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Message-Id: <20171227121507.4280-1-paolo.valente@linaro.org> Date: Wed, 27 Dec 2017 13:15:06 +0100 From: Paolo Valente <paolo.valente@...aro.org> To: Jens Axboe <axboe@...nel.dk> Cc: linux-block@...r.kernel.org, linux-kernel@...r.kernel.org, ulf.hansson@...aro.org, broonie@...nel.org, linus.walleij@...aro.org, bfq-iosched@...glegroups.com, Paolo Valente <paolo.valente@...aro.org> Subject: [PATCH IMPROVEMENT/BUGFIX 0/1] block, bfq: address starvation caused by tag consumption Hi Jens, all, here's the patch I anticipated in my last email. It addresses (serious) starvation problems caused by request-tag exhaustion, as explained in more detail in the commit message. I started from the solution in the function kyber_limit_depth, but then I had to define more articulate limits, to counter starvation also in cases not covered in kyber_limit_depth. If this solution proves to be effective, I'm willing to port it somehow to the other schedulers. Thanks, Paolo Paolo Valente (1): block, bfq: limit tags for writes and async I/O block/bfq-iosched.c | 77 +++++++++++++++++++++++++++++++++++++++++++++++++++++ block/bfq-iosched.h | 12 +++++++++ 2 files changed, 89 insertions(+) -- 2.15.1
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