linux-kernel - Re: [PATCH v2 15/17] libnvdimm: Set numa

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Date:	Thu, 25 Jun 2015 16:55:10 -0600
From:	Toshi Kani <toshi.kani@...com>
To:	Dan Williams <dan.j.williams@...el.com>
Cc:	"axboe@...nel.dk" <axboe@...nel.dk>,
	"linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"mingo@...nel.org" <mingo@...nel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	"hch@....de" <hch@....de>
Subject: Re: [PATCH v2 15/17] libnvdimm: Set numa_node to NVDIMM devices

On Thu, 2015-06-25 at 15:34 -0700, Dan Williams wrote:
> On Thu, Jun 25, 2015 at 3:11 PM, Toshi Kani <toshi.kani@...com> wrote:
> > On Thu, 2015-06-25 at 15:00 -0700, Dan Williams wrote:
> > Yes, I see no problem with bound BTTs and their device files.  So, how
> > do we bind BTT with this new version?
> >
> 
> # cd /sys/bus/nd/devices
> # uuidgen > btt6/uuid
> # echo 4096 > btt6/sector_size
> # echo namespace6.0 > btt6/namespace
> # echo namespace6.0 > ../drivers/nd_pmem/unbind
> # echo btt6 > ../drivers/nd_pmem/bind
> 
> After reboot, when the system sees namespace6.0 again it will notice
> the btt instance and attach bttX instead.  The net effect is that now
> you'll only ever have /dev/pmem6 or /dev/pmem6s, never both at the
> same time that was a side effect of the stacking approach.
> 
> I'll post the patch that updates libndctl and the unit tests shortly

Maybe I am missing something, but I am getting errors on my system.  (I
used btt0 since there is no btt6.)

# cat bind.sh
set -x
cd /sys/bus/nd/devices
uuidgen > btt0/uuid
echo 4096 > btt0/sector_size
echo namespace0.0 > btt0/namespace
echo namespace0.0 > ../drivers/nd_pmem/unbind
echo btt0 > ../drivers/nd_pmem/bind

# sh bind.sh
+ cd /sys/bus/nd/devices
+ uuidgen
+ echo 4096
+ echo namespace0.0
bind.sh: line 6: echo: write error: Device or resource busy
+ echo namespace0.0
bind.sh: line 7: echo: write error: No such device
+ echo btt0
bind.sh: line 8: echo: write error: No such device

# dmesg
 :
[12513.839162] nd btt0: uuid_store: result: 0 wrote:
b32cd195-9aae-4c54-a5ac-49adb50a8a98
[12513.880286] nd btt0: sector_size_store: result: 0 wrote: 4096
[12513.909494] nd btt0: namespace0.0 already claimed
[12513.933364] nd btt0: namespace_store: result: -16 wrote: namespace0.0
[12513.966808]  ndbus0: nd_pmem.probe(btt0) = -19

Thanks,
-Toshi

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