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From: Ming Lei <ming.lei@redhat.com>
To: Christoph Hellwig <hch@lst.de>
Cc: Thomas Gleixner <tglx@linutronix.de>,
	Jens Axboe <axboe@kernel.dk>,
	"Martin K . Petersen" <martin.petersen@oracle.com>,
	linux-block@vger.kernel.org, linux-nvme@lists.infradead.org,
	linux-scsi@vger.kernel.org, Sagi Grimberg <sagi@grimberg.me>,
	Daniel Wagner <dwagner@suse.de>, Wen Xiong <wenxiong@us.ibm.com>,
	John Garry <john.garry@huawei.com>,
	Hannes Reinecke <hare@suse.de>, Keith Busch <kbusch@kernel.org>,
	Damien Le Moal <damien.lemoal@wdc.com>,
	"Michael S. Tsirkin" <mst@redhat.com>,
	Jason Wang <jasowang@redhat.com>,
	virtualization@lists.linux-foundation.org
Subject: Re: [PATCH V2 5/6] virtio: add one field into virtio_device for recording if device uses managed irq
Date: Thu, 8 Jul 2021 14:34:59 +0800	[thread overview]
Message-ID: <YOack2zlRnGmjWWz@T590> (raw)
In-Reply-To: <20210707140529.GA24637@lst.de>

On Wed, Jul 07, 2021 at 04:05:29PM +0200, Christoph Hellwig wrote:
> On Wed, Jul 07, 2021 at 05:42:54PM +0800, Ming Lei wrote:
> > The problem is that how blk-mq looks at that flag, since the device
> > representing the controller which allocates irq vectors isn't visible
> > to blk-mq.
> 
> In blk_mq_pci_map_queues and similar helpers.

Firstly it depends if drivers call into these helpers, so this way
is fragile.

Secondly, I think it isn't good to expose specific physical devices
into blk-mq which shouldn't deal with physical device directly, also
all the three helpers just duplicates same logic except for retrieving
each vector's affinity from specific physical device.

I will think about how to cleanup them.


Thanks,
Ming


  reply	other threads:[~2021-07-08  6:35 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-02 15:05 [PATCH V2 0/6] blk-mq: fix blk_mq_alloc_request_hctx Ming Lei
2021-07-02 15:05 ` [PATCH V2 1/6] blk-mq: prepare for not deactivating hctx if managed irq isn't used Ming Lei
2021-07-02 15:05 ` [PATCH V2 2/6] nvme: pci: pass BLK_MQ_F_MANAGED_IRQ to blk-mq Ming Lei
2021-07-02 15:05 ` [PATCH V2 3/6] scsi: add flag of .use_managed_irq to 'struct Scsi_Host' Ming Lei
2021-07-05  9:25   ` John Garry
2021-07-05  9:55     ` Ming Lei
2021-07-06  5:37       ` Christoph Hellwig
2021-07-06  7:41         ` Ming Lei
2021-07-06 10:32           ` Hannes Reinecke
2021-07-07 10:53             ` Ming Lei
2021-07-02 15:05 ` [PATCH V2 4/6] scsi: set shost->use_managed_irq if driver uses managed irq Ming Lei
2021-07-05  7:35   ` John Garry
2021-07-06  5:38   ` Christoph Hellwig
2021-07-02 15:05 ` [PATCH V2 5/6] virtio: add one field into virtio_device for recording if device " Ming Lei
2021-07-02 15:55   ` Michael S. Tsirkin
2021-07-05  2:48     ` Ming Lei
2021-07-05  3:59   ` Jason Wang
2021-07-06  5:42   ` Christoph Hellwig
2021-07-06  7:53     ` Ming Lei
2021-07-07  9:06     ` Thomas Gleixner
2021-07-07  9:42       ` Ming Lei
2021-07-07 14:05         ` Christoph Hellwig
2021-07-08  6:34           ` Ming Lei [this message]
2021-07-02 15:05 ` [PATCH V2 6/6] blk-mq: don't deactivate hctx if managed irq isn't used Ming Lei

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