Messages in this thread | | | Subject | Re: [PATCH v9 00/13] support "task_isolation" mode for nohz_full | From | Chris Metcalf <> | Date | Tue, 12 Jan 2016 12:49:46 -0500 |
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(Adding Mark to cc's)
On 01/12/2016 05:07 AM, Will Deacon wrote: > On Mon, Jan 11, 2016 at 04:15:50PM -0500, Chris Metcalf wrote: >> 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.
In the arch/tile code, we load the thread_info_flags and test them against a bitmask before we call into C code, to avoid the various overheads involved in the C path. Perhaps that same strategy is all that's needed for the arm64 code? Hopefully you can get that code merged up during the 4.5 window so I can use it as the new baseline for the task isolation stuff.
Thanks!
-- Chris Metcalf, EZChip Semiconductor http://www.ezchip.com
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