On Mon, 18 May 2020 at 19:49, Mark Rutland <mark.rutl...@arm.com> wrote: > > On Mon, May 18, 2020 at 07:39:23PM +0530, Sumit Garg wrote: > > On Mon, 18 May 2020 at 16:47, Alexandru Elisei <alexandru.eli...@arm.com> > > wrote: > > > On 5/18/20 11:45 AM, Mark Rutland wrote: > > > > On Mon, May 18, 2020 at 02:26:00PM +0800, Lecopzer Chen wrote: > > > >> HI Sumit, > > > >> > > > >> Thanks for your information. > > > >> > > > >> I've already implemented IPI (same as you did [1], little difference > > > >> in detail), hardlockup detector and perf in last year(2019) for > > > >> debuggability. > > > >> And now we tend to upstream to reduce kernel maintaining effort. > > > >> I'm glad if someone in ARM can do this work :) > > > >> > > > >> Hi Julien, > > > >> > > > >> Does any Arm maintainers can proceed this action? > > > > Alexandru (Cc'd) has been rebasing and reworking Julien's patches, which > > > > is my preferred approach. > > > > > > > > I understand that's not quite ready for posting since he's investigating > > > > some of the nastier subtleties (e.g. mutual exclusion with the NMI), but > > > > maybe we can put the work-in-progress patches somewhere in the mean > > > > time. > > > > > > > > Alexandru, do you have an idea of what needs to be done, and/or when you > > > > expect you could post that? > > > > > > I'm currently working on rebasing the patches on top of 5.7-rc5, when I > > > have > > > something usable I'll post a link (should be a couple of days). After > > > that I will > > > address the review comments, and I plan to do a thorough testing because > > > I'm not > > > 100% confident that some of the assumptions around the locks that were > > > removed are > > > correct. My guess is this will take a few weeks. > > > > > > > Thanks Mark, Alex for the status updates on perf NMI feature. > > > > Alex, > > > > As the hard-lockup detection patch [1] has a dependency on perf NMI > > patch-set, I will rebase and test hard-lockup detector when you have > > got a working tree. But due to the dependency, I think patch [1] > > should be accepted along with perf NMI patch-set. So would you be open > > to include this patch as part of your series? > > > > [1] > > http://lists.infradead.org/pipermail/linux-arm-kernel/2020-May/732227.html > > While it depends on the perf NMI bits, I don't think it makes sense to > tie that into the series given it's trying to achieve something very > different. > > I think that should be reposted separately once the perf NMI bits are in > shape.
Okay, fair enough. Will keep it as a separate patch then. -Sumit > > Thanks, > Mark.