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[RFC,1/6] Fix khugepaged's request size in collapse_file() [ver #2]

Message ID 159906146405.663183.8327943081419924909.stgit@warthog.procyon.org.uk (mailing list archive)
State New, archived
Headers show
Series mm: Make more use of readahead_control [ver #2] | expand

Commit Message

David Howells Sept. 2, 2020, 3:44 p.m. UTC
collapse_file() in khugepaged passes PAGE_SIZE as the number of pages to be
read ahead to page_cache_sync_readahead().  It seems this was expressed as a
number of bytes rather than a number of pages.

Fix it to use the number of pages to the end of the window instead.

Fixes: 99cb0dbd47a1 ("mm,thp: add read-only THP support for (non-shmem) FS")
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Song Liu <songliubraving@fb.com>
Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>

 mm/khugepaged.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index 6d199c353281..f2d243077b74 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -1706,7 +1706,7 @@  static void collapse_file(struct mm_struct *mm,
 				page_cache_sync_readahead(mapping, &file->f_ra,
 							  file, index,
-							  PAGE_SIZE);
+							  end - index);
 				/* drain pagevecs to help isolate_lru_page() */
 				page = find_lock_page(mapping, index);