Commits on Jun 23, 2024

1. Add emerge options to require free space/inodes in tmpdir …

   This adds
     --jobs-tmpdir-require-free-gb=GB
     --jobs-tmpdir-require-free-kilo-inodes=INODES
   as emerge emerge options.
   
   When those are used with --jobs, makes portage/emerge check that
   PORTAGE_TMPDIR has sufficient free resources before a new job is
   started.
   
   Thanks goes out to Zac Medico, as this was inspired by
   gentoo#1351, with the following
   differences:
   
   - options are absolute values, not relatives ones
   - defaults for both options are specified
   - option values are scaled, using a decaying function, considering
     the number or running jobs
   - emit a warning once a threshold is reached
   
   Note that the scaling of the resource constraints can not be perfect
   in the presence of concurrently running emerge jobs and without
   _can_add_job() being provided with the number of jobs that are
   potentially added. It is always possible that a emerge job has not yet
   used much of the filesystem when we check the remaining filesystem
   resources, and later on uses much more than the scaling function
   accounted for it.
   
   Ultimately, there is a tradeoff between portage limiting parallelism
   needlessly (but still being able to emerge all packages) and portage
   failing due to missing resources in PORTAGE_TMPDIR. The chosen
   defaults are rather large and most packages use much less
   filesystem resources then the scaling function accounts for
   them. Therefore, the implemented approach idea is to lean towards
   favoring functionality over parallelism.
   
   Bugs: https://bugs.gentoo.org/934382
   Signed-off-by: Florian Schmaus <[email protected]>

   

   Flowdalic committed Jun 23, 2024
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