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[BUGFIX/IMPROVEMENT,0/3] bfq: one fix and two important improvements for throughput

Message ID 20180914142309.6789-1-paolo.valente@linaro.org
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Series bfq: one fix and two important improvements for throughput | expand

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Paolo Valente Sept. 14, 2018, 2:23 p.m. UTC 
Hi Jens,
the second and third patch in this series provide two important
improvements in bfq's ability to boost throughput with random I/O. The
benefits of the second patch concern I/O control, and are described in
detail in this LWN article [1] (and briefly in the commit message
itself). The benefits of the other patch should be
straightforward. Finally, the first patch fixes an I/O-control bug,
found while making the second patch.

These patches modify somehow core operations of bfq, so, before
submitting them, I have tested them a lot, and have had them tested by
other people too. In particular, during these months, they have been
tested in systems ranging from PCs to development platforms.

Thanks,
Paolo

[1] https://lwn.net/Articles/763603/

Paolo Valente (3):
  block, bfq: correctly charge and reset entity service in all cases
  block, bfq: inject other-queue I/O into seeky idle queues on NCQ flash
  blok, bfq: do not plug I/O if all queues are weight-raised

 block/bfq-iosched.c | 78 +++++++++++++++++++++++++++++++++++++++++++++++------
 block/bfq-iosched.h | 26 ++++++++++++++++++
 block/bfq-wf2q.c    | 13 ++++++---
 3 files changed, 106 insertions(+), 11 deletions(-)

--
2.16.1

Comments

Jens Axboe Sept. 14, 2018, 7:06 p.m. UTC | #1 
On 9/14/18 8:23 AM, Paolo Valente wrote:
> Hi Jens,

> the second and third patch in this series provide two important

> improvements in bfq's ability to boost throughput with random I/O. The

> benefits of the second patch concern I/O control, and are described in

> detail in this LWN article [1] (and briefly in the commit message

> itself). The benefits of the other patch should be

> straightforward. Finally, the first patch fixes an I/O-control bug,

> found while making the second patch.

> 

> These patches modify somehow core operations of bfq, so, before

> submitting them, I have tested them a lot, and have had them tested by

> other people too. In particular, during these months, they have been

> tested in systems ranging from PCs to development platforms.


Applied for 4.20, thanks Paolo.

-- 
Jens Axboe