Re: [PATCH 04/21] mm: zap_pte_range dont dirty anon

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Sun, 25 Sep 2005, Andrew Morton wrote:
> 
> 	mmap(MAP_ANONYMOUS|MAP_SHARED)
> 	fork()
> 	swapout
> 	swapin
> 	swapoff
> 
> Now we have two mm's sharing a clean, non-cowable, non-swapcache anonymous
> page, no?

No, MAP_ANONYMOUS|MAP_SHARED gives you a tmpfs object via shmem_zero_setup:
all those pages are shared file pages, not PageAnon at all.

Hugh
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]
  Powered by Linux