Re: [PATCH v3 06/16] perf/core: Rework guest callbacks to prepare for static_call support
From: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Date: 2021-09-22 18:33:33
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On 9/21/21 8:05 PM, Sean Christopherson wrote:
From: Like Xu <redacted> To prepare for using static_calls to optimize perf's guest callbacks, replace ->is_in_guest and ->is_user_mode with a new multiplexed hook ->state, tweak ->handle_intel_pt_intr to play nice with being called when there is no active guest, and drop "guest" from ->is_in_guest. Return '0' from ->state and ->handle_intel_pt_intr to indicate "not in guest" so that DEFINE_STATIC_CALL_RET0 can be used to define the static calls, i.e. no callback == !guest. Suggested-by: Peter Zijlstra (Intel) <peterz@infradead.org> Originally-by: Peter Zijlstra (Intel) [off-list ref] Signed-off-by: Like Xu <redacted> Signed-off-by: Zhu Lingshan <redacted> [sean: extracted from static_call patch, fixed get_ip() bug, wrote changelog] Signed-off-by: Sean Christopherson <seanjc@google.com>
For Xen bits Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel