Re: [PATCH 4/5] mm/hotplug: Avoid RCU stalls when removing large amounts of memory

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To: "Alastair D'Silva" <alastair@xxxxxxxxxxx>
Subject: Re: [PATCH 4/5] mm/hotplug: Avoid RCU stalls when removing large amounts of memory
From: Oscar Salvador <osalvador@xxxxxxx>
Date: Mon, 17 Jun 2019 17:49:23 +0200
Cc: "'Michal Hocko'" <mhocko@xxxxxxxxxx>, "'Alastair D'Silva'" <alastair@xxxxxxxxxxx>, "'Arun KS'" <arunks@xxxxxxxxxxxxxx>, "'Mukesh Ojha'" <mojha@xxxxxxxxxxxxxx>, "'Logan Gunthorpe'" <logang@xxxxxxxxxxxx>, "'Wei Yang'" <richard.weiyang@xxxxxxxxx>, "'Peter Zijlstra'" <peterz@xxxxxxxxxxxxx>, "'Ingo Molnar'" <mingo@xxxxxxxxxx>, linux-mm@xxxxxxxxx, "'Qian Cai'" <cai@xxxxxx>, "'Thomas Gleixner'" <tglx@xxxxxxxxxxxxx>, "'Andrew Morton'" <akpm@xxxxxxxxxxxxxxxxxxxx>, "'Mike Rapoport'" <rppt@xxxxxxxxxxxxxxxxxx>, "'Baoquan He'" <bhe@xxxxxxxxxx>, "'David Hildenbrand'" <david@xxxxxxxxxx>, "'Josh Poimboeuf'" <jpoimboe@xxxxxxxxxx>, "'Pavel Tatashin'" <pasha.tatashin@xxxxxxxxxx>, "'Juergen Gross'" <jgross@xxxxxxxx>, "'Oscar Salvador'" <osalvador@xxxxxxxx>, "'Jiri Kosina'" <jkosina@xxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx
In-reply-to: <068b01d524e2$4a5f5c30$df1e1490$@d-silva.org>
References: <20190617043635.13201-1-alastair@au1.ibm.com> <20190617043635.13201-5-alastair@au1.ibm.com> <20190617074715.GE30420@dhcp22.suse.cz> <068b01d524e2$4a5f5c30$df1e1490$@d-silva.org>
User-agent: Mutt/1.10.1 (2018-07-13)

On Mon, Jun 17, 2019 at 05:57:16PM +1000, Alastair D'Silva wrote:
> I was getting stalls when removing ~1TB of memory.

Would you mind sharing one of those stalls-splats?
I am bit spectic here because as I Michal pointed out, we do cond_resched
once per section removed.

-- 
Oscar Salvador
SUSE L3

References:
- [PATCH 0/5] mm: Cleanup & allow modules to hotplug memory
  - From: Alastair D'Silva
- [PATCH 4/5] mm/hotplug: Avoid RCU stalls when removing large amounts of memory
  - From: Alastair D'Silva
- Re: [PATCH 4/5] mm/hotplug: Avoid RCU stalls when removing large amounts of memory
  - From: Michal Hocko
- RE: [PATCH 4/5] mm/hotplug: Avoid RCU stalls when removing large amounts of memory
  - From: Alastair D'Silva

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