[PATCH v4 1/2] powerpc/perf: Implement a global lock to avoid races between trace, core and thread imc events.

[Michael Ellerman]

On Fri, 2020-03-13 at 05:52:37 UTC, Anju T Sudhakar wrote:
> IMC(In-memory Collection Counters) does performance monitoring in
> two different modes, i.e accumulation mode(core-imc and thread-imc events),
> and trace mode(trace-imc events). A cpu thread can either be in
> accumulation-mode or trace-mode at a time and this is done via the LDBAR
> register in POWER architecture. The current design does not address the
> races between thread-imc and trace-imc events.
> 
> Patch implements a global id and lock to avoid the races between
> core, trace and thread imc events. With this global id-lock
> implementation, the system can either run core, thread or trace imc
> events at a time. i.e. to run any core-imc events, thread/trace imc events
> should not be enabled/monitored.
> 
> Signed-off-by: Anju T Sudhakar <anju at linux.vnet.ibm.com>

Series applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/a36e8ba60b991d563677227f172db69e030797e6

cheers