linux-kernel - Re: [PATCH net-next] mctp: Reorder fields in 'struct mctp

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Message-ID: <c83bb6cf8f0d1ea8f5e3da690cda5e9742498a39.camel@codeconstruct.com.au>
Date:   Mon, 19 Jun 2023 22:06:59 +0800
From:   Jeremy Kerr <jk@...econstruct.com.au>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Matt Johnston <matt@...econstruct.com.au>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH net-next] mctp: Reorder fields in 'struct mctp_route'

Hi Christoph,

> Group some variables based on their sizes to reduce hole and avoid
> padding. On x86_64, this shrinks the size of 'struct mctp_route' from
> 72 to 64 bytes.
> 
> It saves a few bytes of memory and is more cache-line friendly.

The savings will be fairly minimal, but this doesn't affect readability
for the route struct. LGTM.

Acked-by: Jeremy Kerr <jk@...econstruct.com.au>

Thanks!


Jeremy