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

[Daniel P. Berrangé]

On Wed, Jul 03, 2019 at 09:44:41AM +0100, Daniel P. Berrangé wrote:
> 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/

Opps, wrong LWN link

  https://lwn.net/Articles/789023/


Regards,
Daniel
-- 
|: https://berrange.com      -o-    https://www.flickr.com/photos/dberrange :|
|: https://libvirt.org         -o-            https://fstop138.berrange.com :|
|: https://entangle-photo.org    -o-    https://www.instagram.com/dberrange :|