linux-kernel - Re: [PATCH 3/5] blk-mq: fix plugging in blk_sq_make

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Message-ID: <20150501171656.GC16920@lst.de>
Date:	Fri, 1 May 2015 19:16:56 +0200
From:	Christoph Hellwig <hch@....de>
To:	Shaohua Li <shli@...com>
Cc:	linux-kernel@...r.kernel.org, axboe@...com, jmoyer@...hat.com,
	hch@....de, neilb@...e.de
Subject: Re: [PATCH 3/5] blk-mq: fix plugging in blk_sq_make_request

> -	if (use_plug && !blk_queue_nomerges(q) &&
> +	if (likely(!is_flush_fua) && !blk_queue_nomerges(q) &&

Please don't sprinkle likely annotations for no go reason.  Especially
on metadata write heavy workloads (e.g. an NFS server) it might be very
likely.
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