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tracing: Add snapshot feature to instances
Add the "snapshot" file to the the multi-buffer instances. cd /sys/kernel/debug/tracing/instances mkdir foo ls foo buffer_size_kb buffer_total_size_kb events free_buffer set_event snapshot trace trace_clock trace_marker trace_options trace_pipe tracing_on cat foo/snapshot # tracer: nop # # # * Snapshot is freed * # # Snapshot commands: # echo 0 > snapshot : Clears and frees snapshot buffer # echo 1 > snapshot : Allocates snapshot buffer, if not already allocated. # Takes a snapshot of the main buffer. # echo 2 > snapshot : Clears snapshot buffer (but does not allocate) # (Doesn't have to be '2' works with any number that # is not a '0' or '1') Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
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@ -4302,9 +4302,9 @@ tracing_snapshot_write(struct file *filp, const char __user *ubuf, size_t cnt,
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local_irq_disable();
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/* Now, we're going to swap */
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if (iter->cpu_file == RING_BUFFER_ALL_CPUS)
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update_max_tr(&global_trace, current, smp_processor_id());
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update_max_tr(tr, current, smp_processor_id());
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else
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update_max_tr_single(&global_trace, current, iter->cpu_file);
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update_max_tr_single(tr, current, iter->cpu_file);
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local_irq_enable();
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break;
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default:
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@ -5533,6 +5533,11 @@ init_tracer_debugfs(struct trace_array *tr, struct dentry *d_tracer)
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trace_create_file("tracing_on", 0644, d_tracer,
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tr, &rb_simple_fops);
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#ifdef CONFIG_TRACER_SNAPSHOT
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trace_create_file("snapshot", 0644, d_tracer,
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(void *)&tr->trace_cpu, &snapshot_fops);
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#endif
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}
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static __init int tracer_init_debugfs(void)
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@ -5574,11 +5579,6 @@ static __init int tracer_init_debugfs(void)
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&ftrace_update_tot_cnt, &tracing_dyn_info_fops);
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#endif
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#ifdef CONFIG_TRACER_SNAPSHOT
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trace_create_file("snapshot", 0644, d_tracer,
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(void *)&global_trace.trace_cpu, &snapshot_fops);
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#endif
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create_trace_instances(d_tracer);
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create_trace_options_dir(&global_trace);
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