linux

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Thomas Gleixner 3e89bf35eb x86/vdso: Move cycle_last handling into the caller

Dereferencing gtod->cycle_last all over the place and foing the cycles <
last comparison in the vclock read functions generates horrible code. Doing
it at the call site is much better and gains a few cycles both for TSC and
pvclock.

Caveat: This adds the comparison to the hyperv vclock as well, but I have
no way to test that.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Andy Lutomirski <luto@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Matt Rickard <matt@softrans.com.au>
Cc: Stephen Boyd <sboyd@kernel.org>
Cc: John Stultz <john.stultz@linaro.org>
Cc: Florian Weimer <fweimer@redhat.com>
Cc: "K. Y. Srinivasan" <kys@microsoft.com>
Cc: Vitaly Kuznetsov <vkuznets@redhat.com>
Cc: devel@linuxdriverproject.org
Cc: virtualization@lists.linux-foundation.org
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Juergen Gross <jgross@suse.com>
Link: https://lkml.kernel.org/r/20180917130707.741440803@linutronix.de

2018-10-04 23:00:27 +02:00

syscalls

x86: Wire up restartable sequence system call

2018-06-06 11:58:32 +02:00

vdso

x86/vdso: Move cycle_last handling into the caller

2018-10-04 23:00:27 +02:00

vsyscall

x86/vdso: Introduce and use vgtod_ts

2018-10-04 23:00:25 +02:00

calling.h

syscalls/x86: Extend register clearing on syscall entry to lower registers