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fs/proc: add Kthread flag to /proc/$pid/status

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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`.

Link: https://lkml.kernel.org/r/20230416052404.2920-1-fullspring2018@gmail.com
Signed-off-by: Chunguang Wu <fullspring2018@gmail.com>
Reviewed-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Chunguang Wu
2023-04-16 13:24:04 +08:00
committed by Andrew Morton
parent 3647ebcfbf
commit 522dc4e5f5
2 changed files with 4 additions and 0 deletions
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2
fs/proc/array.c
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@@ -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,