From de79f2a1d493515114f0e74ca3b5c86bcdfd334e Mon Sep 17 00:00:00 2001
From: David Aurelio <davidaurelio@fb.com>
Date: Sat, 2 Mar 2019 12:39:37 -0800
Subject: [PATCH] for experimentation: configurable measure cache size

Summary:
@public

Allows to limit the number of measure cache entries used. This is purely for experimentation.

The measure cache uses about half of every `YGNode`. Reducing its size would allow us to reduce resident memory used by Yoga.

Reviewed By: SidharthGuglani

Differential Revision: D14279027

fbshipit-source-id: e0d22138230bee7fb129c193eb6e4085de02a36e
---
 yoga/Yoga.cpp | 11 ++++++++++-
 yoga/Yoga.h   |  2 ++
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/yoga/Yoga.cpp b/yoga/Yoga.cpp
index 27072c1c..94d9a602 100644
--- a/yoga/Yoga.cpp
+++ b/yoga/Yoga.cpp
@@ -28,6 +28,15 @@ __forceinline const float fmaxf(const float a, const float b) {
 using namespace facebook::yoga;
 using detail::Log;
 
+namespace {
+size_t usedMeasureCacheEntries = YG_MAX_CACHED_RESULT_COUNT;
+}
+
+void YGSetUsedCachedEntries(size_t n) {
+  usedMeasureCacheEntries =
+      n == 0 || n > YG_MAX_CACHED_RESULT_COUNT ? YG_MAX_CACHED_RESULT_COUNT : n;
+}
+
 #ifdef ANDROID
 static int YGAndroidLog(
     const YGConfigRef config,
@@ -3871,7 +3880,7 @@ bool YGLayoutNodeInternal(
         layoutMarkerData.maxMeasureCache =
             layout->nextCachedMeasurementsIndex + 1;
       }
-      if (layout->nextCachedMeasurementsIndex == YG_MAX_CACHED_RESULT_COUNT) {
+      if (layout->nextCachedMeasurementsIndex == usedMeasureCacheEntries) {
         if (gPrintChanges) {
           Log::log(node, YGLogLevelVerbose, nullptr, "Out of cache entries!\n");
         }
diff --git a/yoga/Yoga.h b/yoga/Yoga.h
index 753a2f9f..7132a934 100644
--- a/yoga/Yoga.h
+++ b/yoga/Yoga.h
@@ -411,6 +411,8 @@ WIN_EXPORT float YGRoundValueToPixelGrid(
     const bool forceCeil,
     const bool forceFloor);
 
+void YGSetUsedCachedEntries(size_t);
+
 YG_EXTERN_C_END
 
 #ifdef __cplusplus