Thanks for this info. It confirms what I finally concluded after looking
at source code where I saw that pid is used to get a task_struct object.
Manu
On 11/01/2013 09:41 AM, Namhyung Kim wrote:
On Tue, 29 Oct 2013 14:20:09 +0100, Manuel Selva wrote:
One more thing I forgot to ask is clarification about the pid
parameter. According to Vince Weaver page: "If pid is 0, measurements
happen on the current thread, if pid is greater than 0, the process
indicated by pid is measured, and if pid is -1, all processes are
counted." and according to perf userland tool wiki page, it's possible
to attache to a specific thread with a -i option. As a consequence I
wonder how I can use the perf perf_event_sys_call to only count events
for a specific thread ?
In the syscall's point of view, pid is actually tid AFAIK - so I works
on the thread-basis not the process.
Thanks,
Namhyung
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