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Field notes/Engineering/Firecracker and the swap myth

Firecracker and the swap myth

Yes you can. With a small kernel patch and a userspace pager, anyway.

PRPriya Rao·MAR 14, 2026·14 MIN READ·Engineering
SBX-01C4SBX-01E3SBX-0202SBX-0221SBX-0240SBX-025FSBX-027ESBX-029DSBX-02BCSBX-02DBSBX-02FASBX-0319SBX-0338SBX-0357SBX-0376[ RUNTIME: ACTIVE ] P50 2.45S · P99 4.12S · 5M/PROJECT

00 · Preface

Yes you can. With a small kernel patch and a userspace pager, anyway.

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DRAFT

We're actively editing this one. The public version will land next cycle.

PR
WRITTEN BYPriya RaoStaff Engineer
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