Re: 4.19.21: perf does not work on Ryzen, OK with 4.19.20

[Peter Zijlstra]

On Wed, Feb 13, 2019 at 12:08:03PM +0100, Sami Farin wrote:
> The same .config, BIOS, and kernel boot parameters in both kernels.
> 
> # perf top -v
>            ââError:âââââââââââââââââââââââââââââââââââââââââ
>            âFailed to mmap with 12 (Cannot allocate memory)â

I think you got bit by this one:

http://lkml.kernel.org/r/tip-528871b456026e6127d95b1b2bd8e3a003dc1614@xxxxxxxxxxxxxx