RE: [discuss] Re: [patch 3/3] add x86-64 support for memory hot-add II

From: Tolentino, Matthew E
Date: Fri Dec 09 2005 - 13:36:55 EST


Andi Kleen <mailto:ak@xxxxxxx> wrote:
>> In general SRAT has a hotplug memory bit so it's possible
>> to predict how much memory there will be in advance. Since
>> the overhead of the kernel page tables should be very
>> low I would prefer if you just used instead.
>>
>> (i.e. instead of extending the kernel mapping preallocate
>> the direct mapping and just clear the P bits)
>>
>> That should be much simpler.
>
> Looking at it again - accessing SRAT currently relies on the
> direct mapping already. Untangling that would be possible,
> but require an bt_ioremap which would also add lots of code.
>
> Ok I retract that objection. I guess your way is better
> for now.

Thanks for considering this Andi.

> In addition to the __cpuinit comment
>
> +if (after_bootmem) spin_unlock(&init_mm.page_table_lock);
>
> Conditional locking is evil. spinlocking in the boot
> case should just work too I think.
>
> The EXPORTs should be probably EXPORT_SYMBOL_GPL.
>
> With these changes it would look ok for me.

Excellent points. Thanks for the review and suggestions. I'm
testing a revised patch now and will repost in a bit.

matt
-
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/