On Fri, 28 Feb 2014 14:18:50 -0800 Ning Qu <[email protected]> wrote:
> This is a follow-up patch for "mm: map few pages around fault address if they > are in page cache" > > We use the generic filemap_map_pages as ->map_pages in shmem/tmpfs. > Please cc Hugh on shmem/tmpfs things > > ========================================================================= > Below is just some simple experiment numbers from this patch, let me know if > you would like more: > > Tested on Xeon machine with 64GiB of RAM, using the current default fault > order 4. > > Sequential access 8GiB file > Baseline with-patch > 1 thread > minor fault 205 101 Confused. Sequential access of an 8G file should generate 2,000,000 minor faults, not 205. And with FAULT_AROUND_ORDER=4, that should come down to 2,000,000/16 minor faults when using faultaround? > time, seconds 7.94 7.82 > > Random access 8GiB file > Baseline with-patch > 1 thread > minor fault 724 623 > time, seconds 9.75 9.84 > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
