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Introduce disposable call-cache.

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This patch contains several ideas:

(1) Disposable inline method cache (IMC) for race-free inline method cache
    * Making call-cache (CC) as a RVALUE (GC target object) and allocate new
      CC on cache miss.
    * This technique allows race-free access from parallel processing
      elements like RCU.
(2) Introduce per-Class method cache (pCMC)
    * Instead of fixed-size global method cache (GMC), pCMC allows flexible
      cache size.
    * Caching CCs reduces CC allocation and allow sharing CC's fast-path
      between same call-info (CI) call-sites.
(3) Invalidate an inline method cache by invalidating corresponding method
    entries (MEs)
    * Instead of using class serials, we set "invalidated" flag for method
      entry itself to represent cache invalidation.
    * Compare with using class serials, the impact of method modification
      (add/overwrite/delete) is small.
    * Updating class serials invalidate all method caches of the class and
      sub-classes.
    * Proposed approach only invalidate the method cache of only one ME.

See [Feature #16614] for more details.
This commit is contained in:
Koichi Sasada 2020-01-08 16:14:01 +09:00
parent f2286925f0
commit b9007b6c54
Notes: git 2020-02-22 09:59:43 +09:00
32 changed files with 1733 additions and 997 deletions
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11
method.h
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@ -69,8 +69,12 @@ typedef struct rb_callable_method_entry_struct { /* same fields with rb_method_e
#define METHOD_ENTRY_VISI(me) (rb_method_visibility_t)(((me)->flags & (IMEMO_FL_USER0 | IMEMO_FL_USER1)) >> (IMEMO_FL_USHIFT+0))
#define METHOD_ENTRY_BASIC(me) (int) (((me)->flags & (IMEMO_FL_USER2 )) >> (IMEMO_FL_USHIFT+2))
#define METHOD_ENTRY_COMPLEMENTED(me) ((me)->flags & IMEMO_FL_USER3)
#define METHOD_ENTRY_COMPLEMENTED_SET(me) ((me)->flags = (me)->flags | IMEMO_FL_USER3)
#define METHOD_ENTRY_COMPLEMENTED(me) ((me)->flags & IMEMO_FL_USER3)
#define METHOD_ENTRY_COMPLEMENTED_SET(me) ((me)->flags = (me)->flags | IMEMO_FL_USER3)
#define METHOD_ENTRY_CACHED(me) ((me)->flags & IMEMO_FL_USER4)
#define METHOD_ENTRY_CACHED_SET(me) ((me)->flags = (me)->flags | IMEMO_FL_USER4)
#define METHOD_ENTRY_INVALIDATED(me) ((me)->flags & IMEMO_FL_USER5)
#define METHOD_ENTRY_INVALIDATED_SET(me) ((me)->flags = (me)->flags | IMEMO_FL_USER5)
static inline void
METHOD_ENTRY_VISI_SET(rb_method_entry_t *me, rb_method_visibility_t visi)
@ -229,4 +233,7 @@ void rb_scope_visibility_set(rb_method_visibility_t);
VALUE rb_unnamed_parameters(int arity);
void rb_clear_method_cache(VALUE klass_or_module, ID mid);
void rb_clear_method_cache_all(void);
#endif /* RUBY_METHOD_H */