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kernel/trace/trace_selftest.c
26.6 KB
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/* Include in trace.c */ |
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#include <linux/stringify.h> |
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#include <linux/kthread.h> |
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#include <linux/delay.h> |
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#include <linux/slab.h> |
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|
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static inline int trace_valid_entry(struct trace_entry *entry) |
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{ switch (entry->type) { case TRACE_FN: case TRACE_CTX: |
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case TRACE_WAKE: |
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case TRACE_STACK: |
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case TRACE_PRINT: |
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case TRACE_BRANCH: |
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case TRACE_GRAPH_ENT: case TRACE_GRAPH_RET: |
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return 1; } return 0; } |
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static int trace_test_buffer_cpu(struct trace_buffer *buf, int cpu) |
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{ |
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struct ring_buffer_event *event; struct trace_entry *entry; |
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unsigned int loops = 0; |
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|
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while ((event = ring_buffer_consume(buf->buffer, cpu, NULL, NULL))) { |
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entry = ring_buffer_event_data(event); |
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|
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/* * The ring buffer is a size of trace_buf_size, if * we loop more than the size, there's something wrong * with the ring buffer. */ if (loops++ > trace_buf_size) { printk(KERN_CONT ".. bad ring buffer "); goto failed; } |
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if (!trace_valid_entry(entry)) { |
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printk(KERN_CONT ".. invalid entry %d ", |
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entry->type); |
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goto failed; } |
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} |
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return 0; failed: |
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/* disable tracing */ tracing_disabled = 1; |
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printk(KERN_CONT ".. corrupted trace buffer .. "); return -1; } /* * Test the trace buffer to see if all the elements * are still sane. */ |
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static int trace_test_buffer(struct trace_buffer *buf, unsigned long *count) |
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{ |
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unsigned long flags, cnt = 0; int cpu, ret = 0; |
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|
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/* Don't allow flipping of max traces now */ |
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local_irq_save(flags); |
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arch_spin_lock(&buf->tr->max_lock); |
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|
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cnt = ring_buffer_entries(buf->buffer); |
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/* * The trace_test_buffer_cpu runs a while loop to consume all data. * If the calling tracer is broken, and is constantly filling * the buffer, this will run forever, and hard lock the box. * We disable the ring buffer while we do this test to prevent * a hard lock up. */ tracing_off(); |
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for_each_possible_cpu(cpu) { |
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ret = trace_test_buffer_cpu(buf, cpu); |
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if (ret) break; } |
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tracing_on(); |
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arch_spin_unlock(&buf->tr->max_lock); |
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local_irq_restore(flags); |
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if (count) *count = cnt; return ret; } |
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static inline void warn_failed_init_tracer(struct tracer *trace, int init_ret) { printk(KERN_WARNING "Failed to init %s tracer, init returned %d ", trace->name, init_ret); } |
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#ifdef CONFIG_FUNCTION_TRACER |
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#ifdef CONFIG_DYNAMIC_FTRACE |
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static int trace_selftest_test_probe1_cnt; static void trace_selftest_test_probe1_func(unsigned long ip, |
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unsigned long pip, |
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struct ftrace_ops *op, struct pt_regs *pt_regs) |
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{ trace_selftest_test_probe1_cnt++; } static int trace_selftest_test_probe2_cnt; static void trace_selftest_test_probe2_func(unsigned long ip, |
