On Thu, 2010-08-19 at 16:06 -0700, David VomLehn wrote: > 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. I keep thinking we should have a git tree for highmem 'experimental' changes. Some of us are shipping highmem, discontiguous memory systems in high volume. --jfraser
