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restorer: Use gettimeofday() from rt-vdso for log timings
Omit calling raw syscalls and use vdso for the purpose of logging. That will eliminate as much as one-syscall-per-PIE-message. Getting time without switching to kernel will speed up C/R, keeping logs as informative as they were. Fixes: checkpoint-restore#346 Signed-off-by: Dmitry Safonov <dima@arista.com>
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