On Wed, Jul 2, 2014 at 12:57 PM, Peter Zijlstra <[email protected]> wrote: > On Mon, Jun 30, 2014 at 04:50:47PM +0800, Yan, Zheng wrote: >> event->attr.branch_sample_type is non-zero no matter branch stack >> is enabled explicitly or is enabled implicitly. we can use it to >> replace intel_pmu_needs_lbr_smpl(). This avoids duplicating code >> that implicitly enables the LBR. > > How so? I grep'ed for a minute but could not find what you're referring > to.
If !(attr->sample_type & PERF_SAMPLE_BRANCH_STACK), then event->attr.branch_type = 0. If the sample_type is set, then branch_type is necessarily non-zero. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
