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From: Ming Lei <ming.lei@redhat.com>
To: Nitesh Narayan Lal <nitesh@redhat.com>
Cc: linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org,
	intel-wired-lan@lists.osuosl.org, netdev@vger.kernel.org,
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	Tushar.Khandelwal@arm.com, kuba@kernel.org
Subject: Re: [PATCH v5 01/14] genirq: Provide new interfaces for affinity hints
Date: Fri, 6 Aug 2021 23:51:58 +0800	[thread overview]
Message-ID: <CAFj5m9+9asdQOCRHb0tZ=XSD-sOj+RLEDVEAObN81Z9y1JcgQg@mail.gmail.com> (raw)
In-Reply-To: <20210720232624.1493424-2-nitesh@redhat.com>

On Wed, Jul 21, 2021 at 7:26 AM Nitesh Narayan Lal <nitesh@redhat.com> wrote:
>
> From: Thomas Gleixner <tglx@linutronix.de>
>
> The discussion about removing the side effect of irq_set_affinity_hint() of
> actually applying the cpumask (if not NULL) as affinity to the interrupt,
> unearthed a few unpleasantries:
>
>   1) The modular perf drivers rely on the current behaviour for the very
>      wrong reasons.
>
>   2) While none of the other drivers prevents user space from changing
>      the affinity, a cursorily inspection shows that there are at least
>      expectations in some drivers.
>
> #1 needs to be cleaned up anyway, so that's not a problem
>
> #2 might result in subtle regressions especially when irqbalanced (which
>    nowadays ignores the affinity hint) is disabled.
>
> Provide new interfaces:
>
>   irq_update_affinity_hint()  - Only sets the affinity hint pointer
>   irq_set_affinity_and_hint() - Set the pointer and apply the affinity to
>                                 the interrupt
>
> Make irq_set_affinity_hint() a wrapper around irq_apply_affinity_hint() and
> document it to be phased out.
>
> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
> Signed-off-by: Nitesh Narayan Lal <nitesh@redhat.com>
> Link: https://lore.kernel.org/r/20210501021832.743094-1-jesse.brandeburg@intel.com

Reviewed-by: Ming Lei <ming.lei@redhat.com>


  reply	other threads:[~2021-08-06 15:52 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-20 23:26 [PATCH v5 00/14] genirq: Cleanup the abuse of irq_set_affinity_hint() Nitesh Narayan Lal
2021-07-20 23:26 ` [PATCH v5 01/14] genirq: Provide new interfaces for affinity hints Nitesh Narayan Lal
2021-08-06 15:51   ` Ming Lei [this message]
2021-07-20 23:26 ` [PATCH v5 02/14] iavf: Use irq_update_affinity_hint Nitesh Narayan Lal
2021-07-20 23:26 ` [PATCH v5 03/14] i40e: " Nitesh Narayan Lal
2021-07-20 23:26 ` [PATCH v5 04/14] scsi: megaraid_sas: Use irq_set_affinity_and_hint Nitesh Narayan Lal
2021-08-06 11:31   ` Sumit Saxena
2021-07-20 23:26 ` [PATCH v5 05/14] scsi: mpt3sas: " Nitesh Narayan Lal
2021-08-06  8:54   ` Sreekanth Reddy
2021-07-20 23:26 ` [PATCH v5 06/14] RDMA/irdma: Use irq_update_affinity_hint Nitesh Narayan Lal
2021-07-22 18:25   ` Nikolova, Tatyana E
2021-07-20 23:26 ` [PATCH v5 07/14] enic: " Nitesh Narayan Lal
2021-08-16 17:53   ` Christian Benvenuti (benve)
2021-07-20 23:26 ` [PATCH v5 08/14] be2net: " Nitesh Narayan Lal
2021-07-20 23:26 ` [PATCH v5 09/14] ixgbe: " Nitesh Narayan Lal
2021-07-20 23:26 ` [PATCH v5 10/14] mailbox: " Nitesh Narayan Lal
2021-08-16 18:11   ` Jassi Brar
2021-07-20 23:26 ` [PATCH v5 11/14] scsi: lpfc: Use irq_set_affinity Nitesh Narayan Lal
2021-07-23 17:15   ` James Smart
2021-07-20 23:26 ` [PATCH v5 12/14] hinic: Use irq_set_affinity_and_hint Nitesh Narayan Lal
2021-07-20 23:26 ` [PATCH v5 13/14] net/mlx5: " Nitesh Narayan Lal
2021-07-20 23:26 ` [PATCH v5 14/14] net/mlx4: Use irq_update_affinity_hint Nitesh Narayan Lal
2021-08-02 15:26 ` [PATCH v5 00/14] genirq: Cleanup the abuse of irq_set_affinity_hint() Nitesh Lal
2021-08-06  3:04   ` Martin K. Petersen
2021-08-06 14:56     ` Nitesh Lal
2021-08-16 15:50   ` Nitesh Lal
2021-08-30 15:38     ` Nitesh Lal
2021-08-30 15:40       ` Nitesh Lal

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