Messages in this thread | | | Date | Wed, 26 Jun 2013 11:46:34 +0200 | From | Ingo Molnar <> | Subject | Re: [PATCH v2 00/14] perf, persistent: Kernel updates for perf tool integration |
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* Borislav Petkov <bp@alien8.de> wrote:
> On Wed, Jun 26, 2013 at 10:12:23AM +0200, Robert Richter wrote: > > We get a new fd by opening the persistent event with the syscall. > > There would be 2 new ioctls: > > > > ioctl(fd, PERF_EVENT_IOC_DETACH, 0); > > ioctl(fd, PERF_EVENT_IOC_ATTACH, 0); > > > > This would be fine and reuses existing infrastructure. > > Well, how are you going to say that you want to open an already existing > persistent event or your want to create exactly the same persistent > event? Are we even going to allow identical persistent events to > coexist?
If already existing persistent events show up somewhere in sysfs (or in a separate pseudofilesystem) then an open() of them [given sufficient privileges of the caller, etc.] could attach to them.
Thanks,
Ingo
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