linux-kernel - Re: [PATCH v4 2/9] liblockdep: Wrap kernel/lockdep.c to allow usage from userspace

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Message-ID: <20130522091718.GE18810@twins.programming.kicks-ass.net>
Date:	Wed, 22 May 2013 11:17:18 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Sasha Levin <sasha.levin@...cle.com>
Cc:	torvalds@...ux-foundation.org, mingo@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 2/9] liblockdep: Wrap kernel/lockdep.c to allow usage
 from userspace

On Wed, May 15, 2013 at 11:15:34PM -0400, Sasha Levin wrote:
> --- /dev/null
> +++ b/tools/lib/lockdep/uinclude/linux/lockdep.h
> @@ -0,0 +1,55 @@
> +#ifndef _LIBLOCKDEP_LOCKDEP_H_
> +#define _LIBLOCKDEP_LOCKDEP_H_
> +
> +#include <sys/prctl.h>
> +#include <sys/syscall.h>
> +#include <string.h>
> +#include <limits.h>
> +#include <linux/utsname.h>
> +
> +
> +#define MAX_LOCK_DEPTH 2000UL
> +
> +#include "../../../include/linux/lockdep.h"
> +
> +struct task_struct {
> +	u64 curr_chain_key;
> +	int lockdep_depth;
> +	unsigned int lockdep_recursion;
> +	struct held_lock held_locks[MAX_LOCK_DEPTH];
> +	gfp_t lockdep_reclaim_gfp;
> +	int pid;
> +	char comm[17];
> +};

Whee that's a totally awesome MAX_LOCK_DEPTH.. :-)

Should we not also extend the other static allocations, or have you not
yet ran into them? I would suspect that without proper classes we're
bound to run out of class and link storage quite quickly.


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