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unsigned long pip, |
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struct ftrace_ops *op, struct pt_regs *pt_regs) |
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{ trace_selftest_test_probe2_cnt++; } static int trace_selftest_test_probe3_cnt; static void trace_selftest_test_probe3_func(unsigned long ip, |
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unsigned long pip, |
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struct ftrace_ops *op, struct pt_regs *pt_regs) |
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{ trace_selftest_test_probe3_cnt++; } static int trace_selftest_test_global_cnt; static void trace_selftest_test_global_func(unsigned long ip, |
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unsigned long pip, |
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struct ftrace_ops *op, struct pt_regs *pt_regs) |
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{ trace_selftest_test_global_cnt++; } static int trace_selftest_test_dyn_cnt; static void trace_selftest_test_dyn_func(unsigned long ip, |
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unsigned long pip, |
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struct ftrace_ops *op, struct pt_regs *pt_regs) |
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{ trace_selftest_test_dyn_cnt++; } static struct ftrace_ops test_probe1 = { .func = trace_selftest_test_probe1_func, |
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.flags = FTRACE_OPS_FL_RECURSION_SAFE, |
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}; static struct ftrace_ops test_probe2 = { .func = trace_selftest_test_probe2_func, |
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.flags = FTRACE_OPS_FL_RECURSION_SAFE, |
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}; static struct ftrace_ops test_probe3 = { .func = trace_selftest_test_probe3_func, |
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.flags = FTRACE_OPS_FL_RECURSION_SAFE, |
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}; |
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static void print_counts(void) { printk("(%d %d %d %d %d) ", trace_selftest_test_probe1_cnt, trace_selftest_test_probe2_cnt, trace_selftest_test_probe3_cnt, trace_selftest_test_global_cnt, trace_selftest_test_dyn_cnt); } static void reset_counts(void) { trace_selftest_test_probe1_cnt = 0; trace_selftest_test_probe2_cnt = 0; trace_selftest_test_probe3_cnt = 0; trace_selftest_test_global_cnt = 0; trace_selftest_test_dyn_cnt = 0; } |
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static int trace_selftest_ops(struct trace_array *tr, int cnt) |
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{ int save_ftrace_enabled = ftrace_enabled; struct ftrace_ops *dyn_ops; char *func1_name; char *func2_name; int len1; int len2; int ret = -1; printk(KERN_CONT "PASSED "); pr_info("Testing dynamic ftrace ops #%d: ", cnt); ftrace_enabled = 1; reset_counts(); /* Handle PPC64 '.' name */ func1_name = "*" __stringify(DYN_FTRACE_TEST_NAME); func2_name = "*" __stringify(DYN_FTRACE_TEST_NAME2); len1 = strlen(func1_name); len2 = strlen(func2_name); /* * Probe 1 will trace function 1. * Probe 2 will trace function 2. * Probe 3 will trace functions 1 and 2. */ ftrace_set_filter(&test_probe1, func1_name, len1, 1); ftrace_set_filter(&test_probe2, func2_name, len2, 1); ftrace_set_filter(&test_probe3, func1_name, len1, 1); ftrace_set_filter(&test_probe3, func2_name, len2, 0); register_ftrace_function(&test_probe1); register_ftrace_function(&test_probe2); register_ftrace_function(&test_probe3); |
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/* First time we are running with main function */ if (cnt > 1) { ftrace_init_array_ops(tr, trace_selftest_test_global_func); register_ftrace_function(tr->ops); } |
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DYN_FTRACE_TEST_NAME(); print_counts(); if (trace_selftest_test_probe1_cnt != 1) goto out; if (trace_selftest_test_probe2_cnt != 0) goto out; if (trace_selftest_test_probe3_cnt != 1) goto out; |
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if (cnt > 1) { if (trace_selftest_test_global_cnt == 0) goto out; } |
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DYN_FTRACE_TEST_NAME2(); print_counts(); if (trace_selftest_test_probe1_cnt != 1) goto out; if (trace_selftest_test_probe2_cnt != 1) goto out; if (trace_selftest_test_probe3_cnt != 2) goto out; /* Add a dynamic probe */ dyn_ops = kzalloc(sizeof(*dyn_ops), GFP_KERNEL); if (!dyn_ops) { printk("MEMORY ERROR "); goto out; } dyn_ops->func = trace_selftest_test_dyn_func; register_ftrace_function(dyn_ops); trace_selftest_test_global_cnt = 0; DYN_FTRACE_TEST_NAME(); print_counts(); if (trace_selftest_test_probe1_cnt != 2) goto out_free; if (trace_selftest_test_probe2_cnt != 1) goto out_free; if (trace_selftest_test_probe3_cnt != 3) goto out_free; |
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if (cnt > 1) { if (trace_selftest_test_global_cnt == 0) goto out; } |
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if (trace_selftest_test_dyn_cnt == 0) goto out_free; DYN_FTRACE_TEST_NAME2(); print_counts(); if (trace_selftest_test_probe1_cnt != 2) goto out_free; if (trace_selftest_test_probe2_cnt != 2) goto out_free; if (trace_selftest_test_probe3_cnt != 4) goto out_free; ret = 0; out_free: unregister_ftrace_function(dyn_ops); kfree(dyn_ops); out: /* Purposely unregister in the same order */ unregister_ftrace_function(&test_probe1); unregister_ftrace_function(&test_probe2); unregister_ftrace_function(&test_probe3); |
