On Thu, Aug 19, 2010 at 09:04:21PM +0530, naveen yadav wrote: > > Dear all, > > I build MIPS 32 with sparsemem support to take care of holes in > physical memory, this conserve memory but put overhead to speed > because of pointer redirection in pfn_to_page(). > > To prevent this conversion I tried to use > CONFIG_SPARSEMEM_VMEMMAP_ENABLE on MIPS 32 but kernel build fails > becauase most of the supported functions related to vmemmap are > supported for 64 bit architectures only. > > I wish to compare memory and speed result with / without > CONFIG_SPARSEMEM_VMEMMAP_ENABLE in MIPS 32. I need your comment in it > ? We use sparse memory and submitted a patch some while ago to add support, but it died for lack of interest. The patch was relative to a kernel from several released ago; I don't know whether it would apply to the tip. I can see if I track it down. -- David VL
