Re: [PATCH 04/26] perf tools: Add filename__decompress function

[Arnaldo Carvalho de Melo]

Em Mon, Sep 14, 2020 at 10:43:26PM +0200, Jiri Olsa escreveu:
> On Mon, Sep 14, 2020 at 12:35:54PM -0300, Arnaldo Carvalho de Melo wrote:
> > Em Sun, Sep 13, 2020 at 11:02:51PM +0200, Jiri Olsa escreveu:
> > > Factor filename__decompress from decompress_kmodule function.
> > > It can decompress files with compressions supported in perf -
> > > xz and gz, the support needs to be compiled in.
> > > 
> > > It will to be used in following changes to get build id out of
> > > compressed elf objects.
> > 
> > This is prep work, can be applied now, done.
> 
> thanks,
> jirka

So, I take that back, one of these decompress patches is causing this:

[root@five ~]# perf list syscalls:sys_enter_open |& tail
lzma: fopen failed on /usr/lib/modules/5.6.19-200.fc31.x86_64/kernel/drivers/acpi/video.ko.xz: 'No such file or directory'
lzma: fopen failed on /usr/lib/modules/5.5.8-200.fc31.x86_64/kernel/net/ipv4/netfilter/nf_reject_ipv4.ko.xz: 'No such file or directory'
lzma: fopen failed on /usr/lib/modules/5.5.9-200.fc31.x86_64/kernel/net/ipv6/netfilter/ip6_tables.ko.xz: 'No such file or directory'
lzma: fopen failed on /usr/lib/modules/5.5.5-200.fc31.x86_64/kernel/drivers/crypto/ccp/ccp.ko.xz: 'No such file or directory'
lzma: fopen failed on /usr/lib/modules/5.4.20-200.fc31.x86_64/kernel/sound/pci/hda/snd-hda-codec.ko.xz: 'No such file or directory'
lzma: fopen failed on /usr/lib/modules/5.5.15-200.fc31.x86_64/kernel/drivers/target/target_core_mod.ko.xz: 'No such file or directory'
lzma: fopen failed on /usr/lib/modules/5.3.7-301.fc31.x86_64/kernel/drivers/iommu/amd_iommu_v2.ko.xz: 'No such file or directory'
lzma: fopen failed on /usr/lib/modules/5.3.7-301.fc31.x86_64/kernel/drivers/media/v4l2-core/videodev.ko.xz: 'No such file or directory'
lzma: fopen failed on /usr/lib/modules/5.6.19-200.fc31.x86_64/kernel/net/ipv4/netfilter/iptable_filter.ko.xz: 'No such file or directory'
  syscalls:sys_enter_open                            [Tracepoint event]
[root@five ~]# perf test 78
78: Check open filename arg using perf trace + vfs_getname          : FAILED!
[root@five ~]#
[root@five ~]# uname -a
Linux five 5.9.0-rc3 #1 SMP Mon Aug 31 08:38:27 -03 2020 x86_64 x86_64 x86_64 GNU/Linux
[root@five ~]#

So I removed them from my local branch, I'll rerun the build tests and
then push perf/core when all tests pass.

The test uses 'perf probe' and I noticed it when processing Masami's
debuginfod patches to make 'perf probe' use it, I thought it was his
patches, looking only at the 'perf test 78' output, but ended up being
the decompress ones.

- Arnaldo