On Sat, 2019-07-06 at 18:29 +0300, Alexander Monakov wrote: > ^ this is a problem, your libstdc++ library is configured to use the syscall > directly instead of letting the libc go via the VDSO fastpath. Oh snap! I'm fully aware of the VDSO situation but I didn't grok the fact that the syscall meant I wasn't using it. Hm, this code is built with a sysroot designed to work on Red Hat EL 6.5 and newer systems; I suppose the RHEL 6.5 glibc must not have used the clock_gettime VDSO (or if it did my GCC configure doesn't find it). OK, that gives me a clear direction. Thanks Alexander!
