linux-kernel - Re: [PATCH 0/6] rds: rdma: Add ability to force GFP

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Date: Wed, 15 May 2024 12:25:22 +0200
From: Zhu Yanjun <yanjun.zhu@...ux.dev>
To: Haakon Bugge <haakon.bugge@...cle.com>, Zhu Yanjun <zyjzyj2000@...il.com>
Cc: OFED mailing list <linux-rdma@...r.kernel.org>,
 open list <linux-kernel@...r.kernel.org>, netdev <netdev@...r.kernel.org>,
 "rds-devel@....oracle.com" <rds-devel@....oracle.com>,
 Jason Gunthorpe <jgg@...pe.ca>, Leon Romanovsky <leon@...nel.org>,
 Saeed Mahameed <saeedm@...dia.com>, Tariq Toukan <tariqt@...dia.com>,
 "David S . Miller" <davem@...emloft.net>, Eric Dumazet
 <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>, Tejun Heo <tj@...nel.org>,
 Lai Jiangshan <jiangshanlai@...il.com>,
 Allison Henderson <allison.henderson@...cle.com>,
 Manjunath Patil <manjunath.b.patil@...cle.com>,
 Mark Zhang <markzhang@...dia.com>, Chuck Lever III <chuck.lever@...cle.com>,
 Shiraz Saleem <shiraz.saleem@...el.com>, Yang Li <yang.lee@...ux.alibaba.com>
Subject: Re: [PATCH 0/6] rds: rdma: Add ability to force GFP_NOIO

在 2024/5/14 20:32, Haakon Bugge 写道:
> Hi Yanjun,
> 
> 
>> On 14 May 2024, at 14:02, Zhu Yanjun <zyjzyj2000@...il.com> wrote:
>>
>>
>>
>> On 14.05.24 10:53, Zhu Yanjun wrote:
>>> On 13.05.24 14:53, Håkon Bugge wrote:
>>>> This series enables RDS and the RDMA stack to be used as a block I/O
>>>> device. This to support a filesystem on top of a raw block device
>>> This is to support a filesystem ... ?
>>
>> Sorry. my bad. I mean, normally rds is used to act as a communication protocol between Oracle databases. Now in this patch series, it seems that rds acts as a communication protocol to support a filesystem. So I am curious which filesystem that rds is supporting?
> 
> The peer here is a file-server which acts a block device. What Oracle calls a cell-server. The initiator here, is actually using XFS over an Oracle in-kernel pseudo-volume block device.

Thanks Haakon.
There is a link about GFP_NOFS and GFP_NOIO, 
https://lore.kernel.org/linux-fsdevel/ZZcgXI46AinlcBDP@casper.infradead.org/.

I am not sure if you have read this link or not. In this link, the 
writer has his ideas about GFP_NOFS and GFP_NOIO.

"
My interest in this is that I'd like to get rid of the FGP_NOFS flag. 
It'd also be good to get rid of the __GFP_FS flag since there's always 
demand for more GFP flags.  I have a git branch with some work in this 
area, so there's a certain amount of conference-driven development going 
on here too.

We could mutatis mutandi for GFP_NOIO, memalloc_noio_save/restore, 
__GFP_IO, etc, so maybe the block people are also interested.  I haven't 
looked into that in any detail though.  I guess we'll see what interest 
this topic gains.
"

Anyway, good luck!

Zhu Yanjun

> 
> 
> Thxs,  Håkon
>