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iseq_inline_storage_entry: 24=>16 bytes on 64-bit

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We may tag the running_thread pointer to avoid making the "once" struct
bigger than "struct iseq_inline_cache_entry".

This only saves a small amount with "valgrind ruby -e exit"
before:
  total heap usage: 48,122 allocs, 19,248 frees, 8,110,149 bytes allocated
after:
  total heap usage: 48,122 allocs, 19,253 frees, 8,099,197 bytes allocated

* insns.def (once): define and use fake RUNNING_THREAD_ONCE_DONE
  pointer to indicate is->once.running_thread is done.

* vm_core.h (iseq_inline_storage_entry): remove done field,
  allowing the union to be reduced from 24=>16 bytes on 64-bit

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47542 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
normal 2014-09-11 19:25:32 +00:00
parent 1d0de2a513
commit f0c968a778
3 changed files with 27 additions and 20 deletions
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9
ChangeLog
View file

@ -1,3 +1,12 @@
Fri Sep 12 04:24:03 2014 Eric Wong <e@80x24.org>
* insns.def (once): define and use fake RUNNING_THREAD_ONCE_DONE
pointer to indicate is->once.running_thread is done.
* vm_core.h (iseq_inline_storage_entry): remove done field,
allowing the union to be reduced from 24=>16 bytes on 64-bit
[Feature #10187]
Thu Sep 11 20:10:00 2014 Koichi Sasada <ko1@atdot.net>
* vm.c (rb_thread_mark): use rb_gc_mark_values() to mark VM stack.

37
insns.def
View file

@ -1239,28 +1239,27 @@ once
{
union iseq_inline_storage_entry *is = (union iseq_inline_storage_entry *)ic;
#define RUNNING_THREAD_ONCE_DONE ((rb_thread_t *)(0x1))
retry:
if (is->once.done == Qfalse) {
if (is->once.running_thread == NULL) {
is->once.running_thread = th;
val = is->once.value = rb_ensure(vm_once_exec, (VALUE)iseq, vm_once_clear, (VALUE)is);
/* is->once.running_thread is cleared by vm_once_clear() */
is->once.done = Qtrue;
rb_iseq_add_mark_object(GET_ISEQ(), val);
}
else if (is->once.running_thread == th) {
/* recursive once */
val = vm_once_exec((VALUE)iseq);
}
else {
/* waiting for finish */
RUBY_VM_CHECK_INTS(th);
rb_thread_schedule();
goto retry;
}
if (is->once.running_thread == RUNNING_THREAD_ONCE_DONE) {
val = is->once.value;
}
else if (is->once.running_thread == NULL) {
is->once.running_thread = th;
val = is->once.value = rb_ensure(vm_once_exec, (VALUE)iseq, vm_once_clear, (VALUE)is);
/* is->once.running_thread is cleared by vm_once_clear() */
is->once.running_thread = RUNNING_THREAD_ONCE_DONE; /* success */
rb_iseq_add_mark_object(GET_ISEQ(), val);
}
else if (is->once.running_thread == th) {
/* recursive once */
val = vm_once_exec((VALUE)iseq);
}
else {
val = is->once.value;
/* waiting for finish */
RUBY_VM_CHECK_INTS(th);
rb_thread_schedule();
goto retry;
}
}

1
vm_core.h
View file

@ -127,7 +127,6 @@ union iseq_inline_storage_entry {
struct {
struct rb_thread_struct *running_thread;
VALUE value;
VALUE done;
} once;
struct iseq_inline_cache_entry cache;
};