Re: remove __read_mostly?

[Christoph Lameter]

On Sun, 25 Jun 2006, Arjan van de Ven wrote:

> On Sun, 2006-06-25 at 11:57 -0700, Andrew Morton wrote:
> > I'm thinking we should remove __read_mostly.
> > 
> > Because if we use this everywhere where it's supposed to be used, we end up
> > with .bss and .data 100% populated with write-often variables, packed
> > closely together.  The cachelines will really flying around.
> 
> 
> one thing we could/should do is have a "written during boot only"
> section; which we then can mark read only as well :)

To replicate an IRIX idea:

We could have section with variables that can only be modified by special 
command. F.e.

enable_write_to_most_read_section()
<change variable>
disable_write_to_most_read_section()


This section could be a per cpu section that would be replicated
to all nodes on the system on disable_write_to_most_read_section().
That would mean that critical read only data would be node local.

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/