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Stephane reported a problem with forced leader in pipe mode, where
report does not force the group output. The reason is that we don't
force the leader in pipe mode.
This patch adds HEADER_LAST_FEATURE mark to have a point where we have
all events and features received, and force the group if requested.
$ perf record --group -e '{cycles, instructions}' -o - kill | perf report -i - --group
SNIP
# Overhead Command Shared Object Symbol
# ................ ....... ................ .......................
#
28.36% 0.00% kill libc-2.25.so [.] __unregister_atfork
26.32% 0.00% kill libc-2.25.so [.] _dl_addr
26.10% 0.00% kill ld-2.25.so [.] _dl_relocate_object
17.32% 0.00% kill ld-2.25.so [.] __tunables_init
1.70% 0.01% kill [unknown] [k] 0xffffffffafa01a40
0.20% 0.00% kill ld-2.25.so [.] _start
0.00% 48.77% kill ld-2.25.so [.] do_lookup_x
0.00% 42.97% kill libc-2.25.so [.] _IO_getline
0.00% 6.35% kill ld-2.25.so [.] strcmp
0.00% 1.71% kill ld-2.25.so [.] _dl_sysdep_start
0.00% 0.19% kill ld-2.25.so [.] _dl_start
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Tested-by: Stephane Eranian <eranian@google.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20180314092205.23291-2-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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