Messages in this thread | | | Date | Fri, 13 Nov 2015 16:26:13 +0100 | From | Frederic Weisbecker <> | Subject | Re: [PATCH v3 5/5] x86/entry/64: Bypass enter_from_user_mode on non-context-tracking boots |
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On Thu, Nov 12, 2015 at 12:59:04PM -0800, Andy Lutomirski wrote: > On CONFIG_CONTEXT_TRACKING kernels that have context tracking > disabled at runtime (which includes most distro kernels), we still > have the overhead of a call to enter_from_user_mode in interrupt and > exception entries. > > If jump labels are available, this uses the jump label > infrastructure to skip the call.
Looks good. But why are we still calling context tracking code on IRQs at all?
Thanks.
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