• Frederic Weisbecker's avatar
    perf: Generalize some arch callchain code · 56962b44
    Frederic Weisbecker authored
    - Most archs use one callchain buffer per cpu, except x86 that needs
      to deal with NMIs. Provide a default perf_callchain_buffer()
      implementation that x86 overrides.
    
    - Centralize all the kernel/user regs handling and invoke new arch
      handlers from there: perf_callchain_user() / perf_callchain_kernel()
      That avoid all the user_mode(), current->mm checks and so...
    
    - Invert some parameters in perf_callchain_*() helpers: entry to the
      left, regs to the right, following the traditional (dst, src).
    Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
    Acked-by: default avatarPaul Mackerras <paulus@samba.org>
    Tested-by: default avatarWill Deacon <will.deacon@arm.com>
    Cc: Ingo Molnar <mingo@elte.hu>
    Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
    Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
    Cc: Stephane Eranian <eranian@google.com>
    Cc: David Miller <davem@davemloft.net>
    Cc: Paul Mundt <lethal@linux-sh.org>
    Cc: Borislav Petkov <bp@amd64.org>
    56962b44
perf_event.c 78.5 KB