Messages in this thread | | | Date | Thu, 9 Sep 2010 13:40:53 +0200 | From | Ingo Molnar <> | Subject | Re: perf events over (net) console? |
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* Frederic Weisbecker <fweisbec@gmail.com> wrote:
> On Thu, Sep 09, 2010 at 01:19:01PM +0200, Peter Zijlstra wrote: > > On Thu, 2010-09-09 at 13:06 +0200, Harald Gustafsson wrote: > > > Hi, > > > > > > We would like to monitor the perf events continuously on a remote > > > machine. Does it exist a solution (in the kernel) to direct the > > > output to a console or maybe even a netconsole? We would like to > > > avoid a user space application to transfer it, due to that the > > > machine will be running a test which will heavily load it and we > > > want to avoid as many unrelated user space tasks as possible. If > > > not mainlined does anyone have a patch for this? > > > > No, and its a daft requirement. > > > > You need a process context anyway to read the data and send it to > > whatever place you want it. > > > > Putting that in-kernel serves no purpose what so ever. > > But if we bring the splice support, that can be done with minimal > userspace noise. Plus that would work with the usual sockets but not > limited to that.
Yes. If we can transform the data over the network without it touching disk, then that would be a sufficiently 'does not disturb other tasks' measurement method.
Thanks,
Ingo
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