[PATCH OLK-6.6 0/2] improve gettimeofday() performance in user space

4 Dec 2023


      Don't trap kernel to read the counter register, do this in userspace to
improve performance.

Yang Yingliang (2):
  arm64: arch_timer: Disable CNTVCT_EL0 trap if workaround is enabled
  vdso: do cntvct workaround in the VDSO

 arch/arm64/include/asm/vdso/gettimeofday.h | 30 ++++++++++++++++++++++
 drivers/clocksource/arm_arch_timer.c       | 20 ++++++++++++---
 include/linux/clocksource.h                |  2 ++
 include/vdso/datapage.h                    |  6 +++--
 kernel/time/vsyscall.c                     |  8 ++++++
 5 files changed, 61 insertions(+), 5 deletions(-)

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2.25.1