On Sun, Aug 10, 2014 at 11:31:20PM -0700, Darrick J. Wong wrote: > > Hmm, I'll try that, though I'm almost tempted just to issue io_cache_readahead > calls directly from the for loop. The only reason I'm using the list here at > all is to handle the case of reading multiple groups in a flexbg (pass5 RA). In that case you could just use an accumulator for each of the block and inode bitmaps, and so long as the next group's block and inode bitmaps are contiguous with the previous one, you can bump a counter. Once you reach a discontiguous bitmap block, you can issue a single readahead request for N blocks starting at block B. That way you only issue a single syscall, instead of one for every single block, and you don't have the overhead involved with storing the list of blocks and then sorting them. - Ted -- 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
