linux-kernel - Re: [PATCH v2] printk: Improve memory usage logging during boot

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Message-ID: <Zw5ke11y4TkRQJQ2@google.com>
Date: Tue, 15 Oct 2024 05:47:55 -0700
From: Isaac Manjarres <isaacmanjarres@...gle.com>
To: Petr Mladek <pmladek@...e.com>
Cc: Steven Rostedt <rostedt@...dmis.org>,
	John Ogness <john.ogness@...utronix.de>,
	Sergey Senozhatsky <senozhatsky@...omium.org>, surenb@...gle.com,
	kernel-team@...roid.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] printk: Improve memory usage logging during boot

On Wed, Oct 02, 2024 at 11:04:48AM -0700, Isaac Manjarres wrote:
> On Tue, Oct 01, 2024 at 05:46:31PM +0200, Petr Mladek wrote:
> > On Mon 2024-09-30 11:48:24, Isaac J. Manjarres wrote:
> > > With the new logs, it is much easier to see exactly why the memory
> > > increased by 2304 KB:
> > > 
> > > log_buf_len=512K:
> > > 
> > > printk: log_buf_len: 524288 bytes
> > > printk: prb_descs size: 393216 bytes
> > > printk: printk_infos size: 1441792 bytes
> > 
> > This should get updated to the new format.
> > If I count correctly then it should be:
> > 
> > printk: log buffer data + meta data: 524288 + 1835008 = 2359296 bytes
> Sorry, I forgot to do that; thanks for catching it. Yes, the
> calculation is correct.
> 
> > > Memory: ... (... 733252K reserved ...)
> > > 
> > > log_buf_len=1M:
> > > 
> > > printk: log_buf_len: 1048576 bytes
> > > printk: prb_descs size: 786432 bytes
> > > printk: printk_infos size: 2883584 bytes
> > 
> > and here:
> > 
> > printk: log buffer data + meta data: 1048576 + 3670016 = 4718592 bytes
> This is also correct.
> 
> > > Memory: ... (... 735556K reserved ...)
> > >
> > > Signed-off-by: Isaac J. Manjarres <isaacmanjarres@...gle.com>
> > 
> > Otherwise, it looks good. With the updated commit message:
> > 
> > Reviewed-by: Petr Mladek <pmladek@...e.com>
> > Tested-by: Petr Mladek <pmladek@...e.com>
> > 
> > 
> > Note need to send v3. I could update the commit message when committing
> > the patch.
> > 
> > I am going to wait few days for a potential another review
> > before pushing.
> Thank you Petr for your review and for picking this up! I really
> appreciate it.
> 
> Thanks,
> Isaac

Hi Petr,

I just wanted to follow up to see if there was anything else left
for this patch? Otherwise, would it be possible to please merge this?

Thank you,
Isaac