linux-kernel - Re: [PATCH v7 06/10] trace: Add lock-free tracing

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Message-ID: <20150612165203.51ad8d2b@gandalf.local.home>
Date:	Fri, 12 Jun 2015 16:52:03 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Tom Zanussi <tom.zanussi@...ux.intel.com>
Cc:	daniel.wagner@...-carit.de, masami.hiramatsu.pt@...achi.com,
	namhyung@...nel.org, josh@...htriplett.org, andi@...stfloor.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 06/10] trace: Add lock-free tracing_map

On Mon,  8 Jun 2015 16:32:05 -0500
Tom Zanussi <tom.zanussi@...ux.intel.com> wrote:

> +/**
> + * tracing_map_init - Allocate and clear a map's tracing_map_elts
> + * @map: The tracing_map to initialize
> + *
> + * Creates and sets up a map to contain a max_size number of entries
> + * equal to a size of 2 ** map_bits.  Before using, the map fields
> + * should be added to the map with tracing_map_add_key_field() and
> + * tracing_map_add_key_field().  tracing_map_init() should then be

Hmm, it's suppose to be added with tracing_map_add_key_field() twice?

-- Steve

> + * called to allocate the array of tracing_map_elts, in order to avoid
> + * allocating anything in the map insertion path.  The user-specified
> + * map_size reflect the max number of entries requested by the user -
> + * internally we double that in order to keep the table sparse and
> + * keep collisions manageable.
> + *
> + * See tracing_map.h for a description of tracing_map_ops.
> + *
> + * Return: the tracing_map * if successful, ERR_PTR if not.
> + */
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