linux-kernel - Re: [PATCH] mm: Be less noisy during memory hotplug

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Date:   Wed, 29 Mar 2023 20:46:53 +0000
From:   "Krcka, Tomas" <krckatom@...zon.de>
To:     Pasha Tatashin <pasha.tatashin@...een.com>
CC:     "linux-mm@...ck.org" <linux-mm@...ck.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Alexander Duyck <alexander.h.duyck@...ux.intel.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm: Be less noisy during memory hotplug



> On 23. Mar 2023, at 20:06, Pasha Tatashin <pasha.tatashin@...een.com> wrote:
> 
> 
> On Thu, Mar 23, 2023 at 2:37 PM Pasha Tatashin
> <pasha.tatashin@...een.com> wrote:
>> 
>> On Thu, Mar 23, 2023 at 1:19 PM Tomas Krcka <krckatom@...zon.de> wrote:
>>> 
>>> Turn a pr_info() into a pr_debug() to prevent dmesg spamming on systems
>>> where memory hotplug is a frequent operation.
>>> 
>>> Fixes: 966cf44f637e ("mm: defer ZONE_DEVICE page initialization to the point where we init pgmap")
>>> 
>>> Suggested-by: Jan H. Schönherr <jschoenh@...zon.de>
>>> Signed-off-by: Tomas Krcka <krckatom@...zon.de>
>> 
>> Reviewed-by: Pasha Tatashin <pasha.tatashin@...een.com>
> 
> Can you please specify what you mean by frequent hotplug: wow frequent
> is it and what is the usecase?

The use case is virtualization environment, case like new virtual machines
are spun up and shut down frequently and where the workload of the virtual
machines varies widely over time. So specially in case of small virtual machines.
We can talk about multiple times per hour, depends on the workload.

> 
> Thanks,
> Pasha




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