> Currently, nvdimm driver isn't RT compatible.
> nd_region_acquire_lane() disables preemption with get_cpu() which
> causes "scheduling while atomic" spews on RT, when using fio to test
> pmem as block device.
>
> In this change, we replace get_cpu/put_cpu with local_lock_cpu/
>
Hi Willy,
We're seeing a case where RocksDB hangs and becomes defunct when
trying to kill the process. v4.19 succeeds and v4.20 fails. Robert was
able to bisect this to commit b15cd800682f "dax: Convert page fault
handlers to XArray".
I see some direct usage of xa_index and wonder if there are
The original message was received at Fri, 8 Mar 2019 11:38:20 +0800
from lists.01.org [64.160.146.230]
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>>> MAIL From:"Bounced mail"
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> -Original Message-
> From: linux-kernel-ow...@vger.kernel.org [mailto:linux-kernel-
> ow...@vger.kernel.org] On Behalf Of Sebastian Andrzej Siewior
> Sent: Thursday, March 7, 2019 22:34
> To: Liu, Yongxin
> Cc: linux-ker...@vger.kernel.org; linux-rt-us...@vger.kernel.org;
>
On 2019-03-06 17:57:09 [+0800], Yongxin Liu wrote:
> In this change, we replace get_cpu/put_cpu with local_lock_cpu/
> local_unlock_cpu, and introduce per CPU variable "ndl_local_lock".
> Due to preemption on RT, this lock can avoid race condition for the
> same lane on the same CPU. When CPU
