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The 'running' variable is only used in the P4 PMU. Current perf sets the variable in the critical function x86_pmu_start(), which wastes cycles for everybody not running on P4. Move cpuc->running into the P4 specific p4_pmu_enable_event(). Add a static per-CPU 'p4_running' variable to replace the 'running' variable in the struct cpu_hw_events. Saves space for the generic structure. The p4_pmu_enable_all() also invokes the p4_pmu_enable_event(), but it should not set cpuc->running. Factor out __p4_pmu_enable_event() for p4_pmu_enable_all(). Suggested-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Kan Liang <kan.liang@linux.intel.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lkml.kernel.org/r/1618410990-21383-1-git-send-email-kan.liang@linux.intel.com |
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