On 3/5/2012 6:35 PM, Zheng Liu wrote:
No, _RANDOM means that file system doesn't need to try its best to find a proper position to allocate some blocks for this file. Furthermore, currently random IOs seem that they are not obviously slower than sequential IOs in Flash/SSD device. For example, when users know a file that is accessed infrequently, they can put this file in a corner, such as in some discontinuously blocks. Then sequential blocks are reserved for the file that needs to be accessed frequently and users can obtain the better performance.
Then FADV_ALLOC_HOT_REGION and FADV_ALLOC_COLD_REGION are probably better terms. -- 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
