[jira] Updated: (HARMONY-5281) [drlvm][startup][performance][classloader] mapping bootstrap jars directly into memory

["Pavel Pervov (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HARMONY-5281?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Pavel Pervov updated HARMONY-5281:
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    Attachment: bootstrap_jar_mapping.patch

Here is a platform independent implementation of this optimization. I'm going to commit it as soon as my commit queue gets to this JIRA.

> [drlvm][startup][performance][classloader] mapping bootstrap jars directly into memory
> --------------------------------------------------------------------------------------
>
>                 Key: HARMONY-5281
>                 URL: https://issues.apache.org/jira/browse/HARMONY-5281
>             Project: Harmony
>          Issue Type: Sub-task
>          Components: DRLVM
>            Reporter: Naumova Natalya 
>            Assignee: Pavel Pervov
>         Attachments: bootstrap_jar_mapping.patch, jarmapping.BCP.patch
>
>
> Bootstrap jar files mapping : we can deliver from a big amount of system calls (such as lseek, read etc) by mapping jars into memory via CreateFileMapping for windows and nmap for linux. Then we can work using pointer arithmetic only. 
> The same can be done with classlib jars also..

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