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From: Chaitanya Kulkarni <Chaitanya.Kulkarni@wdc.com>
To: "Darrick J. Wong" <darrick.wong@oracle.com>,
	Christoph Hellwig <hch@infradead.org>
Cc: Eric Sandeen <sandeen@sandeen.net>,
	Pavel Reichl <preichl@redhat.com>,
	"linux-xfs@vger.kernel.org" <linux-xfs@vger.kernel.org>
Subject: Re: [PATCH v3] mkfs: Break block discard into chunks of 2 GB
Date: Tue, 10 Dec 2019 07:33:03 +0000
Message-ID: <BYAPR04MB5749AF1A90B082FBD8662284865B0@BYAPR04MB5749.namprd04.prod.outlook.com> (raw)
In-Reply-To: <20191204174216.GS7335@magnolia>

On 12/04/2019 09:42 AM, Darrick J. Wong wrote:
> On Wed, Dec 04, 2019 at 09:26:52AM -0800, Christoph Hellwig wrote:
>> On Wed, Dec 04, 2019 at 10:24:32AM -0600, Eric Sandeen wrote:
>>> It'd be great to fix this universally in the kernel but it seems like
>>> that patch is in discussion for now, and TBH I don't see any real
>>> drawbacks to looping in mkfs - it would also solve the problem on any
>>> old kernel w/o the block layer change.
>>
>> The problem is that we throw out efficiency for no good reason.
>
> True...
>
>>> I'd propose that we go ahead w/ the mkfs change, and if/when the kernel
>>> handles this better, and it's reasonable to expect that we're running
>
> How do we detect that the kernel will handle it better?

>
>>> on a kernel where it can be interrupted, we could remove the mkfs loop
>>> at a later date if we wanted to.
>>
>> I'd rather not touch mkfs if a trivial kernel patch handles the issue.
>
> Did some version of Tetsuo's patch even make it for 5.5?  It seemed to
> call submit_bio_wait from within a blk_plug region, which seems way
> worse.
>

It did not yet, I can ping on the series with reference to this discussion.

> --D
>


  reply index

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-28  6:21 Pavel Reichl
2019-11-30 22:01 ` Chaitanya Kulkarni
2019-12-02 16:40   ` Darrick J. Wong
2019-12-04 16:24   ` Eric Sandeen
2019-12-04 17:26     ` Christoph Hellwig
2019-12-04 17:32       ` Eric Sandeen
2019-12-04 17:42       ` Darrick J. Wong
2019-12-10  7:33         ` Chaitanya Kulkarni [this message]
2019-12-10 14:20           ` Eric Sandeen
2019-12-09 22:00 ` Eric Sandeen
2019-12-09 23:34   ` Darrick J. Wong
2019-12-10  0:49     ` Eric Sandeen

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