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Message-ID: <4BBBE976.1000603@zytor.com> Date: Tue, 06 Apr 2010 19:09:58 -0700 From: "H. Peter Anvin" <hpa@...or.com> To: Venkatram Tummala <venkatram867@...il.com> CC: Xianghua Xiao <xiaoxianghua@...il.com>, Youngwhan Song <breadncup@...il.com>, Joel Fernandes <agnel.joel@...il.com>, Frank Hu <frank.hu.2001@...il.com>, hayfeng Lee <teklife.kernel@...il.com>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "linux-kernel@...kernel.org" <linux-kernel@...kernel.org>, "kernelnewbies@...linux.org" <kernelnewbies@...linux.org> Subject: Re: why choose 896MB to the start point of ZONE_HIGHMEM On 04/06/2010 07:04 PM, Venkatram Tummala wrote: > Hey Xiao, > > last 128MB is not used for highmem. last 128MB is used for data > structures(page tables etc.) to support highmem . Highmem is not > something which is "INSIDE" Kernel's Virtual Address space. Highmem > refers to a region of "Physical memory" which can be mapped into > kernel's virtual address space through page tables. > > Regards, > Venkatram Tummala > Not quite. The vmalloc region is for *anything which is dynamically mapped*, which includes I/O, vmalloc, and HIGHMEM (kmap). -hpa -- H. Peter Anvin, Intel Open Source Technology Center I work for Intel. I don't speak on their behalf. -- 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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