On Thu, Apr 21, 2011 at 5:23 PM, David Ahern <[email protected]> wrote: > > > On 04/21/11 01:46, Francis Moreau wrote: >> Hello, >> >> Sorry if the question is dumb but I'm a bit lost about this. >> >> I know that ftrace exists but I think that perf can do this too: I >> have a userspace application which is calling a libc C function (read) >> which ends up doing a sys_read. >> >> For the sys_read, I'd like to see what's happening in the kernel by >> displaying the call graph. >> >> Can perf do that ? > > Have you tried 'perf record -g'? >
Well, I don't see how it can be done with perf record -g. Let's say I'm interested to see the path taken in the kernel when a process is calling sys_sleep: $ perf record -g sleep 1 Then I can use: $ perf report -g But I don't see what I am asking for. What am I missing ? Thanks -- Francis -- To unsubscribe from this list: send the line "unsubscribe linux-perf-users" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
