMALLOC flag.

Link: https://lkml.kernel.org/r/20220429014426.29223-1-richard.weiyang@gmail.com
Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Minchan Kim <minchan@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Wei Yang 2022-05-12 20:23:00 -07:00 committed by Andrew Morton
parent f19a27e399
commit 1ae65e2749
1 changed files with 6 additions and 4 deletions
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10
mm/vmscan.c
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@ -2568,9 +2568,12 @@ unsigned long reclaim_pages(struct list_head *page_list)
struct page *page; struct page *page;
unsigned int noreclaim_flag; unsigned int noreclaim_flag;
if (list_empty(page_list))
return nr_reclaimed;
noreclaim_flag = memalloc_noreclaim_save(); noreclaim_flag = memalloc_noreclaim_save();
while (!list_empty(page_list)) { do {
page = lru_to_page(page_list); page = lru_to_page(page_list);
if (nid == NUMA_NO_NODE) if (nid == NUMA_NO_NODE)
nid = page_to_nid(page); nid = page_to_nid(page);
@ -2583,10 +2586,9 @@ unsigned long reclaim_pages(struct list_head *page_list)
nr_reclaimed += reclaim_page_list(&node_page_list, NODE_DATA(nid)); nr_reclaimed += reclaim_page_list(&node_page_list, NODE_DATA(nid));
nid = NUMA_NO_NODE; nid = NUMA_NO_NODE;
} } while (!list_empty(page_list));
if (!list_empty(&node_page_list)) nr_reclaimed += reclaim_page_list(&node_page_list, NODE_DATA(nid));
nr_reclaimed += reclaim_page_list(&node_page_list, NODE_DATA(nid));
memalloc_noreclaim_restore(noreclaim_flag); memalloc_noreclaim_restore(noreclaim_flag);