User space tools which do automated task placement need information about AVX-512 usage of tasks, because AVX-512 usage could cause core turbo frequency drop and impact the running task on the sibling CPU.
The XSAVE hardware structure has bits that indicate when valid state is present in registers unique to AVX-512 use. Use these bits to indicate when AVX-512 has been in use and add per-task AVX-512 state timestamp tracking to context switch. Well-written AVX-512 applications are expected to clear the AVX-512 state when not actively using AVX-512 registers, so the tracking mechanism is imprecise and can theoretically miss AVX-512 usage during context switch. But it has been measured to be precise enough to be useful under real-world workloads like tensorflow and linpack. If higher precision is required, suggest user space tools to use the PMU-based mechanisms in combination. Signed-off-by: Aubrey Li <aubrey...@linux.intel.com> Cc: Peter Zijlstra <pet...@infradead.org> Cc: Andi Kleen <a...@linux.intel.com> Cc: Tim Chen <tim.c.c...@linux.intel.com> Cc: Dave Hansen <dave.han...@intel.com> Cc: Arjan van de Ven <ar...@linux.intel.com> --- arch/x86/include/asm/fpu/internal.h | 7 +++++++ arch/x86/include/asm/fpu/types.h | 7 +++++++ 2 files changed, 14 insertions(+) diff --git a/arch/x86/include/asm/fpu/internal.h b/arch/x86/include/asm/fpu/internal.h index a38bf5a1e37a..8778ac172255 100644 --- a/arch/x86/include/asm/fpu/internal.h +++ b/arch/x86/include/asm/fpu/internal.h @@ -411,6 +411,13 @@ static inline int copy_fpregs_to_fpstate(struct fpu *fpu) { if (likely(use_xsave())) { copy_xregs_to_kernel(&fpu->state.xsave); + + /* + * AVX512 state is tracked here because its use is + * known to slow the max clock speed of the core. + */ + if (fpu->state.xsave.header.xfeatures & XFEATURE_MASK_AVX512) + fpu->avx512_timestamp = jiffies_64; return 1; } diff --git a/arch/x86/include/asm/fpu/types.h b/arch/x86/include/asm/fpu/types.h index 202c53918ecf..81393dabdb46 100644 --- a/arch/x86/include/asm/fpu/types.h +++ b/arch/x86/include/asm/fpu/types.h @@ -302,6 +302,13 @@ struct fpu { */ unsigned char initialized; + /* + * @avx512_timestamp: + * + * Records the timestamp of AVX512 use during last context switch. + */ + u64 avx512_timestamp; + /* * @state: * -- 2.17.1