linux-kernel - Re: [tools/perf] perf test LLVM failure on 4.9

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Date:   Tue, 23 Jan 2018 11:17:19 -0200
From:   Arnaldo Carvalho de Melo <acme@...hat.com>
To:     Wang Nan <wangnan0@...wei.com>
Cc:     Pintu Kumar <pintu.ping@...il.com>, linux-kernel@...r.kernel.org,
        kernelnewbies@...nelnewbies.org, quentin.monnet@...ronome.com,
        daniel@...earbox.net, davem@...emloft.net, wangnan0@...wei.com,
        alexander.shishkin@...ux.intel.com, mingo@...nel.org,
        acme@...nel.org
Subject: Re: [tools/perf] perf test LLVM failure on 4.9

Em Tue, Jan 23, 2018 at 06:07:25PM +0530, Pintu Kumar escreveu:
> Hi All,
> 
> I am verifying all perf tests on Ubuntu-16 x86-64 platform using the
> kernel version 4.9.20.
> I have installed several others packages including: clang, llvm
> 
> But, when I run 'perf test' I get some FAILURE.
> Specially, 'perf test LLVM' is failing.

Wang, could you please take a look? I'll be traveling this week, so
probably will not have time for trying to work on this.

- Arnaldo
 
> Please check the below error logs:
> 
> ----------------------------------------------------
> # perf test LLVM
> 35: Test LLVM searching and compiling                        :
> 35.1: Basic BPF llvm compiling test                          : FAILED!
> 35.2: Test kbuild searching                                  : Skip
> 35.3: Compile source for BPF prologue generation test        : Skip
> 35.4: Compile source for BPF relocation test                 : Skip
> ----------------------------------------------------
> 
> When I run with -v I get this:
> 
> -----------------------------------------------------
> # perf test -v LLVM
> 35: Test LLVM searching and compiling                        :
> 35.1: Basic BPF llvm compiling test                          :
> --- start ---
> test child forked, pid 3304
> Unablt to get kernel version from uname '4.9-xxxx-amd-x86-64'
> WARNING:        unable to get correct kernel building directory.
> Hint:   Set correct kbuild directory using 'kbuild-dir' option in [llvm]
>         section of ~/.perfconfig or set it to "" to suppress kbuild
>         detection.
> 
> Unablt to get kernel version from uname '4.9-xxxx-amd-x86-64'
> 
> 
> int _version SEC("version") = LINUX_VERSION_CODE;
> ' | $CLANG_EXEC -D__KERNEL__ -D__NR_CPUS__=$NR_CPUS
> -DLINUX_VERSION_CODE=$LINUX_VERSION_CODE $CLANG_OPTIONS
> $KERNEL_INC_OPTIONS -Wno-unused-value -Wno-pointer-sign
> -working-directory $WORKING_DIR -c "$CLANG_SOURCE" -target bpf -O2 -o
> -
> libbpf: 2129190-4a0 doesn't provide kernel version
> Failed to parse test case 'Basic BPF llvm compiling test'
> test child finished with -1
> ---- end ----
> Test LLVM searching and compiling subtest 0: FAILED!
> -----------------------------------------------------
> 
> 
> Basic BPF LLVM compiling test is failing.
> It reports that bpf could not able to read the kernel version from uname.
> Is it because of this that 'perf test LLVM' is failing ?
> 
> My uname says:
> 4.9-xxxx-amd-x86-64
> 
> My kernel version is: 4.9.20 (from Makefile)
> 
> So, I dont think there is any problem with kernel version.
> 
> If any body have come across this problem please let me know how to
> resolve this issue.
> 
> 
> 
> Thank You!
> 
> Regards,
> Pintu