From: Matthew Wilcox <willy@infradead.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Christoph Hellwig <hch@infradead.org>,
Manjong Lee <mj0123.lee@samsung.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
seunghwan.hyun@samsung.com, sookwan7.kim@samsung.com,
nanich.lee@samsung.com, yt0928.kim@samsung.com,
junho89.kim@samsung.com, jisoo2146.oh@samsung.com
Subject: Re: [PATCH 1/1] mm: bdi: Initialize bdi_min_ratio when bdi unregister
Date: Fri, 22 Oct 2021 03:58:13 +0100 [thread overview]
Message-ID: <YXIoxefk8UDDCt0M@casper.infradead.org> (raw)
In-Reply-To: <20211021194530.1fabf4fa45cfe3bee6598484@linux-foundation.org>
On Thu, Oct 21, 2021 at 07:45:30PM -0700, Andrew Morton wrote:
> On Thu, 21 Oct 2021 13:01:30 +0100 Matthew Wilcox <willy@infradead.org> wrote:
>
> > On Thu, Oct 21, 2021 at 04:16:52AM -0700, Christoph Hellwig wrote:
> > > On Fri, Oct 22, 2021 at 01:19:43AM +0900, Manjong Lee wrote:
> > > > Because when sdcard is removed, bdi_min_ratio value will remain.
> > > > Currently, the only way to reset bdi_ min_ratio is to reboot.
> > >
> > > But bdis that are unregistered are never re-registered. What is
> > > the problem you're trying to solve?
> >
> > The global bdi_min_ratio needs to be adjusted. See
> > bdi_set_min_ratio() in mm/page-writeback.c.
>
> I added cc:stable to this and tweaked the comment & coding style a bit:
Definitely improvements on that front.
I don't know the BDI code particularly well, and the implementation of
bdi_set_min_ratio() confuses me, so I can't say whether the original
patch is clearly correct or not.
next prev parent reply other threads:[~2021-10-22 2:59 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20211021072307epcas1p4aa4388c13e71a66e3e1d5f7ee68b5a7f@epcas1p4.samsung.com>
2021-10-21 16:19 ` Manjong Lee
2021-10-21 11:16 ` Christoph Hellwig
2021-10-21 12:01 ` Matthew Wilcox
2021-10-22 2:45 ` Andrew Morton
2021-10-22 2:58 ` Matthew Wilcox [this message]
[not found] ` <CGME20211022043310epcas1p22952e8fa3eb3675717badae9a3e1223e@epcas1p2.samsung.com>
2021-10-22 13:39 ` Manjong Lee
2021-12-10 21:35 ` Peter Zijlstra
2021-12-10 21:36 ` Peter Zijlstra
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