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23b1f18326
The existing pmu documentation describes the limitation of perf infrastructure in RISC-V ISA and limited feature set of perf in RISC-V. However, SBI PMU extension and sscofpmf extension(ISA extension) allows to implement most of the required features of perf. Remove the old documentation which is not accurate anymore. Reviewed-by: Anup Patel <anup@brainfault.org> Signed-off-by: Atish Patra <atish.patra@wdc.com> Signed-off-by: Atish Patra <atishp@rivosinc.com> Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>