linux-kernel - Re: [patch V2 07/15] powerpc/ps3: Convert half completion to rcuwait

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Message-ID: <20200319092107.6brm26peh3h2n4sk@linux-p48b>
Date:   Thu, 19 Mar 2020 02:21:07 -0700
From:   Davidlohr Bueso <dave@...olabs.net>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Ingo Molnar <mingo@...nel.org>, Will Deacon <will@...nel.org>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Joel Fernandes <joel@...lfernandes.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Arnd Bergmann <arnd@...db.de>, linuxppc-dev@...ts.ozlabs.org,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Logan Gunthorpe <logang@...tatee.com>,
        Kurt Schwemmer <kurt.schwemmer@...rosemi.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org,
        Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, Kalle Valo <kvalo@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        Oleg Nesterov <oleg@...hat.com>
Subject: Re: [patch V2 07/15] powerpc/ps3: Convert half completion to rcuwait

On Wed, 18 Mar 2020, Thomas Gleixner wrote:
>AFAICT the kthread uses TASK_INTERRUPTIBLE to not increase loadavg, kthreads
>cannot receive signals by default and this one doesn't look different. Use
>TASK_IDLE instead.

Hmm it seems in general this needs to be done kernel-wide. This kthread abuse of
TASK_INTERRUPTIBLE seems to be a common thing. There's also the users doing
schedule_timeout_interruptible()...

Thanks,
Davidlohr