Hi, these two patches improve throughput-boosting logic in two aspects. The first patch refactors the parts of the device-idling logic, related to throughput boosting, that are still scattered across the source file bfq-iosched.c. The patch concetrates all the logic in one function. The second patch fixes/improves device idling for flash-based devices that have no internal queueing of I/O requests. The contribution in the first patch has been triggered by that in the second patch: finding the change made by the second patch has been more difficult than it had to be, because the logic that decides whether to idle the device is scattered across three functions. The second patch provides a significant throghput boost, for random I/O with flash-based non-queueing devices. For example, on a HiKey board, throughput increases by up to 125%, growing, e.g., from 6.9MB/s to 15.6MB/s with two or three random readers in parallel. Thanks, Paolo Paolo Valente (2): block,bfq: refactor device-idling logic block, bfq: boost throughput with flash-based non-queueing devices block/bfq-iosched.c | 144 ++++++++++++++++++++++++++++------------------------ block/bfq-iosched.h | 12 ++--- 2 files changed, 85 insertions(+), 71 deletions(-) -- 2.10.0
