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machenbach authored
Revert of [profiler] Fix attribution for the top-most interpreted frame. (patchset #3 id:40001 of https://codereview.chromium.org/2667253004/ ) Reason for revert: Flaky crashes on mac asan: https://build.chromium.org/p/client.v8/builders/V8%20Mac64%20ASAN/builds/10739 Original issue's description: > [profiler] Fix attribution for the top-most interpreted frame. > > Before this change, we attributed samples for the top-most interpreter frame to the second-topmost frame if we were in a bytecode handler with elided frame. With this change we try to detect that we are in a handler without a frame. If we are, we do not drop the topmost frame. > > For example, consider the program > > function inner() { > var s = 0; > for (var i = 0; i < 100000; i++) { > s += i * i; > } > return s; > } > > function trivial() { > return inner(); > } > > for (var i = 0; i < 2000; i++) { > trivial(); > } > > > Before this change, d8 --prof --ignition --nocrankshaft and linux-tick-processor would produce: > > [JavaScript]: > ticks total nonlib name > 4885 83.4% 83.5% Function: ~trivial a.js:15:17 > 759 13.0% 13.0% Function: ~inner a.js:7:15 > > After this change, we get > > [JavaScript]: > ticks total nonlib name > 5486 95.9% 96.2% Function: ~inner a.js:7:15 > 4 0.1% 0.1% Function: ~trivial a.js:15:17 > > Review-Url: https://codereview.chromium.org/2667253004 > Cr-Commit-Position: refs/heads/master@{#42894} > Committed: https://chromium.googlesource.com/v8/v8/+/d07f6540c1f9628ed2ba1fa6507c90db07ccc5f5 TBR=bmeurer@chromium.org,jarin@chromium.org # Skipping CQ checks because original CL landed less than 1 days ago. NOPRESUBMIT=true NOTREECHECKS=true NOTRY=true Review-Url: https://codereview.chromium.org/2670843005 Cr-Commit-Position: refs/heads/master@{#42912}
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