From: Chunguang Wu <fullspring2018@gmail.com>
To: akpm@linux-foundation.org, corbet@lwn.net
Cc: adobriyan@gmail.com, rdunlap@infradead.org,
linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
linux-doc@vger.kernel.org
Subject: [PATCH v2] fs/proc: add Kthread flag to /proc/$pid/status
Date: Sun, 16 Apr 2023 13:24:04 +0800 [thread overview]
Message-ID: <20230416052404.2920-1-fullspring2018@gmail.com> (raw)
The command `ps -ef ` and `top -c` mark kernel thread by '['
and ']', but sometimes the result is not correct.
The task->flags in /proc/$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@gmail.com>
---
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,
--
2.39.1
next reply other threads:[~2023-04-16 5:24 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-04-16 5:24 Chunguang Wu [this message]
2023-04-16 5:52 ` [PATCH v2] fs/proc: add Kthread flag to /proc/$pid/status Randy Dunlap
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