linux-kernel - Re: [PATCH 07/14] scsi: convert host_busy to atomic

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Message-ID: <yq1ppgykpn1.fsf@sermon.lab.mkp.net>
Date:	Tue, 22 Jul 2014 00:01:54 -0400
From:	"Martin K. Petersen" <martin.petersen@...cle.com>
To:	Christoph Hellwig <hch@....de>
Cc:	James Bottomley <James.Bottomley@...senPartnership.com>,
	linux-scsi@...r.kernel.org, Jens Axboe <axboe@...nel.dk>,
	Bart Van Assche <bvanassche@...ionio.com>,
	Mike Christie <michaelc@...wisc.edu>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Robert Elliott <Elliott@...com>, Webb Scales <webbnh@...com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 07/14] scsi: convert host_busy to atomic_t

>>>>> "Christoph" == Christoph Hellwig <hch@....de> writes:

Christoph> Avoid taking the host-wide host_lock to check the per-host
Christoph> queue limit.  Instead we do an atomic_inc_return early on to
Christoph> grab our slot in the queue, and if nessecary decrement it
                                              necessary

Reviewed-by: Martin K. Petersen <martin.petersen@...cle.com>

-- 
Martin K. Petersen	Oracle Linux Engineering
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