ftrace: show virtual PID
Impact: fix PID output under namespaces When current namespace is not the global namespace, pid read from set_ftrace_pid is no correct. # ~/newpid_namespace_run bash # echo $$ 1 # echo 1 > set_ftrace_pid # cat set_ftrace_pid 3756 Since we write virtual PID to set_ftrace_pid, we need get virtual PID when we read it. Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Cc: Steven Rostedt <srostedt@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <49C84D65.9050606@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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@ -2264,7 +2264,7 @@ ftrace_pid_read(struct file *file, char __user *ubuf,
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if (ftrace_pid_trace == ftrace_swapper_pid)
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r = sprintf(buf, "swapper tasks\n");
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else if (ftrace_pid_trace)
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r = sprintf(buf, "%u\n", pid_nr(ftrace_pid_trace));
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r = sprintf(buf, "%u\n", pid_vnr(ftrace_pid_trace));
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else
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r = sprintf(buf, "no pid\n");
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