On Mon, Mar 05, 2012 at 08:50:29PM +0800, Zheng Liu wrote: > Hi list, > > Block allocation is a key component of file system. Every file systems try to > improve the performance with optimizing the block allocation of a file. But no > matter what file system does, it just guesses what the user expects. Thus, it > is not very accurate. fadvise(2) provides a method to let the user to give a > hint to file system. However, until now, only few flags are provided. So we > can provide more flags to tell file system how to allocate the blocks for a > file. > > For example: > we can add these flags into fadvise(2): > FADV_ALLOC_READ_SEQ fallocate() > FADV_ALLOC_READ_RANDOM Allocation can't be optimised as the read pattern cannot be defined. > FADV_ALLOC_WRITE_ONCE fallocate() > FADV_ALLOC_WRITE_APPEND chattr +a Cheers, Dave. -- Dave Chinner david@xxxxxxxxxxxxx -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
