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8278020: ~13% variation in Renaissance-Scrabble
Backport-of: 4ba980ba439f94a6b5015e64382a6c308476d63f
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shipilev committed Jan 10, 2022
1 parent 744d785 commit 7554d8c1efc3c8607693fbc74b3c2a2948f566d3
Showing 1 changed file with 6 additions and 3 deletions.
@@ -117,8 +117,8 @@ class Klass : public Metadata {
// Klass identifier used to implement devirtualized oop closure dispatching.
const KlassID _id;

// vtable length
int _vtable_len;
// Processed access flags, for use by Class.getModifiers.
jint _modifier_flags;

// The fields _super_check_offset, _secondary_super_cache, _secondary_supers
// and _primary_supers all help make fast subtype checks. See big discussion
@@ -154,7 +154,10 @@ class Klass : public Metadata {
// Provide access the corresponding instance java.lang.ClassLoader.
ClassLoaderData* _class_loader_data;

jint _modifier_flags; // Processed access flags, for use by Class.getModifiers.
int _vtable_len; // vtable length. This field may be read very often when we
// have lots of itable dispatches (e.g., lambdas and streams).
// Keep it away from the beginning of a Klass to avoid cacheline
// contention that may happen when a nearby object is modified.
AccessFlags _access_flags; // Access flags. The class/interface distinction is stored here.

JFR_ONLY(DEFINE_TRACE_ID_FIELD;)

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