linux-kernel - Re: [PATCH v2 RESENT] blk: optimization for classic polling

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Message-ID: <620867e2-2a0c-5c32-10c6-7cc5268ac944@kernel.dk>
Date:   Tue, 13 Feb 2018 07:42:20 -0700
From:   Jens Axboe <axboe@...nel.dk>
To:     Nitesh Shetty <nj.shetty@...sung.com>, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     linux-nvme@...ts.infradead.org, joshi.k@...sung.com
Subject: Re: [PATCH v2 RESENT] blk: optimization for classic polling

On 2/13/18 11:56 AM, Nitesh Shetty wrote:
> This removes the dependency on interrupts to wake up task. Set task
> state as TASK_RUNNING, if need_resched() returns true,
> while polling for IO completion.
> Earlier, polling task used to sleep, relying on interrupt to wake it up.
> This made some IO take very long when interrupt-coalescing is enabled in
> NVMe.

__set_current_state() should suffice here.

-- 
Jens Axboe