From: Rafael Aquini <aquini@redhat.com>
To: Joel Savitz <jsavitz@redhat.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2] mm/oom_killer: Add task UID to info message on an oom kill
Date: Fri, 26 Apr 2019 21:15:45 -0400 [thread overview]
Message-ID: <20190427011545.GA10398@x230.aquini.net> (raw)
In-Reply-To: <1556305197-1600-1-git-send-email-jsavitz@redhat.com>
On Fri, Apr 26, 2019 at 02:59:57PM -0400, Joel Savitz wrote:
> 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
>
> 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
>
Acked-by: Rafael Aquini <aquini@redhat.com>
prev parent reply other threads:[~2019-04-27 1:15 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-26 18:59 [PATCH v2] mm/oom_killer: Add task UID to info message on an oom kill Joel Savitz
2019-04-27 1:15 ` Rafael Aquini [this message]
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