x86/fpu: Track AVX-512 usage of tasks

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.li@linux.intel.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Arjan van de Ven <arjan@linux.intel.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Tim Chen <tim.c.chen@linux.intel.com>
Cc: aubrey.li@intel.com
Link: http://lkml.kernel.org/r/20190117183822.31333-1-aubrey.li@intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/arch/x86/include/asm/fpu/internal.h b/arch/x86/include/asm/fpu/internal.h
index 5d536e3dcc6db36166ad9fc9e1541ccecdfdb4b4..fb04a3ded7ddb2ab284404f0caf0f1e6b1af23aa 100644 (file)
--- a/arch/x86/include/asm/fpu/internal.h
+++ b/arch/x86/include/asm/fpu/internal.h
@@ -376,6 +376,13 @@ 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;
                return 1;
        }
 

diff --git a/arch/x86/include/asm/fpu/types.h b/arch/x86/include/asm/fpu/types.h
index 202c53918ecfa6d82c616eac1776ee88c5f81426..2e32e178e064592221b14133bf4724591950ec96 100644 (file)
--- 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.
+        */
+       unsigned long                   avx512_timestamp;
+
        /*
         * @state:
         *