From a9ff714186334bce8fba9e7ebbbfbf50f05ba9db Mon Sep 17 00:00:00 2001 From: Hiroyuki Ishii Date: Tue, 29 Jun 2021 17:13:03 +0900 Subject: qt5: Fix timer leak in qtwayland to avoid animations being sluggish With long-running qt applications which have fluid animations in wayland environment, the animation becomes obviously sluggish because massive amount of memcpy() is called through a constructor being placed in a loop in QTimerInfoList::timerInsert() function. This is caused by a timer-index leak bug of qtwayland, which is already reported to the qt project as following ticket. https://bugreports.qt.io/browse/QTBUG-79838 Unfortunately QTBUG-79838 is still open because maintenance of non-commercial version of qt5 is already stopped. However, we've confirmed that the patch attached to that ticket works fine except for that part of it is no longer needed due to the deletion of the code. So let's apply only effective part of it. Bug-AGL: SPEC-3991 Signed-off-by: Hiroyuki Ishii Change-Id: Ib148b81aabb98e8df10c1414cdbfe26f7ddf09a6 Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/meta-agl/+/26466 Tested-by: Jenkins Job builder account ci-image-build: Jenkins Job builder account ci-image-boot-test: Jenkins Job builder account Reviewed-by: Jan-Simon Moeller Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/meta-agl/+/26759 Reviewed-by: Scott Murray Reviewed-by: Naoto YAMAGUCHI --- .../0001-Fix-timer-leak-and-a-potential-race.patch | 42 ++++++++++++++++++++++ .../meta-qt5/recipes-qt/qt5/qtwayland_%.bbappend | 1 + .../meta-qt5/recipes-qt/qt5/qtwayland_aglcore.inc | 6 ++++ 3 files changed, 49 insertions(+) create mode 100644 meta-agl-core/dynamic-layers/meta-qt5/recipes-qt/qt5/qtwayland/0001-Fix-timer-leak-and-a-potential-race.patch create mode 100644 meta-agl-core/dynamic-layers/meta-qt5/recipes-qt/qt5/qtwayland_%.bbappend create mode 100644 meta-agl-core/dynamic-layers/meta-qt5/recipes-qt/qt5/qtwayland_aglcore.inc diff --git a/meta-agl-core/dynamic-layers/meta-qt5/recipes-qt/qt5/qtwayland/0001-Fix-timer-leak-and-a-potential-race.patch b/meta-agl-core/dynamic-layers/meta-qt5/recipes-qt/qt5/qtwayland/0001-Fix-timer-leak-and-a-potential-race.patch new file mode 100644 index 000000000..642eabc4b --- /dev/null +++ b/meta-agl-core/dynamic-layers/meta-qt5/recipes-qt/qt5/qtwayland/0001-Fix-timer-leak-and-a-potential-race.patch @@ -0,0 +1,42 @@ +From f4d3297e6705cc524729d629bf94db11841dbb24 Mon Sep 17 00:00:00 2001 +From: Simon Yuan +Date: Thu, 7 Nov 2019 09:22:37 +1300 +Subject: [PATCH] Fix timer leak and a potential race + +The callback timer is now killed immediately before starting a new timer, this +makes sure there is always a single active callback timer. It's unclear why +killing the timer in a separate lambda doesn't always kill the timer in time, +the hypothesis is that if killing the timer comes after starting a new one, then +the previous timer is now left dangling. Whatever the reason is, it makes even +more sense to kill the timer in the same lamda and immediately before starting a +new timer anyway. +--- + src/client/qwaylandwindow.cpp | 11 +++++------ + 1 file changed, 5 insertions(+), 6 deletions(-) + +diff --git a/src/client/qwaylandwindow.cpp b/src/client/qwaylandwindow.cpp +index 0df99d9f..93b46bf1 100644 +--- a/src/client/qwaylandwindow.cpp ++++ b/src/client/qwaylandwindow.cpp +@@ -1136,13 +1136,12 @@ void QWaylandWindow::handleUpdate() + mWaitingForFrameCallback = true; + mWaitingForUpdate = false; + +- // Stop current frame timer if any, can't use killTimer directly, see comment above. +- int fcbId = mFrameCallbackTimerId.fetchAndStoreOrdered(-1); +- if (fcbId != -1) +- QMetaObject::invokeMethod(this, [this, fcbId] { killTimer(fcbId); }, Qt::QueuedConnection); +- + // Start a timer for handling the case when the compositor stops sending frame callbacks. +- QMetaObject::invokeMethod(this, [this] { // Again; can't do it directly ++ // Can't use killTimer directly, see comment above. ++ QMetaObject::invokeMethod(this, [this] { ++ int fcbId = mFrameCallbackTimerId.fetchAndStoreOrdered(-1); ++ if (fcbId != -1) ++ killTimer(fcbId); + if (mWaitingForFrameCallback) + mFrameCallbackTimerId = startTimer(100); + }, Qt::QueuedConnection); +-- +2.25.1 + diff --git a/meta-agl-core/dynamic-layers/meta-qt5/recipes-qt/qt5/qtwayland_%.bbappend b/meta-agl-core/dynamic-layers/meta-qt5/recipes-qt/qt5/qtwayland_%.bbappend new file mode 100644 index 000000000..aa55c3a0c --- /dev/null +++ b/meta-agl-core/dynamic-layers/meta-qt5/recipes-qt/qt5/qtwayland_%.bbappend @@ -0,0 +1 @@ +require ${@bb.utils.contains('AGL_FEATURES', 'aglcore', 'qtwayland_aglcore.inc', '', d)} diff --git a/meta-agl-core/dynamic-layers/meta-qt5/recipes-qt/qt5/qtwayland_aglcore.inc b/meta-agl-core/dynamic-layers/meta-qt5/recipes-qt/qt5/qtwayland_aglcore.inc new file mode 100644 index 000000000..ef5d0c7b5 --- /dev/null +++ b/meta-agl-core/dynamic-layers/meta-qt5/recipes-qt/qt5/qtwayland_aglcore.inc @@ -0,0 +1,6 @@ +FILESEXTRAPATHS_prepend := "${THISDIR}/qtwayland:" + +# Patch reported in https://bugreports.qt.io/browse/QTBUG-79838, not upstreamed +SRC_URI += " \ + file://0001-Fix-timer-leak-and-a-potential-race.patch \ + " -- cgit 1.2.3-korg