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7041789: 30% perf regression with c2/arm following 7017732

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Implement a more accurate is_scavengable()

Reviewed-by: stefank, jcoomes, ysr
This commit is contained in:
Jon Masamitsu 2011-05-03 10:30:34 -07:00
parent 8cdd97938c
commit 6819e3739e
12 changed files with 132 additions and 36 deletions
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14
hotspot/src/share/vm/code/nmethod.hpp
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@ -109,7 +109,7 @@ class xmlStream;
class nmethod : public CodeBlob {
friend class VMStructs;
friend class NMethodSweeper;
friend class CodeCache; // non-perm oops
friend class CodeCache; // scavengable oops
private:
// Shared fields for all nmethod's
methodOop _method;
@ -466,17 +466,17 @@ public:
bool is_at_poll_return(address pc);
bool is_at_poll_or_poll_return(address pc);
// Non-perm oop support
// Scavengable oop support
bool on_scavenge_root_list() const { return (_scavenge_root_state & 1) != 0; }
protected:
enum { npl_on_list = 0x01, npl_marked = 0x10 };
void set_on_scavenge_root_list() { _scavenge_root_state = npl_on_list; }
enum { sl_on_list = 0x01, sl_marked = 0x10 };
void set_on_scavenge_root_list() { _scavenge_root_state = sl_on_list; }
void clear_on_scavenge_root_list() { _scavenge_root_state = 0; }
// assertion-checking and pruning logic uses the bits of _scavenge_root_state
#ifndef PRODUCT
void set_scavenge_root_marked() { _scavenge_root_state |= npl_marked; }
void clear_scavenge_root_marked() { _scavenge_root_state &= ~npl_marked; }
bool scavenge_root_not_marked() { return (_scavenge_root_state &~ npl_on_list) == 0; }
void set_scavenge_root_marked() { _scavenge_root_state |= sl_marked; }
void clear_scavenge_root_marked() { _scavenge_root_state &= ~sl_marked; }
bool scavenge_root_not_marked() { return (_scavenge_root_state &~ sl_on_list) == 0; }
// N.B. there is no positive marked query, and we only use the not_marked query for asserts.
#endif //PRODUCT
nmethod* scavenge_root_link() const { return _scavenge_root_link; }