Re: [PATCH 0/7] utrace/ptrace

2009-12-23 Thread Oleg Nesterov
On 12/22, Andrew Morton wrote: On Fri, 18 Dec 2009 02:11:16 +0100 Oleg Nesterov o...@redhat.com wrote: It allows for multiple separate tracing engines to work in parallel without interfering with each other. Higher-level tracing facilities can be implemented as loadable kernel modules

Re: [PATCH 0/7] utrace/ptrace

2009-12-23 Thread Roland McGrath
Well. I had a lot of technical discussions with Roland about utrace, but I never asked him why he created this thing ;) To me, utrace looks like vfs. Currently we have the single and very poor filesystem, ptrace. Until we add the appropriate layer, we can't expect the further improvements is

Re: [PATCH 0/7] utrace/ptrace

2009-12-23 Thread Roland McGrath
Do you have an estimate or better numbers how the overhead of seccomp-over-utrace compares to the current in-tree seccomp? I never measured it. I would estimate that any difference one way or another is in the noise. The point of seccomp is to run a process that almost never makes any system