linux/tools
Stephane Eranian 5622c07b47 perf stat: Fix case where guest/host monitoring is not supported by kernel
By default, perf stat sets exclude_guest = 1. But when you run perf on a
kernel which does not support  host/guest filtering, then you get an
error saying the event in unsupported. This comes from the fact that
when the perf_event_attr struct passed by the user is larger than the
one known to the kernel there is safety check which ensures that all
unknown bits are zero. But here, exclude_guest is 1 (part of the unknown
bits) and thus the perf_event_open() syscall return EINVAL.

To my surprise, running perf record on the same kernel did not exhibit
the problem. The reason is that perf record handles the problem by
catching the error and retrying with guest/host excludes set to zero.
For some reason, this was not done with perf stat. This patch fixes this
problem.

Signed-off-by: Stephane Eranian <eranian@google.com>
Cc: Gleb Natapov <gleb@redhat.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Robert Richter <robert.richter@amd.com>
Link: http://lkml.kernel.org/r/20120427124538.GA7230@quad
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2012-05-01 14:20:00 -03:00
..
firewire tools/firewire: nosy-dump: increment program version 2010-07-27 11:04:12 +02:00
hv Tools: hv: Support enumeration from all the pools 2012-03-16 13:36:04 -07:00
include/tools tools/include: Add byteshift headers for endian access 2012-02-28 10:22:51 -08:00
lguest lguest: move the lguest tool to the tools directory 2012-01-12 15:44:47 +10:30
nfsd NFSD: Added fault injection script 2011-11-07 21:10:47 -05:00
perf perf stat: Fix case where guest/host monitoring is not supported by kernel 2012-05-01 14:20:00 -03:00
power Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux 2012-03-30 16:45:39 -07:00
testing mm: move hugepage test examples to tools/testing/selftests/vm 2012-03-28 17:14:37 -07:00
usb Merge branch 'x86-build-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2012-03-22 09:40:53 -07:00
virtio tools/virtio: stub out strong barriers 2012-02-28 09:13:16 +02:00
vm mm: move slabinfo.c to tools/vm 2012-03-28 17:14:37 -07:00