Re: Memory CG and 5.1 to 5.6 uprade slows backup

To: Bruno Prémont <bonbons@xxxxxxxxxxxxxxxxx>
Subject: Re: Memory CG and 5.1 to 5.6 uprade slows backup
From: Chris Down <chris@xxxxxxxxxxxxxx>
Date: Thu, 9 Apr 2020 18:56:46 +0100
Cc: Michal Hocko <mhocko@xxxxxxxxxx>, cgroups@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, Johannes Weiner <hannes@xxxxxxxxxxx>, Vladimir Davydov <vdavydov.dev@xxxxxxxxx>
In-reply-to: <20200409175044.GC1040020@chrisdown.name>
References: <20200409112505.2e1fc150@hemera.lan.sysophe.eu> <20200409094615.GE18386@dhcp22.suse.cz> <20200409121733.1a5ba17c@hemera.lan.sysophe.eu> <20200409103400.GF18386@dhcp22.suse.cz> <20200409170926.182354c3@hemera.lan.sysophe.eu> <20200409152417.GB1040020@chrisdown.name> <20200409174042.2a3389ba@hemera.lan.sysophe.eu> <20200409175044.GC1040020@chrisdown.name>

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

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

References:
- Memory CG and 5.1 to 5.6 uprade slows backup
  - From: Bruno Prémont
- Re: Memory CG and 5.1 to 5.6 uprade slows backup
  - From: Michal Hocko
- Re: Memory CG and 5.1 to 5.6 uprade slows backup
  - From: Bruno Prémont
- Re: Memory CG and 5.1 to 5.6 uprade slows backup
  - From: Michal Hocko
- Re: Memory CG and 5.1 to 5.6 uprade slows backup
  - From: Bruno Prémont
- Re: Memory CG and 5.1 to 5.6 uprade slows backup
  - From: Chris Down
- Re: Memory CG and 5.1 to 5.6 uprade slows backup
  - From: Bruno Prémont
- Re: Memory CG and 5.1 to 5.6 uprade slows backup
  - From: Chris Down