On 2019/5/31 22:37, Tejun Heo wrote:
> On Fri, May 31, 2019 at 04:29:12PM +0800, Gao Xiang wrote:
>> non-inline io_schedule() was introduced in
>> commit 10ab56434f2f ("sched/core: Separate out io_schedule_prepare() and io_schedule_finish()")
>> Keep in line with io_schedule_timeout, Otherwise
>> "/proc/<pid>/wchan" will report io_schedule()
>> rather than its callers when waiting io.
>>
>> Reported-by: Jilong Kou <koujilong@xxxxxxxxxx>
>> Cc: Tejun Heo <tj@xxxxxxxxxx>
>> Cc: Ingo Molnar <mingo@xxxxxxxxxx>
>> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
>> Signed-off-by: Gao Xiang <gaoxiang25@xxxxxxxxxx>
>
> Acked-by: Tejun Heo <tj@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> # 4.11+
Thanks Tejun. This patch will be needed for io performance analysis
since we found that Android systrace tool cannot show the callers of
iowait raised from io_schedule() on linux-4.14 LTS kernel.
Hi Andrew, could you kindly take this patch?
Thanks,
Gao Xiang
>
> Thanks.
>
