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Diffstat (limited to 'source/module/monitor_perf.c')
| -rw-r--r-- | source/module/monitor_perf.c | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/source/module/monitor_perf.c b/source/module/monitor_perf.c new file mode 100644 index 0000000..549d7ac --- /dev/null +++ b/source/module/monitor_perf.c @@ -0,0 +1,102 @@ +#include "monitor_perf.h" + +static struct perf_event *pe; + +void vm_perf_overflow_callback(struct perf_event *event, + struct perf_sample_data *data, + struct pt_regs *regs) { + // handle perf event data + // struct perf_callchain_entry *callchain; + // int nr, i; + + pr_info("perf event callback\n"); + + // 如果 perf_sample_data 有调用堆栈信息 + // if (data->callchain) { + // callchain = data->callchain; + // nr = callchain->nr; // 调用堆栈的长度 + + // // 遍历堆栈条目并处理它们 + // for (i = 0; i < nr; i++) { + // // callchain->ip[i] 包含了堆栈的每个条目 + // // 在这里可以调用 to_buff 将堆栈信息写入缓冲区 + // // to_buff(&callchain->ip[i], sizeof(callchain->ip[i])); + // pr_info("callchain->ip[%d] = %llx\n", i, callchain->ip[i]); + // } + // } +} + +// static struct perf_event_attr pea = { +// .type = PERF_TYPE_SOFTWARE, // software event +// .size = sizeof(struct perf_event_attr), // size of attr +// .config = PERF_COUNT_SW_CPU_CLOCK, // no care +// PERF_COUNT_SW_DUMMY PERF_COUNT_SW_CPU_CLOCK .sample_period = 1, // sample +// every 1 event .sample_type = +// PERF_SAMPLE_CALLCHAIN, // sample callchain | means include stacktrace +// // .exclude_kernel = 1, // no kernel stacktrace | may need to change +// after test +// // .exclude_hv = 1, // no hypervisor stacktrace | may need to change +// after test .disabled = 0, // disabled at first +// }; + +struct perf_event_attr pea = { + .type = PERF_TYPE_SOFTWARE, + .size = sizeof(struct perf_event_attr), + .config = PERF_COUNT_SW_CPU_CLOCK, + .sample_period = 1, + .sample_type = PERF_SAMPLE_CALLCHAIN, + // .disabled = 1, +}; + +#include <linux/cpumask.h> +#include <linux/smp.h> +/** + * @brief Set the up perf event for task object + * + * @param tsk + */ +void setup_perf_event_for_task(struct task_struct *tsk) { + pr_info("setup_perf_event_for_task: cpu = %d\n", tsk->on_cpu); + if (pe) { + pr_info("Perf event already created\n"); + return; + } + int cpu; + struct perf_event **events; + for_each_possible_cpu(cpu) { + struct perf_event **event = per_cpu_ptr(events, cpu); + if (cpu_is_offline(cpu)) { + *event = NULL; + continue; + } + *event = perf_event_create_kernel_counter(&pea, cpu, tsk, + vm_perf_overflow_callback, NULL); + if (IS_ERR(*event)) { + printk(KERN_INFO "create perf event failure\n"); + // return -1; + } + } + + // pe = perf_event_create_kernel_counter(&pea, tsk->on_cpu, tsk, + // vm_perf_callback, NULL); + pe = perf_event_create_kernel_counter(&pea, tsk->on_cpu, tsk, + vm_perf_overflow_callback, NULL); + if (IS_ERR(pe)) { + pr_info("Error in perf_event_create_kernel_counter\n"); + return; + } + + // perf_event_enable(pe); // enable perf event +} + +/** + * @brief Disable perf event + * + */ +void cleanup_perf_event(void) { + if (pe) { + perf_event_disable(pe); + perf_event_release_kernel(pe); + pe = NULL; + } +}
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