linux-kernel - Re: [PATCH] xfs: always free inline data before resetting inode fork during ifree

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Message-ID: <20180328132148.GN9275@dhcp22.suse.cz>
Date:   Wed, 28 Mar 2018 15:21:48 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     "Luis R. Rodriguez" <mcgrof@...nel.org>
Cc:     Sasha Levin <levinsasha928@...il.com>,
        Dave Chinner <david@...morbit.com>,
        "Darrick J. Wong" <darrick.wong@...cle.com>,
        Christoph Hellwig <hch@....de>,
        xfs <linux-xfs@...r.kernel.org>,
        "linux-kernel@...r.kernel.org List" <linux-kernel@...r.kernel.org>,
        Sasha Levin <alexander.levin@...rosoft.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Julia Lawall <julia.lawall@...6.fr>,
        Josh Triplett <josh@...htriplett.org>,
        Takashi Iwai <tiwai@...e.de>, Joerg Roedel <joro@...tes.org>
Subject: Re: [PATCH] xfs: always free inline data before resetting inode fork
 during ifree

On Tue 27-03-18 19:54:35, Luis R. Rodriguez wrote:
> On Tue, Mar 27, 2018 at 09:06:37AM +0200, Michal Hocko wrote:
> > So by no means the MM backports were reviewed by me. And considering how hard
> > it is to get any review for MM patches in general I strongly suspect that
> > others didn't review either.
> > 
> > In general I am quite skeptical about the automagic backports
> > selections, to be honest. MM patches should be reasonably good at
> > selecting stable backports and adding more patches on top just risks
> > regressions. 
> 
> BTW other than suggesting we needing *actual review* of the MM patches, are
> there known unit tests which could be run as well? Thinking long term.

There are some in selftests but most fixes are quite hard to get a
specialized testcase for. Rememeber the MM is a pile of heuristics to
handle large scale of workloads.

-- 
Michal Hocko
SUSE Labs