linux-kernel - Re: [RFC 4/7] LTTng instrumentation kernel

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Message-ID: <473CDC30.9050405@us.ibm.com>
Date:	Thu, 15 Nov 2007 15:54:24 -0800
From:	Mike Mason <mmlnx@...ibm.com>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC 4/7] LTTng instrumentation kernel

snip
> 
> +void list_modules(void *call_data)
> +{
> +    /* Enumerate loaded modules */
> +    struct list_head    *i;
> +    struct module        *mod;
> +    unsigned long refcount = 0;
> +
> +    mutex_lock(&module_mutex);
> +    list_for_each(i, &modules) {
> +        mod = list_entry(i, struct module, list);
> +#ifdef CONFIG_MODULE_UNLOAD
> +        refcount = local_read(&mod->ref[0].count);
> +#endif
> +        __trace_mark(0, list_module, call_data,
> +                "name %s state %d refcount %lu",
> +                mod->name, mod->state, refcount);
> +    }
> +    mutex_unlock(&module_mutex);
> +}
> +EXPORT_SYMBOL_GPL(list_modules);
> +
> /* Given an address, look for it in the module exception tables. */
> const struct exception_table_entry *search_module_extables(unsigned long 
> addr)
> {

What is the purpose of list_modules() in this patch?  Seems outside the scope of the patches' intent.  I assume LTTng uses it for some purpose, but it's not required to use the markers added by the patch.

Also, if list_modules() remains, the 0 should be removed from "__trace_mark(0, ..." 

Mike Mason
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