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Re: Per container statistics (containerstats) [message #13922 is a reply to message #13921] Fri, 08 June 2007 02:28 Go to previous messageGo to previous message
Paul Menage is currently offline  Paul Menage
Messages: 642
Registered: September 2006
Senior Member
On 6/7/07, Balbir Singh <balbir@linux.vnet.ibm.com> wrote:
> > this needs tasklist_lock?
> >
>
> rcu_read_lock() should be fine. From Eric's patch at
>
> 2.6.17-mm2 - proc-remove-tasklist_lock-from-proc_pid_readdir.patch
>
> The patch mentions that "We don't need the tasklist_lock to safely
> iterate through processes anymore."

Containers V10 includes an iterator interface for listing the member
tasks of a container, which avoids scanning the entire tasklist.
Downside is that it currently requires taking a read_lock on a global
lock, but I hope to improve on that in the future.

Paul

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