[prev in list] [next in list] [prev in thread] [next in thread] 

List:       qemu-block
Subject:    Re: [Qemu-block] [Qemu-devel] [PATCH 1/2] block/io: allow AIOCB without callback
From:       Peter Lieven <pl () kamp ! de>
Date:       2015-08-31 8:38:17
Message-ID: 55E41279.7070101 () kamp ! de
[Download RAW message or body]

Am 21.08.2015 um 08:12 schrieb Eric Blake:
> On 08/20/2015 01:14 AM, Peter Lieven wrote:
>> If the backend storage is unresponsive and we cancel a request due to
>> a timeout we cannot immediately destroy the AIOCB because the storage
>> might complete the original request laster if it is responsive again.
> s/laster/later/
>
>> For this purpose allow to set the callback to NULL and ignore it in
>> this case.
>>
>> Signed-off-by: Peter Lieven <pl@kamp.de>
>> ---
> I'll leave the technical review to others, I'm just pointing out grammar.
>


I am using this one for quite some time now. It seems a good step into solving the deadlock
problem. The issue is we still need to make the ATAPI calls async. The OS is only spending 2-3 Minutes
with DMA cancelling and then issues reads again so we still deadlock at the end.

Peter



[prev in list] [next in list] [prev in thread] [next in thread]