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Date: Thu, 19 Nov 2015 09:24:57 +0800 From: "Wangnan (F)" <wangnan0@...wei.com> To: Arnaldo Carvalho de Melo <acme@...nel.org> CC: Jiri Olsa <jolsa@...nel.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org> Subject: Re: perf BPF/elfdep intermitent build problems On 2015/11/19 6:44, Arnaldo Carvalho de Melo wrote: > Have you guys ever saw this? > > [acme@zoo linux]$ alias m > alias m='perf stat -e cycles make O=/tmp/build/perf -C tools/perf > install-bin' > [acme @zoo linux]$ m > make: Entering directory '/home/git/linux/tools/perf' > BUILD: Doing 'make -j4' parallel build > make[2]: Nothing to be done for 'fixdep'. > CC /tmp/build/perf/util/machine.o > LD /tmp/build/perf/util/libperf-in.o > No libelf found > BPF API too old This error message means the kernel header in rootfs is too old, causes tools/build/feature/test-bpf.c failed to be built. > Makefile:191: recipe for target 'elfdep' failed > make[2]: *** [elfdep] Error 255 > make[2]: *** Waiting for unfinished jobs.... > Makefile:194: recipe for target 'bpfdep' failed > make[2]: *** [bpfdep] Error 255 > Makefile.perf:434: recipe for target '/tmp/build/perf/libbpf.a' failed > make[1]: *** [/tmp/build/perf/libbpf.a] Error 2 > make[1]: *** Waiting for unfinished jobs.... > LD /tmp/build/perf/libperf-in.o > Makefile:87: recipe for target 'install-bin' failed > make: *** [install-bin] Error 2 > make: Leaving directory '/home/git/linux/tools/perf' > > Performance counter stats for 'make O=/tmp/build/perf -C tools/perf > install-bin': > > 10,265,920,369 cycles > > 3.002799545 seconds time elapsed > > [acme@zoo linux]$ > > > If I go and try doing a clean on the libbpf dir I see another problem: > > [acme@zoo linux]$ cd tools/lib/bpf > [acme@zoo bpf]$ make clean > > Auto-detecting system features: > ... libelf: [ OFF ] > ... bpf: [ OFF ] > > CLEAN libbpf > CLEAN core-gen > [acme@zoo bpf]$ > > No need for feature detection when doing a plain 'make clean', right? > > But then, after cleaning it again, and entering tools/perf to do a 'make > clean' as well, it does the feature detection at a second 'make clean' > and this time it shoes [ on ] for both libelf and bpf, and this time > I manage to build perf. > > This is all intermitent, will eventually try to drill down if you don't > fix it first First let me try to trigger it in my environment... Thank you. > - Arnaldo -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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