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charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi Michal, First off, thank you for sharing your opinion. I'd like to monitor the peak memory usage recorded of overall system or at = least cgroup accounted memory through memory.peak. But it looks like this is not relevant to what I wanted. It might be good to have some proper way for checking the system's peak mem= ory usage recorded. Thanks, Matthew ________________________________ From: Michal Koutn=FD Sent: Thursday, February 23, 2023 3:20 PM To: Matthew Chae Cc: Johannes Weiner; Michal Hocko; Roman Gushchin; Shakeel Butt; Andrew Mor= ton; kernel; Christopher Wong; Muchun Song; cgroups@vger.kernel.org; linux-= mm@kvack.org; linux-kernel@vger.kernel.org Subject: Re: [PATCH] mm/memcontrol: add memory.peak in cgroup root Hello Matthew. On Tue, Feb 21, 2023 at 03:34:20PM +0100, Matthew Chae wrote: > The kernel currently doesn't provide any method to show the overall > system's peak memory usage recorded. Instead, only each slice's peak > memory usage recorded except for cgroup root is shown through each > memory.peak. The memory.peak value is useful as a calibration insight when you want to configure memcg limit. But there is no global (memcg) limit on memory. So what would be this (not clearly) defined value good for? Or better then userspace sampling of chosen available metric? Thanks, Michal --_000_AM5PR0202MB25167BFBBE892630A2EE3B7DE1AB9AM5PR0202MB2516_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Hi Michal,

First off, t= hank you for sharing your opinion.
I'd like to = monitor the peak memory usage recorded of overall system or at least cgroup= accounted memory through memory.peak.
But it looks= like this is not relevant to what I wanted.
It might be = good to have some proper way for checking the system's peak memory usage re= corded.

Thanks,
Matthew

From: Michal Koutn=FD
Sent: Thursday, February 23, 2023 3:20 PM
To: Matthew Chae
Cc: Johannes Weiner; Michal Hocko; Roman Gushchin; Shakeel Butt; And= rew Morton; kernel; Christopher Wong; Muchun Song; cgroups@vger.kernel.org;= linux-mm@kvack.org; linux-kernel@vger.kernel.org
Subject: Re: [PATCH] mm/memcontrol: add memory.peak in cgroup root

Hello Matthew.

On Tue, Feb 21, 2023 at 03:34:20PM +0100, Matthew Chae <matthew.chae@axi= s.com> wrote:
> The kernel currently doesn't provide any method to show the overall > system's peak memory usage recorded. Instead, only each slice's peak > memory usage recorded except for cgroup root is shown through each
> memory.peak.

The memory.peak value is useful as a calibration insight when you want to configure memcg limit.
But there is no global (memcg) limit on memory. So what would be this
(not clearly) defined value good for? Or better then userspace sampling
of chosen available metric?

Thanks,
Michal
--_000_AM5PR0202MB25167BFBBE892630A2EE3B7DE1AB9AM5PR0202MB2516_--