Em Wed, Mar 21, 2018 at 04:38:07PM +0100, Jiri Olsa escreveu: > On Wed, Mar 21, 2018 at 10:11:10AM +0800, Jin, Yao wrote: > > Hi Jiri, > > > > I'm still thinking it's worth displaying the warning when perf missing some > > libraries. > > > > Somebody just told me that perf didn't work well. While after some > > investigations, I found it's just missing some libraries when building the > > perf. > > > > But I have spent some time on getting the root cause. If with this patch, it > > should be very easily to know that. > > true.. Arnaldo, any feedback on this one?
Lemme re-read the thread... > > > I just think it'd better provide some hints to user. For example, > > > "symbol is disabled and you need to install libelf/xxx", say something > > > like that. > > > > > > But it looks the column can't contain too much information (i.e. no more > > > space to contain the entire hints). > > > > > > Any idea? Or just add this warning in verbose mode? > > > > > > > also your change does not affect tui mode > > > > > > > > annotation for some reason does not start at all.. could be > > > > little more verbose ;-) > > > > > > > > jirka > > > > > > > > > > Yes, it doesn't affect tui mode. > > > > > > Or we just add this warning in verbose mode? > > > > > > e.g. perf report -v? > > how about displaying libraries separately with -vv output, > that would mimic the build message, like: > > $ ./perf -vv > perf version 4.16.rc6.g18fd48 > > dwarf: [ on ] > dwarf_getlocations: [ on ] > glibc: [ on ] > gtk2: [ on ] > libaudit: [ on ] > libbfd: [ on ] > libelf: [ on ] > libnuma: [ on ] > numa_num_possible_cpus: [ on ] > libperl: [ on ] > libpython: [ on ] > libslang: [ on ] > libcrypto: [ on ] > libunwind: [ on ] > libdw-dwarf-unwind: [ on ] > zlib: [ on ] > lzma: [ on ] > get_cpuid: [ on ] > bpf: [ on ] > > and perf -vvv could display the 'make VF=1' info > > jirka
