lkml.org 
[lkml]   [2006]   [May]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH 0/9] namespaces: Introduction
From
Date
"Serge E. Hallyn" <serue@us.ibm.com> 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 just want to be certain that we don't add an optimization,
that reduces performance.

> Changes:
> - the reference count on fs namespace and uts namespace now
> refers to the number of nsproxies pointing to it
> - some consolidation of namespace cloning and exit code to
> clean up kernel/{fork,exit}.c
> - passed ltp and ltpstress on smp power, x86, and x86-64
> boxes.

Nice.

Eric

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2006-05-19 10:56    [W:0.606 / U:0.556 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site