Messages in this thread | | | Date | Wed, 3 Oct 2012 15:30:07 +0200 | From | Jiri Olsa <> | Subject | Re: [PATCHv4] perf x86_64: Fix rsp register for system call fast path |
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On Wed, Oct 03, 2012 at 03:22:17PM +0200, Peter Zijlstra wrote: > On Wed, 2012-10-03 at 15:13 +0200, Jiri Olsa wrote: > > @@ -1190,8 +1191,8 @@ static inline void perf_sample_data_init(struct > > perf_sample_data *data, > > data->raw = NULL; > > data->br_stack = NULL; > > data->period = period; > > - data->regs_user.abi = PERF_SAMPLE_REGS_ABI_NONE; > > - data->regs_user.regs = NULL; > > + /* Sets abi to PERF_SAMPLE_REGS_ABI_NONE. */ > > + memset(&data->regs_user, 0, sizeof(data->regs_user)); > > data->stack_user_size = 0; > > } > > Hmm, this will slow down all events, regardless of whether they use any > of that stuff or not. Since the one user actually does something like: > > data->regs_user = *pt_regs; > > except it does a memcpy() for some obscure reason, it really doesn't > matter what is in there when uninitialized, right?
right, the init can stay as it was
jirka
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