tree 37c5386889669dd12899d28d2a38a25d1d9bcea2
parent 5ddfae16bddb12104fff63c36fb5901f1a3729fc
author Nick Piggin <nickpiggin@yahoo.com.au> 1141688578 -0800
committer Linus Torvalds <torvalds@g5.osdl.org> 1141699245 -0800

[PATCH] smaps: shared fix

The point of the smaps "shared" is to count the number of pages that are
mapped by more than one process, according to Mauricio Lin.  However, smaps
uses page_count for this, so it will return a false positive for every page
that is mapped by just that one process, which is also in pagecache or
swapcache.  There are false positive situations for anonymous pages not in
swapcache as well: - page reclaim, migration - get_user_pages (eg.
direct-io, ptrace)

Use page_mapcount instead, to count the number of mappings to the page.

Use vm_normal_page so that weird things like /dev/mem aren't counted either.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>