Re: [libvirt] [PATCH 0/3] Optimize mass closing of FDs on child spwaning

On Wed, Jul 03, 2019 at 09:19:17AM +0200, Michal Privoznik wrote: > If the limit for max opened files is way bigger than the default (1024), > say 3 orders bigger then spawning a child through virCommand can be > expensive because we iterate over ALL FDs within the limit and close > them. There's no need to that since we can learn the list of opened FDs > from /proc/self/fd/. Yeah I've seen this in docker containers in particular where the nfiles limit is something like 2 million. Hopefully Linux will finally get something equiv to BSD's closefrom() syscall we can use in the future: https://lwn.net/Articles/593778/