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From: Eric Sandeen <sandeen@sandeen.net>
To: Chaitanya Kulkarni <Chaitanya.Kulkarni@wdc.com>,
	"Darrick J. Wong" <darrick.wong@oracle.com>,
	Christoph Hellwig <hch@infradead.org>
Cc: 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 08:20:42 -0600
Message-ID: <fc7184ca-dfbe-9bf8-e790-405766f37bd8@sandeen.net> (raw)
In-Reply-To: <BYAPR04MB5749AF1A90B082FBD8662284865B0@BYAPR04MB5749.namprd04.prod.outlook.com>

On 12/10/19 1:33 AM, Chaitanya Kulkarni wrote:
> 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.

That's fine, though I'm going to merge this patch in any case; we need a solution
for kernels that are not bleeding-edge new as well.

-eric

  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
2019-12-10 14:20           ` Eric Sandeen [this message]
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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