On Sat, 16 Aug 2014 02:09:44 +0900 Akinobu Mita <akinobu.mita@xxxxxxxxx> wrote: > 2014-08-15 7:04 GMT+09:00 Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>: > > On Tue, 5 Aug 2014 23:38:31 +0900 Akinobu Mita <akinobu.mita@xxxxxxxxx> wrote: > > > >> This patchset implements readpages() operation for block device by > >> using mpage_readpages() which can create multipage BIOs instead of > >> BIOs for each page and reduce system CPU time consumption. > > > > Patchset is simple and straightforward enough. But who the > > heck cares about the performance of buffered reads from /dev/XXX? > > I tend to consider the block device as a baseline when I measure the > performance of the storage device. So I was a bit surprised when I saw > the performance of buffered reads from filesystem is better than the one > from block device. That is the reason about this patch for me. OK. The lack of readpages for blockdevs has been an outstanding oddity for a decade or longer - I think it's just that nobody was motivated to do it because the workload isn't important. But the implementation looks pretty simple so why not clean it up. I grabbed the patches. -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