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if (cnt > 1) unregister_ftrace_function(tr->ops); ftrace_reset_array_ops(tr); |
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/* Make sure everything is off */ reset_counts(); DYN_FTRACE_TEST_NAME(); DYN_FTRACE_TEST_NAME(); if (trace_selftest_test_probe1_cnt || trace_selftest_test_probe2_cnt || trace_selftest_test_probe3_cnt || trace_selftest_test_global_cnt || trace_selftest_test_dyn_cnt) ret = -1; ftrace_enabled = save_ftrace_enabled; return ret; } |
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/* Test dynamic code modification and ftrace filters */ |
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static int trace_selftest_startup_dynamic_tracing(struct tracer *trace, struct trace_array *tr, int (*func)(void)) |
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{ |
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int save_ftrace_enabled = ftrace_enabled; |
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unsigned long count; |
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char *func_name; |
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int ret; |
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/* The ftrace test PASSED */ printk(KERN_CONT "PASSED "); pr_info("Testing dynamic ftrace: "); /* enable tracing, and record the filter function */ ftrace_enabled = 1; |
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/* passed in by parameter to fool gcc from optimizing */ func(); |
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/* |
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* Some archs *cough*PowerPC*cough* add characters to the |
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* start of the function names. We simply put a '*' to |
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* accommodate them. |
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*/ |
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func_name = "*" __stringify(DYN_FTRACE_TEST_NAME); |
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|
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/* filter only on our function */ |
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ftrace_set_global_filter(func_name, strlen(func_name), 1); |
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/* enable tracing */ |
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ret = tracer_init(trace, tr); |
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if (ret) { warn_failed_init_tracer(trace, ret); goto out; } |
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|
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/* Sleep for a 1/10 of a second */ msleep(100); /* we should have nothing in the buffer */ |
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ret = trace_test_buffer(&tr->trace_buffer, &count); |
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if (ret) goto out; if (count) { ret = -1; printk(KERN_CONT ".. filter did not filter .. "); goto out; } /* call our function again */ func(); /* sleep again */ msleep(100); /* stop the tracing. */ |
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tracing_stop(); |
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ftrace_enabled = 0; /* check the trace buffer */ |
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ret = trace_test_buffer(&tr->trace_buffer, &count); |
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ftrace_enabled = 1; |
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tracing_start(); |
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/* we should only have one item */ if (!ret && count != 1) { |
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trace->reset(tr); |
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printk(KERN_CONT ".. filter failed count=%ld ..", count); |
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ret = -1; goto out; } |
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|
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/* Test the ops with global tracing running */ |
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ret = trace_selftest_ops(tr, 1); |
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trace->reset(tr); |
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out: ftrace_enabled = save_ftrace_enabled; |
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/* Enable tracing on all functions again */ |
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ftrace_set_global_filter(NULL, 0, 1); |
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|
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/* Test the ops with global tracing off */ if (!ret) |
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ret = trace_selftest_ops(tr, 2); |
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|
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return ret; } |
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static int trace_selftest_recursion_cnt; static void trace_selftest_test_recursion_func(unsigned long ip, unsigned long pip, struct ftrace_ops *op, struct pt_regs *pt_regs) { /* * This function is registered without the recursion safe flag. * The ftrace infrastructure should provide the recursion * protection. If not, this will crash the kernel! */ |
