Re: [PATCH 1/2] ext3 percpu counter fixes to suppport for more than 2**31 ext3 free blocks counter

[Mingming Cao <cmm@us.ibm.com>]

On Mon, 2006-04-24 at 11:26 -0700, Ravikiran G Thirumalai wrote:
> On Mon, Apr 24, 2006 at 10:48:32AM -0700, Mingming Cao wrote:
> > On Fri, 2006-04-21 at 15:09 -0700, Andrew Morton wrote:
> > > >
> > > I think it would be saner to explicitly specify the size of the field. 
> > > That means using s32 and s64 throughout this code.
> > > 
> > 
> > Agree. Will use s64 in this code. As s32 has the same issue with what we
> > have(unsigned long) on 32 bit machine today: it is not enough for ext3
> > to support more than 2**31 free blocks, and also obviously not enough
> > for 64 bit ext3 that Laurent is working on.
> 
> I think Andrew's suggestion was to change global counter to s64 and local
> counter to s32.  That way we avoid allocating a 64 bit local counter on 64
> bit systems when we could do with a 32 bit counter. (although there is no
> real space savings with current alloc_percpu ;), but hopefully that will
> change in the future)
> 

Oh, I see. :-) I shall have the updated patch soon.

Mingming