On 11/30/18 3:04 PM, Jeff Moyer wrote:
> Jens Axboe writes:
>
A limit of 4M is imposed as the largest buffer we currently support.
There's nothing preventing us from going larger, but we need some cap,
and 4M seemed like it would definitely be big enough.
>>>
>>> Doesn't this mean
Jens Axboe writes:
>>> A limit of 4M is imposed as the largest buffer we currently support.
>>> There's nothing preventing us from going larger, but we need some cap,
>>> and 4M seemed like it would definitely be big enough.
>>
>> Doesn't this mean that a user can pin a bunch of memory?
On 11/30/18 2:44 PM, Jeff Moyer wrote:
> Hi, Jens,
>
> Jens Axboe writes:
>
>> If we have fixed user buffers, we can map them into the kernel when we
>> setup the io_context. That avoids the need to do get_user_pages() for
>> each and every IO.
>>
>> To utilize this feature, the application
Hi, Jens,
Jens Axboe writes:
> If we have fixed user buffers, we can map them into the kernel when we
> setup the io_context. That avoids the need to do get_user_pages() for
> each and every IO.
>
> To utilize this feature, the application must set both
> IOCTX_FLAG_USERIOCB, to provide iocb's
If we have fixed user buffers, we can map them into the kernel when we
setup the io_context. That avoids the need to do get_user_pages() for
each and every IO.
To utilize this feature, the application must set both
IOCTX_FLAG_USERIOCB, to provide iocb's in userspace, and then
