On Nov 15, 2007 12:45 PM, Jacky(GuangXiang Lee) <gxli@xxxxxxxxxxx> wrote: > > to uniform flat virtual memory - whereby ONE pagetable is use to map > > the memory, and so every bytes that theoretically can be accessed have > > to have a physical byte to account for. > > Sorry, I must emphasize that the above statement applies to the PAGETABLE, but the phyical memory for the virtual can be much smaller. But in sparse mem(i suspect again) the indirection is slightly earlier - the physical memory for the pagetable NEED NOT be available, but will be constructed as per needed basis. Therefore, like what u mentioned - section_mem_map is used which consist of multiple of the normal mem_map. > > > Oh, well guess. With linux kernel, the physical memory is managed > initially by "sparse mode", which divides all avalable memory into > "sections".Each section contain typically 128M Bytes.So as to deal with > the probable holes in the entire physical memory map. > Is there any article/paper found about this? > Yes, I think u are right. Paper? May be the following (sorry, did not read it myself): lwn.net/Articles/134804/ lwn.net/Articles/128070/ lwn.net/Articles/144102/ lwn.net/Articles/128069/ -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
