On Mon, Nov 29, 2010 at 07:18:17AM +0100, Guillem Jover wrote: > > What's going on here? sync_file_range() is a Linux specific system > > call that has been around for a while. It allows program to control > > when writeback happens in a very low-level fashion. The first set of > > sync_file_range() system calls causes the system to start writing back > > each file once it has finished being extracted. It doesn't actually > > wait for the write to finish; it just starts the writeback. > > Hmm, ok so what about posix_fadvise(fd, 0, 0, POSIX_FADV_DONTNEED) > instead, skimming over the kernel source seems to indicate it might > end up doing more or less the same thing but in a portable way?
On the other hand, there is no guarantee that other kernels do the same, nor that Linux will keep doing it in the future. Using sync_file_range and possibly the corresponding BSD syscall seems a better solution. (and apparently the assumption with fadvise doesn't work with xfs) Mike -- To UNSUBSCRIBE, email to debian-boot-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/20101130090755.ga8...@glandium.org
