[Bug debuginfod/25375] New: optimization: speculative fdcache'ing of peers in decompressed archive

["fche at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=25375

            Bug ID: 25375
           Summary: optimization: speculative fdcache'ing of peers in
                    decompressed archive
           Product: elfutils
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: debuginfod
          Assignee: unassigned at sourceware dot org
          Reporter: fche at redhat dot com
                CC: elfutils-devel at sourceware dot org
  Target Milestone: ---

Consider a systemtap test run against debuginfod.  There are some test cases
that ask for probes of numerous kernel modules.  Each of these is submitted to
debuginfod - sequentially - and each one can result in a separate rpm2cpio job
to decompress the same kernel-debuginfo rpm.

We should consider adding an option to fdcache with the effect that: if we're
decompressing an archive for a genuine request, anticipate that there may be
near-future requests for other files in the archive, and therefore decompress &
intern them all in fdcache.  This would trade fdcache storage space for
decompression time.

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