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?
Always list that below the --- line.
thanks,
greg k-h
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