Arnaldo Carvalho de Melo 5f1c4225f6 perf evlist: Don't run workload if not told to ... The perf_evlist__prepare_workload() method works by forking and then waiting on a fd that must be written to to allow the workload to be exec()ed. But if the tool calling it fails to, say, set up the events with which it wants to sample the workload for, it will not call perf_evlist__start_workload(), but even in this case the workload ended up running: [acme@zoo linux]$ trace /bin/echo workload ends up running, it should not... Couldn't mmap the events: Operation not permitted workload ends up running, it should not... [acme@zoo linux]$ So check if at least one byte was written before letting exec() be called. Now the expected behaviour: [acme@zoo linux]$ trace /bin/echo workload ends up running, it should not... Couldn't mmap the events: Operation not permitted [acme@zoo linux]$ Acked-by: Jiri Olsa <jolsa@redhat.com> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Don Zickus <dzickus@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/n/tip-oh1ixo8m74rf295a05gfjw8b@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>		2014-07-31 09:57:20 -03:00
..
cgroup
firewire
hv
include
lguest
lib	Linux 3.16-rc7	2014-07-28 10:00:33 +02:00
net
nfsd
perf	perf evlist: Don't run workload if not told to	2014-07-31 09:57:20 -03:00
power
scripts
testing	tools/testing/selftests/ipc/msgque.c: improve error handling when not running as root	2014-07-03 09:21:54 -07:00
thermal/tmon	tmon: set umask to a reasonable value	2014-07-01 22:00:51 +08:00
usb	tools: ffs-test: fix header values endianess	2014-06-30 13:23:58 -05:00
virtio
vm
Makefile