From: Gabriel Valcazar Date: Mon, 10 Nov 2025 13:53:41 +0100 Subject: [PATCH] UIProcess: WebProcessPool: always swap process when using non-HTTP(S) protocols When browsing through a local web application via the file:// protocol, the same WPEWebProcess is re-used for all pages. Browsing through several memory intensive pages in a row (especially multimedia) causes the web process to hog lots of memory, which can cause issues on systems with small RAM sizes. For example, on ConnectCore platforms with 1 GiB of RAM, opening a WebGL sample followed by playing a video sometimes causes a kernel panic due to extremely low CMA memory, which is needed for the video decoding process. To avoid this, make sure a new WPEWebProcess is generated each time a page is opened on non-HTTP(S) protocols such as file://. This adds some loading time overhead, but it assures that each page's memory is freed when exiting it, drastically reducing the chances of unexpected behavior. To accomplish this: * Set m_processSwapsOnNavigationWithinSameNonHTTPFamilyProtocol to "true" to ensure the web process isn't re-used when navigating with a non-HTTP(S) protocol. The WPE version of WebKit doesn't expose the API that can change this value at runtime, so simply change the default value * Skip the same-site navigation check when non-HTTP(S) process swap is enabled and the protocol is non-HTTP(S). Otherwise, the same web process will get re-used even if non-HTTP(S) process swap is enabled. Signed-off-by: Gabriel Valcazar --- .../UIProcess/API/APIProcessPoolConfiguration.h | 2 +- Source/WebKit/UIProcess/WebProcessPool.cpp | 12 +++++++----- 2 files changed, 8 insertions(+), 6 deletions(-) diff --git a/Source/WebKit/UIProcess/API/APIProcessPoolConfiguration.h b/Source/WebKit/UIProcess/API/APIProcessPoolConfiguration.h index 1ad5ef05e3a2..f4c7c443a8fe 100644 --- a/Source/WebKit/UIProcess/API/APIProcessPoolConfiguration.h +++ b/Source/WebKit/UIProcess/API/APIProcessPoolConfiguration.h @@ -183,7 +183,7 @@ private: std::optional m_processSwapsOnNavigationFromClient; bool m_processSwapsOnNavigationFromExperimentalFeatures { false }; bool m_alwaysKeepAndReuseSwappedProcesses { false }; - bool m_processSwapsOnNavigationWithinSameNonHTTPFamilyProtocol { false }; + bool m_processSwapsOnNavigationWithinSameNonHTTPFamilyProtocol { true }; std::optional m_isAutomaticProcessWarmingEnabledByClient; bool m_usesWebProcessCache { false }; bool m_usesBackForwardCache { true }; diff --git a/Source/WebKit/UIProcess/WebProcessPool.cpp b/Source/WebKit/UIProcess/WebProcessPool.cpp index 5bff0cd202db..a5641d0329b3 100644 --- a/Source/WebKit/UIProcess/WebProcessPool.cpp +++ b/Source/WebKit/UIProcess/WebProcessPool.cpp @@ -2122,11 +2122,13 @@ std::tuple, SuspendedPageProxy*, ASCIILiteral> WebProcessPo if (!m_configuration->processSwapsOnNavigationWithinSameNonHTTPFamilyProtocol() && !sourceURL.protocolIsInHTTPFamily() && sourceURL.protocol() == targetURL.protocol() && !siteIsolationEnabled) return { WTFMove(sourceProcess), nullptr, "Navigation within the same non-HTTP(s) protocol"_s }; - if (!sourceURL.isValid() - || !targetURL.isValid() - || sourceURL.isEmpty() - || (siteIsolationEnabled ? targetSite.matches(sourceURL) : targetSite.domain().matches(sourceURL))) - return { WTFMove(sourceProcess), nullptr, "Navigation is same-site"_s }; + if (sourceURL.protocolIsInHTTPFamily() && sourceURL.protocol() == targetURL.protocol()) { + if (!sourceURL.isValid() + || !targetURL.isValid() + || sourceURL.isEmpty() + || (siteIsolationEnabled ? targetSite.matches(sourceURL) : targetSite.domain().matches(sourceURL))) + return { WTFMove(sourceProcess), nullptr, "Navigation is same-site"_s }; + } if (sourceURL.protocolIsAbout()) { if (sourceProcess->registrableDomain().matches(targetURL))