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@huawei.com Cc: Tejun Heo tj@kernel.org Cc: Ingo Molnar mingo@redhat.com Cc: Peter Zijlstra peterz@infradead.org Signed-off-by: Gao Xiang gaoxiang25@huawei.com

Acked-by: Tejun Heo tj@kernel.org

Cc: stable@vger.kernel.org # 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.