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Date: Tue, 12 Jan 2010 06:59:59 +0100 From: Mike Galbraith <efault@....de> To: Andi Kleen <andi@...stfloor.org> Cc: Américo Wang <xiyou.wangcong@...il.com>, linux-kernel@...r.kernel.org Subject: Re: 2.6.33 pagemap endless read loop On Sun, 2010-01-10 at 13:37 +0100, Andi Kleen wrote: > > Are you sure > > I don't know if it's really endless, but it's doing a good emulation > of it if it's not. > > > > > On my 32bit machine, it runs for a long time, but finally exits. > > That was on 64bit. > > proc01 had accumulated several minutes of CPU time when I stopped it. > > > From the document of pagemap, it is the mapping of all the virtual pages > > of a process, on x86-32, it should be 4G/4K = 1024*1024 pages, also > > Only the mapped ones surely? > > Right now it looks like it dumps all the holes and that obviously > will never finish on 64bit which has 47bits of address space. Takes forever if you whack .pagemap_pte_hole too, just spends it's life in pagemap_pte_range() instead. start_vaddr:0x0 end_vaddr:0x7ffffffff000 Hm, zillion paces ain't a walk. -Mike -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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