f238a98e84
Adds HSA timeout hint of 2 seconds to the AMDGPU nextgen-plugin to improve performance of small kernels. The HSA runtime may stay in HSA_WAIT_STATE_ACTIVE for up to the timeout value before switching to HSA_WAIT_STATE_BLOCKED. This can improve latency from which small kernels can benefit. The value was determined via experimentation w/ different benchmarks. The timeout value can be overriden using the environment variable LIBOMPTARGET_AMDGPU_STREAM_BUSYWAIT with a value in microseconds. Original author: Greg Rodgers <Gregory.Rodgers@amd.com> Contributions from: JP Lehr <JanPatrick.Lehr@amd.com> Differential Revision: https://reviews.llvm.org/D148808
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