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if (trace_selftest_recursion_cnt++ > 10) return; |
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DYN_FTRACE_TEST_NAME(); } static void trace_selftest_test_recursion_safe_func(unsigned long ip, unsigned long pip, struct ftrace_ops *op, struct pt_regs *pt_regs) { /* * We said we would provide our own recursion. By calling * this function again, we should recurse back into this function * and count again. But this only happens if the arch supports * all of ftrace features and nothing else is using the function * tracing utility. */ if (trace_selftest_recursion_cnt++) return; DYN_FTRACE_TEST_NAME(); } static struct ftrace_ops test_rec_probe = { .func = trace_selftest_test_recursion_func, }; static struct ftrace_ops test_recsafe_probe = { .func = trace_selftest_test_recursion_safe_func, .flags = FTRACE_OPS_FL_RECURSION_SAFE, }; static int trace_selftest_function_recursion(void) { int save_ftrace_enabled = ftrace_enabled; |
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char *func_name; int len; int ret; |
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/* The previous test PASSED */ pr_cont("PASSED "); pr_info("Testing ftrace recursion: "); /* enable tracing, and record the filter function */ ftrace_enabled = 1; |
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/* Handle PPC64 '.' name */ func_name = "*" __stringify(DYN_FTRACE_TEST_NAME); len = strlen(func_name); ret = ftrace_set_filter(&test_rec_probe, func_name, len, 1); if (ret) { pr_cont("*Could not set filter* "); goto out; } ret = register_ftrace_function(&test_rec_probe); if (ret) { pr_cont("*could not register callback* "); goto out; } DYN_FTRACE_TEST_NAME(); unregister_ftrace_function(&test_rec_probe); ret = -1; if (trace_selftest_recursion_cnt != 1) { pr_cont("*callback not called once (%d)* ", trace_selftest_recursion_cnt); goto out; } trace_selftest_recursion_cnt = 1; pr_cont("PASSED "); pr_info("Testing ftrace recursion safe: "); ret = ftrace_set_filter(&test_recsafe_probe, func_name, len, 1); if (ret) { pr_cont("*Could not set filter* "); goto out; } ret = register_ftrace_function(&test_recsafe_probe); if (ret) { pr_cont("*could not register callback* "); goto out; } DYN_FTRACE_TEST_NAME(); unregister_ftrace_function(&test_recsafe_probe); |
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ret = -1; |
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if (trace_selftest_recursion_cnt != 2) { pr_cont("*callback not called expected 2 times (%d)* ", trace_selftest_recursion_cnt); |
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goto out; } ret = 0; out: ftrace_enabled = save_ftrace_enabled; |
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return ret; } |
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#else # define trace_selftest_startup_dynamic_tracing(trace, tr, func) ({ 0; }) |
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# define trace_selftest_function_recursion() ({ 0; }) |
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#endif /* CONFIG_DYNAMIC_FTRACE */ |
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|
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static enum { TRACE_SELFTEST_REGS_START, TRACE_SELFTEST_REGS_FOUND, TRACE_SELFTEST_REGS_NOT_FOUND, } trace_selftest_regs_stat; static void trace_selftest_test_regs_func(unsigned long ip, unsigned long pip, struct ftrace_ops *op, struct pt_regs *pt_regs) { if (pt_regs) trace_selftest_regs_stat = TRACE_SELFTEST_REGS_FOUND; else trace_selftest_regs_stat = TRACE_SELFTEST_REGS_NOT_FOUND; } static struct ftrace_ops test_regs_probe = { .func = trace_selftest_test_regs_func, .flags = FTRACE_OPS_FL_RECURSION_SAFE | FTRACE_OPS_FL_SAVE_REGS, }; static int trace_selftest_function_regs(void) { int save_ftrace_enabled = ftrace_enabled; |
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char *func_name; int len; int ret; int supported = 0; |
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#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS |
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supported = 1; #endif /* The previous test PASSED */ pr_cont("PASSED "); pr_info("Testing ftrace regs%s: ", !supported ? "(no arch support)" : ""); /* enable tracing, and record the filter function */ ftrace_enabled = 1; |
ad97772ad ftrace: Add selft... |
575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 |
/* Handle PPC64 '.' name */ func_name = "*" __stringify(DYN_FTRACE_TEST_NAME); len = strlen(func_name); ret = ftrace_set_filter(&test_regs_probe, func_name, len, 1); /* * If DYNAMIC_FTRACE is not set, then we just trace all functions. * This test really doesn't care. */ if (ret && ret != -ENODEV) { pr_cont("*Could not set filter* "); goto out; } ret = register_ftrace_function(&test_regs_probe); /* * Now if the arch does not support passing regs, then this should * have failed. */ if (!supported) { if (!ret) { pr_cont("*registered save-regs without arch support* "); goto out; } test_regs_probe.flags |= FTRACE_OPS_FL_SAVE_REGS_IF_SUPPORTED; ret = register_ftrace_function(&test_regs_probe); } if (ret) { pr_cont("*could not register callback* "); goto out; } DYN_FTRACE_TEST_NAME(); unregister_ftrace_function(&test_regs_probe); ret = -1; switch (trace_selftest_regs_stat) { case TRACE_SELFTEST_REGS_START: pr_cont("*callback never called* "); goto out; case TRACE_SELFTEST_REGS_FOUND: if (supported) break; pr_cont("*callback received regs without arch support* "); goto out; case TRACE_SELFTEST_REGS_NOT_FOUND: if (!supported) break; pr_cont("*callback received NULL regs* "); goto out; } ret = 0; out: ftrace_enabled = save_ftrace_enabled; |
