[Pixman] 答复: 答复: compatibility problem of Pixman on SOC system(such as ARMv7, or big.LITTLE)

[Caoqiuhong]

Hi Lennart,

>>Well my arndale-octa (Exynos 5420) still only runs 4 A15s and no A7s, and apparently samsung doesn't give a shit about fixing it (apparently the 5422 and 5800 work fine), and everyone else that does
>> can't get access to the right information because of samsung.  So I can't try it out.

>>Did you try the current version (0.32 I believe).  After all it could be something that was already fixed.
I want try, but the version in android sdk(Android 4.4) is 0.30.0, as static library module linked into by third-party applications. 
Even though porting 0.32 version, the problem is still the same.
Only Google android update the new version could fix the problem.(And application vendor must update also)

Thanks.
Best Regards.
CaoQiuhong


-----邮件原件-----
发件人: Lennart Sorensen [mailto:lsorense at csclub.uwaterloo.ca] 
发送时间: 2014年7月29日 22:56
收件人: Caoqiuhong
抄送: pixman at lists.freedesktop.org
主题: Re: 答复: [Pixman] compatibility problem of Pixman on SOC system(such as ARMv7, or big.LITTLE)

On Sat, Jul 26, 2014 at 03:02:16AM +0000, Caoqiuhong wrote:
> Hi Lennart,
> 
> I just want explain detail for you question, and some findings.
> 
> >>Which CPU model are you using?  Does it support using all 8 cores at once, or does it switch between the A15 and A7 clusters?
> Not run A7 or A15 cluster separately, but run A7 and A15 cluster at once. truly 8cores, not 4 at A7, or 4 at A15 independently. 
> 
> Some test I have done.
> 2 at A7 and 2 at A15 is ok at once, this issue just happen if the core count more than 4.
> 
> In Android source code , I found pixman located in external/pixman, and static library cpufeatures will be linked in it's makefile.
> cpufeature is an android ndk module, it will open debug fs node in 
> linux, such as follow, "/sys/devices/system/cpu/present"
> "/sys/devices/system/cpu/possible"
> 
> if cpu present return value equal or less than 4, no such issue.
> if cpu present return value greater than 4, issue will happen.

Well my arndale-octa (Exynos 5420) still only runs 4 A15s and no A7s, and apparently samsung doesn't give a shit about fixing it (apparently the 5422 and 5800 work fine), and everyone else that does can't get access to the right information because of samsung.  So I can't try it out.

Did you try the current version (0.32 I believe).  After all it could be something that was already fixed.

--
Len Sorensen