linux-kernel - Re: [PATCH] hungtask: add filter kthread/check comm

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Message-Id: <20210522145127.5f56751f164df8af2d3f39fa@linux-foundation.org>
Date:   Sat, 22 May 2021 14:51:27 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     chenguanyou <chenguanyou9338@...il.com>
Cc:     linux-kernel@...r.kernel.org, keescook@...omium.org,
        mhocko@...e.com, lukas.bulwahn@...il.com, vbabka@...e.cz,
        gpiccoli@...onical.com, chenguanyou <chenguanyou@...omi.com>
Subject: Re: [PATCH] hungtask: add filter kthread/check comm

On Fri, 21 May 2021 21:25:44 +0800 chenguanyou <chenguanyou9338@...il.com> wrote:

> Some kernel threads are always in D state, when we enable hung_task,
> it will misjudge, we should skip these to narrow the scope.
> 
> exp mtk mobilephone:
> root            435   435      2       0      0 mtk_lpm_monitor_thread 0 D LPM-0
> root            436   436      2       0      0 mtk_lpm_monitor_thread 0 D LPM-1
> root            437   437      2       0      0 mtk_lpm_monitor_thread 0 D LPM-2
> root            438   438      2       0      0 mtk_lpm_monitor_thread 0 D LPM-3
> root            439   439      2       0      0 mtk_lpm_monitor_thread 0 D LPM-4
> root            440   440      2       0      0 mtk_lpm_monitor_thread 0 D LPM-5
> root            441   441      2       0      0 mtk_lpm_monitor_thread 0 D LPM-6
> root            442   442      2       0      0 mtk_lpm_monitor_thread 0 D LPM-7

Maybe convert these threads to use TASK_IDLE?