* mm, thp: fix mapped pages avoiding unevictable list on mlock
@ 2013-04-05 7:45 Simon Jeons
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From: Simon Jeons @ 2013-04-05 7:45 UTC (permalink / raw)
To: David Rientjes; +Cc: Linux Memory Management List
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Hi David,
http://marc.info/?l=linux-mm&m=134810397323814&w=2
#define MAP_SIZE (4 << 30) /* 4GB */
void *ptr = mmap(NULL, MAP_SIZE, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
mlock(ptr, MAP_SIZE);
$ grep -E "Unevictable|Inactive\(anon" /proc/meminfo
Inactive(anon): 6304 kB
Unevictable: 4213924 kB
These pages are allocated in mlock path(gup), correct? If the answer is yes,follow_page also will not set these pages unevictable, is it? Then how you get these pages unevictable?
munlock(ptr, MAP_SIZE);
Inactive(anon): 4186252 kB
Unevictable: 19652 kB
mlock(ptr, MAP_SIZE);
Inactive(anon): 4198556 kB
Unevictable: 21684 kB
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2013-04-05 7:45 mm, thp: fix mapped pages avoiding unevictable list on mlock Simon Jeons
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