Re: [dm-devel] [PATCH] sched: make struct task_struct::state 32-bit

[Christoph Hellwig]

On Tue, Sep 03, 2019 at 12:05:58AM +0300, Alexey Dobriyan wrote:
> 32-bit accesses are shorter than 64-bit accesses on x86_64.
> Nothing uses 64-bitness of ->state.
> 
> Space savings are ~2KB on F30 kernel config.

I guess we'd save even more when moving from a volatile to
WRITE_ONCE/READ_ONCE..