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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - REGRESSION(r213645): It made JSC tests super slow and timeout on AArch Linux"
   href="https://bugs.webkit.org/show_bug.cgi?id=169510">169510</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>REGRESSION(r213645): It made JSC tests super slow and timeout on AArch Linux
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>WebKit
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>WebKit Nightly Build
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Linux
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>Blocker
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P1
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>JavaScriptCore
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>webkit-unassigned&#64;lists.webkit.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>ossy&#64;webkit.org
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>fpizlo&#64;apple.com, mark.lam&#64;apple.com
          </td>
        </tr>

        <tr>
          <th>Blocks</th>
          <td>108645, 169300
          </td>
        </tr></table>
      <p>
        <div>
        <pre>before r213645: 
- <a href="https://build.webkit.org/builders/JSCOnly%20Linux%20AArch64%20Release/builds/4895">https://build.webkit.org/builders/JSCOnly%20Linux%20AArch64%20Release/builds/4895</a>
- runtime: 1h 15mins
- only 7 failures

after r213645: 
- <a href="https://build.webkit.org/builders/JSCOnly%20Linux%20AArch64%20Release/builds/4950">https://build.webkit.org/builders/JSCOnly%20Linux%20AArch64%20Release/builds/4950</a>
- runtime: 10h 30 mins (stopped after it, full test runtime would have taken days)
- zillion timeouts

Note, that <a href="https://trac.webkit.org/changeset/213645">https://trac.webkit.org/changeset/213645</a> broke the build too
which was fixed in <a href="https://trac.webkit.org/changeset/213705">https://trac.webkit.org/changeset/213705</a>. But I tested
r213645 with the buildfix directly and it showed that r213645 caused this
serious regression.

Is there any way to disable this super slow new feature on Linux?
I don't and won't have to debug what caused this regeression in your patch.</pre>
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