[RFC] Restrict size of page_cgroup->flags

KAMEZAWA Hiroyuki kamezawa.hiroyu at jp.fujitsu.com
Wed Oct 6 16:58:58 PDT 2010


On Wed, 6 Oct 2010 19:53:14 +0530
Balbir Singh <balbir at linux.vnet.ibm.com> wrote:

> I propose restricting page_cgroup.flags to 16 bits. The patch for the
> same is below. Comments?
> 
> 
> Restrict the bits usage in page_cgroup.flags
> 
> From: Balbir Singh <balbir at linux.vnet.ibm.com>
> 
> Restricting the flags helps control growth of the flags unbound.
> Restriciting it to 16 bits gives us the possibility of merging
> cgroup id with flags (atomicity permitting) and saving a whole
> long word in page_cgroup
> 
> Signed-off-by: Balbir Singh <balbir at linux.vnet.ibm.com>

Doesn't make sense until you show the usage of existing bits.
And I guess 16bit may be too large on 32bit systems.

Nack for now.

Thanks,
-Kame



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