Messages in this thread | | | Date | Thu, 12 Sep 2013 22:49:10 +0200 | From | Ingo Molnar <> | Subject | Re: [GIT PULL] perf fixes |
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* Linus Torvalds <torvalds@linux-foundation.org> wrote:
> On Thu, Sep 12, 2013 at 1:33 PM, Ingo Molnar <mingo@kernel.org> wrote: > > > > Hm, just to make sure, are you running a (very fresh) kernel that has this > > fix included: > > > > d008d5258e9c perf: Fix up MMAP2 buffer space reservation > > I've rebooted about five times since that report, so I'm not sure.. > > [ Short time passes ] > > Hmm. That "reproducible" error is no longer reproducible for me on > current git (68f0d9d92e54). So if you fixed something recently, it's > possible I was running a pre-perf-pull kernel and an after-perf-pull > "perf" binary.
Yeah, so I think prior merging d008d5258e9c you'd see those artifacts with new, MMAP2-aware perf tooling. Both older kernels would work fine with any version of the tooling, and old tooling would work fine. Only new tooling used on a kernel within the breakage window would be exposed to this.
I think the window of breakage is relatively small (you managed to hit it), but should we add a quirk for this?
Thanks,
Ingo
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