From mboxrd@z Thu Jan  1 00:00:00 1970
From: Chris Down <chris-6Bi1550iOqEnzZ6mRAm98g@public.gmane.org>
Subject: Re: Memory CG and 5.1 to 5.6 uprade slows backup
Date: Thu, 9 Apr 2020 18:56:46 +0100
Message-ID: <20200409175646.GD1040020@chrisdown.name>
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To: Bruno =?iso-8859-1?Q?Pr=E9mont?= <bonbons-ud5FBsm0p/xEiooADzr8i9i2O/JbrIOy@public.gmane.org>
Cc: Michal Hocko <mhocko-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>, cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org, Johannes Weiner <hannes-druUgvl0LCNAfugRpC6u6w@public.gmane.org>, Vladimir Davydov <vdavydov.dev-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>

 From my side, this looks like memory.high is working as intended and there is 
some other generic problem with reclaim happening here.

I think the data which Michal asked for would help a lot to narrow down what's 
going on.