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Subject: Re: [Patch v4 1/3] lib: Restrict cpumask_local_spread to houskeeping
 CPUs
To:     Andrew Morton <akpm@linux-foundation.org>, peterz@infradead.org
Cc:     linux-kernel@vger.kernel.org, linux-api@vger.kernel.org,
        frederic@kernel.org, mtosatti@redhat.com, juri.lelli@redhat.com,
        abelits@marvell.com, bhelgaas@google.com,
        linux-pci@vger.kernel.org, rostedt@goodmis.org, mingo@kernel.org,
        tglx@linutronix.de, davem@davemloft.net, sfr@canb.auug.org.au,
        stephen@networkplumber.org, rppt@linux.vnet.ibm.com,
        jinyuqi@huawei.com, zhangshaokun@hisilicon.com
References: <20200625223443.2684-1-nitesh@redhat.com>
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From:   Nitesh Narayan Lal <nitesh@redhat.com>
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Message-ID: <efd99d48-39c7-be65-039d-524e63a80ed1@redhat.com>
Date:   Tue, 30 Jun 2020 20:47:32 -0400
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On 6/30/20 8:32 PM, Andrew Morton wrote:
> On Mon, 29 Jun 2020 12:11:25 -0400 Nitesh Narayan Lal <nitesh@redhat.com>=
 wrote:
>
>> On 6/25/20 6:34 PM, Nitesh Narayan Lal wrote:
>>> From: Alex Belits <abelits@marvell.com>
>>>
>>> The current implementation of cpumask_local_spread() does not respect t=
he
>>> 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@marvell.com>
>>> Signed-off-by: Nitesh Narayan Lal <nitesh@redhat.com>
>> Hi Peter,
>>
>> I just realized that Yuqi jin's patch [1] that modifies cpumask_local_sp=
read 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-zhangshaok=
un@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.

--=20
Thanks
Nitesh


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