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Profiler experiments: interrupt check at function exit

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Review URL: https://chromiumcodereview.appspot.com/9432026

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10795 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
This commit is contained in:
jkummerow@chromium.org 2012-02-22 15:18:29 +00:00
parent 6703dddac4
commit 75bf5e44d2
2 changed files with 24 additions and 1 deletions
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3
src/flag-definitions.h
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@ -177,6 +177,8 @@ DEFINE_bool(self_optimization, false,
"primitive functions trigger their own optimization")
DEFINE_bool(count_based_interrupts, false,
"trigger profiler ticks based on counting instead of timing")
DEFINE_bool(interrupt_at_exit, false,
"insert an interrupt check at function exit")
DEFINE_bool(weighted_back_edges, false,
"weight back edges by jump distance for interrupt triggering")
DEFINE_int(interrupt_budget, 10000,
@ -187,6 +189,7 @@ DEFINE_int(type_info_threshold, 0,
DEFINE_implication(experimental_profiler, watch_ic_patching)
DEFINE_implication(experimental_profiler, self_optimization)
DEFINE_implication(experimental_profiler, count_based_interrupts)
DEFINE_implication(experimental_profiler, interrupt_at_exit)
DEFINE_implication(experimental_profiler, weighted_back_edges)
DEFINE_bool(trace_opt_verbose, false, "extra verbose compilation tracing")

22
src/ia32/full-codegen-ia32.cc
View File

@ -332,7 +332,7 @@ void FullCodeGenerator::EmitStackCheck(IterationStatement* stmt,
int weight = 1;
if (FLAG_weighted_back_edges) {
ASSERT(back_edge_target->is_bound());
int distance = masm_->pc_offset() - back_edge_target->pos();
int distance = masm_->SizeOfCodeGeneratedSince(back_edge_target);
weight = Min(127, Max(1, distance / 100));
}
__ sub(Operand::Cell(profiling_counter_), Immediate(Smi::FromInt(weight)));
@ -389,6 +389,26 @@ void FullCodeGenerator::EmitReturnSequence() {
__ push(eax);
__ CallRuntime(Runtime::kTraceExit, 1);
}
if (FLAG_interrupt_at_exit) {
// Pretend that the exit is a backwards jump to the entry.
int weight = 1;
if (FLAG_weighted_back_edges) {
int distance = masm_->pc_offset();
weight = Min(127, Max(1, distance / 100));
}
__ sub(Operand::Cell(profiling_counter_),
Immediate(Smi::FromInt(weight)));
Label ok;
__ j(positive, &ok, Label::kNear);
__ push(eax);
InterruptStub stub;
__ CallStub(&stub);
__ pop(eax);
// Reset the countdown.
__ mov(Operand::Cell(profiling_counter_),
Immediate(Smi::FromInt(FLAG_interrupt_budget)));
__ bind(&ok);
}
#ifdef DEBUG
// Add a label for checking the size of the code used for returning.
Label check_exit_codesize;