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This is an automatically generated e-mail. To reply, visit:
<a href="http://git.reviewboard.kde.org/r/110834/">http://git.reviewboard.kde.org/r/110834/</a>
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<p style="margin-top: 0;">On June 7th, 2013, 12:32 p.m. UTC, <b>David Faure</b> wrote:</p>
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<a href="http://git.reviewboard.kde.org/r/110834/diff/2/?file=148962#file148962line648" style="color: black; font-weight: bold; text-decoration: underline;">kio/kio/kdirlister.cpp</a>
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(Diff revision 2)
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">void KDirListerCache::forgetDirs( KDirLister *lister, const KUrl& _url, bool notify )</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span> <span class="p">(</span><span class="n">url</span><span class="p">.</span><span class="n">isParentOf</span><span class="p">(</span><span class="n">it</span><span class="p">.</span><span class="n">key</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;">This seems potentially very slow to me.
When navigating away from a dir and there's a large tree view with many files in the same process, this is going to take a very long time.
What was wrong with the QCache idea? </pre>
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<p>On June 8th, 2013, 12:02 a.m. UTC, <b>Dawit Alemayehu</b> wrote:</p>
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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;">Well to me it seems that the benefits of QCache, automatic maintenance of the cache, seems to be its weakness for a particular use case. When copying or modifying lots of files such as images, videos etc on network shares, the QCache can potentially remove items that are still being modified/copied there by causing the stat to be performed again. Would that not put us back into the same position ? Granted not as many stats will be performed but that would depend on QCache's maxCost setting and the number of files being modified or copied. That is why I opted not want to use QCache in this case.</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;">I take this back. My concern above was unwarranted since it is unrealistic to expect tons of files to be updated at the same time. KIO limits the number of files one can copy/download at one given time. And that limit is much lower than the default maximum cost used in QCache. As such, I have changed the code to use QCache.</pre>
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<p>- Dawit</p>
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<p>On June 7th, 2013, 5:03 a.m. UTC, Dawit Alemayehu wrote:</p>
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<div>Review request for kdelibs and David Faure.</div>
<div>By Dawit Alemayehu.</div>
<p style="color: grey;"><i>Updated June 7, 2013, 5:03 a.m.</i></p>
<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;">This patch, inspired by the issue reported in bug# 317676, attempts to cache and reuse the original result from the stat call in KDirListerCache::slotFileDirty. Since that stat call is only needed to determine whether the "dirty" resource is a file or directory, caching the result helps us avoid the potential for tons of KDE::stat calls. The stat will happen if you for example copy or download a large file into a local folder while that folder is being viewed in a file browsing app such as dolphin or konqueror. The cached information is removed if the resource being monitored is deleted or renamed.</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;">The patch was tested by the bug reporter and it fixed the issue for him.</pre>
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<b style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Bugs: </b>
<a href="http://bugs.kde.org/show_bug.cgi?id=317676">317676</a>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
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<li>kio/kio/kdirlister.cpp <span style="color: grey">(a721673)</span></li>
<li>kio/kio/kdirlister_p.h <span style="color: grey">(a78cc3c)</span></li>
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<p><a href="http://git.reviewboard.kde.org/r/110834/diff/" style="margin-left: 3em;">View Diff</a></p>
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