• Wu Fengguang's avatar
    proc: export more page flags in /proc/kpageflags · 17797549
    Wu Fengguang authored
    Export all page flags faithfully in /proc/kpageflags.
    
    	11. KPF_MMAP		(pseudo flag) memory mapped page
    	12. KPF_ANON		(pseudo flag) memory mapped page (anonymous)
    	13. KPF_SWAPCACHE	page is in swap cache
    	14. KPF_SWAPBACKED	page is swap/RAM backed
    	15. KPF_COMPOUND_HEAD	(*)
    	16. KPF_COMPOUND_TAIL	(*)
    	17. KPF_HUGE		hugeTLB pages
    	18. KPF_UNEVICTABLE	page is in the unevictable LRU list
    	19. KPF_HWPOISON(TBD)	hardware detected corruption
    	20. KPF_NOPAGE		(pseudo flag) no page frame at the address
    	32-39.			more obscure flags for kernel developers
    
    	(*) For compound pages, exporting _both_ head/tail info enables
    	    users to tell where a compound page starts/ends, and its order.
    
    The accompanying page-types tool will handle the details like decoupling
    overloaded flags and hiding obscure flags to normal users.
    
    Thanks to KOSAKI and Andi for their valuable recommendations!
    Signed-off-by: default avatarWu Fengguang <fengguang.wu@intel.com>
    Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
    Cc: Andi Kleen <andi@firstfloor.org>
    Cc: Matt Mackall <mpm@selenic.com>
    Cc: Alexey Dobriyan <adobriyan@gmail.com>
    Cc: Ingo Molnar <mingo@elte.hu>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    17797549
page.c 5.54 KB