On Mon, 5 April 2010 01:21:52 +0900, Minchan Kim wrote: > > > Until now, other file system don't need it. > Why do you need? To avoid deadlocks. You tell logfs to write out some locked page, logfs determines that it needs to run garbage collection first. Garbage collection can read any page. If it called find_or_create_page() for the locked page, you have a deadlock. I don't know how (or if) jffs2 and ubifs can avoid this particular scenario. The other filesystems lack garbage collection, so the problem does not exist. Jörn -- Joern's library part 5: http://www.faqs.org/faqs/compression-faq/part2/section-9.html -- 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>