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[v8::ItemParallelJob] Add an instant trace event to log num_tasks/num_items for ease of trace diagnosis.

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R=mlippautz@chromium.org

Bug: chromium:651354
Change-Id: I5762813f6bd7b3c549f22ee8e43c59ca9edbe915
Reviewed-on: https://chromium-review.googlesource.com/904523
Commit-Queue: Gabriel Charette <gab@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#51133}
This commit is contained in:
Gabriel Charette 2018-02-06 17:34:21 +01:00 committed by Commit Bot
parent 7d58b3c46c
commit 384a5223b7
1 changed files with 5 additions and 0 deletions
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5
src/heap/item-parallel-job.cc
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@ -63,6 +63,11 @@ void ItemParallelJob::Run(std::shared_ptr<Counters> async_counters) {
const size_t num_items = items_.size();
const size_t num_tasks = tasks_.size();
TRACE_EVENT_INSTANT2(TRACE_DISABLED_BY_DEFAULT("v8.gc"),
"ItemParallelJob::Run", TRACE_EVENT_SCOPE_THREAD,
"num_tasks", static_cast<int>(num_tasks), "num_items",
static_cast<int>(num_items));
AsyncTimedHistogram gc_parallel_task_latency_histogram(
async_counters->gc_parallel_task_latency(), async_counters);