recipes-core/systemd: reuse the prebuilt ldconfig cache on SOTA deployments - #479
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Saksham Singh (saks) (saks-singh) wants to merge 1 commit into
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SOTA deployments cause ldconfig.service to rescan all libraries during first boot even though OpenEmbedded generated a cache while constructing the root filesystem. This adds about 600-700 ms to startup. Install a service drop-in that invokes a helper to restore the prebuilt cache through a temporary file and atomic rename. Fall back to ldconfig -X when the required cache files are unavailable. Assisted-by: Codex:GPT-5 Signed-off-by: Saksham Singh <saks@qti.qualcomm.com>
| FILES:${PN}:append:qcom-distro:sota = " \ | ||
| ${systemd_system_unitdir}/ldconfig.service.d/10-use-prebuilt-ldconfig-cache.conf \ | ||
| ${libexecdir}/qcom-ldconfig-update \ | ||
| " No newline at end of file |
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missing new line
| do_install:append:qcom-distro:sota() { | ||
| install -Dm 0644 \ | ||
| ${UNPACKDIR}/10-use-prebuilt-ldconfig-cache.conf \ | ||
| ${D}${systemd_system_unitdir}/ldconfig.service.d/10-use-prebuilt-ldconfig-cache.conf |
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if the target 10-use-prebuilt-ldconfig-cache.conf is the same it can be ommited
| ${D}${systemd_system_unitdir}/ldconfig.service.d/10-use-prebuilt-ldconfig-cache.conf | ||
| install -Dm 0755 \ | ||
| ${UNPACKDIR}/qcom-ldconfig-update \ | ||
| ${D}${libexecdir}/qcom-ldconfig-update |
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systemd: restore the prebuilt ldconfig cache atomically
Override ldconfig.service for qcom-distro SOTA images to reuse the linker cache generated during rootfs construction instead of scanning all libraries again on first boot, effectively saving 600-700ms running the service.
Copy the cache to a temporary file and atomically rename it into place so concurrently starting processes cannot observe a truncated cache. Fall back to ldconfig -X when either cache is unavailable.
Tested on devices IQ-9075EVK and IQ-8275EVK