linux-kernel - Re: [PATCH 1/3] virtio-crypto: fixup potential cpu stall when free unused bufs

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Date:   Sat, 10 Jun 2023 11:20:49 +0800
From:   Xianting Tian <xianting.tian@...ux.alibaba.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     arei.gonglei@...wei.com, jasowang@...hat.com,
        xuanzhuo@...ux.alibaba.com, herbert@...dor.apana.org.au,
        davem@...emloft.net, amit@...nel.org, arnd@...db.de,
        gregkh@...uxfoundation.org, marcel@...tmann.org,
        johan.hedberg@...il.com, luiz.dentz@...il.com,
        linux-bluetooth@...r.kernel.org,
        virtualization@...ts.linux-foundation.org,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
        Xianting Tian <tianxianting.txt@...baba-inc.com>
Subject: Re: [PATCH 1/3] virtio-crypto: fixup potential cpu stall when free
 unused bufs


在 2023/6/9 下午11:57, Michael S. Tsirkin 写道:
> On Fri, Jun 09, 2023 at 09:18:15PM +0800, Xianting Tian wrote:
>> From: Xianting Tian <tianxianting.txt@...baba-inc.com>
>>
>> Cpu stall issue may happen if device is configured with multi queues
>> and large queue depth, so fix it.
> What does "may happen" imply exactly?
> was this observed?
I didn't met such issue, this patch set just a theoretical fix.
>
>> Signed-off-by: Xianting Tian <xianting.tian@...ux.alibaba.com>
>> ---
>>   drivers/crypto/virtio/virtio_crypto_core.c | 1 +
>>   1 file changed, 1 insertion(+)
>>
>> diff --git a/drivers/crypto/virtio/virtio_crypto_core.c b/drivers/crypto/virtio/virtio_crypto_core.c
>> index 1198bd306365..94849fa3bd74 100644
>> --- a/drivers/crypto/virtio/virtio_crypto_core.c
>> +++ b/drivers/crypto/virtio/virtio_crypto_core.c
>> @@ -480,6 +480,7 @@ static void virtcrypto_free_unused_reqs(struct virtio_crypto *vcrypto)
>>   			kfree(vc_req->req_data);
>>   			kfree(vc_req->sgs);
>>   		}
>> +		cond_resched();
>>   	}
>>   }
>>   
>> -- 
>> 2.17.1