desktop/source/lib/init.cxx  |    7 +++++++
 vcl/source/app/scheduler.cxx |    5 +++++
 2 files changed, 12 insertions(+)

New commits:
commit 49cde357336b1ad616ac7da869bbeca8cadc0442
Author:     Miklos Vajna <[email protected]>
AuthorDate: Thu Aug 21 14:35:03 2025 +0200
Commit:     Miklos Vajna <[email protected]>
CommitDate: Fri Aug 22 13:17:01 2025 +0200

    Related: cool#11942 desktop, vcl: add some logging on high priority tasks
    
    The original problem around tile rendering, a large document with many
    pages and a shape is resolved, but we got a report that the old bad
    behavior is still observed from time to time, with no steps to
    reproduce.
    
    So add some logging to obtain more info: if the problem is that the
    first tile gets rendered because of an unwanted high priority VCL task, then
    let's log all "interrupting" tasks and also the doc-load end and the
    tile-render start to see what tasks interrupt. Possibly that will point
    out a new task that doesn't happen for me locally and then that can be
    investigated.
    
    Change-Id: I4c92bf7d5b42628398e586276f80052e0de46306
    Reviewed-on: https://gerrit.libreoffice.org/c/core/+/189999
    Reviewed-by: Caolán McNamara <[email protected]>
    Tested-by: Jenkins CollaboraOffice <[email protected]>
    Reviewed-on: https://gerrit.libreoffice.org/c/core/+/190056
    Tested-by: Jenkins
    Reviewed-by: Miklos Vajna <[email protected]>

diff --git a/desktop/source/lib/init.cxx b/desktop/source/lib/init.cxx
index 8a0db69555a3..779930428f47 100644
--- a/desktop/source/lib/init.cxx
+++ b/desktop/source/lib/init.cxx
@@ -3107,6 +3107,7 @@ static LibreOfficeKitDocument* 
lo_documentLoadWithOptions(LibreOfficeKit* pThis,
             
pDocument->maFontsMissing.insert(aFontMappingUseData[i].mOriginalFont);
         }
 
+        SAL_INFO("lok", "lo_documentLoadWithOptions: finished @ " << 
osl_getGlobalTimer());
         return pDocument;
     }
     catch (const uno::Exception& exception)
@@ -4436,6 +4437,12 @@ static void doc_paintPartTile(LibreOfficeKitDocument* 
pThis,
                               const int nTilePosX, const int nTilePosY,
                               const int nTileWidth, const int nTileHeight)
 {
+    static bool bFirst = true;
+    if (bFirst)
+    {
+        bFirst = false;
+        SAL_INFO("lok", "doc_paintPartTile: first tile @ " << 
osl_getGlobalTimer());
+    }
     comphelper::ProfileZone aZone("doc_paintPartTile");
 
     SolarMutexGuard aGuard;
diff --git a/vcl/source/app/scheduler.cxx b/vcl/source/app/scheduler.cxx
index 5a0104ffc140..64495994e6e5 100644
--- a/vcl/source/app/scheduler.cxx
+++ b/vcl/source/app/scheduler.cxx
@@ -332,6 +332,11 @@ int Scheduler::GetMostUrgentTaskPriority()
                 if (nReadyPeriod == ImmediateTimeoutMs)
                 {
                     nMostUrgentPriority = nTaskPriority;
+                    // 0..4 (inclusive) is typically considered "high 
priority".
+                    SAL_INFO("vcl.schedule", 
"Scheduler::GetMostUrgentTaskPriority: reporting "
+                                                 << nMostUrgentPriority
+                                                 << " as the most urgent 
priority, task is '"
+                                                 << pTask->GetDebugName() << 
"'");
                     return nMostUrgentPriority;
                 }
             }

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