linux-kernel - Re: [PATCH 1/8] scsi: Drop struct Scsi_Host->host

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Message-ID: <20100917072022.GB2644@gargoyle.ger.corp.intel.com>
Date:	Fri, 17 Sep 2010 09:20:22 +0200
From:	Andi Kleen <ak@...ux.intel.com>
To:	James Bottomley <James.Bottomley@...e.de>
Cc:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>,
	linux-scsi <linux-scsi@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Vasu Dev <vasu.dev@...ux.intel.com>,
	Tim Chen <tim.c.chen@...ux.intel.com>,
	Matthew Wilcox <willy@...ux.intel.com>,
	Mike Christie <michaelc@...wisc.edu>,
	James Smart <james.smart@...lex.com>,
	Andrew Vasquez <andrew.vasquez@...gic.com>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	Hannes Reinecke <hare@...e.de>,
	Joe Eykholt <jeykholt@...co.com>,
	Christoph Hellwig <hch@....de>
Subject: Re: [PATCH 1/8] scsi: Drop struct Scsi_Host->host_lock around
	SHT->queuecommand()

> So at least from where I stand, my object is to reduce the number of
> times we take and release the lock, which this doesn't do.  As I said
> before: we need to figure out the rest, which likely includes an atomic
> for the serial number (which is almost unused).  I think the check

If it's unused it should be removed, make optional.
Atomics are a scalability problem too and not much cheaper than spinlocks.

-Andi
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