linux-kernel - Re: [PATCH] tracing: Dynamically allocate the per-elt hist_elt

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Date:   Fri, 03 Sep 2021 16:52:29 +0300
From:   Artem Bityutskiy <dedekind1@...il.com>
To:     Tom Zanussi <zanussi@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH] tracing: Dynamically allocate the per-elt hist_elt_data
 array

On Thu, 2021-09-02 at 15:57 -0500, Tom Zanussi wrote:
> Setting the hist_elt_data.field_var_str[] array unconditionally to a
> size of SYNTH_FIELD_MAX elements wastes space unnecessarily.  The
> actual number of elements needed can be calculated at run-time
> instead.
> 
> In most cases, this will save a lot of space since it's a per-elt
> array which isn't normally close to being full.  It also allows us to
> increase SYNTH_FIELD_MAX without worrying about even more wastage when
> we do that.
> 
> Signed-off-by: Tom Zanussi <zanussi@...nel.org>

Many thanks Tom! I've tested this one.

Tested-by: Artem Bityutskiy <artem.bityutskiy@...ux.intel.com>