Zbigniew Jędrzejewski-Szmek
9db9d6806e
In https://github.com/systemd/systemd/issues/38842 it is reported that we're again having trouble accessing EFI variables: [ 292.212415] H (udev-worker)[253]: Reading EFI variable /sys/firmware/efi/efivars/LoaderDevicePartUUID-4a67b082-0a4c-41cf-b6c7-440b29bb8c4f. ... [ 344.397961] H (udev-worker)[253]: Detected slow EFI variable read access on LoaderDevicePartUUID-4a67b082-0a4c-41cf-b6c7-440b29bb8c4f: 52.185510s We don't know what causes the slowdown, but it seems reasonable to avoid unnecessary read() calls. We would read the 4-byte attr first, and then the actual value later. But our code always reads the value (and discards the attr in all cases except one, when _writing_ the variable), so let's optimize for the case where we read the value and read the whole contents in one readv().
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