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Re: [Qemu-devel] [RFC PATCH] target-arm: protect cpu_exclusive_*.
From: |
Alexander Graf |
Subject: |
Re: [Qemu-devel] [RFC PATCH] target-arm: protect cpu_exclusive_*. |
Date: |
Wed, 17 Dec 2014 11:28:56 +0100 |
User-agent: |
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:31.0) Gecko/20100101 Thunderbird/31.3.0 |
On 17.12.14 11:27, Frederic Konrad wrote:
> On 16/12/2014 17:37, Peter Maydell wrote:
>> On 16 December 2014 at 09:13, <address@hidden> wrote:
>>> From: KONRAD Frederic <address@hidden>
>>>
>>> This adds a lock to avoid multiple exclusive access at the same time
>>> in case of
>>> TCG multithread.
> Hi Peter,
>
>> This feels to me like it's not really possible to review on
>> its own, since you can't see how it fits into the design of
>> the rest of the multithreading support.
> true the only thing we observe is that it didn't change anything right now.
>
>> The other approach here rather than having a pile of mutexes
>> in the target-* code would be to have TCG IR support for
>> "begin critical section"/"end critical section". Then you
>> could have the main loop ensure that no other CPU is running
>> at the same time as the critical-section code. (linux-user
>> already has an ad-hoc implementation of this for the
>> exclusives.)
>>
>> -- PMM
>>
> What do you mean by TCG IR?
TCP ops. The nice thing is that TCG could translate those into
transactions if the host supports them as well.
Alex
- [Qemu-devel] [RFC PATCH] target-arm: protect cpu_exclusive_*., fred . konrad, 2014/12/16
- Re: [Qemu-devel] [RFC PATCH] target-arm: protect cpu_exclusive_*., Peter Maydell, 2014/12/16
- Re: [Qemu-devel] [RFC PATCH] target-arm: protect cpu_exclusive_*., Frederic Konrad, 2014/12/17
- Re: [Qemu-devel] [RFC PATCH] target-arm: protect cpu_exclusive_*.,
Alexander Graf <=
- Re: [Qemu-devel] [RFC PATCH] target-arm: protect cpu_exclusive_*., Mark Burton, 2014/12/17
- Re: [Qemu-devel] [RFC PATCH] target-arm: protect cpu_exclusive_*., Alexander Graf, 2014/12/17
- Re: [Qemu-devel] [RFC PATCH] target-arm: protect cpu_exclusive_*., Mark Burton, 2014/12/17
- Re: [Qemu-devel] [RFC PATCH] target-arm: protect cpu_exclusive_*., Alexander Graf, 2014/12/17
- Re: [Qemu-devel] [RFC PATCH] target-arm: protect cpu_exclusive_*., Paolo Bonzini, 2014/12/17
- Re: [Qemu-devel] [RFC PATCH] target-arm: protect cpu_exclusive_*., Peter Maydell, 2014/12/17
- Re: [Qemu-devel] [RFC PATCH] target-arm: protect cpu_exclusive_*., Mark Burton, 2014/12/17
- Re: [Qemu-devel] [RFC PATCH] target-arm: protect cpu_exclusive_*., Peter Maydell, 2014/12/17
- Re: [Qemu-devel] [RFC PATCH] target-arm: protect cpu_exclusive_*., Mark Burton, 2014/12/17
- Re: [Qemu-devel] [RFC PATCH] target-arm: protect cpu_exclusive_*., Peter Maydell, 2014/12/17