linux-kernel - Re: [PATCH v2] kernel: add pid_max to pid

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Message-ID: <20241112173331.407a5be0@gandalf.local.home>
Date: Tue, 12 Nov 2024 17:33:31 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: Yun Zhou <yun.zhou@...driver.com>
Cc: <mcgrof@...nel.org>, <kees@...nel.org>, <joel.granados@...nel.org>,
 <mhiramat@...nel.org>, <mathieu.desnoyers@...icios.com>,
 <linux-kernel@...r.kernel.org>, <linux-fsdevel@...r.kernel.org>,
 <linux-trace-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] kernel: add pid_max to pid_namespace

On Tue, 5 Nov 2024 11:10:24 +0800
Yun Zhou <yun.zhou@...driver.com> wrote:

> It is necessary to have a different pid_max in different containers.
> For example, multiple containers are running on a host, one of which
> is Android, and its 32 bit bionic libc only accepts pid <= 65535. So
> it requires the global pid_max <= 65535. This will cause configuration
> conflicts with other containers and also limit the maximum number of
> tasks for the entire system.
> 
> Signed-off-by: Yun Zhou <yun.zhou@...driver.com>

Acked-by: Steven Rostedt (Google) <rostedt@...dmis.org>

-- Steve

> ---
>  - Remove sentinels from ctl_table arrays.
> v1 - https://lore.kernel.org/all/20241030052933.1041408-1-yun.zhou@windriver.com/
> ---
>  include/linux/pid_namespace.h     |  1 +
>  kernel/pid.c                      | 12 +++++------
>  kernel/pid_namespace.c            | 34 ++++++++++++++++++++++++++-----
>  kernel/sysctl.c                   |  9 --------
>  kernel/trace/pid_list.c           |  2 +-
>  kernel/trace/trace.h              |  2 --
>  kernel/trace/trace_sched_switch.c |  2 +-
>  7 files changed, 38 insertions(+), 24 deletions(-)