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

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Date:   Tue, 30 Jun 2020 20:47:32 -0400
From:   Nitesh Narayan Lal <nitesh@...hat.com>
To:     Andrew Morton <akpm@...ux-foundation.org>, peterz@...radead.org
Cc:     linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
        frederic@...nel.org, mtosatti@...hat.com, juri.lelli@...hat.com,
        abelits@...vell.com, bhelgaas@...gle.com,
        linux-pci@...r.kernel.org, rostedt@...dmis.org, mingo@...nel.org,
        tglx@...utronix.de, davem@...emloft.net, 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 6/30/20 8:32 PM, Andrew Morton wrote:
> On Mon, 29 Jun 2020 12:11:25 -0400 Nitesh Narayan Lal <nitesh@...hat.com> wrote:
>
>> On 6/25/20 6:34 PM, Nitesh Narayan Lal wrote:
>>> From: Alex Belits <abelits@...vell.com>
>>>
>>> The current implementation of cpumask_local_spread() does not respect the
>>> isolated CPUs, i.e., even if a CPU has been isolated for Real-Time task,
>>> it will return it to the caller for pinning of its IRQ threads. Having
>>> these unwanted IRQ threads on an isolated CPU adds up to a latency
>>> overhead.
>>>
>>> Restrict the CPUs that are returned for spreading IRQs only to the
>>> available housekeeping CPUs.
>>>
>>> Signed-off-by: Alex Belits <abelits@...vell.com>
>>> Signed-off-by: Nitesh Narayan Lal <nitesh@...hat.com>
>> Hi Peter,
>>
>> I just realized that Yuqi jin's patch [1] that modifies cpumask_local_spread is
>> lying in linux-next.
>> Should I do a re-post by re-basing the patches on the top of linux-next?
>>
>> [1]
>> https://lore.kernel.org/lkml/1582768688-2314-1-git-send-email-zhangshaokun@hisilicon.com/
> This patch has had some review difficulties and has been pending for
> quite some time.  I suggest you base your work on mainline and that we
> ask Yuqi jin to rebase on that, if I don't feel confident doing it,
>

I see, in that case, it should be fine to go ahead with this patch-set as I
already based this on top of the latest master before posting.

-- 
Thanks
Nitesh



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