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<p class="MsoNormal"><span lang="ES" style="font-size:11.0pt;mso-fareast-language:EN-US">Hello,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="ES" style="font-size:11.0pt;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;mso-fareast-language:EN-US">This proposal is targeted only for those cases where Hotspot developers agree on undecorated output. For example, C2 developers with jit+inlining. Every other use of
UL except for those specific (and previously socialized and agreed-upon) cases will keep being the same as it is right now.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;mso-fareast-language:EN-US">In summary, this is more of an ad-hoc proposal for the cases where some specific uses of -Xlog are always accompanied with ::none<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;mso-fareast-language:EN-US">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;mso-fareast-language:EN-US">Antón<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><b><span style="color:black">From:
</span></b><span style="color:black">Kirk Pepperdine <kirk@kodewerk.com><br>
<b>Date: </b>Monday, 30 September 2024 at 18:07<br>
<b>To: </b>Anton Seoane Ampudia <anton.seoane.ampudia@oracle.com><br>
<b>Cc: </b>David Holmes <david.holmes@oracle.com>, hotspot-dev@openjdk.org <hotspot-dev@openjdk.org><br>
<b>Subject: </b>[External] : Re: 8340363: Tag-specific default decorators for UnifiedLogging<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:11.0pt"><br>
So to be clear, is the proposal now to just drop the default decorators,<span class="apple-converted-space"> </span><br>
rather than allowing them to be replaced with alternate defaults? If<span class="apple-converted-space"> </span><br>
that is the case then it is the same as writing:<br>
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-Xlog:A+B::none<br>
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and I don't really see much value in that. But I wouldn't oppose it.</span><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I would. At a minimum you need a timestamp.<br>
<br>
<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:11.0pt"><br>
Allowing new defaults gives more flexibility - but obviously the<span class="apple-converted-space"> </span><br>
developers using the specific tag combinations have to agree on what<span class="apple-converted-space"> </span><br>
defaults to set.</span><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">At the moment to get a reasonable GC log for G1, one needs to use the following setting.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">-Xlog:gc*,gc+ref=debug,gc+phases=debug,gc+age=debug,safepoint:file=gc.log<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Also, the “noise to signal” ratio in these logs is exceptionally high.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Kind regards,<o:p></o:p></p>
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<p class="MsoNormal">Kirk<o:p></o:p></p>
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