linux-kernel - Re: [PATCH v3] vmstat: Kernel stack usage histogram

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Message-ID: <dz2ryasq3bbshlayah4dja3esvpwu5hzftgaapzbmjf42n7gzk@qs4wfnuuixtu>
Date: Thu, 18 Jul 2024 16:19:44 -0700
From: Shakeel Butt <shakeel.butt@...ux.dev>
To: Pasha Tatashin <pasha.tatashin@...een.com>
Cc: akpm@...ux-foundation.org, jpoimboe@...nel.org, 
	kent.overstreet@...ux.dev, peterz@...radead.org, nphamcs@...il.com, 
	cerasuolodomenico@...il.com, surenb@...gle.com, lizhijian@...itsu.com, willy@...radead.org, 
	vbabka@...e.cz, ziy@...dia.com, linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH v3] vmstat: Kernel stack usage histogram

Hi Pasha,

On Wed, Jul 17, 2024 at 12:50:00PM GMT, Pasha Tatashin wrote:
> On Wed, Jun 12, 2024 at 2:50 PM Shakeel Butt <shakeel.butt@...ux.dev> wrote:
> >
[...]
> > >
> > > One more question: Is there any concern in making
> > > CONFIG_DEBUG_STACK_USAGE not a debug feature i.e. enable in default
> > > kernels instead of just debug kernels?
> 
> We enabled it in Google ProdKernel. There is some overhead when
> threads are exiting, because we are looking for the first non-zero
> byte, but that is minimal. We haven't observed any performance impact
> on our fleet.
>

So, you would support making CONFIG_DEBUG_STACK_USAGE enabled by
default, right?