linux-kernel - Re: what is spinlock depth

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Message-ID: <4D472446.2040501@gmail.com>
Date:	Mon, 31 Jan 2011 22:06:14 +0100
From:	Jiri Slaby <jirislaby@...il.com>
To:	Sri Ram Vemulpali <sri.ram.gmu06@...il.com>
CC:	Kernel-newbies <kernelnewbies@...linux.org>,
	linux-kernel-mail <linux-kernel@...r.kernel.org>
Subject: Re: what is spinlock depth

On 01/31/2011 09:27 PM, Sri Ram Vemulpali wrote:
> Hi all,
> 
> I am reading spinlock code and looking at struct raw_spinlock. I found
> struct lockdep_map as member.
> which is defined as
> 
> struct lockdep_map {
>        struct lock_class_key           *key;
>        struct lock_class               *class_cache[NR_LOCKDEP_CACHING_CLASSES];
>        const char                      *name;
> #ifdef CONFIG_LOCK_STAT
>        int                             cpu;
>       unsigned long                   ip;
> #endif
> };
> 
> Can anyone help me explain, how this struct helps the spinlock. Why do
> we need lockdepth.

It's not dep-th, but dep-endency. It's a debugging technique to
dynamically check for locking correctness. See more details in
Documentation/lockdep-design.txt.

-- 
js
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