On Fri, 1 Nov 2013, 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.
It is true the manpage is a bit confusing here, though that's mostly due to the confusing way that Linux interchangably uses pid/tid for process and thread ids. I'll see if I can get the documentation made more clear. Vince -- To unsubscribe from this list: send the line "unsubscribe linux-perf-users" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
