On Wed, 21 Jul 2010, KOSAKI Motohiro wrote: > > This patch adds trace points to mmap, munmap, and brk that will report > > relevant addresses and sizes before each function exits successfully. > > > > Signed-off-by: Eric B Munson <emunson@xxxxxxxxx> > > I don't think this is good idea. if you need syscall result, you should > use syscall tracer. IOW, This tracepoint bring zero information. > > Please see perf_event_mmap() usage. Our kernel manage adress space by > vm_area_struct. we need to trace it if we need to know what kernel does. > > Thanks. The syscall tracer does not give you the address and size of the mmaped areas so this does provide information above simply tracing the enter/exit points for each call. perf_event_mmap does provide the information for mmap calls. Originally I sent a patch to add a trace point to munmap and Peter Z asked for corresponding points in the mmap family. If the consensus is that the trace point in munmap is the only one that should be added I can resend that patch. -- Eric B Munson IBM Linux Technology Center ebmunson@xxxxxxxxxx
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