Messages in this thread | | | Date | Mon, 17 Jul 2017 10:11:12 +0200 | From | Jiri Olsa <> | Subject | Re: [PATCH v9 2/7] perf/x86/intel: Record branch type |
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On Mon, Jul 17, 2017 at 07:06:38PM +0800, Jin Yao wrote:
SNIP
> +#define X86_BR_TYPE_MAP_MAX 16 > + > +static int > +common_branch_type(int type) > +{ > + int i; > + const int branch_map[X86_BR_TYPE_MAP_MAX] = { > + PERF_BR_CALL, /* X86_BR_CALL */ > + PERF_BR_RET, /* X86_BR_RET */ > + PERF_BR_SYSCALL, /* X86_BR_SYSCALL */ > + PERF_BR_SYSRET, /* X86_BR_SYSRET */ > + PERF_BR_UNKNOWN, /* X86_BR_INT */ > + PERF_BR_UNKNOWN, /* X86_BR_IRET */ > + PERF_BR_COND, /* X86_BR_JCC */ > + PERF_BR_UNCOND, /* X86_BR_JMP */ > + PERF_BR_UNKNOWN, /* X86_BR_IRQ */ > + PERF_BR_IND_CALL, /* X86_BR_IND_CALL */ > + PERF_BR_UNKNOWN, /* X86_BR_ABORT */ > + PERF_BR_UNKNOWN, /* X86_BR_IN_TX */ > + PERF_BR_UNKNOWN, /* X86_BR_NO_TX */ > + PERF_BR_CALL, /* X86_BR_ZERO_CALL */ > + PERF_BR_UNKNOWN, /* X86_BR_CALL_STACK */ > + PERF_BR_IND, /* X86_BR_IND_JMP */ > + };
should the branch_map array be static? having it on stack makes the compiler to create it every time we call the function
jirka
> + > + type >>= 2; /* skip X86_BR_USER and X86_BR_KERNEL */ > + > + if (type) { > + i = __ffs(type); > + if (i < X86_BR_TYPE_MAP_MAX) > + return branch_map[i]; > + } > + > + return PERF_BR_UNKNOWN; > +} > + > /* > * implement actual branch filter based on user demand. > * Hardware may not exactly satisfy that request, thus > @@ -942,7 +987,8 @@ intel_pmu_lbr_filter(struct cpu_hw_events *cpuc) > bool compress = false; > > /* if sampling all branches, then nothing to filter */ > - if ((br_sel & X86_BR_ALL) == X86_BR_ALL) > + if (((br_sel & X86_BR_ALL) == X86_BR_ALL) && > + ((br_sel & X86_BR_TYPE_SAVE) != X86_BR_TYPE_SAVE)) > return; > > for (i = 0; i < cpuc->lbr_stack.nr; i++) { > @@ -963,6 +1009,9 @@ intel_pmu_lbr_filter(struct cpu_hw_events *cpuc) > cpuc->lbr_entries[i].from = 0; > compress = true; > } > + > + if ((br_sel & X86_BR_TYPE_SAVE) == X86_BR_TYPE_SAVE) > + cpuc->lbr_entries[i].type = common_branch_type(type); > } > > if (!compress) > -- > 2.7.4 >
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