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@@ -2421,6 +2421,56 @@ static const struct file_operations tracing_readme_fops = {
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.read = tracing_readme_read,
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};
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+static ssize_t
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+tracing_saved_cmdlines_read(struct file *file, char __user *ubuf,
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+ size_t cnt, loff_t *ppos)
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+{
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+ char *buf_comm;
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+ char *file_buf;
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+ char *buf;
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+ int len = 0;
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+ int pid;
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+ int i;
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+
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+ file_buf = kmalloc(SAVED_CMDLINES*(16+TASK_COMM_LEN), GFP_KERNEL);
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+ if (!file_buf)
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+ return -ENOMEM;
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+
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+ buf_comm = kmalloc(TASK_COMM_LEN, GFP_KERNEL);
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+ if (!buf_comm) {
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+ kfree(file_buf);
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+ return -ENOMEM;
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+ }
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+
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+ buf = file_buf;
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+
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+ for (i = 0; i < SAVED_CMDLINES; i++) {
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+ int r;
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+
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+ pid = map_cmdline_to_pid[i];
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+ if (pid == -1 || pid == NO_CMDLINE_MAP)
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+ continue;
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+
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+ trace_find_cmdline(pid, buf_comm);
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+ r = sprintf(buf, "%d %s\n", pid, buf_comm);
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+ buf += r;
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+ len += r;
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+ }
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+
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+ len = simple_read_from_buffer(ubuf, cnt, ppos,
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+ file_buf, len);
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+
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+ kfree(file_buf);
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+ kfree(buf_comm);
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+
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+ return len;
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+}
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+
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+static const struct file_operations tracing_saved_cmdlines_fops = {
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+ .open = tracing_open_generic,
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+ .read = tracing_saved_cmdlines_read,
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+};
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+
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static ssize_t
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tracing_ctrl_read(struct file *filp, char __user *ubuf,
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size_t cnt, loff_t *ppos)
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@@ -3973,6 +4023,9 @@ static __init int tracer_init_debugfs(void)
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trace_create_file("trace_marker", 0220, d_tracer,
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NULL, &tracing_mark_fops);
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+ trace_create_file("saved_cmdlines", 0444, d_tracer,
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+ NULL, &tracing_saved_cmdlines_fops);
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+
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#ifdef CONFIG_DYNAMIC_FTRACE
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trace_create_file("dyn_ftrace_total_info", 0444, d_tracer,
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&ftrace_update_tot_cnt, &tracing_dyn_info_fops);
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