diff options
| author | Aubrey Li | 2019-06-06 03:22:35 +0200 |
|---|---|---|
| committer | Thomas Gleixner | 2019-06-12 11:42:13 +0200 |
| commit | 0c608dad2a771c0a11b6d12148d1a8b975e015d4 (patch) | |
| tree | bba8fa83ba6315eaad370d69fc03ca628627d9d9 /arch/x86/Kconfig | |
| parent | proc: Add /proc/<pid>/arch_status (diff) | |
| download | kernel-qcow2-linux-0c608dad2a771c0a11b6d12148d1a8b975e015d4.tar.gz kernel-qcow2-linux-0c608dad2a771c0a11b6d12148d1a8b975e015d4.tar.xz kernel-qcow2-linux-0c608dad2a771c0a11b6d12148d1a8b975e015d4.zip | |
x86/process: Add AVX-512 usage elapsed time to /proc/pid/arch_status
AVX-512 components usage can result in turbo frequency drop. So it's useful
to expose AVX-512 usage elapsed time as a heuristic hint for user space job
schedulers to cluster the AVX-512 using tasks together.
Examples:
$ while [ 1 ]; do cat /proc/tid/arch_status | grep AVX512; sleep 1; done
AVX512_elapsed_ms: 4
AVX512_elapsed_ms: 8
AVX512_elapsed_ms: 4
This means that 4 milliseconds have elapsed since the tsks AVX512 usage was
detected when the task was scheduled out.
$ cat /proc/tid/arch_status | grep AVX512
AVX512_elapsed_ms: -1
'-1' indicates that no AVX512 usage was recorded for this task.
The time exposed is not necessarily accurate when the arch_status file is
read as the AVX512 usage is only evaluated when a task is scheduled
out. Accurate usage information can be obtained with performance counters.
[ tglx: Massaged changelog ]
Signed-off-by: Aubrey Li <aubrey.li@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: akpm@linux-foundation.org
Cc: peterz@infradead.org
Cc: hpa@zytor.com
Cc: ak@linux.intel.com
Cc: tim.c.chen@linux.intel.com
Cc: dave.hansen@intel.com
Cc: arjan@linux.intel.com
Cc: adobriyan@gmail.com
Cc: aubrey.li@intel.com
Cc: linux-api@vger.kernel.org
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Tim Chen <tim.c.chen@linux.intel.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Arjan van de Ven <arjan@linux.intel.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linux API <linux-api@vger.kernel.org>
Link: https://lkml.kernel.org/r/20190606012236.9391-2-aubrey.li@linux.intel.com
Diffstat (limited to 'arch/x86/Kconfig')
| -rw-r--r-- | arch/x86/Kconfig | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 2bbbd4d1ba31..8a49b4b03f6b 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -217,6 +217,7 @@ config X86 select USER_STACKTRACE_SUPPORT select VIRT_TO_BUS select X86_FEATURE_NAMES if PROC_FS + select PROC_PID_ARCH_STATUS if PROC_FS config INSTRUCTION_DECODER def_bool y |