On Fri, Jul 20, 2012 at 05:25:48PM -0600, David Ahern wrote: > e.g., perf kvm --host --guest report -i perf.data --stdio -D > shows: > > 1 599127912065356 0x143b8 [0x48]: PERF_RECORD_SAMPLE(IP, 5): 5671/5676: > 0x7fdf95a061c0 period: 1 addr: 0 > ... chain: nr:2 > ..... 0: ffffffffffffff80 > ..... 1: fffffffffffffe00 > ... thread: qemu-kvm:5671 > ...... dso: <not found> > > (IP, 5) means sample in guest userspace. Those samples should not be lumped > into the VMM's host thread. i.e, the report output: > > 56.86% qemu-kvm [unknown] [u] 0x00007fdf95a061c0 > > With this patch the output emphasizes it is a guest userspace hit: > > 56.86% [guest/5671] [unknown] [u] 0x00007fdf95a061c0 > > Looking at 3 VMs (2 64-bit, 1 32-bit) with each running a CPU bound > process (openssl speed), perf report currently shows: > > 93.84% 117726 qemu-kvm [unknown] [u] 0x00007fd7dcaea8e5 > > which is wrong. With this patch you get: > > 31.50% 39258 [guest/18772] [unknown] [u] 0x00007fd7dcaea8e5 > 31.50% 39236 [guest/11230] [unknown] [u] 0x0000000000a57340 > 30.84% 39232 [guest/18395] [unknown] [u] 0x00007f66f641e107
Tested-by: Jiri Olsa <jo...@redhat.com> -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
