Re: [PATCH] x86_64: Auto size the per cpu area.

From: Eric W. Biederman
Date: Tue Aug 08 2006 - 02:44:21 EST

Andi Kleen <ak@xxxxxxx> writes:

> On Tuesday 08 August 2006 07:47, Eric W. Biederman wrote:
>> Now for a completely different but trivial approach.
>> I just boot tested it with 255 CPUS and everything worked.
>> Currently everything (except module data) we place in
>> the per cpu area we know about at compile time. So
>> instead of allocating a fixed size for the per_cpu area
>> allocate the number of bytes we need plus a fixed constant
>> for to be used for modules.
>> It isn't perfect but it is much less of a pain to
>> work with than what we are doing now.
> Yes makes sense.
> However not that particular patch - i already changed that
> code in my tree because I needed really early per cpu for something and
> i had switched to using a static array for cpu0's cpudata.
> I will modify it to work like your proposal.

Sounds good to me.

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at