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Add JIT warm-up threshold preferences for baseline and ion compilation

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This commit is contained in:
ownedbywuigi 2026-03-28 07:34:59 +00:00
commit 6f4da14ee2
2 changed files with 24 additions and 2 deletions
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21
js/xpconnect/src/XPCJSContext.cpp
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@ -1426,6 +1426,10 @@ ReloadPrefsCallback(const char* pref, void* data)
bool useBaselineEager = Preferences::GetBool(JS_OPTIONS_DOT_STR
"baselinejit.unsafe_eager_compilation");
bool useIonEager = Preferences::GetBool(JS_OPTIONS_DOT_STR "ion.unsafe_eager_compilation");
int32_t baselineWarmUpThreshold = Preferences::GetInt(JS_OPTIONS_DOT_STR
"baselinejit.threshold", -1);
int32_t ionWarmUpThreshold = Preferences::GetInt(JS_OPTIONS_DOT_STR
"ion.threshold", -1);
sDiscardSystemSource = Preferences::GetBool(JS_OPTIONS_DOT_STR "discardSystemSource");
@ -1472,10 +1476,23 @@ ReloadPrefsCallback(const char* pref, void* data)
JS_SetParallelParsingEnabled(cx, parallelParsing);
JS_SetOffthreadIonCompilationEnabled(cx, offthreadIonCompilation);
// -1 means "use engine default".
if (baselineWarmUpThreshold < -1)
baselineWarmUpThreshold = -1;
if (ionWarmUpThreshold < -1)
ionWarmUpThreshold = -1;
// Eager compilation prefs still override threshold prefs.
if (useBaselineEager)
baselineWarmUpThreshold = 0;
if (useIonEager)
ionWarmUpThreshold = 0;
JS_SetGlobalJitCompilerOption(cx, JSJITCOMPILER_BASELINE_WARMUP_TRIGGER,
useBaselineEager ? 0 : -1);
baselineWarmUpThreshold);
JS_SetGlobalJitCompilerOption(cx, JSJITCOMPILER_ION_WARMUP_TRIGGER,
useIonEager ? 0 : -1);
ionWarmUpThreshold);
JS_SetGlobalJitCompilerOption(cx, JSJITCOMPILER_UNBOXED_OBJECTS,
unboxedObjects);
JS_SetGlobalJitCompilerOption(cx, JSJITCOMPILER_ION_INLINING,

5
modules/libpref/init/all.js
View file

@ -1265,6 +1265,11 @@ pref("javascript.options.unboxed_objects", false);
pref("javascript.options.baselinejit", true);
pref("javascript.options.ion", true);
pref("javascript.options.ion.inlining", true);
// JIT warm-up thresholds (-1 keeps engine defaults).
// Lower values can improve sustained throughput on large script bundles
// (e.g. React/jQuery-heavy apps) at some startup compile cost.
pref("javascript.options.baselinejit.threshold", 8);
pref("javascript.options.ion.threshold", 80);
pref("javascript.options.asmjs", true);
pref("javascript.options.wasm", true);
// wasm jit crashes in 32bit builds because of 64bit casts so