[patch 057/181] proc: optimise smaps for shmem entries

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From: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>
Subject: proc: optimise smaps for shmem entries

Avoid bumping the refcount on pages when we're only interested in the
swap entries.

Link: https://lkml.kernel.org/r/20200910183318.20139-5-willy@xxxxxxxxxxxxx
Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Acked-by: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Alexey Dobriyan <adobriyan@xxxxxxxxx>
Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Huang Ying <ying.huang@xxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Jani Nikula <jani.nikula@xxxxxxxxxxxxxxx>
Cc: Matthew Auld <matthew.auld@xxxxxxxxx>
Cc: William Kucharski <william.kucharski@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 fs/proc/task_mmu.c |    8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

--- a/fs/proc/task_mmu.c~proc-optimise-smaps-for-shmem-entries
+++ a/fs/proc/task_mmu.c
@@ -520,16 +520,10 @@ static void smaps_pte_entry(pte_t *pte,
 			page = device_private_entry_to_page(swpent);
 	} else if (unlikely(IS_ENABLED(CONFIG_SHMEM) && mss->check_shmem_swap
 							&& pte_none(*pte))) {
-		page = find_get_entry(vma->vm_file->f_mapping,
+		page = xa_load(&vma->vm_file->f_mapping->i_pages,
 						linear_page_index(vma, addr));
-		if (!page)
-			return;
-
 		if (xa_is_value(page))
 			mss->swap += PAGE_SIZE;
-		else
-			put_page(page);
-
 		return;
 	}
 
_



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