linux-kernel - Re: [PATCH 12/15] libnvdimm: enable iostat

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Message-ID: <CAPcyv4gHHYapu+sWoxmUsGx4Thf5SkA_0Hg9o2hniU1vuaDHyg@mail.gmail.com>
Date:	Fri, 19 Jun 2015 02:02:39 -0700
From:	Dan Williams <dan.j.williams@...el.com>
To:	Christoph Hellwig <hch@....de>
Cc:	Jens Axboe <axboe@...nel.dk>,
	"linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
	Boaz Harrosh <boaz@...xistor.com>,
	"Kani, Toshimitsu" <toshi.kani@...com>,
	Vishal Verma <vishal.l.verma@...ux.intel.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linux ACPI <linux-acpi@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH 12/15] libnvdimm: enable iostat

On Fri, Jun 19, 2015 at 1:34 AM, Christoph Hellwig <hch@....de> wrote:
> On Wed, Jun 17, 2015 at 07:55:51PM -0400, Dan Williams wrote:
>> This is disabled by default as the overhead is prohibitive, but if the
>> user takes the action to turn it on we'll oblige.
>
> If you care about users a compile time selection doesn't make sense,
> why not always build it but require an opt-in?

It's always built the Kconfig just selects the default initial state
of QUEUE_FLAG_IO_STAT.  They can always turn it on/off via block queue
sysfs.
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