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Only ccache save/restore on main to improve our cache hit rate/TTLs #185

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Only ccache save/restore on main to improve our cache hit rate/TTLs #185

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7 changes: 5 additions & 2 deletions .github/workflows/cache-refresh.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -28,10 +28,13 @@ jobs:
env:
GH_TOKEN: ${{ github.token }}
run: |
# List all ccache-* cache keys, strip the run_id suffix to deduplicate by flavor/arch.
# List main-scoped ccache-* cache keys, strip the run_id suffix to deduplicate
# by flavor/arch. We specifically skip non-main branches, becuse we only want to save/restore
# from main - in GH, PR branches can use `main` caches, but main cannot see PR branch caches,
# and saving duplicated PR branch caches counts against our 10GB github limit
matrix=$(gh api "/repos/${{ github.repository }}/actions/caches" --paginate \
--jq '[.actions_caches[]
| select(.key | startswith("ccache-"))
| select(.ref == "refs/heads/main" and (.key | startswith("ccache-")))
| {prefix: (.key | gsub("-[0-9]+$"; ""))}]
| unique_by(.prefix)
| {entry: .}')
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5 changes: 5 additions & 0 deletions .github/workflows/matrix.yml
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Expand Up @@ -123,6 +123,11 @@ jobs:
compression-level: 0
retention-days: 1
- name: save ccache
# Only save from main. GH's per-repo 10GB cache pool is shared across all refs,
# so PR-scoped saves evict main-scoped entries via LRU - and main is the only ref
# whose entries the next build can actually restore. PRs still benefit because
# they will fallthrough to/inherit parent branch caches
if: github.ref == 'refs/heads/main'
uses: actions/cache/save@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5.0.2
with:
path: ~/.cache/kernel-ccache
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