lkml.org 
[lkml]   [2019]   [Jun]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[RESEND PATCH v2] mm/oom_killer: Add task UID to info message on an oom kill
Date
In the event of an oom kill, useful information about the killed
process is printed to dmesg. Users, especially system administrators,
will find it useful to immediately see the UID of the process.

In the following example, abuse_the_ram is the name of a program
that attempts to iteratively allocate all available memory until it is
stopped by force.

Current message:

Out of memory: Killed process 35389 (abuse_the_ram)
total-vm:133718232kB, anon-rss:129624980kB, file-rss:0kB,
shmem-rss:0kB

Patched message:

Out of memory: Killed process 2739 (abuse_the_ram),
total-vm:133880028kB, anon-rss:129754836kB, file-rss:0kB,
shmem-rss:0kB, UID 0


Suggested-by: David Rientjes <rientjes@google.com>
Signed-off-by: Joel Savitz <jsavitz@redhat.com>
---
mm/oom_kill.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 3a2484884cfd..af2e3faa72a0 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -874,12 +874,13 @@ static void __oom_kill_process(struct task_struct *victim, const char *message)
*/
do_send_sig_info(SIGKILL, SEND_SIG_PRIV, victim, PIDTYPE_TGID);
mark_oom_victim(victim);
- pr_err("%s: Killed process %d (%s) total-vm:%lukB, anon-rss:%lukB, file-rss:%lukB, shmem-rss:%lukB\n",
+ pr_err("%s: Killed process %d (%s) total-vm:%lukB, anon-rss:%lukB, file-rss:%lukB, shmem-rss:%lukB, UID %d\n",
message, task_pid_nr(victim), victim->comm,
K(victim->mm->total_vm),
K(get_mm_counter(victim->mm, MM_ANONPAGES)),
K(get_mm_counter(victim->mm, MM_FILEPAGES)),
- K(get_mm_counter(victim->mm, MM_SHMEMPAGES)));
+ K(get_mm_counter(victim->mm, MM_SHMEMPAGES)),
+ from_kuid(&init_user_ns, task_uid(victim)));
task_unlock(victim);

/*
--
2.18.1
\
 
 \ /
  Last update: 2019-06-12 19:58    [W:0.041 / U:89.164 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site