linux-kernel - Re: [PATCH] f2fs: introduce DEFAULT_IO_TIMEOUT

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Message-ID: <1cc2d2a093ebb15a1fc6eb96d683e918a8d5a7d4.camel@dubeyko.com>
Date:   Wed, 25 Dec 2019 12:58:47 +0300
From:   Vyacheslav Dubeyko <slava@...eyko.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        Chao Yu <yuchao0@...wei.com>
Cc:     Jaegeuk Kim <jaegeuk@...nel.org>,
        linux-f2fs-devel@...ts.sourceforge.net,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Chao Yu <chao@...nel.org>,
        Linux FS Devel <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH] f2fs: introduce DEFAULT_IO_TIMEOUT_JIFFIES

On Mon, 2019-12-23 at 09:41 +0100, Geert Uytterhoeven wrote:
> Hi,
> 
> CC linux-fsdevel
> 
> On Mon, Dec 23, 2019 at 5:01 AM Chao Yu <yuchao0@...wei.com> wrote:
> > As Geert Uytterhoeven reported:
> > 
> > for parameter HZ/50 in congestion_wait(BLK_RW_ASYNC, HZ/50);
> > 
> > On some platforms, HZ can be less than 50, then unexpected 0
> > timeout
> > jiffies will be set in congestion_wait().
> > 


It looks like that HZ could have various value on diferent platforms.
So, why does it need to divide HZ on 50? Does it really necessary?
Could it be used HZ only without the division operation?

Thanks,
Viacheslav Dubeyko.