Re: [PATCH 0/9] namespaces: Introduction

From: Serge E. Hallyn
Date: Fri May 19 2006 - 09:30:09 EST

Quoting Eric W. Biederman (ebiederm@xxxxxxxxxxxx):
> "Serge E. Hallyn" <serue@xxxxxxxxxx> writes:
> > This patchset introduces a per-process utsname namespace. These can
> > be used by openvz, vserver, and application migration to virtualize and
> > isolate utsname info (i.e. hostname). More resources will follow, until
> > hopefully most or all vserver and openvz functionality can be implemented
> > by controlling resource namespaces from userspace.
> >
> > Previous utsname submissions placed a pointer to the utsname namespace
> > straight in the task_struct. This patchset (and the last one) moves
> > it and the filesystem namespace pointer into struct nsproxy, which is
> > shared by processes sharing all namespaces. The intent is to keep
> > the taskstruct smaller as the number of namespaces grows.
> Previously you mentioned:
> > BTW - a first set of comparison results showed nsproxy to have better
> > dbench and tbench throughput, and worse kernbench performance. Which
> > may make sense given that nsproxy results in lower memory usage but
> > likely increased cache misses due to extra pointer dereference.
> Is this still true? Or did our final reference counting tweak fix
> the kernbench numbers?

I haven't checked that. I'll start a new set of runs later this
morning, should get the results out saturday.

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