ad97772ad ftrace: Add selft... |
636 637 638 |
return ret; } |
60a11774b ftrace: add self-... |
639 640 641 642 643 |
/* * Simple verification test of ftrace function tracer. * Enable ftrace, sleep 1/10 second, and then read the trace * buffer to see if all is in order. */ |
f1ed7c741 ftrace: Do not ru... |
644 |
__init int |
60a11774b ftrace: add self-... |
645 646 |
trace_selftest_startup_function(struct tracer *trace, struct trace_array *tr) { |
77a2b37d2 ftrace: startup t... |
647 |
int save_ftrace_enabled = ftrace_enabled; |
dd0e545f0 ftrace: printk fo... |
648 649 |
unsigned long count; int ret; |
60a11774b ftrace: add self-... |
650 |
|
f1ed7c741 ftrace: Do not ru... |
651 652 653 654 655 656 |
#ifdef CONFIG_DYNAMIC_FTRACE if (ftrace_filter_param) { printk(KERN_CONT " ... kernel command line filter set: force PASS ... "); return 0; } #endif |
77a2b37d2 ftrace: startup t... |
657 658 |
/* make sure msleep has been recorded */ msleep(1); |
60a11774b ftrace: add self-... |
659 |
/* start the tracing */ |
c7aafc549 ftrace: cleanups |
660 |
ftrace_enabled = 1; |
b6f11df26 trace: Call traci... |
661 |
ret = tracer_init(trace, tr); |
1c80025a4 tracing/ftrace: c... |
662 663 664 665 |
if (ret) { warn_failed_init_tracer(trace, ret); goto out; } |
60a11774b ftrace: add self-... |
666 667 668 |
/* Sleep for a 1/10 of a second */ msleep(100); /* stop the tracing. */ |
bbf5b1a0c ftrace: remove ct... |
669 |
tracing_stop(); |
c7aafc549 ftrace: cleanups |
670 |
ftrace_enabled = 0; |
60a11774b ftrace: add self-... |
671 |
/* check the trace buffer */ |
12883efb6 tracing: Consolid... |
672 |
ret = trace_test_buffer(&tr->trace_buffer, &count); |
3ddee63a0 ftrace: Only disa... |
673 674 |
ftrace_enabled = 1; |
60a11774b ftrace: add self-... |
675 |
trace->reset(tr); |
bbf5b1a0c ftrace: remove ct... |
676 |
tracing_start(); |
60a11774b ftrace: add self-... |
677 678 679 680 |
if (!ret && !count) { printk(KERN_CONT ".. no entries found .."); ret = -1; |
77a2b37d2 ftrace: startup t... |
681 |
goto out; |
60a11774b ftrace: add self-... |
682 |
} |
77a2b37d2 ftrace: startup t... |
683 684 |
ret = trace_selftest_startup_dynamic_tracing(trace, tr, DYN_FTRACE_TEST_NAME); |
ea701f11d ftrace: Add selft... |
685 686 |
if (ret) goto out; |
77a2b37d2 ftrace: startup t... |
687 |
|
ea701f11d ftrace: Add selft... |
688 |
ret = trace_selftest_function_recursion(); |
ad97772ad ftrace: Add selft... |
689 690 691 692 |
if (ret) goto out; ret = trace_selftest_function_regs(); |
77a2b37d2 ftrace: startup t... |
693 694 |
out: ftrace_enabled = save_ftrace_enabled; |
77a2b37d2 ftrace: startup t... |
695 |
|
4eebcc81a ftrace: disable t... |
696 697 698 |
/* kill ftrace totally if we failed */ if (ret) ftrace_kill(); |
60a11774b ftrace: add self-... |
699 700 |
return ret; } |
606576ce8 ftrace: rename FT... |
701 |
#endif /* CONFIG_FUNCTION_TRACER */ |
60a11774b ftrace: add self-... |
702 |
|
7447dce96 tracing/function-... |
703 704 |
#ifdef CONFIG_FUNCTION_GRAPH_TRACER |
cf586b61f tracing/function-... |
705 706 707 |
/* Maximum number of functions to trace before diagnosing a hang */ #define GRAPH_MAX_FUNC_TEST 100000000 |
cf586b61f tracing/function-... |
708 709 710 711 712 713 714 715 716 717 |
static unsigned int graph_hang_thresh; /* Wrap the real function entry probe to avoid possible hanging */ static int trace_graph_entry_watchdog(struct ftrace_graph_ent *trace) { /* This is harmlessly racy, we want to approximately detect a hang */ if (unlikely(++graph_hang_thresh > GRAPH_MAX_FUNC_TEST)) { ftrace_graph_stop(); printk(KERN_WARNING "BUG: Function graph tracer hang! "); |
7fe70b579 tracing: Fix ftra... |
718 719 720 721 722 |
if (ftrace_dump_on_oops) { ftrace_dump(DUMP_ALL); /* ftrace_dump() disables tracing */ tracing_on(); } |
cf586b61f tracing/function-... |
723 724 725 726 727 |
return 0; } return trace_graph_entry(trace); } |
7447dce96 tracing/function-... |
728 729 730 731 |
/* * Pretty much the same than for the function tracer from which the selftest * has been borrowed. */ |
f1ed7c741 ftrace: Do not ru... |
732 |
__init int |
7447dce96 tracing/function-... |
733 734 735 736 737 |
trace_selftest_startup_function_graph(struct tracer *trace, struct trace_array *tr) { int ret; unsigned long count; |
f1ed7c741 ftrace: Do not ru... |
738 739 740 741 742 743 |
#ifdef CONFIG_DYNAMIC_FTRACE if (ftrace_filter_param) { printk(KERN_CONT " ... kernel command line filter set: force PASS ... "); return 0; } #endif |
cf586b61f tracing/function-... |
744 745 746 747 |
/* * Simulate the init() callback but we attach a watchdog callback * to detect and recover from possible hangs */ |
12883efb6 tracing: Consolid... |
748 |
tracing_reset_online_cpus(&tr->trace_buffer); |
1a0799a8f tracing/function-... |
749 |
set_graph_array(tr); |
cf586b61f tracing/function-... |
750 751 |
ret = register_ftrace_graph(&trace_graph_return, &trace_graph_entry_watchdog); |
7447dce96 tracing/function-... |
752 753 754 755 |
if (ret) { warn_failed_init_tracer(trace, ret); goto out; } |
cf586b61f tracing/function-... |
756 |
tracing_start_cmdline_record(); |
7447dce96 tracing/function-... |
757 758 759 |
/* Sleep for a 1/10 of a second */ msleep(100); |
cf586b61f tracing/function-... |
760 761 |
/* Have we just recovered from a hang? */ if (graph_hang_thresh > GRAPH_MAX_FUNC_TEST) { |
0cf53ff62 tracing: keep the... |
