A gentle ping.
Thanks.
2016-11-15 21:18 GMT+08:00 Ganesh Mahendran <opensource.ganesh@xxxxxxxxx>:
> Hi, Greg
>
> 2016-11-15 18:18 GMT+08:00 Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx>:
>> On Tue, Nov 15, 2016 at 05:55:39PM +0800, Ganesh Mahendran wrote:
>>> VM_IOREMAP is used to access hardware through a mechanism called
>>> I/O mapped memory. Android binder is a IPC machanism which will
>>> not access I/O memory.
>>>
>>> Also VM_IOREMAP has alignment requiement which may not needed in
>>> binder.
>>> __get_vm_area_node()
>>> {
>>> ...
>>> if (flags & VM_IOREMAP)
>>> align = 1ul << clamp_t(int, fls_long(size),
>>> PAGE_SHIFT, IOREMAP_MAX_ORDER);
>>> ...
>>> }
>>>
>>> This patch use VM_ALLOC to get vm area.
>>>
>>> Below is the throughput test result:
>>>
>>> # ./binderThroughputTest -w 100
>>> I run this command 10 times:
>>> before after
>>> average iterations per sec: 11199.9 11886.9
>>>
>>> No performance regression found throgh binder test.
>>>
>>> Signed-off-by: Ganesh Mahendran <opensource.ganesh@xxxxxxxxx>
>>> ---
>>> drivers/android/binder.c | 2 +-
>>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> What changed from v1?
>
> Sorry for missing the change information.
>
> In V2, I run the binder test. And there is no side effect with this
> patch.
>
>>
>> Always list that below the --- line.
>
> Thanks for reminder.
>
>>
>> thanks,
>>
>> greg k-h
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