code review 7029044: runtime: less aggressive per-thread stack segment caching

src/pkg/runtime/runtime.h

 // Copyright 2009 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
 /*
  * basic types
  */
 typedef signed char             int8;
 typedef unsigned char           uint8;
 typedef signed short            int16;
@@ skipping 113 matching lines @@
         true    = 1,
         false   = 0,
 };
 enum
 {
         PtrSize = sizeof(void*),
 };
 enum
 {
         // Per-M stack segment cache size.
-        StackCacheSize = 128,
+        StackCacheSize = 32,
         // Global <-> per-M stack segment cache transfer batch size.
-        StackCacheBatch = 32,
+        StackCacheBatch = 16,
 };
 
 /*
  * structures
  */
 union   Lock
 {
         uint32  key;    // futex-based impl
         M*      waitm;  // linked list of waiting M's (sema-based impl)
 };
@@ skipping 500 matching lines @@
 void    runtime·minit(void);
 Func*   runtime·findfunc(uintptr);
 int32   runtime·funcline(Func*, uintptr);
 void*   runtime·stackalloc(uint32);
 void    runtime·stackfree(void*, uintptr);
 MCache* runtime·allocmcache(void);
 void    runtime·freemcache(MCache*);
 void    runtime·mallocinit(void);
 bool    runtime·ifaceeq_c(Iface, Iface);
 bool    runtime·efaceeq_c(Eface, Eface);
-uintptr runtime·ifacehash(Iface);
-uintptr runtime·efacehash(Eface);
+uintptr runtime·ifacehash(Iface, uintptr);
+uintptr runtime·efacehash(Eface, uintptr);
 void*   runtime·malloc(uintptr size);
 void    runtime·free(void *v);
 bool    runtime·addfinalizer(void*, void(*fn)(void*), uintptr);
 void    runtime·runpanic(Panic*);
 void*   runtime·getcallersp(void*);
 int32   runtime·mcount(void);
 int32   runtime·gcount(void);
 void    runtime·mcall(void(*)(G*));
 uint32  runtime·fastrand1(void);
 
@@ skipping 218 matching lines @@
 extern float64 runtime·neginf;
 extern uint64 ·nan;
 extern uint64 ·posinf;
 extern uint64 ·neginf;
 #define ISNAN(f) ((f) != (f))
 
 enum
 {
         UseSpanType = 1,
 };