ANDROID: mm: page_alloc: skip dump pages for freeable page
We have seen following dumps from alloc_contig_dump_pages.
05-20 20:04:41.847 1000 503 503 W page : 00000000691ab336 refcount:1 mapcount:0 mapping:0000000000000000 index:0x72aa2d7 pfn:0x9e912e
05-20 20:04:41.847 1000 503 503 W anon flags: 0x8000000000080004(uptodate|swapbacked)
05-20 20:04:41.847 1000 503 503 W raw : 8000000000080004 ffffffff25844b48 ffffffff25844bc8 ffffff89824e46c1
05-20 20:04:41.847 1000 503 503 W raw : 00000000072aa2d7 0000000000000000 00000001ffffffff 0000000000000000
05-20 20:04:41.847 1000 503 503 W : page dumped because: migration failure
05-20 20:04:41.847 1000 503 503 F : page_pinner info is not present (never set?)
05-20 20:04:41.847 1000 503 503 W page : 0000000099d95f64 refcount:1 mapcount:0 mapping:0000000000000000 index:0x72aa2d6 pfn:0x9e912d
05-20 20:04:41.847 1000 503 503 W anon flags: 0x8000000000080004(uptodate|swapbacked)
05-20 20:04:41.847 1000 503 503 W raw : 8000000000080004 ffffffff25844b08 ffffffff25844b88 ffffff89824e46c1
05-20 20:04:41.847 1000 503 503 W raw : 00000000072aa2d6 0000000000000000 00000001ffffffff 0000000000000000
05-20 20:04:41.847 1000 503 503 W : page dumped because: migration failure
05-20 20:04:41.847 1000 503 503 F : page_pinner info is not present (never set?)
05-20 20:04:41.847 1000 503 503 W page : 000000009af39924 refcount:1 mapcount:0 mapping:0000000000000000 index:0x72aa2d5 pfn:0x9e912c
05-20 20:04:41.847 1000 503 503 W anon flags: 0x8000000000080004(uptodate|swapbacked)
05-20 20:04:41.847 1000 503 503 W raw : 8000000000080004 ffffffff25844ac8 ffffffff25844b48 ffffff89824e46c1
05-20 20:04:41.847 1000 503 503 W raw : 00000000072aa2d5 0000000000000000 00000001ffffffff 0000000000000000
05-20 20:04:41.847 1000 503 503 W : page dumped because: migration failure
..
..
It means those pages would be temporarily pinnned during migration so the migration
failed but putback_movable_pages will end up freeing them since their page refcount
are 1 now. Thus, it doesn't deserve to dump them for the debugging aid.
Bug: 188908895
Signed-off-by: 
Minchan Kim <minchan@google.com>
Change-Id: I24092f0e53a3154443b9d6786413c4714ae853e8
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