linux-kernel - Re: [RFC 0/1] Try to add memory allocation info for cgroup oom kill

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Message-ID: <aKdw6Pkj2H4B6QDb@devbig569.cln6.facebook.com>
Date: Thu, 21 Aug 2025 12:18:00 -0700
From: Yueyang Pan <pyyjason@...il.com>
To: Shakeel Butt <shakeel.butt@...ux.dev>
Cc: Suren Baghdasaryan <surenb@...gle.com>,
	Kent Overstreet <kent.overstreet@...ux.dev>,
	Usama Arif <usamaarif642@...il.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC 0/1] Try to add memory allocation info for cgroup oom kill

On Thu, Aug 21, 2025 at 11:35:19AM -0700, Shakeel Butt wrote:
> On Thu, Aug 14, 2025 at 10:11:56AM -0700, Yueyang Pan wrote:
> > Right now in the oom_kill_process if the oom is because of the cgroup 
> > limit, we won't get memory allocation infomation. In some cases, we 
> > can have a large cgroup workload running which dominates the machine. 
> > The reason using cgroup is to leave some resource for system. When this 
> > cgroup is killed, we would also like to have some memory allocation 
> > information for the whole server as well. This is reason behind this 
> > mini change. Is it an acceptable thing to do? Will it be too much 
> > information for people? I am happy with any suggestions!
> 
> For a single patch, it is better to have all the context in the patch
> and there is no need for cover letter.

Thanks for your suggestion Shakeel! I will change this in the next version.

> 
> What exact information you want on the memcg oom that will be helpful
> for the users in general? You mentioned memory allocation information,
> can you please elaborate a bit more.
> 

As in my reply to Suren, I was thinking the system-wide memory usage info 
provided by show_free_pages and memory allocation profiling info can help 
us debug cgoom by comparing them with historical data. What is your take on 
this?

Thanks,
Pan