On Fri, Jun 11, 2010 at 10:43:31AM -0700, Andrew Morton wrote: > Of course, but making a change like that in the current VM will cause a > large number of dirty pages to get refiled, so the impact of this > change on some workloads could be quite bad. Note that ext4, btrfs and xfs all error out on ->writepage from reclaim context. That is both kswapd and direct reclaim because there is no way to distinguish between the two. Things seem to work fine with these filesystems, so the issue can't be _that_ bad. Of course reducing this to just error out from direct reclaim, and fixing them VM to better cope with it is even better. -- 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/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>