Re: [PATCH] scsi: avoid to run synchronize_rcu for each device in scsi_host_block

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To: Ming Lei <ming.lei@xxxxxxxxxx>, James Bottomley <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx>, linux-scsi@xxxxxxxxxxxxxxx, "Martin K . Petersen" <martin.petersen@xxxxxxxxxx>
Subject: Re: [PATCH] scsi: avoid to run synchronize_rcu for each device in scsi_host_block
From: Bart Van Assche <bvanassche@xxxxxxx>
Date: Wed, 22 Apr 2020 08:06:18 -0700
Cc: Christoph Hellwig <hch@xxxxxx>, Dexuan Cui <decui@xxxxxxxxxxxxx>, Hannes Reinecke <hare@xxxxxxx>
In-reply-to: <20200422101433.321581-1-ming.lei@redhat.com>
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.6.0

On 4/22/20 3:14 AM, Ming Lei wrote:

So use scsi_internal_device_block() to implement scsi_host_block(),
and just run once synchronize_rcu() because scsi never supports
tagset of BLK_MQ_F_BLOCKING.

Please add a reference to BLK_MQ_F_BLOCKING as a comment in the modifiedcode.


Thanks,

Bart.

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- [PATCH] scsi: avoid to run synchronize_rcu for each device in scsi_host_block
  - From: Ming Lei

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