[Bug 109830] CPU iowait higher when run the GPU multi decoding threads

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109830

--- Comment #27 from Owen Zhang <owen.zhang at intel.com> ---
Hi，

i have made the following changes on kernel 4.19:

1) apply the following patch:
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-4.20.y&id=0a2fff2428f1e175932dc3cf115b68c868e3a839

2) change the io_schedule_timeout to schedule_timeout.
+++ b/drivers/gpu/drm/i915/i915_request.c
@@ -1322,7 +1322,7 @@ long i915_request_wait(struct i915_request *rq,
                        break;
                }

-               timeout = io_schedule_timeout(timeout);
+               timeout = schedule_timeout(timeout);
        }


the iowait value reduce to below 80%. so Is it possible to do one W/R to
customer temp deployment patch before the formal fix patch release?
any suggestions? thanks very much.

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