On Fri 08-03-13 20:22:19, Phillip Susi wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > On 03/08/2013 10:00 AM, Howard Chu wrote: > > Yes, that's what I was thinking. I added a > > posix_madvise(..POSIX_MADV_RANDOM) but that had no effect on the > > test. > > Yep, that's because it isn't implemented. Why do you think so? AFAICS it is implemented by setting VM_RAND_READ flag in the VMA and do_async_mmap_readahead() and do_sync_mmap_readahead() check for the flag and don't do anything if it is set... Honza -- Jan Kara <jack@xxxxxxx> SUSE Labs, CR -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>