https://criu.org/index.php?action=history&feed=atom&title=Service_descriptors 2026-05-13T18:46:52Z Revision history for this page on the wiki MediaWiki 1.35.6 https://criu.org/index.php?title=Service_descriptors&diff=4518&oldid=prev 2018-01-17T08:38:25Z

<p></p> <table class="diff diff-contentalign-left diff-editfont-monospace" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="en"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 08:38, 17 January 2018</td> </tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l1" >Line 1:</td> <td colspan="2" class="diff-lineno">Line 1:</td></tr> <tr><td class='diff-marker'>−</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>These are the fds that help us to do <del class="diffchange diffchange-inline">c</del>/<del class="diffchange diffchange-inline">r</del>. <del class="diffchange diffchange-inline">We want </del>them <del class="diffchange diffchange-inline">not </del>to <del class="diffchange diffchange-inline">intersect with any &quot;real-life&quot; ones</del>.</div></td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>These are the fds that help us to do <ins class="diffchange diffchange-inline">checkpoint and restore. There must be only files, which are used by criu frequently, and it's difficult to obtain them by another way. The number of service fds on restore is significant, as they make file table grow, so service fds may increase memory usage after restore in comparison to dump. Other common used on restore files should be placed in fdstore instead. Note, that not all members of enum sfd_type from criu/include</ins>/<ins class="diffchange diffchange-inline">servicefd.h have to be there</ins>. <ins class="diffchange diffchange-inline">Some of </ins>them <ins class="diffchange diffchange-inline">must go </ins>to <ins class="diffchange diffchange-inline">fdstore sometimes</ins>.</div></td></tr> <tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">==Restore==</ins></div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">*We try to place service fds as low as possible to minimize memory overhead. Per-fdtable variable service_fd_base points to the biggest service fd number. It's being chosen in choose_service_fd_base() in dependence of max file descriptor used by task.</ins></div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">*Since ordinary files, which are open on restore, may be bigger than service_fd_base, there is code parts where service fds mustn't be modified at all. We mask such areas via sfds_protected variable, and they aborts restore if modifications of sfds are found in such code parts.</ins></div></td></tr> <tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"></td></tr> <tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[Category:Under the hood]]</div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[Category:Under the hood]]</div></td></tr> <tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[Category:Files]]</div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[Category:Files]]</div></td></tr> <!-- diff cache key criuwikidb:diff::1.12:old-4517:rev-4518 --> </table>

Ktkhai https://criu.org/index.php?title=Service_descriptors&diff=4517&oldid=prev 2018-01-11T17:45:12Z

<p>Created page with &quot;These are the fds that help us to do c/r. We want them not to intersect with any &quot;real-life&quot; ones. <a href="/Category:Under_the_hood" title="Category:Under the hood">Category:Under the hood</a> <a href="/Category:Files" title="Category:Files">Category:Files</a>&quot;</p> <p><b>New page</b></p><div>These are the fds that help us to do c/r. We want them not to intersect with any &quot;real-life&quot; ones.<br /> <br /> <br /> [[Category:Under the hood]]<br /> [[Category:Files]]</div>

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