From 6fb715d8a150eb07d6f613d923ade5026412add1 Mon Sep 17 00:00:00 2001
From: Ruslan Cheremin <ruslan.cheremin@jetbrains.com>
Date: Tue, 18 Aug 2026 15:07:28 +0200
Subject: [PATCH] IJPL-253116: disable FilePageCache buffers flushing on
 idle/focus lost

+ `FilePageCache` direct buffers were flushed and released on IDE focus lost + idle => caused freezes => not a lot of profit from it => disable by default


(cherry picked from commit df4075cd24a3e7563d81477cb93cda82d998a928)

IJ-CR-219603

GitOrigin-RevId: 187b25fa4425388a25637cd55b61ebcbab3f00dd
---
 .../src/com/intellij/ide/AppIdleMemoryCleaner.kt            | 6 ++++--
 .../platform-resources/src/META-INF/PlatformExtensions.xml  | 3 +++
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/platform/platform-impl/src/com/intellij/ide/AppIdleMemoryCleaner.kt b/platform/platform-impl/src/com/intellij/ide/AppIdleMemoryCleaner.kt
index fd63c6d84f90..b74c261f63c8 100644
--- a/platform/platform-impl/src/com/intellij/ide/AppIdleMemoryCleaner.kt
+++ b/platform/platform-impl/src/com/intellij/ide/AppIdleMemoryCleaner.kt
@@ -129,8 +129,10 @@ class AppIdleMemoryCleaner(private val cs: CoroutineScope) {
     stats.measureGc {
       runGc()
     }
-    stats.measureDirectBuffers {
-      releaseIndexCachedDirectBuffers()
+    if (!Registry.`is`("ide.idle.memory.cleaner.enabled.page.cache.release")) {
+      stats.measureDirectBuffers {
+        releaseIndexCachedDirectBuffers()
+      }
     }
 
     PlatformMemoryUtil.getInstance().trimLinuxNativeHeap()
diff --git a/platform/platform-resources/src/META-INF/PlatformExtensions.xml b/platform/platform-resources/src/META-INF/PlatformExtensions.xml
index c750b37ca00c..a0fc423cf6b8 100644
--- a/platform/platform-resources/src/META-INF/PlatformExtensions.xml
+++ b/platform/platform-resources/src/META-INF/PlatformExtensions.xml
@@ -2057,6 +2057,9 @@ The refresh itself is toggled by (Preferences | Appearance &amp; Behavior | Syst
     <registryKey key="ide.idle.memory.cleaner.delay"
                  defaultValue="5000"
                  description="A delay in milliseconds between the IDE becoming idle and the memory cleaning being performed"/>
+    <registryKey key="ide.idle.memory.cleaner.enabled.page.cache.release"
+                 defaultValue="false"
+                 description="Flush and release allocated direct buffers to OS when IDE becomes idle"/>
     <registryKey key="progresses.show.counter.icon.instead.of.show.link"
                  defaultValue="true"
                  description="Progresses would be shown with an icon with their number in status bar instead of Show All link"/>