[PATCH v2 0/1] MR7005: win32u: Check for driver events more often.

[William Horvath (＠whrvth)]

Use a QPC wrapper to avoid NtGetTickCount, which is coupled to the 16 millisecond user_shared_data_timeout in server/fd.c.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=57442

--
  v2: win32u: Check for driver events more often.
 
https://gitlab.winehq.org/wine/wine/-/merge_requests/7005

[PATCH v2 1/1] win32u: Check for driver events more often.

[William Horvath]

From: William Horvath <william(a)horvath.blog>

Use a QPC wrapper to avoid NtGetTickCount, which is coupled to
the 16 millisecond user_shared_data_timeout in server/fd.c. This
lowers the throttling period to 0.25ms (8khz), which is quick
enough to consume driver events from high polling rate devices.

Fixes: 54ca1ab6
Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=57442
---
 dlls/win32u/message.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/dlls/win32u/message.c b/dlls/win32u/message.c
index ef8b6f86431..fc3b0f26827 100644
--- a/dlls/win32u/message.c
+++ b/dlls/win32u/message.c
@@ -3059,14 +3059,22 @@ static HANDLE get_server_queue_handle(void)
     return ret;
 }
 
+/* monotonic timer tick for driver event check throttling */
+static inline DWORD get_driver_check_time(void)
+{
+    LARGE_INTEGER counter, freq;
+    NtQueryPerformanceCounter( &counter, &freq );
+    return counter.QuadPart * 8000 / freq.QuadPart; /* 8kHz */
+}
+
 /* check for driver events if we detect that the app is not properly consuming messages */
 static inline void check_for_driver_events(void)
 {
-    if (get_user_thread_info()->last_driver_time != NtGetTickCount())
+    if (get_user_thread_info()->last_driver_time != get_driver_check_time())
     {
         flush_window_surfaces( FALSE );
         user_driver->pProcessEvents( QS_ALLINPUT );
-        get_user_thread_info()->last_driver_time = NtGetTickCount();
+        get_user_thread_info()->last_driver_time = get_driver_check_time();
     }
 }
 
@@ -3108,7 +3116,7 @@ static DWORD wait_message( DWORD count, const HANDLE *handles, DWORD timeout, DW
     }
 
     if (ret == WAIT_TIMEOUT && !count && !timeout) NtYieldExecution();
-    if (ret == count - 1) get_user_thread_info()->last_driver_time = NtGetTickCount();
+    if (ret == count - 1) get_user_thread_info()->last_driver_time = get_driver_check_time();
 
     KeUserDispatchCallback( ¶ms.dispatch, sizeof(params), &ret_ptr, &ret_len );
 
-- 
GitLab

https://gitlab.winehq.org/wine/wine/-/merge_requests/7005