linux-kernel - Re: [syzbot] [mm?] BUG: Bad page map (7)

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Message-ID: <ZQpPJtWh/rdrbUPm@casper.infradead.org>
Date:   Wed, 20 Sep 2023 02:47:18 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     Yin Fengwei <fengwei.yin@...el.com>
Cc:     Dave Hansen <dave.hansen@...el.com>,
        syzbot <syzbot+55cc72f8cc3a549119df@...kaller.appspotmail.com>,
        akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [mm?] BUG: Bad page map (7)

On Wed, Sep 20, 2023 at 09:29:18AM +0800, Yin Fengwei wrote:
> 
> 
> On 9/20/23 00:11, Dave Hansen wrote:
> > On 9/18/23 18:11, Yin Fengwei wrote:
> >>> I will find a test machine to measure the performance difference of these two
> >>> versions by using xfs + will-it-scale. Will keep you guys updated.
> >> I'd like to move this bug fixing forward. Based on the test result here:
> >> https://lore.kernel.org/linux-mm/124631ab-eb4c-6584-12d4-f3c91e69c873@intel.com/
> >> There is very small performance delta between your version and Dave's.
> >>
> >> What do you think if we propose to merge Dave's version? Or do I need collect
> >> more data? Thanks.
> > 
> > I honestly don't feel that strongly about my version versus Matthew's.
> > I like mine, but I'll happily ack either approach.
> > 
> > The thing I care about the most is getting the bug fixed ... quickly. :)
> Same in my side.

I'm just redoing the commit message now.