linux-kernel - [PATCH v3 0/2] x86/vdso: CLOCK_MONOTONIC

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Date:   Wed, 5 Jun 2019 14:41:41 +0000
From:   "Sverdlin, Alexander (Nokia - DE/Ulm)" <alexander.sverdlin@...ia.com>
To:     "x86@...nel.org" <x86@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     "Sverdlin, Alexander (Nokia - DE/Ulm)" <alexander.sverdlin@...ia.com>,
        Andy Lutomirski <luto@...nel.org>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Vas Dias <jason.vas.dias@...il.com>
Subject: [PATCH v3 0/2] x86/vdso: CLOCK_MONOTONIC_RAW implementation

From: Alexander Sverdlin <alexander.sverdlin@...ia.com>

Trivial vDSO implementation saves a syscall and brings 700% performance
boost of clock_gettime(CLOCK_MONOTONIC_RAW, ...) call.

Changelog:
v3: Move mult and shift into struct vgtod_ts
v2: copy do_hres() into do_monotonic_raw()

Alexander Sverdlin (2):
  x86/vdso: Move mult and shift into struct vgtod_ts
  x86/vdso: implement clock_gettime(CLOCK_MONOTONIC_RAW, ...)

 arch/x86/entry/vdso/vclock_gettime.c    |  4 ++--
 arch/x86/entry/vsyscall/vsyscall_gtod.c | 14 ++++++++++++--
 arch/x86/include/asm/vgtod.h            |  7 ++++---
 3 files changed, 18 insertions(+), 7 deletions(-)

-- 
2.4.6