On Sat, Nov 19, 2011 at 11:03, Christoph Hellwig <hch@xxxxxxxxxxxxx> wrote: > On Fri, Nov 18, 2011 at 06:39:50PM +0800, Cong Wang wrote: >> It seems that systemd needs tmpfs to support fallocate, >> see http://lkml.org/lkml/2011/10/20/275. This patch adds >> fallocate support to tmpfs. > > What for exactly? Please explain why preallocating on tmpfs would > make any sense. To be able to safely use mmap(), regarding SIGBUS, on files on the /dev/shm filesystem. The glibc fallback loop for -ENOSYS on fallocate is just ugly. Kay -- 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/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href