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The current perf tracks two timestamps for the normal ctx and cgroup. The same type of variables and similar codes are used to track the timestamps. In the following patch, the third timestamp to track the guest time will be introduced. To avoid the code duplication, add a new struct perf_time_ctx and factor out a generic function update_perf_time_ctx(). No functional change. Suggested-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Kan Liang <kan.liang@linux.intel.com> Signed-off-by: Mingwei Zhang <mizhang@google.com> Signed-off-by: Sean Christopherson <seanjc@google.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Tested-by: Xudong Hao <xudong.hao@intel.com> Link: https://patch.msgid.link/20251206001720.468579-6-seanjc@google.com