perf kvm: Guest userspace samples should not be lumped with host uspace
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 <jolsa@redhat.com>
Signed-off-by: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1342826756-64663-4-git-send-email-dsahern@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
1 file changed