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Re: [Qemu-devel] [PATCH v2 4/4] coroutine: pool coroutines to speed up c
From: |
Kevin Wolf |
Subject: |
Re: [Qemu-devel] [PATCH v2 4/4] coroutine: pool coroutines to speed up creation |
Date: |
Thu, 12 May 2011 12:38:37 +0200 |
User-agent: |
Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.15) Gecko/20101027 Fedora/3.0.10-1.fc12 Thunderbird/3.0.10 |
Am 12.05.2011 12:22, schrieb Stefan Hajnoczi:
> On Thu, May 12, 2011 at 11:13 AM, Kevin Wolf <address@hidden> wrote:
>> terAm 12.05.2011 11:54, schrieb Stefan Hajnoczi:
>>> This patch speeds up coroutine creation by reusing freed coroutines.
>>> When a coroutine terminates it is placed in the pool instead of having
>>> its resources freed. The next time a coroutine is created it can be
>>> taken straight from the pool and requires no initialization.
>>>
>>> Performance results on an Intel Core2 Duo T9400 (2.53GHz) for
>>> ./check-coroutine --benchmark-lifecycle 20000000:
>>>
>>> No pooling: 19.5 sec
>>> With pooling: 1.1 sec
>>>
>>> Signed-off-by: Stefan Hajnoczi <address@hidden>
>>> ---
>>> check-coroutine.c | 2 ++
>>> qemu-coroutine-int.h | 2 ++
>>> qemu-coroutine.c | 49
>>> ++++++++++++++++++++++++++++++++++++++++++++++---
>>> qemu-coroutine.h | 9 +++++++++
>>> vl.c | 2 ++
>>> 5 files changed, 61 insertions(+), 3 deletions(-)
>>>
>>> diff --git a/check-coroutine.c b/check-coroutine.c
>>> index 5a42c49..223c50c 100644
>>> --- a/check-coroutine.c
>>> +++ b/check-coroutine.c
>>> @@ -218,6 +218,8 @@ int main(int argc, char **argv)
>>> };
>>> int i;
>>>
>>> + qemu_coroutine_init();
>>
>> Can we use module_init instead of adding an explicit call to main()?
>> This would prevent forgetting to add it in qemu-img and qemu-io like in
>> this patch.
>
> module_init what? :) qemu-img/qemu-io only init MODULE_INIT_BLOCK so
> we'd have to modify them anyway.
Right... I was thinking of block, but in fact coroutines are not limited
to the block layer, so we would abuse it.
> I don't want to add qemu-img/qemu-io things yet because we don't have
> a block layer user for coroutines yet. The qcow2 patches should
> contain these changes.
I hope we won't forget it. A missing atexit isn't a very obvious bug.
Kevin
- [Qemu-devel] [PATCH v2 0/4] Coroutines for better asynchronous programming, Stefan Hajnoczi, 2011/05/12
- [Qemu-devel] [PATCH v2 4/4] coroutine: pool coroutines to speed up creation, Stefan Hajnoczi, 2011/05/12
- Re: [Qemu-devel] [PATCH v2 4/4] coroutine: pool coroutines to speed up creation, Kevin Wolf, 2011/05/12
- Re: [Qemu-devel] [PATCH v2 4/4] coroutine: pool coroutines to speed up creation, Stefan Hajnoczi, 2011/05/12
- Re: [Qemu-devel] [PATCH v2 4/4] coroutine: pool coroutines to speed up creation,
Kevin Wolf <=
- Re: [Qemu-devel] [PATCH v2 4/4] coroutine: pool coroutines to speed up creation, Paolo Bonzini, 2011/05/12
- Re: [Qemu-devel] [PATCH v2 4/4] coroutine: pool coroutines to speed up creation, Stefan Hajnoczi, 2011/05/12
- Re: [Qemu-devel] [PATCH v2 4/4] coroutine: pool coroutines to speed up creation, Paolo Bonzini, 2011/05/12
- Re: [Qemu-devel] [PATCH v2 4/4] coroutine: pool coroutines to speed up creation, Stefan Hajnoczi, 2011/05/12
[Qemu-devel] [PATCH v2 2/4] coroutine: add check-coroutine automated tests, Stefan Hajnoczi, 2011/05/12
[Qemu-devel] [PATCH v2 3/4] coroutine: add check-coroutine --benchmark-lifecycle, Stefan Hajnoczi, 2011/05/12
[Qemu-devel] [PATCH v2 1/4] coroutine: introduce coroutines, Stefan Hajnoczi, 2011/05/12