Re: [PATCH v9 00/13] support "task_isolation" mode for nohz_full

On 01/13/2016 05:44 AM, Ingo Molnar wrote:

* Chris Metcalf [off-list ref] wrote:

quoted

(Adding Mark to cc's)

On 01/12/2016 05:07 AM, Will Deacon wrote:

quoted

On Mon, Jan 11, 2016 at 04:15:50PM -0500, Chris Metcalf wrote:

quoted

Ping!  There has been no substantive feedback to this version of
the patch in the week since I posted it, which optimistically suggests
to me that people may be satisfied with it.  If that's true, Frederic,
I assume this would be pulled into your tree?

I have slightly updated the v9 patch series since this posting:

[...]

- Incorporated Mark Rutland's changes to convert arm64
   assembly to C code instead of using my own version.

Please avoid queuing these patches -- the first is already in the arm64
queue for 4.5 and the second was found to introduce a substantial
performance regression on the syscall entry/exit path. I think Mark had
an updated version to address that, so it would be easier not to have
an old version sitting in some other queue!

I am not formally queueing them anywhere (like linux-next), though
now that you mention it, that's a pretty good idea - I'll talk to Steven
about that, assuming this merge window closes without the task
isolation stuff going in.

NAK. Given the controversy, no way should this stuff go outside the primary trees
it affects: the scheduler, timer, irq, etc. trees.

Fair enough.  I'll plan to do v10 once the merge window closes.

Mark, let me know when/if you get a new version of the de-asm stuff
for do_notify_resume() - thanks.  Or, would it be helpful if I worked up
the option I suggested, where we check the thread_info flags in the
assembly code before calling out to the new loop in do_notify_resume()?

-- 
Chris Metcalf, EZChip Semiconductor
http://www.ezchip.com