linux-kernel - Re: [PATCH v3] libnvdimm, pmem: use REQ_FUA, REQ_FLUSH for nvdimm

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Message-ID: <1468439194.8908.55.camel@hpe.com>
Date:	Wed, 13 Jul 2016 19:46:56 +0000
From:	"Kani, Toshimitsu" <toshi.kani@....com>
To:	"dan.j.williams@...el.com" <dan.j.williams@...el.com>,
	"linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>
CC:	"hch@....de" <hch@....de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"ross.zwisler@...ux.intel.com" <ross.zwisler@...ux.intel.com>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH v3] libnvdimm, pmem: use REQ_FUA, REQ_FLUSH for
 nvdimm_flush()

On Tue, 2016-07-12 at 15:26 -0700, Dan Williams wrote:
> Given that nvdimm_flush() has higher overhead than wmb_pmem() (pointer
> chasing through nd_region), and that we otherwise assume a platform has
> ADR capability when flush hints are not present, move nvdimm_flush() to
> REQ_FLUSH context.
> 
> Note that we still arrange for nvdimm_flush() to be called even in the
> ADR case. We need at least once wmb() fence to push buffered writes in
> the cpu out to the ADR protected domain.
> 
> Cc: Toshi Kani <toshi.kani@....com>
> Cc: Ross Zwisler <ross.zwisler@...ux.intel.com>
> Signed-off-by: Dan Williams <dan.j.williams@...el.com>

This looks good to me.

Reviewed-by: Toshi Kani <toshi.kani@....com>

Thanks,
-Toshi