netdev - Re: [PATCH net-next v2] net: core: change bool members of struct net

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Message-ID: <35349fe9-94ac-e2d0-f02c-078c9fd58090@gmail.com>
Date:   Tue, 9 Oct 2018 09:20:10 -0600
From:   David Ahern <dsahern@...il.com>
To:     Heiner Kallweit <hkallweit1@...il.com>,
        David Miller <davem@...emloft.net>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next v2] net: core: change bool members of struct
 net_device to bitfield members

On 10/8/18 2:17 PM, Heiner Kallweit wrote:
> bool is good as parameter type or function return type, but if used
> for struct members it consumes more memory than needed.
> Changing the bool members of struct net_device to bitfield members
> allows to decrease the memory footprint of this struct.

What does pahole show for the size of the struct before and after? I
suspect you have not really changed the size and certainly not the
actual memory allocated.