• Arnaldo Carvalho de Melo's avatar
    perf symbols: Handle /proc/sys/kernel/kptr_restrict · ec80fde7
    Arnaldo Carvalho de Melo authored
    Perf uses /proc/modules to figure out where kernel modules are loaded.
    
    With the advent of kptr_restrict, non root users get zeroes for all module
    start addresses.
    
    So check if kptr_restrict is non zero and don't generate the syntethic
    PERF_RECORD_MMAP events for them.
    
    Warn the user about it in perf record and in perf report.
    
    In perf report the reference relocation symbol being zero means that
    kptr_restrict was set, thus /proc/kallsyms has only zeroed addresses, so don't
    use it to fixup symbol addresses when using a valid kallsyms (in the buildid
    cache) or vmlinux (in the vmlinux path) build-id located automatically or
    specified by the user.
    
    Provide an explanation about it in 'perf report' if kernel samples were taken,
    checking if a suitable vmlinux or kallsyms was found/specified.
    
    Restricted /proc/kallsyms don't go to the buildid cache anymore.
    
    Example:
    
     [acme@emilia ~]$ perf record -F 100000 sleep 1
    
     WARNING: Kernel address maps (/proc/{kallsyms,modules}) are restricted, check
     /proc/sys/kernel/kptr_restrict.
    
     Samples in kernel functions may not be resolved if a suitable vmlinux file is
     not found in the buildid cache or in the vmlinux path.
    
     Samples in kernel modules won't be resolved at all.
    
     If some relocation was applied (e.g. kexec) symbols may be misresolved even
     with a suitable vmlinux or kallsyms file.
    
     [ perf record: Woken up 1 times to write data ]
     [ perf record: Captured and wrote 0.005 MB perf.data (~231 samples) ]
     [acme@emilia ~]$
    
     [acme@emilia ~]$ perf report --stdio
     Kernel address maps (/proc/{kallsyms,modules}) were restricted,
     check /proc/sys/kernel/kptr_restrict before running 'perf record'.
    
     If some relocation was applied (e.g. kexec) symbols may be misresolved.
    
     Samples in kernel modules can't be resolved as well.
    
     # Events: 13  cycles
     #
     # Overhead  Command      Shared Object                 Symbol
     # ........  .......  .................  .....................
     #
        20.24%    sleep  [kernel.kallsyms]  [k] page_fault
        20.04%    sleep  [kernel.kallsyms]  [k] filemap_fault
        19.78%    sleep  [kernel.kallsyms]  [k] __lru_cache_add
        19.69%    sleep  ld-2.12.so         [.] memcpy
        14.71%    sleep  [kernel.kallsyms]  [k] dput
         4.70%    sleep  [kernel.kallsyms]  [k] flush_signal_handlers
         0.73%    sleep  [kernel.kallsyms]  [k] perf_event_comm
         0.11%    sleep  [kernel.kallsyms]  [k] native_write_msr_safe
    
     #
     # (For a higher level overview, try: perf report --sort comm,dso)
     #
     [acme@emilia ~]$
    
    This is because it found a suitable vmlinux (build-id checked) in
    /lib/modules/2.6.39-rc7+/build/vmlinux (use -v in perf report to see the long
    file name).
    
    If we remove that file from the vmlinux path:
    
     [root@emilia ~]# mv /lib/modules/2.6.39-rc7+/build/vmlinux \
    		     /lib/modules/2.6.39-rc7+/build/vmlinux.OFF
     [acme@emilia ~]$ perf report --stdio
     [kernel.kallsyms] with build id 57298cdbe0131f6871667ec0eaab4804dcf6f562
     not found, continuing without symbols
    
     Kernel address maps (/proc/{kallsyms,modules}) were restricted, check
     /proc/sys/kernel/kptr_restrict before running 'perf record'.
    
     As no suitable kallsyms nor vmlinux was found, kernel samples can't be
     resolved.
    
     Samples in kernel modules can't be resolved as well.
    
     # Events: 13  cycles
     #
     # Overhead  Command      Shared Object  Symbol
     # ........  .......  .................  ......
     #
        80.31%    sleep  [kernel.kallsyms]  [k] 0xffffffff8103425a
        19.69%    sleep  ld-2.12.so         [.] memcpy
    
     #
     # (For a higher level overview, try: perf report --sort comm,dso)
     #
     [acme@emilia ~]$
    Reported-by: default avatarStephane Eranian <eranian@google.com>
    Suggested-by: default avatarDavid Miller <davem@davemloft.net>
    Cc: Dave Jones <davej@redhat.com>
    Cc: David Miller <davem@davemloft.net>
    Cc: Frederic Weisbecker <fweisbec@gmail.com>
    Cc: Ingo Molnar <mingo@elte.hu>
    Cc: Kees Cook <kees.cook@canonical.com>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: Mike Galbraith <efault@gmx.de>
    Cc: Paul Mackerras <paulus@samba.org>
    Cc: Pekka Enberg <penberg@cs.helsinki.fi>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Stephane Eranian <eranian@google.com>
    Cc: Tom Zanussi <tzanussi@gmail.com>
    Link: http://lkml.kernel.org/n/tip-mt512joaxxbhhp1odop04yit@git.kernel.orgSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
    ec80fde7
symbol.c 60.4 KB