1. 23 Nov, 2010 1 commit
    • Rabin Vincent's avatar
      perf symbols: Remove incorrect open-coded container_of() · 02a9d037
      Rabin Vincent authored
      At least on ARM, padding is inserted between rb_node and sym in struct
      symbol_name_rb_node, causing "((void *)sym) - sizeof(struct rb_node)" to
      point inside rb_node rather than to the symbol_name_rb_node.  Fix this
      by converting the code to use container_of().
      
      Cc: Ian Munsie <imunsie@au1.ibm.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: Ming Lei <tom.leiming@gmail.com>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Tom Zanussi <tzanussi@gmail.com>
      LKML-Reference: <20101123163106.GA25677@debian>
      Signed-off-by: default avatarRabin Vincent <rabin@rab.in>
      Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      02a9d037
  2. 22 Nov, 2010 1 commit
    • Arnaldo Carvalho de Melo's avatar
      perf record: Handle restrictive permissions in /proc/{kallsyms,modules} · c1a3a4b9
      Arnaldo Carvalho de Melo authored
      The 59365d13 commit, even being reverted by 33e0d57, showed a non robust
      behavior in 'perf record': it really should just warn the user that some
      functionality will not be available.
      
      The new behavior then becomes:
      
      	[acme@felicio linux]$ ls -la /proc/{kallsyms,modules}
      	-r-------- 1 root root 0 Nov 22 12:19 /proc/kallsyms
      	-r-------- 1 root root 0 Nov 22 12:19 /proc/modules
      	[acme@felicio linux]$ perf record ls -R > /dev/null
      	Couldn't record kernel reference relocation symbol
      	Symbol resolution may be skewed if relocation was used (e.g. kexec).
      	Check /proc/kallsyms permission or run as root.
      	[ perf record: Woken up 1 times to write data ]
      	[ perf record: Captured and wrote 0.004 MB perf.data (~161 samples) ]
      	[acme@felicio linux]$ perf report --stdio
      	[kernel.kallsyms] with build id 77b05e00e64e4de1c9347d83879779b540d69f00 not found, continuing without symbols
      	# Events: 98  cycles
      	#
      	# Overhead  Command    Shared Object                Symbol
      	# ........  .......  ...............  ....................
      	#
      	    48.26%       ls  [kernel]         [k] ffffffff8102b92b
      	    22.49%       ls  libc-2.12.90.so  [.] __strlen_sse2
      	     8.35%       ls  libc-2.12.90.so  [.] __GI___strcoll_l
      	     8.17%       ls  ls               [.]            11580
      	     3.35%       ls  libc-2.12.90.so  [.] _IO_new_file_xsputn
      	     3.33%       ls  libc-2.12.90.so  [.] _int_malloc
      	     1.88%       ls  libc-2.12.90.so  [.] _int_free
      	     0.84%       ls  libc-2.12.90.so  [.] malloc_consolidate
      	     0.84%       ls  libc-2.12.90.so  [.] __readdir64
      	     0.83%       ls  ls               [.] strlen@plt
      	     0.83%       ls  libc-2.12.90.so  [.] __GI_fwrite_unlocked
      	     0.83%       ls  libc-2.12.90.so  [.] __memcpy_sse2
      
      	#
      	# (For a higher level overview, try: perf report --sort comm,dso)
      	#
      [acme@felicio linux]$
      
      It still has the build-ids for DSOs in the maps with hits:
      
      [acme@felicio linux]$ perf buildid-list
      77b05e00e64e4de1c9347d83879779b540d69f00 [kernel.kallsyms]
      09c4a431a4a8b648fcfc2c2bdda70f56050ddff1 /bin/ls
      af75ea9ad951d25e0f038901a11b3846dccb29a4 /lib64/libc-2.12.90.so
      [acme@felicio linux]$
      
      That can be used in another machine to resolve kernel symbols.
      
      Cc: Eugene Teo <eugeneteo@kernel.org>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: Jesper Juhl <jj@chaosbits.net>
      Cc: Marcus Meissner <meissner@suse.de>
      Cc: Mike Galbraith <efault@gmx.de>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Sarah Sharp <sarah.a.sharp@linux.intel.com>
      Cc: Stephane Eranian <eranian@google.com>
      Cc: Tejun Heo <tj@kernel.org>
      Cc: Tom Zanussi <tzanussi@gmail.com>
      LKML-Reference: <new-submission>
      Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      c1a3a4b9
  3. 18 Nov, 2010 6 commits
  4. 16 Nov, 2010 1 commit
  5. 15 Nov, 2010 31 commits