Messages in this thread | | | Date | Mon, 23 Sep 2019 22:43:04 +0200 (CEST) | From | Thomas Gleixner <> | Subject | Re: [RFC patch 02/15] x86/entry: Remove _TIF_NOHZ from _TIF_WORK_SYSCALL_ENTRY |
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On Fri, 20 Sep 2019, Andy Lutomirski wrote:
> On Thu, Sep 19, 2019 at 8:09 AM Thomas Gleixner <tglx@linutronix.de> wrote: > > > > Evaluating _TIF_NOHZ to decide whether to use the slow syscall entry path > > is not only pointless, it's actually counterproductive: > > > > 1) Context tracking code is invoked unconditionally before that flag is > > evaluated. > > > > 2) If the flag is set the slow path is invoked for nothing due to #1 > > Can we also get rid of TIF_NOHZ on x86?
If we make the usage in context_tracking_cpu_set() conditional.
Thanks,
tglx
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