On Fri, May 13, 2011 at 9:16 AM, Linus Torvalds
<torvalds@xxxxxxxxxxxxxxxxxxxx> wrote:
>
> Looks ok to me. And generates good code for acl_permission_check
> without CONFIG_USER_NS.
>
> I'll see how much that function drops on the kernel profiles..
Yup, looking good.
For my "kernel make with no changes" workload, it dropped from
1.28% make [kernel.kallsyms] [k] acl_permission_check
to
0.88% make [kernel.kallsyms] [k]
acl_permission_check
which is pretty much exactly the expected 30% drop from no longer
having that expensive load of user_ns.
Of course, that 30% improvement is just a 0.4% performance improvement
in the big picture, but hey, almost half a percentage point on a real
load from just one single function in the kernel is definitely worth
doing.
Do you want to carry this for 2.6.40, or should I just apply it?
Linus
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