linux-kernel - Re: [Patch v4 1/3] lib: Restrict cpumask_local

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Message-ID: <87v9b66tho.fsf@nanos.tec.linutronix.de>
Date:   Fri, 05 Feb 2021 23:26:59 +0100
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Nitesh Narayan Lal <nitesh@...hat.com>,
        Marcelo Tosatti <mtosatti@...hat.com>
Cc:     Robin Murphy <robin.murphy@....com>, linux-kernel@...r.kernel.org,
        linux-api@...r.kernel.org, frederic@...nel.org,
        juri.lelli@...hat.com, abelits@...vell.com, bhelgaas@...gle.com,
        linux-pci@...r.kernel.org, rostedt@...dmis.org, mingo@...nel.org,
        peterz@...radead.org, davem@...emloft.net,
        akpm@...ux-foundation.org, sfr@...b.auug.org.au,
        stephen@...workplumber.org, rppt@...ux.vnet.ibm.com,
        jinyuqi@...wei.com, zhangshaokun@...ilicon.com
Subject: Re: [Patch v4 1/3] lib: Restrict cpumask_local_spread to houskeeping CPUs

On Fri, Feb 05 2021 at 23:23, Thomas Gleixner wrote:
> On Thu, Feb 04 2021 at 14:17, Nitesh Narayan Lal wrote:
>> On 2/4/21 2:06 PM, Marcelo Tosatti wrote:
>>>>> How about adding a new flag for isolcpus instead?
>>>>>
>>>> Do you mean a flag based on which we can switch the affinity mask to
>>>> housekeeping for all the devices at the time of IRQ distribution?
>>> Yes a new flag for isolcpus. HK_FLAG_IRQ_SPREAD or some better name.
>>
>> Does sounds like a nice idea to explore, lets see what Thomas thinks about it.

<.SNIP.>

> So I'm going to revert this commit because it _IS_ broken _AND_ useless
> and does not solve anything it claims to solve.

And no. HK_FLAG_IRQ_SPREAD is not going to solve anything either.

Thanks,

        tglx