From: Vitaly Kuznetsov <vkuznets@redhat.com>
To: x86@kernel.org, Andy Lutomirski <luto@amacapital.net>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
"K. Y. Srinivasan" <kys@microsoft.com>,
Haiyang Zhang <haiyangz@microsoft.com>,
Stephen Hemminger <sthemmin@microsoft.com>,
Dexuan Cui <decui@microsoft.com>,
linux-kernel@vger.kernel.org, devel@linuxdriverproject.org,
virtualization@lists.linux-foundation.org
Subject: [PATCH 0/2] x86/vdso: Add Hyper-V TSC page clocksource support
Date: Thu, 9 Feb 2017 15:10:50 +0100 [thread overview]
Message-ID: <20170209141052.18694-1-vkuznets@redhat.com> (raw)
Hi,
Hyper-V TSC page clocksource is suitable for vDSO, however, the protocol
defined by the hypervisor is different from VCLOCK_PVCLOCK. Implemented the
required support. Simple sysbench test shows the following results:
Before:
# time sysbench --test=memory --max-requests=500000 run
...
real 1m22.618s
user 0m50.193s
sys 0m32.268s
After:
# time sysbench --test=memory --max-requests=500000 run
...
real 0m47.241s
user 0m47.117s
sys 0m0.008s
So it seems it is worth it. As nobody seems to be strongly offended by my RFC
I'm sending first non-RFC version. Patch 1 is made on top of K. Y.'s code
refactoring which moved tsc page clocksource to arch/x86/hyperv/hv_init.c,
this is currently present in Greg's char-misc-next tree.
Changes since RFC:
- Use mul_u64_u64_shr() instead of an open coded implementation
[Andy Lutomirski, Thomas Gleixner]
- Don't use the same pvclock_page for both VCLOCK_PVCLOCK and
VCLOCK_HVCLOCK, create another one [Andy Lutomirski]
- Fix issues reported by kbuild test robot.
- Rename HYPERV_CLOCK -> HYPERV_TSCPAGE to avoid the ambiguity.
I'm also going to try to optimize mul_u64_u64_shr() for 32bit but this can
be split from this series I guess.
Vitaly Kuznetsov (2):
hyperv: implement hv_get_tsc_page()
x86/vdso: Add VCLOCK_HVCLOCK vDSO clock read method
arch/x86/entry/vdso/vclock_gettime.c | 36 +++++++++++++++++++++++++++++++++++
arch/x86/entry/vdso/vdso-layout.lds.S | 3 ++-
arch/x86/entry/vdso/vdso2c.c | 3 +++
arch/x86/entry/vdso/vma.c | 7 +++++++
arch/x86/hyperv/hv_init.c | 12 ++++++++++--
arch/x86/include/asm/clocksource.h | 3 ++-
arch/x86/include/asm/mshyperv.h | 8 ++++++++
arch/x86/include/asm/vdso.h | 1 +
drivers/hv/Kconfig | 3 +++
9 files changed, 72 insertions(+), 4 deletions(-)
--
2.9.3
next reply other threads:[~2017-02-09 14:10 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-09 14:10 Vitaly Kuznetsov [this message]
2017-02-09 14:10 ` [PATCH 1/2] hyperv: implement hv_get_tsc_page() Vitaly Kuznetsov
2017-02-09 18:24 ` Stephen Hemminger
2017-02-09 20:14 ` Thomas Gleixner
2017-02-09 23:17 ` Stephen Hemminger
2017-02-09 14:10 ` [PATCH 2/2] x86/vdso: Add VCLOCK_HVCLOCK vDSO clock read method Vitaly Kuznetsov
2017-02-09 17:08 ` Thomas Gleixner
2017-02-09 18:27 ` Stephen Hemminger
2017-02-10 12:25 ` Vitaly Kuznetsov
2017-02-10 12:28 ` Thomas Gleixner
2017-02-10 16:31 ` Stephen Hemminger
2017-02-10 18:01 ` Thomas Gleixner
2017-02-13 7:49 ` Dexuan Cui
2017-02-13 9:27 ` Thomas Gleixner
2017-02-13 19:06 ` Andy Lutomirski
2017-02-13 19:28 ` Thomas Gleixner
2017-02-09 20:45 ` KY Srinivasan
2017-02-09 22:55 ` Andy Lutomirski
2017-02-09 23:15 ` Stephen Hemminger
2017-02-10 12:15 ` Vitaly Kuznetsov
2017-02-10 11:06 ` Vitaly Kuznetsov
2017-02-10 11:15 ` Thomas Gleixner
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