On Tue, Jun 15, 2010 at 05:30:44PM +0100, Mel Gorman wrote: > After grepping through fs/, it was only xfs and btrfs that I saw were > specfically disabling writepage from reclaim context. ext4 doesn't specificly disable writeback from reclaim context, but in a rather convoluted way disabled basically all writeback through ->writepage. The only thing allowed is overwrites of already allocated blocks. In addition to that reiserfs also frefuses to write back pages from reclaim context if they require a transaction, which is the case if the file was written to through mmap. -- 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>