linux-kernel - Re: [PATCH 2/9] IB: add a proper completion queue abstraction

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Message-ID: <564852F2.5080602@dev.mellanox.co.il>
Date:	Sun, 15 Nov 2015 11:40:02 +0200
From:	Sagi Grimberg <sagig@....mellanox.co.il>
To:	Christoph Hellwig <hch@....de>, linux-rdma@...r.kernel.org
Cc:	bart.vanassche@...disk.com, axboe@...com,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/9] IB: add a proper completion queue abstraction



> +/**
> + * ib_process_direct_cq - process a CQ in caller context
> + * @cq:		CQ to process
> + *
> + * This function is used to process all outstanding CQ entries on a
> + * %IB_POLL_DIRECT CQ.  It does not offload CQ processing to a different
> + * context and does not ask from completion interrupts from the HCA.
> + */
> +void ib_process_cq_direct(struct ib_cq *cq)
> +{
> +	WARN_ON_ONCE(cq->poll_ctx != IB_POLL_DIRECT);
> +
> +	__ib_process_cq(cq, INT_MAX);
> +}

I doubt INT_MAX is useful as a budget in any use-case. it can easily
hog the CPU. If the consumer is given access to poll a CQ, it must be
able to provide some way to budget it. Why not expose a budget argument
to the consumer?
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