<div class="__aliyun_email_body_block"><div  style="font-family: Tahoma, Arial, STHeitiSC-Light, SimSun"><div  style="clear: both; font-family: Tahoma, Arial, STHeitiSC-Light, SimSun;"><span  style="font-family: Tahoma, Arial, STHeitiSC-Light, SimSun;"><br ></span></div><div  style="clear: both; font-family: Tahoma, Arial, STHeitiSC-Light, SimSun;"><span  style="font-family: Tahoma, Arial, STHeitiSC-Light, SimSun;"><span >Thanks to Alan for your feedback. </span></span></div><div  style="clear: both; font-family: Tahoma, Arial, STHeitiSC-Light, SimSun;"><span  style="font-family: Tahoma, Arial, STHeitiSC-Light, SimSun;"><span ><br ></span></span></div><div  style="clear: both; font-family: Tahoma, Arial, STHeitiSC-Light, SimSun;"><span  style="font-family: Tahoma, Arial, STHeitiSC-Light, SimSun;"><span >Based on Chen Liang's suggestion, I submitted a new draft PR <a  href="https://github.com/openjdk/jdk/pull/27995" target="_blank">https://github.com/openjdk/jdk/pull/27995</a> to add a warning message to the ComactStrings option. </span></span></div><div  style="clear: both; font-family: Tahoma, Arial, STHeitiSC-Light, SimSun;"><span  style="font-family: Tahoma, Arial, STHeitiSC-Light, SimSun;"><span ><br ></span></span></div><div  style="clear: both; font-family: Tahoma, Arial, STHeitiSC-Light, SimSun;"><span  style="font-family: Tahoma, Arial, STHeitiSC-Light, SimSun;"><span >-</span></span></div><div  style="clear: both; font-family: Tahoma, Arial, STHeitiSC-Light, SimSun;"><span  style="font-family: Tahoma, Arial, STHeitiSC-Light, SimSun;"><span >Shaojin Wen</span></span></div><blockquote  style="margin-right: 0px; margin-top: 0px; margin-bottom: 0px; font-family: Tahoma, Arial, STHeiti, SimSun; font-size: 14px; color: rgb(0, 0, 0);"><div  class="alimail-quote"><div  style="clear: both;">------------------------------------------------------------------</div><div  style="clear: both;">发件人：Alan Bateman <alan.bateman@oracle.com></div><div  style="clear: both;">发送时间：2025年10月26日(周日) 14:32</div><div  style="clear: both;">收件人："温绍锦(高铁)"<shaojin.wensj@alibaba-inc.com>; "core-libs-dev"<core-libs-dev@openjdk.org></div><div  style="clear: both;">主　题：Re: Propose to remove support for CompactStrings off</div><div  style="clear: both;"><br ></div><div  class="moz-cite-prefix">On 25/10/2025 11:53, wenshao wrote:<br >
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          <div  style="clear: both;"><span >Initially, the option to
              disable CompactStrings was provided for performance
              reasons. </span></div>
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          <div  style="clear: both;"><span >However, with some
              optimizations for UTF8 scenarios and Latin1, disabling
              CompactStrings no longer has any performance benefits. I
              propose removing the related code to make it simpler and
              easier to maintain.</span></div>
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    Thanks for bringing up this topic. I don't think it can be removed
    without notice, any removal would at least need to start with
    deprecating the CompactStrings VM option.<br >
    <br >
    It would be useful to get list of the cases that dependent on
    -XX:-CompactString/equivalent. It was initially a <span  class=" __aliyun_node_has_color __aliyun_node_has_bgcolor" style="color: rgb(23, 43, 77); font-family: 'DejaVu Sans', sans-serif; font-size: 14px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: left; text-indent: 0px; text-transform: none; word-spacing: 0px; white-space: normal; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; float: none; display: inline !important;">contingency
      in the event of a performance or functional issue but I think we
      are past all that. Things to check are the </span>32-bit ARM
    port, is that this relevant? Other ports? IBM ports appear to care
    about -CompactString, maybe only with their own VM?<br >
    <br >
    -Alan<br >
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