linux-kernel - Re: [RFC-v2 11/12] iscsi-target: Add misc utility and debug logic

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Date:	Tue, 15 Mar 2011 15:59:56 -0700
From:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>
To:	Christoph Hellwig <hch@....de>
Cc:	linux-scsi <linux-scsi@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	Mike Christie <michaelc@...wisc.edu>,
	Hannes Reinecke <hare@...e.de>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	Boaz Harrosh <bharrosh@...asas.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Douglas Gilbert <dgilbert@...erlog.com>
Subject: Re: [RFC-v2 11/12] iscsi-target: Add misc utility and debug logic

On Tue, 2011-03-15 at 11:27 +0100, Christoph Hellwig wrote:
> On Mon, Mar 14, 2011 at 04:57:08AM -0700, Nicholas A. Bellinger wrote:
> > +++ b/drivers/target/iscsi/iscsi_debug.h
> > @@ -0,0 +1,113 @@
> > +#ifndef ISCSI_DEBUG_H
> > +#define ISCSI_DEBUG_H
> > +
> > +/*
> > + * Debugging Support
> > + */
> > +
> > +#define TRACE_DEBUG	0x00000001	/* Verbose debugging */
> > +#define TRACE_SCSI	0x00000002	/* Stuff related to SCSI Mid-layer */
> 
> Please use trace events for this kind of debugging.
> 

<nod>, will have a closer look at Documentation/trace/events.txt

> > +	spin_lock_bh(&conn->cmd_lock);
> > +	list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
> > +	spin_unlock_bh(&conn->cmd_lock);
> > +
> > +	atomic_inc(&conn->active_cmds);
> 
> Seems like this counter is always maintained together with the list,
> so it should be a non-atomic type under cmd_lock.
> 

This counter (was) purely information and unused beyond the atomic_inc()
+ atomic_dec().  Removing now..

--nab

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