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mm/vmscan: filter empty page_list at the beginning
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>
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parent
f19a27e399
commit
1ae65e2749
10
mm/vmscan.c
10
mm/vmscan.c
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@ -2568,9 +2568,12 @@ unsigned long reclaim_pages(struct list_head *page_list)
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struct page *page;
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unsigned int noreclaim_flag;
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if (list_empty(page_list))
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return nr_reclaimed;
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noreclaim_flag = memalloc_noreclaim_save();
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while (!list_empty(page_list)) {
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do {
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page = lru_to_page(page_list);
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if (nid == NUMA_NO_NODE)
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nid = page_to_nid(page);
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@ -2583,10 +2586,9 @@ unsigned long reclaim_pages(struct list_head *page_list)
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nr_reclaimed += reclaim_page_list(&node_page_list, NODE_DATA(nid));
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nid = NUMA_NO_NODE;
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}
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} while (!list_empty(page_list));
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if (!list_empty(&node_page_list))
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nr_reclaimed += reclaim_page_list(&node_page_list, NODE_DATA(nid));
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nr_reclaimed += reclaim_page_list(&node_page_list, NODE_DATA(nid));
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memalloc_noreclaim_restore(noreclaim_flag);
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