Re: RFC [Patch] Remove"please try 'cgroup_disable=memory' option if you don't want memory cgroups"printk at boot time.

[KAMEZAWA Hiroyuki]

On Wed, 31 Mar 2010 13:57:46 -0400
Rik van Riel <riel@xxxxxxxxxx> wrote:

> On 03/31/2010 11:54 AM, Larry Woodman wrote:
> > On Wed, 2010-03-31 at 11:28 -0400, Larry Woodman wrote:
> >> We are considering removing this printk at boot time from RHEL because
> >> it will confuse customers, encourage them to change the boot parameters
> >> and generate extraneous support calls.  Its documented in
> >> Documentation/kernel-parameters.txt anyway.  Any thoughts???
> 
> Yeah, that is a strange boot message...
> 
> Acked-by: Rik van Riel <riel@xxxxxxxxxx>
> 
please CC linux-mm and maintainers.

Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>

It have been there for a year and I think memory usage by page_cgroup
will not surprise linux kernel users, more.

Assume x86-32.

RHEL allows amount of memory up to 16G, right?

without memcg: memmap uses 32bytes * 16G/4k = 128M.
with memcg:    memmap+page_cgroup uses (32+20) bytes * 16G/4k = 208M.

I thought this may cause OOM in ZONE_NORMAL. Then, I added it when I wrote
original patch. This kind of memory eater can cause trouble when it pops
up suddenly. But I think 'one year' can be an excuse.

Thanks,
-Kame


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