linux-kernel - Re: perf test vfs

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Date:   Mon, 23 Oct 2017 11:24:09 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Li Zhijian <zhijianx.li@...el.com>
Cc:     linux-kernel@...r.kernel.org, "Li, Philip" <philip.li@...el.com>
Subject: Re: perf test vfs_getname failed

Em Mon, Oct 23, 2017 at 05:38:49PM +0800, Li Zhijian escreveu:
> Those cases can be passed on fedora-26 with the same kernel(and configuration) with rhel7.1
> [root@...alhost perf]# ./perf test vfs_getname
> 60: Add vfs_getname probe to get syscall args filenames   : Ok
> 61: Use vfs_getname probe to get syscall args filenames   : Ok
> 62: Check open filename arg using perf trace + vfs_getname: Ok
> 
> totally, i tested at 3 distro
> 1. fedora-26: OK
> 2. ubuntu 16.04: FAIL
> 3. rhel7.1 beta: FAIL
> 
> Does it means that those cases are related to special distro(require special middle wares) ?

Nope, its supposed to work with all of them, I'll check and try to fix
it.

- Arnaldo
 
> 
> Thanks
> 
> 
> On 10/19/2017 4:31 PM, Li Zhijian wrote:
> > Hi Arnaldo
> > 
> > i encounter some problem when running perf test, the details arelike
> > below:
> > 
> > -----------------------------
> > 
> > [lizj@...l71 perf]$ sudo ./perf test vfs_getname -v
> > 61: Add vfs_getname probe to get syscall args filenames   :
> > --- start ---
> > test child forked, pid 5958
> > Failed to find 'result' in this function.
> >   Error: Failed to add events.
> > test child finished with -1
> > ---- end ----
> > Add vfs_getname probe to get syscall args filenames: FAILED!
> > 62: Use vfs_getname probe to get syscall args filenames   :
> > --- start ---
> > test child forked, pid 5979
> > Failed to find 'result' in this function.
> >   Error: Failed to add events.
> > test child finished with -1
> > ---- end ----
> > Use vfs_getname probe to get syscall args filenames: FAILED!
> > 63: Check open filename arg using perf trace + vfs_getname:
> > --- start ---
> > test child forked, pid 6001
> > Failed to find 'result' in this function.
> >   Error: Failed to add events.
> > test child finished with -1
> > ---- end ----
> > Check open filename arg using perf trace + vfs_getname: FAILED!
> > -----------------------------
> > 
> > my environment:
> > 1. perf features
> > the enabled features are:
> > -----------------------------
> > 
> > Auto-detecting system features:
> > ...                         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: [ OFF ]
> > ...                     libcrypto: [ on  ]
> > ...                     libunwind: [ on  ]
> > ...            libdw-dwarf-unwind: [ on  ]
> > ...                          zlib: [ on  ]
> > ...                          lzma: [ on  ]
> > ...                     get_cpuid: [ on  ]
> > ...                           bpf: [ on  ]
> > -----------------------------
> > 2. host
> > [lizj@...l71 perf]$ cat /etc/redhat-release
> > Red Hat Enterprise Linux Server release 7.1 Beta (Maipo)
> > 
> > 3. kernel
> > [lizj@...l71 perf]$ uname -a
> > Linux rhel71 4.14.0-rc1+ #2 SMP Wed Oct 18 23:49:30 EDT 2017 x86_64
> > x86_64 x86_64 GNU/Linux
> > 
> > if i miss something, fell free to let me know :)
> > 
> > Thanks
> > 
> > Zhijian
> > 
> >