762 |
tracing_selftest_disabled = true; |
cf586b61f tracing/function-... |
763 764 765 |
ret = -1; goto out; } |
7447dce96 tracing/function-... |
766 767 768 |
tracing_stop(); /* check the trace buffer */ |
12883efb6 tracing: Consolid... |
769 |
ret = trace_test_buffer(&tr->trace_buffer, &count); |
7447dce96 tracing/function-... |
770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 |
trace->reset(tr); tracing_start(); if (!ret && !count) { printk(KERN_CONT ".. no entries found .."); ret = -1; goto out; } /* Don't test dynamic tracing, the function tracer already did */ out: /* Stop it if we failed */ if (ret) ftrace_graph_stop(); return ret; } #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ |
60a11774b ftrace: add self-... |
790 791 792 793 |
#ifdef CONFIG_IRQSOFF_TRACER int trace_selftest_startup_irqsoff(struct tracer *trace, struct trace_array *tr) { |
6d9b3fa5e tracing: Move tra... |
794 |
unsigned long save_max = tr->max_latency; |
60a11774b ftrace: add self-... |
795 796 797 798 |
unsigned long count; int ret; /* start the tracing */ |
b6f11df26 trace: Call traci... |
799 |
ret = tracer_init(trace, tr); |
1c80025a4 tracing/ftrace: c... |
800 801 802 803 |
if (ret) { warn_failed_init_tracer(trace, ret); return ret; } |
60a11774b ftrace: add self-... |
804 |
/* reset the max latency */ |
6d9b3fa5e tracing: Move tra... |
805 |
tr->max_latency = 0; |
60a11774b ftrace: add self-... |
806 807 808 809 |
/* disable interrupts for a bit */ local_irq_disable(); udelay(100); local_irq_enable(); |
490362003 tracing/ftrace: s... |
810 811 812 813 814 815 816 817 |
/* * Stop the tracer to avoid a warning subsequent * to buffer flipping failure because tracing_stop() * disables the tr and max buffers, making flipping impossible * in case of parallels max irqs off latencies. */ trace->stop(tr); |
60a11774b ftrace: add self-... |
818 |
/* stop the tracing. */ |
bbf5b1a0c ftrace: remove ct... |
819 |
tracing_stop(); |
60a11774b ftrace: add self-... |
820 |
/* check both trace buffers */ |
12883efb6 tracing: Consolid... |
821 |
ret = trace_test_buffer(&tr->trace_buffer, NULL); |
60a11774b ftrace: add self-... |
822 |
if (!ret) |
12883efb6 tracing: Consolid... |
823 |
ret = trace_test_buffer(&tr->max_buffer, &count); |
60a11774b ftrace: add self-... |
824 |
trace->reset(tr); |
bbf5b1a0c ftrace: remove ct... |
825 |
tracing_start(); |
60a11774b ftrace: add self-... |
826 827 828 829 830 |
if (!ret && !count) { printk(KERN_CONT ".. no entries found .."); ret = -1; } |
6d9b3fa5e tracing: Move tra... |
831 |
tr->max_latency = save_max; |
60a11774b ftrace: add self-... |
832 833 834 835 836 837 838 839 840 |
return ret; } #endif /* CONFIG_IRQSOFF_TRACER */ #ifdef CONFIG_PREEMPT_TRACER int trace_selftest_startup_preemptoff(struct tracer *trace, struct trace_array *tr) { |
6d9b3fa5e tracing: Move tra... |
841 |
unsigned long save_max = tr->max_latency; |
60a11774b ftrace: add self-... |
842 843 |
unsigned long count; int ret; |
769c48eb2 ftrace: force pas... |
844 845 846 847 848 849 850 851 852 853 854 855 |
/* * Now that the big kernel lock is no longer preemptable, * and this is called with the BKL held, it will always * fail. If preemption is already disabled, simply * pass the test. When the BKL is removed, or becomes * preemptible again, we will once again test this, * so keep it in. */ if (preempt_count()) { printk(KERN_CONT "can not test ... force "); return 0; } |
60a11774b ftrace: add self-... |
856 |
/* start the tracing */ |
b6f11df26 trace: Call traci... |
857 |
ret = tracer_init(trace, tr); |
1c80025a4 tracing/ftrace: c... |
858 859 860 861 |
if (ret) { warn_failed_init_tracer(trace, ret); return ret; } |
60a11774b ftrace: add self-... |
862 |
/* reset the max latency */ |
6d9b3fa5e tracing: Move tra... |
863 |
tr->max_latency = 0; |
60a11774b ftrace: add self-... |
864 865 866 867 |
/* disable preemption for a bit */ preempt_disable(); udelay(100); preempt_enable(); |
490362003 tracing/ftrace: s... |
868 869 870 871 872 873 874 875 |
/* * Stop the tracer to avoid a warning subsequent * to buffer flipping failure because tracing_stop() * disables the tr and max buffers, making flipping impossible * in case of parallels max preempt off latencies. */ trace->stop(tr); |
60a11774b ftrace: add self-... |
876 |
/* stop the tracing. */ |
bbf5b1a0c ftrace: remove ct... |
877 |
tracing_stop(); |
60a11774b ftrace: add self-... |
878 |
/* check both trace buffers */ |
12883efb6 tracing: Consolid... |
879 |
ret = trace_test_buffer(&tr->trace_buffer, NULL); |
60a11774b ftrace: add self-... |
880 |
if (!ret) |
12883efb6 tracing: Consolid... |
881 |
ret = trace_test_buffer(&tr->max_buffer, &count); |
60a11774b ftrace: add self-... |
882 |
trace->reset(tr); |
bbf5b1a0c ftrace: remove ct... |
883 |
tracing_start(); |
60a11774b ftrace: add self-... |
884 885 886 887 888 |
if (!ret && !count) { printk(KERN_CONT ".. no entries found .."); ret = -1; } |
6d9b3fa5e tracing: Move tra... |
889 |
tr->max_latency = save_max; |
60a11774b ftrace: add self-... |
890 891 892 893 894 895 896 897 898 |
return ret; } #endif /* CONFIG_PREEMPT_TRACER */ #if defined(CONFIG_IRQSOFF_TRACER) && defined(CONFIG_PREEMPT_TRACER) int trace_selftest_startup_preemptirqsoff(struct tracer *trace, struct trace_array *tr) { |
6d9b3fa5e tracing: Move tra... |
899 |
unsigned long save_max = tr->max_latency; |
60a11774b ftrace: add self-... |
900 901 |
unsigned long count; int ret; |
769c48eb2 ftrace: force pas... |
902 903 904 905 906 907 908 909 910 911 912 913 |
