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 <20240515012350.1166350-3-zhaoyang.huang@unisoc.com> <ZkQ1dsHKVttb7y4_@casper.infradead.org>
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From: Zhaoyang Huang <huangzhaoyang@gmail.com>
Date: Wed, 15 May 2024 14:31:45 +0800
Message-ID: <CAGWkznH1dxyF17cQi+9+0EadoG7_MVUNy8n-svQ7ZjYNaWKYdQ@mail.gmail.com>
Subject: Re: [RFC PATCH 2/2] mm: introduce budgt control in readahead
To: Matthew Wilcox <willy@infradead.org>
Cc: "zhaoyang.huang" <zhaoyang.huang@unisoc.com>, Andrew Morton <akpm@linux-foundation.org>, 
	Jens Axboe <axboe@kernel.dk>, Tejun Heo <tj@kernel.org>, Josef Bacik <josef@toxicpanda.com>, 
	Baolin Wang <baolin.wang@linux.alibaba.com>, linux-mm@kvack.org, 
	linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, 
	cgroups@vger.kernel.org, steve.kang@unisoc.com
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On Wed, May 15, 2024 at 12:09=E2=80=AFPM Matthew Wilcox <willy@infradead.or=
g> wrote:
>
> On Wed, May 15, 2024 at 09:23:50AM +0800, zhaoyang.huang wrote:
> > +     unsigned long budgt =3D 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.