On Thu, Jul 08, 2010 at 07:48:08PM +0200, Peter Zijlstra wrote: > On Thu, 2010-07-08 at 13:35 -0400, Christoph Hellwig wrote: > > > What kind of infrastructure is perf using for recording > > mmap()/mremap()/brk() information? > > A direct hook into mmap_region(), see perf_event_mmap(). > > We used to only track VM_EXEC regions, but these days we can also track > data regions (although it wouldn't track mremap and brk I think). > > We need the VM_EXEC maps to make sense of the instruction pointer > samples. > > Eric recently added support for !VM_EXEC mmap() in order to interpret > linear addresses provided by things like the software pagefault events > and certain powerpc hardware events. Maybe the user reporting should use trace points everywhere, leaving the direct hook just for the executable tracking? -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>