/* * Now that the big kernel lock is no longer preemptable, * and this is called with the BKL held, it will always * fail. If preemption is already disabled, simply * pass the test. When the BKL is removed, or becomes * preemptible again, we will once again test this, * so keep it in. */ if (preempt_count()) { printk(KERN_CONT "can not test ... force "); return 0; } |
60a11774b ftrace: add self-... |
914 |
/* start the tracing */ |
b6f11df26 trace: Call traci... |
915 |
ret = tracer_init(trace, tr); |
1c80025a4 tracing/ftrace: c... |
916 917 |
if (ret) { warn_failed_init_tracer(trace, ret); |
ac1d52d0b tracing/ftrace: f... |
918 |
goto out_no_start; |
1c80025a4 tracing/ftrace: c... |
919 |
} |
60a11774b ftrace: add self-... |
920 921 |
/* reset the max latency */ |
6d9b3fa5e tracing: Move tra... |
922 |
tr->max_latency = 0; |
60a11774b ftrace: add self-... |
923 924 925 926 927 928 929 930 |
/* disable preemption and interrupts for a bit */ preempt_disable(); local_irq_disable(); udelay(100); preempt_enable(); /* reverse the order of preempt vs irqs */ local_irq_enable(); |
490362003 tracing/ftrace: s... |
931 932 933 934 935 936 937 |
/* * Stop the tracer to avoid a warning subsequent * to buffer flipping failure because tracing_stop() * disables the tr and max buffers, making flipping impossible * in case of parallels max irqs/preempt off latencies. */ trace->stop(tr); |
60a11774b ftrace: add self-... |
938 |
/* stop the tracing. */ |
bbf5b1a0c ftrace: remove ct... |
939 |
tracing_stop(); |
60a11774b ftrace: add self-... |
940 |
/* check both trace buffers */ |
12883efb6 tracing: Consolid... |
941 |
ret = trace_test_buffer(&tr->trace_buffer, NULL); |
ac1d52d0b tracing/ftrace: f... |
942 |
if (ret) |
60a11774b ftrace: add self-... |
943 |
goto out; |
12883efb6 tracing: Consolid... |
944 |
ret = trace_test_buffer(&tr->max_buffer, &count); |
ac1d52d0b tracing/ftrace: f... |
945 |
if (ret) |
60a11774b ftrace: add self-... |
946 947 948 949 950 951 952 953 954 |
goto out; if (!ret && !count) { printk(KERN_CONT ".. no entries found .."); ret = -1; goto out; } /* do the test by disabling interrupts first this time */ |
6d9b3fa5e tracing: Move tra... |
955 |
tr->max_latency = 0; |
bbf5b1a0c ftrace: remove ct... |
956 |
tracing_start(); |
490362003 tracing/ftrace: s... |
957 |
trace->start(tr); |
60a11774b ftrace: add self-... |
958 959 960 961 962 963 |
preempt_disable(); local_irq_disable(); udelay(100); preempt_enable(); /* reverse the order of preempt vs irqs */ local_irq_enable(); |
490362003 tracing/ftrace: s... |
964 |
trace->stop(tr); |
60a11774b ftrace: add self-... |
965 |
/* stop the tracing. */ |
bbf5b1a0c ftrace: remove ct... |
966 |
tracing_stop(); |
60a11774b ftrace: add self-... |
967 |
/* check both trace buffers */ |
12883efb6 tracing: Consolid... |
968 |
ret = trace_test_buffer(&tr->trace_buffer, NULL); |
60a11774b ftrace: add self-... |
969 970 |
if (ret) goto out; |
12883efb6 tracing: Consolid... |
971 |
ret = trace_test_buffer(&tr->max_buffer, &count); |
60a11774b ftrace: add self-... |
972 973 974 975 976 977 |
if (!ret && !count) { printk(KERN_CONT ".. no entries found .."); ret = -1; goto out; } |
ac1d52d0b tracing/ftrace: f... |
978 |
out: |
bbf5b1a0c ftrace: remove ct... |
979 |
tracing_start(); |
ac1d52d0b tracing/ftrace: f... |
980 981 |
out_no_start: trace->reset(tr); |
6d9b3fa5e tracing: Move tra... |
982 |
tr->max_latency = save_max; |
60a11774b ftrace: add self-... |
983 984 985 986 |
return ret; } #endif /* CONFIG_IRQSOFF_TRACER && CONFIG_PREEMPT_TRACER */ |
fb1b6d8b5 ftrace: add nop t... |
987 988 989 990 991 992 993 994 |
#ifdef CONFIG_NOP_TRACER int trace_selftest_startup_nop(struct tracer *trace, struct trace_array *tr) { /* What could possibly go wrong? */ return 0; } #endif |
60a11774b ftrace: add self-... |
995 |
#ifdef CONFIG_SCHED_TRACER |
addff1feb tracing: Clean up... |
996 997 998 999 1000 |
struct wakeup_test_data { struct completion is_ready; int go; }; |
60a11774b ftrace: add self-... |
1001 1002 |
static int trace_wakeup_test_thread(void *data) { |
af6ace764 sched/deadline: A... |
1003 1004 1005 1006 1007 1008 1009 |
/* Make this a -deadline thread */ static const struct sched_attr attr = { .sched_policy = SCHED_DEADLINE, .sched_runtime = 100000ULL, .sched_deadline = 10000000ULL, .sched_period = 10000000ULL }; |
addff1feb tracing: Clean up... |
1010 |
struct wakeup_test_data *x = data; |
60a11774b ftrace: add self-... |
1011 |
|
af6ace764 sched/deadline: A... |
1012 |
sched_setattr(current, &attr); |
60a11774b ftrace: add self-... |
1013 1014 |
/* Make it know we have a new prio */ |
addff1feb tracing: Clean up... |
1015 |
complete(&x->is_ready); |
60a11774b ftrace: add self-... |
1016 1017 1018 |
/* now go to sleep and let the test wake us up */ set_current_state(TASK_INTERRUPTIBLE); |
addff1feb tracing: Clean up... |
1019 1020 1021 1022 |
while (!x->go) { schedule(); set_current_state(TASK_INTERRUPTIBLE); } |
60a11774b ftrace: add self-... |
1023 |
|
addff1feb tracing: Clean up... |
1024 1025 1026 |
complete(&x->is_ready); set_current_state(TASK_INTERRUPTIBLE); |
3c18c10bd tracing: Fix wake... |
1027 |
|
60a11774b ftrace: add self-... |
1028 1029 |
/* we are awake, now wait to disappear */ while (!kthread_should_stop()) { |
addff1feb tracing: Clean up... |
1030 1031 |
schedule(); set_current_state(TASK_INTERRUPTIBLE); |
60a11774b ftrace: add self-... |
1032 |
} |
addff1feb tracing: Clean up... |
1033 |
__set_current_state(TASK_RUNNING); |
60a11774b ftrace: add self-... |
