linux-kernel - Re: [PATCH v4 15/16] module: Move where we mark modules RO,X

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Date:   Thu, 24 Oct 2019 12:18:18 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org, mhiramat@...nel.org,
        bristot@...hat.com, jbaron@...mai.com,
        torvalds@...ux-foundation.org, tglx@...utronix.de,
        mingo@...nel.org, namit@...are.com, hpa@...or.com, luto@...nel.org,
        ard.biesheuvel@...aro.org, jpoimboe@...hat.com, jeyu@...nel.org
Subject: Re: [PATCH v4 15/16] module: Move where we mark modules RO,X

On Thu, Oct 24, 2019 at 12:16:09PM +0200, Peter Zijlstra wrote:
> +struct trace_event_fields {
> +	const char *type;
> +	union {
> +		struct {
> +			const char *name;
> +			const int  size;
> +			const int  align;
> +			const int  is_signed;
> +			const int  filter_type;

FWIW, I suspect we can do:

			unsigned char size;
			unsigned char align;
			unsigned char is_signed;
			unsigned char filter_type;

And save us some 8 bytes per entry (12 on 32bit).

> +		};
> +		int (*define_fields)(struct trace_event_call *);
> +	};
> +};