Re: [PATCH perf/core 2/4] perf-probe: Fix to handle aliased symbols in glibc

[Arnaldo Carvalho de Melo]

Em Mon, Mar 02, 2015 at 09:49:53PM +0900, Masami Hiramatsu escreveu:
> With this patch;
>   -----
>   # ./perf probe -x /usr/lib64/libc-2.17.so -V malloc
>   Available variables at malloc
>           @<__libc_malloc+0>
>                   size_t  bytes
>   # ./perf probe -x /usr/lib64/libc-2.17.so -a "malloc bytes"
>   Added new event:
>     probe_libc:malloc    (on malloc in /usr/lib64/libc-2.17.so with bytes)
> 
>   You can now use it in all perf tools, such as:
> 
>           perf record -e probe_libc:malloc -aR sleep 1

> Reported-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>

Humm, not working for me, after the patch:

[root@ssdandy ~]# perf probe -x /usr/lib64/libc-2.17.so -V malloc
Available variables at malloc
        @<__malloc_check_init+96>
                (No matched variables)
[root@ssdandy ~]#

And then the one asking for 'bytes' to be collectd fails.

After processing the other patches I'll try to debug this...

[root@ssdandy ~]# cat /etc/redhat-release 
Red Hat Enterprise Linux Server release 7.0 (Maipo)
[root@ssdandy ~]# rpm -q glibc glibc-debuginfo
glibc-2.17-55.el7_0.3.x86_64
glibc-debuginfo-2.17-55.el7_0.1.x86_64
[root@ssdandy ~]#
[acme@ssdandy linux]$ readelf -Ws /usr/lib64/libc-2.17.so| grep malloc
   438: 00000000000800c0   245 FUNC    GLOBAL DEFAULT   12 __libc_malloc@@GLIBC_2.2.5
   545: 0000000000082320   239 FUNC    GLOBAL DEFAULT   12 malloc_info@@GLIBC_2.10
   810: 00000000000820c0   490 FUNC    WEAK   DEFAULT   12 malloc_stats@@GLIBC_2.2.5
   981: 00000000000802e0   507 FUNC    WEAK   DEFAULT   12 malloc_get_state@@GLIBC_2.2.5
  1077: 00000000003ba740     8 OBJECT  WEAK   DEFAULT   32 __malloc_hook@@GLIBC_2.2.5
  1170: 00000000000800c0   245 FUNC    GLOBAL DEFAULT   12 malloc@@GLIBC_2.2.5
  1204: 0000000000080d30   222 FUNC    WEAK   DEFAULT   12 malloc_usable_size@@GLIBC_2.2.5
  1450: 0000000000081d50   604 FUNC    WEAK   DEFAULT   12 malloc_trim@@GLIBC_2.2.5
  1767: 00000000003bca60     8 OBJECT  WEAK   DEFAULT   33 __malloc_initialize_hook@@GLIBC_2.2.5
  2061: 00000000000814f0  1286 FUNC    WEAK   DEFAULT   12 malloc_set_state@@GLIBC_2.2.5
    95: 00000000003bbaa0     4 OBJECT  LOCAL  DEFAULT   33 cache_malloced
  1004: 0000000000000000     0 FILE    LOCAL  DEFAULT  ABS malloc.c
  1005: 000000000007b060   275 FUNC    LOCAL  DEFAULT   12 ptmalloc_lock_all
  1011: 00000000003bcb30     8 OBJECT  LOCAL  DEFAULT   33 save_malloc_hook
  1013: 00000000000801c0   285 FUNC    LOCAL  DEFAULT   12 malloc_atfork
  1017: 000000000007b180   158 FUNC    LOCAL  DEFAULT   12 ptmalloc_unlock_all2
  1030: 000000000007ba90   174 FUNC    LOCAL  DEFAULT   12 ptmalloc_unlock_all
  1033: 000000000007bb40   232 FUNC    LOCAL  DEFAULT   12 malloc_printerr
  1057: 000000000007c3d0  1518 FUNC    LOCAL  DEFAULT   12 malloc_consolidate
  1089: 000000000007dee0  5195 FUNC    LOCAL  DEFAULT   12 _int_malloc
  1100: 000000000007f330   282 FUNC    LOCAL  DEFAULT   12 malloc_check
  1117: 00000000003bca90     4 OBJECT  LOCAL  DEFAULT   33 disallow_malloc_check
  1118: 00000000003bcaa0     4 OBJECT  LOCAL  DEFAULT   33 using_malloc_checking
  1136: 0000000000080fe0  1015 FUNC    LOCAL  DEFAULT   12 ptmalloc_init.part.8
  1138: 00000000000813e0    21 FUNC    LOCAL  DEFAULT   12 ptmalloc_init
  1139: 0000000000081400    60 FUNC    LOCAL  DEFAULT   12 malloc_hook_ini
  1160: 0000000000082fc0   495 FUNC    LOCAL  DEFAULT   12 mallochook
  1162: 00000000003bcbf0     8 OBJECT  LOCAL  DEFAULT   33 old_malloc_hook
  1181: 00000000003bcc40     8 OBJECT  LOCAL  DEFAULT   33 tr_old_malloc_hook
  1182: 0000000000083fc0   189 FUNC    LOCAL  DEFAULT   12 tr_mallochook
  1194: 00000000003bcc60     8 OBJECT  LOCAL  DEFAULT   33 malloc_trace_buffer
  3673: 00000000003ba170     4 OBJECT  LOCAL  DEFAULT   32 __libc_malloc_initialized
  3734: 00000000000814f0  1286 FUNC    LOCAL  DEFAULT   12 __malloc_set_state
  4047: 0000000000080d30   222 FUNC    LOCAL  DEFAULT   12 __malloc_usable_size
  4101: 0000000000081d50   604 FUNC    LOCAL  DEFAULT   12 __malloc_trim
  4338: 00000000000800c0   245 FUNC    LOCAL  DEFAULT   12 __GI___libc_malloc
  4531: 00000000000802e0   507 FUNC    LOCAL  DEFAULT   12 __malloc_get_state
  4569: 00000000000820c0   490 FUNC    LOCAL  DEFAULT   12 __malloc_stats
  4849: 0000000000080050   107 FUNC    LOCAL  DEFAULT   12 __malloc_check_init
  5351: 00000000000800c0   245 FUNC    LOCAL  DEFAULT   12 __malloc
  5490: 00000000003bca60     8 OBJECT  WEAK   DEFAULT   33 __malloc_initialize_hook
  5571: 00000000000814f0  1286 FUNC    WEAK   DEFAULT   12 malloc_set_state
  5868: 00000000000800c0   245 FUNC    GLOBAL DEFAULT   12 malloc
  5878: 0000000000082320   239 FUNC    GLOBAL DEFAULT   12 malloc_info
  5988: 0000000000081d50   604 FUNC    WEAK   DEFAULT   12 malloc_trim
  6526: 00000000003ba740     8 OBJECT  WEAK   DEFAULT   32 __malloc_hook
  6615: 0000000000080d30   222 FUNC    WEAK   DEFAULT   12 malloc_usable_size
  7087: 00000000000802e0   507 FUNC    WEAK   DEFAULT   12 malloc_get_state
  7104: 00000000000800c0   245 FUNC    GLOBAL DEFAULT   12 __libc_malloc
  7271: 00000000000820c0   490 FUNC    WEAK   DEFAULT   12 malloc_stats
[acme@ssdandy linux]$

- Arnaldo
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