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    • Sergey Pepyakin's avatar
      PVF validation host: do not alter niceness (#4525) · 1493fed1
      Sergey Pepyakin authored
      We wanted to change niceness to accomodate the fact that some of the
      preparation tasks are low priority. For example, when a node sees that
      there is a new para was onboarded the node may start preparing right
      away. Since all other activities are more important, such as network I/O
      or validation of the backed candidates and preparation of the
      immediatelly needed PVFs.
      
      However, it turned out that this approach does not work: generally
      non-root processes can only decrease niceness and they cannot increase
      it to the previous value, as was assumed by the code.
      
      Apart from that, https://github.com/paritytech/polkadot/pull/4123
      assumes all PVFs are prepared in the same way. Specifically, that if a
      PVF preparation failed before, then PVF pre-checking will also report
      that it was failed, even though it could happen that preparation failed
      due to being low-priority. In order to avoid such cases, we decided to
      simplify the whole preparation model. Preparation under low priority
      does not work well with that.
      
      Closes https://github.com/paritytech/polkadot/issues/4520
      1493fed1
    • Sergey Pepyakin's avatar
      pvf-precheck: teach runtime-api to work with versions (#4510) · 2ccbf38b
      Sergey Pepyakin authored
      As part of #3211 we will need to add a couple of runtime APIs. That
      change is coming in a following PR.
      
      The runtime API for pre-checking will be introduced with a version bump
      for `ParachainHost`. This commit prepares the ground for that change,
      by introducing a error condition that signals that the given API is not
      supported.
      2ccbf38b
    • Koute's avatar
      Companion for Substrate#10394 (#4471) · c328d1e6
      Koute authored
      * Align PVF executor to changes in Substrate
      
      * Update to the newest `substrate`
      c328d1e6