linux-kernel - Re: [PATCH v9 07/22] tracing: Add lock-free tracing

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Message-ID: <20150716180348.GI12596@twins.programming.kicks-ass.net>
Date:	Thu, 16 Jul 2015 20:03:48 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Tom Zanussi <tom.zanussi@...ux.intel.com>
Cc:	rostedt@...dmis.org, 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 v9 07/22] tracing: Add lock-free tracing_map

On Thu, Jul 16, 2015 at 12:22:40PM -0500, Tom Zanussi wrote:
> +	map->map = kcalloc(map->map_size, sizeof(struct tracing_map_entry),
> +			   GFP_KERNEL);

In a later email you state the max map size to be 128k, with a 16 byte
struct, that is 2m of memory for this allocation.

Isn't that a tad big for a kmalloc() ?
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