Re: ZONE_PADDING wastes 4 bytes of the new cacheline

[Andrew Morton]

Nick Piggin <nickpiggin@xxxxxxxxxxxx> wrote:
>
> >  #if defined(CONFIG_SMP)
>  >  struct zone_padding {
>  > -	int x;
>  >  } ____cacheline_maxaligned_in_smp;
>  >  #define ZONE_PADDING(name)	struct zone_padding name;
>  >  #else
> 
>  Perhaps to keep old compilers working? Not sure.

gcc-2.95 is OK with it.

Stock 2.6.9:

	sizeof(struct zone) = 1920

With Andrea's patch:

	sizeof(struct zone) = 1536

With ZONE_PADDING removed:

	sizeof(struct zone) = 1408
	
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