The patch titled
Subject: fs/proc: add Kthread flag to /proc/$pid/status
has been added to the -mm mm-nonmm-unstable branch. Its filename is
fs-proc-add-kthread-flag-to-proc-pid-status.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/fs-proc-add-kthread-flag-to-proc-pid-status.patch
This patch will later appear in the mm-nonmm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
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------------------------------------------------------
From: Chunguang Wu <fullspring2018@xxxxxxxxx>
Subject: fs/proc: add Kthread flag to /proc/$pid/status
Date: Sun, 16 Apr 2023 13:24:04 +0800
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@xxxxxxxxx
Signed-off-by: Chunguang Wu <fullspring2018@xxxxxxxxx>
Reviewed-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Cc: Alexey Dobriyan <adobriyan@xxxxxxxxx>
Cc: Jonathan Corbet <corbet@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/filesystems/proc.rst | 2 ++
fs/proc/array.c | 2 ++
2 files changed, 4 insertions(+)
--- a/Documentation/filesystems/proc.rst~fs-proc-add-kthread-flag-to-proc-pid-status
+++ a/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
--- a/fs/proc/array.c~fs-proc-add-kthread-flag-to-proc-pid-status
+++ a/fs/proc/array.c
@@ -219,6 +219,8 @@ static inline void task_state(struct seq
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,
_
Patches currently in -mm which might be from fullspring2018@xxxxxxxxx are
fs-proc-add-kthread-flag-to-proc-pid-status.patch
