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From: Matthew Wilcox <willy@infradead.org>
To: Joakim Tjernlund <Joakim.Tjernlund@infinera.com>
Cc: "linux-mm@kvack.org" <linux-mm@kvack.org>,
	linux-arm-kernel@lists.infradead.org
Subject: Re: Finding kernel RAM consumers ?
Date: Fri, 3 Jun 2022 18:29:58 +0100	[thread overview]
Message-ID: <YppFFtMAMYZti8Zt@casper.infradead.org> (raw)
In-Reply-To: <dc5f75c008c107c3f888ab8815998af89e3819e8.camel@infinera.com>

On Fri, Jun 03, 2022 at 05:26:33PM +0000, Joakim Tjernlund wrote:
> On Fri, 2022-06-03 at 08:49 +0200, Joakim Tjernlund wrote:
> > On Thu, 2022-06-02 at 21:11 +0100, Matthew Wilcox wrote:
> > > On Thu, Jun 02, 2022 at 07:24:23PM +0000, Joakim Tjernlund wrote:
> > > > We have this small embedded target(aarch64) with 32 MB of RAM where the kernel consumes 14420K:
> > > > Memory: 22444K/36864K available (3584K kernel code, 698K rwdata, 936K rodata, 320K init, 255K bss, 14420K reserved, 0K cma-reserved)
> > > > 
> > > > I want to track down were most of this RAM is consumed so I can trim away some MBs
> > > > but I am having a hard time finding may way.
> > > > Is there some tool/kernel config that can help me with that?
> > 
> > Those are interesting, thanks.
> > In my case it is the amount of work space RAM allocated that is a bit much. The kernel code/data
> > is 5+MB but the total need is 14MB, 9MB is buffer and similar.
> > 
> >  Jocke
> 
> Found something, arm64 only supports mem model SPARSEMEM_EXTREME and it uses most of my memory.
> Tried to force SPARSEMEM_STATIC but that didn't boot, is STATIC even cheaper ? 
That sounds like a question for the arm64 maintainers

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WARNING: multiple messages have this Message-ID (diff)
From: Matthew Wilcox <willy@infradead.org>
To: Joakim Tjernlund <Joakim.Tjernlund@infinera.com>
Cc: "linux-mm@kvack.org" <linux-mm@kvack.org>,
	linux-arm-kernel@lists.infradead.org
Subject: Re: Finding kernel RAM consumers ?
Date: Fri, 3 Jun 2022 18:29:58 +0100	[thread overview]
Message-ID: <YppFFtMAMYZti8Zt@casper.infradead.org> (raw)
In-Reply-To: <dc5f75c008c107c3f888ab8815998af89e3819e8.camel@infinera.com>

On Fri, Jun 03, 2022 at 05:26:33PM +0000, Joakim Tjernlund wrote:
> On Fri, 2022-06-03 at 08:49 +0200, Joakim Tjernlund wrote:
> > On Thu, 2022-06-02 at 21:11 +0100, Matthew Wilcox wrote:
> > > On Thu, Jun 02, 2022 at 07:24:23PM +0000, Joakim Tjernlund wrote:
> > > > We have this small embedded target(aarch64) with 32 MB of RAM where the kernel consumes 14420K:
> > > > Memory: 22444K/36864K available (3584K kernel code, 698K rwdata, 936K rodata, 320K init, 255K bss, 14420K reserved, 0K cma-reserved)
> > > > 
> > > > I want to track down were most of this RAM is consumed so I can trim away some MBs
> > > > but I am having a hard time finding may way.
> > > > Is there some tool/kernel config that can help me with that?
> > 
> > Those are interesting, thanks.
> > In my case it is the amount of work space RAM allocated that is a bit much. The kernel code/data
> > is 5+MB but the total need is 14MB, 9MB is buffer and similar.
> > 
> >  Jocke
> 
> Found something, arm64 only supports mem model SPARSEMEM_EXTREME and it uses most of my memory.
> Tried to force SPARSEMEM_STATIC but that didn't boot, is STATIC even cheaper ? 
That sounds like a question for the arm64 maintainers


  reply	other threads:[~2022-06-03 17:31 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-06-02 19:24 Finding kernel RAM consumers ? Joakim Tjernlund
2022-06-02 20:11 ` Matthew Wilcox
2022-06-03  6:49   ` Joakim Tjernlund
2022-06-03 17:26     ` Joakim Tjernlund
2022-06-03 17:29       ` Matthew Wilcox [this message]
2022-06-03 17:29         ` Matthew Wilcox
2022-06-03 18:11         ` Arnd Bergmann
2022-06-03 18:11           ` Arnd Bergmann
2022-06-07  5:41           ` Alexander Dahl
2022-06-07  5:41             ` Alexander Dahl
2022-06-07  8:38             ` Arnd Bergmann
2022-06-07  8:38               ` Arnd Bergmann
2022-06-07  8:54               ` Joakim Tjernlund
2022-06-07  8:54                 ` Joakim Tjernlund
2022-06-07  9:44               ` Russell King (Oracle)
2022-06-07 10:22                 ` Arnd Bergmann
2022-06-07 10:22                   ` Arnd Bergmann

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