On Mon, 31 Oct 2016, Fengguang Wu wrote:
On Fri, Oct 28, 2016 at 12:37:45AM +0200, Thomas Gleixner wrote:
> I have no explanation for this either, but you really should try to figure
> out what's going on here.
Xiaolong, how about doing a small debug patch (a WARN_ONCE() line may
be enough) to verify whether the code path is executed?
It'd also help to compare vmlinux according to Thomas' reasoning:
> The only difference between plain rc1 and rc + this patch is the resulting
> text size and therefor some other unrelated stuff moving to different
> places in memory which has some yet to figure out side effects.
So one other thing you might try is using rc3 as a base line and then
revert the patch in question on top of rc3 and see whether that weird
> From bisect POV, the below graphs show the user_time and
are clearly and consistently different before/after commit 71854cb812.
So this commit must impacted something.
I agree. I just have no idea what happens.