On Mon, 29 Nov 2010 12:32:11 -0800 Jeremy Fitzhardinge <jeremy@xxxxxxxx> wrote: > When unmapping a region in the vmalloc space, clear the ptes immediately. > There's no point in deferring this because there's no amortization > benefit. > > The TLBs are left dirty, and they are flushed lazily to amortize the > cost of the IPIs. > > This specific motivation for this patch is a regression since 2.6.36 when > using NFS under Xen, triggered by the NFS client's use of vm_map_ram() > introduced in 56e4ebf877b6043c289bda32a5a7385b80c17dee. XFS also uses > vm_map_ram() and could cause similar problems. > Do we have any quantitative info on that regression? The patch fixed it, I assume? -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom policy in Canada: sign http://dissolvethecrtc.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>