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This is an automatically generated e-mail. To reply, visit:
<a href="https://git.reviewboard.kde.org/r/127236/">https://git.reviewboard.kde.org/r/127236/</a>
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<p style="margin-top: 0;">On March 1st, 2016, 10:19 a.m. CET, <b>Kai Uwe Broulik</b> wrote:</p>
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<a href="https://git.reviewboard.kde.org/r/127236/diff/1/?file=446153#file446153line675" style="color: black; font-weight: bold; text-decoration: underline;">src/kicontheme.cpp</a>
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(Diff revision 1)
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span> <span class="p">(</span><span class="n">QFile</span><span class="o">::</span><span class="n">exists</span><span class="p">(</span><span class="n">file</span><span class="p">))</span> <span class="p">{</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span> <span class="p">(</span><span class="n">mBaseDirThemeDir</span><span class="p">.</span><span class="n">entryList</span><span class="p">(</span><span class="n">QDir</span><span class="o">::</span><span class="n">Files</span><span class="p">).</span><span class="n">contains</span><span class="p">(</span><span class="n">name</span><span class="p">))</span> <span class="p">{</span></pre></td>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;"><p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">This looks like it causes a lot of transient allocations, creating a QList just to do a contains() on it. Or is this list kept/cached by QFile?</p></pre>
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<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;"><p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">The list is cached by QDir. See there's a <code style="text-rendering: inherit;color: #4444cc;padding: 0;white-space: normal;margin: 0;line-height: inherit;">QStringList QDirPrivate::files</code> defined in qdir_p.h.</p></pre>
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<p>- Aleix</p>
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<p>On March 1st, 2016, 4:25 a.m. CET, Aleix Pol Gonzalez wrote:</p>
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<div>Review request for KDE Frameworks and Christoph Feck.</div>
<div>By Aleix Pol Gonzalez.</div>
<p style="color: grey;"><i>Updated March 1, 2016, 4:25 a.m.</i></p>
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<b style="color: #575012; font-size: 10pt;">Repository: </b>
kiconthemes
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Description </h1>
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<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;"><p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">At the moment we're playing Battleship to see if an icon is present in a subdirectory. This means that we are checking on every directory if there's an icon that matches the size with a said name on every request.</p>
<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">This can be seen easily with strace:</p>
<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;"><div class="codehilite" style="background: #f8f8f8"><pre style="line-height: 125%"><span style="color: #19177C">$ </span>strace kwrite |& grep ENOENT | wc -l
6212
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<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">After the patch: </p>
<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;"><div class="codehilite" style="background: #f8f8f8"><pre style="line-height: 125%"><span style="color: #19177C">$ </span>strace kwrite |& grep ENOENT | wc -l
1993
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<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">We reduce these accesses to let QDir keep the list of files inside the directory (that was already being generated at some point, it just was being discarded).</p></pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Testing </h1>
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<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;"><p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">Builds, tests still pass, applications start noticeably faster.</p></pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
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<li>src/kicontheme.cpp <span style="color: grey">(0996054)</span></li>
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<p><a href="https://git.reviewboard.kde.org/r/127236/diff/" style="margin-left: 3em;">View Diff</a></p>
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