Re: [PATCHv2 RESEND 0/9] target: Save memory on unused se_dev_entrys and se_luns

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On Thu, 2014-05-01 at 10:53 -0700, Andy Grover wrote:
> On 04/24/2014 10:34 PM, Christoph Hellwig wrote:
> > On Wed, Apr 23, 2014 at 03:36:27PM -0700, Andy Grover wrote:
> >> Does this set look ok, or any other changes needed? Just haven't heard
> >> anything.
> >
> > the series looks reasonable to me, at least for the points I previously
> > comment on.
> >
> > Cheers,
> > 	Christoph
> >
> > p.s. it helps to cc me if you want a quick reply.
> 
> Cool, thanks. Will do in the future.
> 
> Nick, thoughts?
> 

So now that target code (plus Sagi's patches) is finally working
correctly with active I/O shutdown with iser + friends, I'm not exactly
crazy about introducing a bunch of changes that potentially break long
standing assumptions about how se_lun + se_dev_entry pointers are
accessed.

That said, I'd much rather see proper percpu refcounting for
se_dev_entry introduced ahead of these types of memory space related
optimizations.

--nab





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