linux-kernel - Re: [RFC PATCH 2/2] mm: introduce budgt control in readahead

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Message-ID: <CAGWkznH1dxyF17cQi+9+0EadoG7_MVUNy8n-svQ7ZjYNaWKYdQ@mail.gmail.com>
Date: Wed, 15 May 2024 14:31:45 +0800
From: Zhaoyang Huang <huangzhaoyang@...il.com>
To: Matthew Wilcox <willy@...radead.org>
Cc: "zhaoyang.huang" <zhaoyang.huang@...soc.com>, Andrew Morton <akpm@...ux-foundation.org>, 
	Jens Axboe <axboe@...nel.dk>, Tejun Heo <tj@...nel.org>, Josef Bacik <josef@...icpanda.com>, 
	Baolin Wang <baolin.wang@...ux.alibaba.com>, linux-mm@...ck.org, 
	linux-block@...r.kernel.org, linux-kernel@...r.kernel.org, 
	cgroups@...r.kernel.org, steve.kang@...soc.com
Subject: Re: [RFC PATCH 2/2] mm: introduce budgt control in readahead

On Wed, May 15, 2024 at 12:09 PM Matthew Wilcox <willy@...radead.org> wrote:
>
> On Wed, May 15, 2024 at 09:23:50AM +0800, zhaoyang.huang wrote:
> > +     unsigned long budgt = inode->i_sb->s_bdev ?
> > +                     blk_throttle_budgt(inode->i_sb->s_bdev) : 0;
>
> NAK as previously explained.
ok. But this commit could work by following the configuration of
blk-throttle as long as it works on btrfs with internal RAID on.
Furthermore, this will help the blkcg meet the desired BPS value
perfectly.