linux-kernel - Re: 2.6.18-rc3-mm2 early

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Date:	Tue, 8 Aug 2006 17:10:33 -0700
From:	"Keith Mannthey" <kmannth@...il.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	"Hugh Dickins" <hugh@...itas.com>, "Andrew Morton" <akpm@...l.org>,
	"Rusty Russell" <rusty@...tcorp.com.au>, "Andi Kleen" <ak@...e.de>,
	linux-kernel@...r.kernel.org, apw@...dowen.org
Subject: Re: 2.6.18-rc3-mm2 early_param mem= fix

On 8/7/06, Eric W. Biederman <ebiederm@...ssion.com> wrote:
> Hugh Dickins <hugh@...itas.com> writes:
>
> > On Sun, 6 Aug 2006, Hugh Dickins wrote:
> >> I was impressed by how fast 2.6.18-rc3-mm2 is under memory pressure,
> >> until I noticed that my "mem=512M" boot option was doing nothing.  The
> >> two fixes below got it working, but I wonder how many other early_param
> >> "option=" args are wrong (e.g. "memmap=" in the same file): x86_64
> >> shows many such, i386 shows only one, I've not followed it up further.
> >
> > Oh, and that's not enough for it to show up in x86_64's /proc/cmdline.
>
> The /proc/cmdline part is easy.
>
> Someone deleted the copy from saved_command_line to command_line.
> Since kernel/params.c:parse_args called in init/main.c is destructive
> if we don't do this we will never see a reasonable command line in /proc,
> and /init implementations that parse /proc/command_line will choke horribly.
>
> Signed-off-by: Eric W. Biederman <ebiederm@...ssion.com>
>
> diff --git a/arch/x86_64/kernel/setup.c b/arch/x86_64/kernel/setup.c
> index 3bc1ff4..37206a4 100644
> --- a/arch/x86_64/kernel/setup.c
> +++ b/arch/x86_64/kernel/setup.c
> @@ -378,7 +378,8 @@ #endif
>         early_identify_cpu(&boot_cpu_data);
>
>         parse_early_param();
> -       *cmdline_p = saved_command_line;
> +       memcpy(command_line, saved_command_line, COMMAND_LINE_SIZE);
> +       *cmdline_p = command_line;
>
>         finish_e820_parsing();

Ok this helped keep the cmdline around but the early_param is still
busted with 2.6.18-rc3-mm2 (I don't have cmdline problem with non -mm
2.6.18-rc3).

I am booting with numa=hotadd=100 on x86_64.  The parameter
hotadd_percent is not getting setup right. Printk tells me that
numa_setup is not called during boot.

if I change

early_param("numa=", numa_setup);
to
early_param("numa", numa_setup);

The parameter hotadd_percent is setup right but there is a
"Malformed early option 'numa'" message.

Is there some other patch that I missed to fix this?

Also it seems like the earlyconsole isn't getting setup right.... It
seems to take forever to start (say about 20-30 seconds) This pause in
the boot is caused by the reserve hot-add patch but early console
should start before the pause.

command line is root=/dev/sda3
ip=9.47.66.153:9.47.66.169:9.47.66.1:255.255.255.0 resume=/dev/sda2
showopts earlyprintk=ttyS0,115200 console=ttyS0,115200 console=tty0
debug numa=hotadd=100

Again thing work as expected with 2.6.18-rc3.

Thanks,
  Keith
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