I completely agree with you. I was just trying to clarify Xianghua'sstatement "last 128 MB is used for HIGHMEM". I got the feeling that he thought that last 128MB can be used for vmalloc, IO and for HIGHMEM. So, i was clarifying that last 128MB is not "used for highmem" but it is used to support highmem.(among many other things). That was what i intended.
On Tue, Apr 6, 2010 at 7:09 PM, H. Peter Anvin <h...@zytor.com> wrote: > 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. > >
