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authorAlexei Starovoitov <ast@fb.com>2016-04-06 18:43:22 -0700
committerDavid S. Miller <davem@davemloft.net>2016-04-07 21:04:26 -0400
commitec5e099d6e941668d121ea9ca7057f4fa00830b0 (patch)
tree4ec273d88501a68ce23eb53649530161a7fa8440 /include/trace/trace_events.h
parentb33b0a1bf69faff89693df49519fa7b459f5d807 (diff)
perf: optimize perf_fetch_caller_regs
avoid memset in perf_fetch_caller_regs, since it's the critical path of all tracepoints. It's called from perf_sw_event_sched, perf_event_task_sched_in and all of perf_trace_##call with this_cpu_ptr(&__perf_regs[..]) which are zero initialized by perpcu init logic and subsequent call to perf_arch_fetch_caller_regs initializes the same fields on all archs, so we can safely drop memset from all of the above cases and move it into perf_ftrace_function_call that calls it with stack allocated pt_regs. Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/trace/trace_events.h')
0 files changed, 0 insertions, 0 deletions