Hi-- On 4/15/23 22:24, Chunguang Wu wrote: > The command `ps -ef ` and `top -c` mark kernel thread by '[' > and ']', but sometimes the result is not correct. > The task->flags in /proc/$pid/stat is good, but we need remember > the value of PF_KTHREAD is 0x00200000 and convert dec to hex. > If we have no binary program and shell script which read > /proc/$pid/stat, we can know it directly by > `cat /proc/$pid/status`. > > Signed-off-by: Chunguang Wu <fullspring2018@xxxxxxxxx> LGTM. Thanks. Reviewed-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx> > --- > Documentation/filesystems/proc.rst | 2 ++ > fs/proc/array.c | 2 ++ > 2 files changed, 4 insertions(+) > > diff --git a/Documentation/filesystems/proc.rst b/Documentation/filesystems/proc.rst > index 9d5fd9424e8b..8a563684586c 100644 > --- a/Documentation/filesystems/proc.rst > +++ b/Documentation/filesystems/proc.rst > @@ -179,6 +179,7 @@ read the file /proc/PID/status:: > Gid: 100 100 100 100 > FDSize: 256 > Groups: 100 14 16 > + Kthread: 0 > VmPeak: 5004 kB > VmSize: 5004 kB > VmLck: 0 kB > @@ -256,6 +257,7 @@ It's slow but very precise. > NSpid descendant namespace process ID hierarchy > NSpgid descendant namespace process group ID hierarchy > NSsid descendant namespace session ID hierarchy > + Kthread kernel thread flag, 1 is yes, 0 is no > VmPeak peak virtual memory size > VmSize total program size > VmLck locked memory size > diff --git a/fs/proc/array.c b/fs/proc/array.c > index 9b0315d34c58..425824ad85e1 100644 > --- a/fs/proc/array.c > +++ b/fs/proc/array.c > @@ -219,6 +219,8 @@ static inline void task_state(struct seq_file *m, struct pid_namespace *ns, > seq_put_decimal_ull(m, "\t", task_session_nr_ns(p, pid->numbers[g].ns)); > #endif > seq_putc(m, '\n'); > + > + seq_printf(m, "Kthread:\t%c\n", p->flags & PF_KTHREAD ? '1' : '0'); > } > > void render_sigset_t(struct seq_file *m, const char *header, -- ~Randy