1034 1035 |
return 0; } |
60a11774b ftrace: add self-... |
1036 1037 1038 |
int trace_selftest_startup_wakeup(struct tracer *trace, struct trace_array *tr) { |
6d9b3fa5e tracing: Move tra... |
1039 |
unsigned long save_max = tr->max_latency; |
60a11774b ftrace: add self-... |
1040 |
struct task_struct *p; |
addff1feb tracing: Clean up... |
1041 |
struct wakeup_test_data data; |
60a11774b ftrace: add self-... |
1042 1043 |
unsigned long count; int ret; |
addff1feb tracing: Clean up... |
1044 1045 1046 |
memset(&data, 0, sizeof(data)); init_completion(&data.is_ready); |
60a11774b ftrace: add self-... |
1047 |
|
af6ace764 sched/deadline: A... |
1048 |
/* create a -deadline thread */ |
addff1feb tracing: Clean up... |
1049 |
p = kthread_run(trace_wakeup_test_thread, &data, "ftrace-test"); |
c7aafc549 ftrace: cleanups |
1050 |
if (IS_ERR(p)) { |
60a11774b ftrace: add self-... |
1051 1052 1053 |
printk(KERN_CONT "Failed to create ftrace wakeup test thread "); return -1; } |
af6ace764 sched/deadline: A... |
1054 |
/* make sure the thread is running at -deadline policy */ |
addff1feb tracing: Clean up... |
1055 |
wait_for_completion(&data.is_ready); |
60a11774b ftrace: add self-... |
1056 1057 |
/* start the tracing */ |
b6f11df26 trace: Call traci... |
1058 |
ret = tracer_init(trace, tr); |
1c80025a4 tracing/ftrace: c... |
1059 1060 1061 1062 |
if (ret) { warn_failed_init_tracer(trace, ret); return ret; } |
60a11774b ftrace: add self-... |
1063 |
/* reset the max latency */ |
6d9b3fa5e tracing: Move tra... |
1064 |
tr->max_latency = 0; |
60a11774b ftrace: add self-... |
1065 |
|
3c18c10bd tracing: Fix wake... |
1066 1067 |
while (p->on_rq) { /* |
af6ace764 sched/deadline: A... |
1068 |
* Sleep to make sure the -deadline thread is asleep too. |
3c18c10bd tracing: Fix wake... |
1069 1070 1071 1072 1073 |
* On virtual machines we can't rely on timings, * but we want to make sure this test still works. */ msleep(100); } |
60a11774b ftrace: add self-... |
1074 |
|
addff1feb tracing: Clean up... |
1075 1076 1077 1078 |
init_completion(&data.is_ready); data.go = 1; /* memory barrier is in the wake_up_process() */ |
60a11774b ftrace: add self-... |
1079 1080 |
wake_up_process(p); |
3c18c10bd tracing: Fix wake... |
1081 |
/* Wait for the task to wake up */ |
addff1feb tracing: Clean up... |
1082 |
wait_for_completion(&data.is_ready); |
5aa60c607 ftrace: give time... |
1083 |
|
60a11774b ftrace: add self-... |
1084 |
/* stop the tracing. */ |
bbf5b1a0c ftrace: remove ct... |
1085 |
tracing_stop(); |
60a11774b ftrace: add self-... |
1086 |
/* check both trace buffers */ |
12883efb6 tracing: Consolid... |
1087 |
ret = trace_test_buffer(&tr->trace_buffer, NULL); |
60a11774b ftrace: add self-... |
1088 |
if (!ret) |
12883efb6 tracing: Consolid... |
1089 |
ret = trace_test_buffer(&tr->max_buffer, &count); |
60a11774b ftrace: add self-... |
1090 1091 1092 |
trace->reset(tr); |
bbf5b1a0c ftrace: remove ct... |
1093 |
tracing_start(); |
60a11774b ftrace: add self-... |
1094 |
|
6d9b3fa5e tracing: Move tra... |
1095 |
tr->max_latency = save_max; |
60a11774b ftrace: add self-... |
1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 |
/* kill the thread */ kthread_stop(p); if (!ret && !count) { printk(KERN_CONT ".. no entries found .."); ret = -1; } return ret; } #endif /* CONFIG_SCHED_TRACER */ #ifdef CONFIG_CONTEXT_SWITCH_TRACER int trace_selftest_startup_sched_switch(struct tracer *trace, struct trace_array *tr) { unsigned long count; int ret; /* start the tracing */ |
b6f11df26 trace: Call traci... |
1117 |
ret = tracer_init(trace, tr); |
1c80025a4 tracing/ftrace: c... |
1118 1119 1120 1121 |
if (ret) { warn_failed_init_tracer(trace, ret); return ret; } |
60a11774b ftrace: add self-... |
1122 1123 1124 |
/* Sleep for a 1/10 of a second */ msleep(100); /* stop the tracing. */ |
bbf5b1a0c ftrace: remove ct... |
1125 |
tracing_stop(); |
60a11774b ftrace: add self-... |
1126 |
/* check the trace buffer */ |
12883efb6 tracing: Consolid... |
1127 |
ret = trace_test_buffer(&tr->trace_buffer, &count); |
60a11774b ftrace: add self-... |
1128 |
trace->reset(tr); |
bbf5b1a0c ftrace: remove ct... |
1129 |
tracing_start(); |
60a11774b ftrace: add self-... |
1130 1131 1132 1133 1134 1135 1136 1137 1138 |
if (!ret && !count) { printk(KERN_CONT ".. no entries found .."); ret = -1; } return ret; } #endif /* CONFIG_CONTEXT_SWITCH_TRACER */ |
a6dd24f8d ftrace: sysprof-p... |
1139 |
|
80e5ea450 ftrace: add trace... |
1140 1141 1142 1143 1144 1145 1146 1147 |
#ifdef CONFIG_BRANCH_TRACER int trace_selftest_startup_branch(struct tracer *trace, struct trace_array *tr) { unsigned long count; int ret; /* start the tracing */ |
b6f11df26 trace: Call traci... |
1148 |
ret = tracer_init(trace, tr); |
1c80025a4 tracing/ftrace: c... |
1149 1150 1151 1152 |
if (ret) { warn_failed_init_tracer(trace, ret); return ret; } |
80e5ea450 ftrace: add trace... |
1153 1154 1155 1156 1157 |
/* Sleep for a 1/10 of a second */ msleep(100); /* stop the tracing. */ tracing_stop(); /* check the trace buffer */ |
0184d50f9 tracing: Fix bad ... |
1158 |
ret = trace_test_buffer(&tr->trace_buffer, &count); |
80e5ea450 ftrace: add trace... |
1159 1160 |
trace->reset(tr); tracing_start(); |
d2ef7c2f0 tracing: fix the ... |
1161 1162 1163 1164 |
if (!ret && !count) { printk(KERN_CONT ".. no entries found .."); ret = -1; } |
80e5ea450 ftrace: add trace... |
1165 1166 1167 |
return ret; } #endif /* CONFIG_BRANCH_TRACER */ |
321bb5e1a x86, hw-branch-tr... |
1168 |