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perf_hooks: reset prev_ before starting ELD timer #26693

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perf_hooks: reset prev_ before starting ELD timer #26693

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Flarna
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@Flarna Flarna commented Mar 15, 2019

reset ELDHistogram.prev_ before staring timer to ensure that start
timer doesn't leak across disable() enable() calls.

Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • tests and/or benchmarks are included
  • documentation is changed or added
  • commit message follows commit guidelines

@jasnell I have seen this nit late during review of #26556 and it's not directly related to your changes. But feel free to integrate it into your PR to avoid a later on merge conflict.

reset `ELDHistogram.prev_` before staring timer to ensure that start
timer doesn't leak across `disable()` `enable()` calls.
@nodejs-github-bot nodejs-github-bot added the c++ Issues and PRs that require attention from people who are familiar with C++. label Mar 15, 2019
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jasnell commented Mar 16, 2019

Doh! Good catch

@richardlau
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Can this be tested for?

@Flarna
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Flarna commented Mar 16, 2019

@richardlau sure but timeout based test tend to be flaky - or take a long time to have a good security margin.
Currently the whole ELD functionality does not testing the actual values just the presence of them.

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jasnell commented Mar 16, 2019 via email

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@BridgeAR BridgeAR added the author ready PRs that have at least one approval, no pending requests for changes, and a CI started. label Mar 17, 2019
@ZYSzys
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ZYSzys commented Mar 20, 2019

Landed in 614a747 🎉

@ZYSzys ZYSzys closed this Mar 20, 2019
@Flarna Flarna deleted the perf_hooks_reset_prev branch March 20, 2019 07:03
targos pushed a commit to targos/node that referenced this pull request Mar 27, 2019
reset `ELDHistogram.prev_` before staring timer to ensure that start
timer doesn't leak across `disable()` `enable()` calls.

PR-URL: nodejs#26693
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Richard Lau <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Yongsheng Zhang <[email protected]>
targos pushed a commit that referenced this pull request Mar 27, 2019
reset `ELDHistogram.prev_` before staring timer to ensure that start
timer doesn't leak across `disable()` `enable()` calls.

PR-URL: #26693
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Richard Lau <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Yongsheng Zhang <[email protected]>
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7 participants