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The low level index of raw branch records for the most recent branch can be recorded in a sample with PERF_SAMPLE_BRANCH_HW_INDEX branch_sample_type. Extend struct branch_stack to support it. However, if the PERF_SAMPLE_BRANCH_HW_INDEX is not applied, only nr and entries[] will be output by kernel. The pointer of entries[] could be wrong, since the output format is different with new struct branch_stack. Add a variable no_hw_idx in struct perf_sample to indicate whether the hw_idx is output. Add get_branch_entry() to return corresponding pointer of entries[0]. To make dummy branch sample consistent as new branch sample, add hw_idx in struct dummy_branch_stack for cs-etm and intel-pt. Apply the new struct branch_stack for synthetic events as well. Extend test case sample-parsing to support new struct branch_stack. Committer notes: Renamed get_branch_entries() to perf_sample__branch_entries() to have proper namespacing and pave the way for this to be moved to libperf, eventually. Add 'static' to that inline as it is in a header. Add 'hw_idx' to 'struct dummy_branch_stack' in cs-etm.c to fix the build on arm64. Signed-off-by: Kan Liang <kan.liang@linux.intel.com> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Alexey Budankov <alexey.budankov@linux.intel.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Mathieu Poirier <mathieu.poirier@linaro.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Pavel Gerasimov <pavel.gerasimov@intel.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ravi Bangoria <ravi.bangoria@linux.ibm.com> Cc: Stephane Eranian <eranian@google.com> Cc: Vitaly Slobodskoy <vitaly.slobodskoy@intel.com> Link: http://lore.kernel.org/lkml/20200228163011.19358-2-kan.liang@linux.intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
84 lines
2.0 KiB
C
84 lines
2.0 KiB
C
#ifndef _PERF_BRANCH_H
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#define _PERF_BRANCH_H 1
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/*
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* The linux/stddef.h isn't need here, but is needed for __always_inline used
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* in files included from uapi/linux/perf_event.h such as
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* /usr/include/linux/swab.h and /usr/include/linux/byteorder/little_endian.h,
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* detected in at least musl libc, used in Alpine Linux. -acme
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*/
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#include <stdio.h>
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#include <stdint.h>
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#include <linux/compiler.h>
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#include <linux/stddef.h>
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#include <linux/perf_event.h>
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#include <linux/types.h>
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#include "event.h"
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struct branch_flags {
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u64 mispred:1;
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u64 predicted:1;
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u64 in_tx:1;
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u64 abort:1;
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u64 cycles:16;
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u64 type:4;
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u64 reserved:40;
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};
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struct branch_info {
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struct addr_map_symbol from;
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struct addr_map_symbol to;
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struct branch_flags flags;
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char *srcline_from;
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char *srcline_to;
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};
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struct branch_entry {
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u64 from;
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u64 to;
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struct branch_flags flags;
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};
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struct branch_stack {
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u64 nr;
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u64 hw_idx;
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struct branch_entry entries[0];
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};
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/*
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* The hw_idx is only available when PERF_SAMPLE_BRANCH_HW_INDEX is applied.
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* Otherwise, the output format of a sample with branch stack is
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* struct branch_stack {
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* u64 nr;
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* struct branch_entry entries[0];
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* }
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* Check whether the hw_idx is available,
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* and return the corresponding pointer of entries[0].
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*/
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static inline struct branch_entry *perf_sample__branch_entries(struct perf_sample *sample)
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{
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u64 *entry = (u64 *)sample->branch_stack;
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entry++;
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if (sample->no_hw_idx)
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return (struct branch_entry *)entry;
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return (struct branch_entry *)(++entry);
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}
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struct branch_type_stat {
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bool branch_to;
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u64 counts[PERF_BR_MAX];
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u64 cond_fwd;
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u64 cond_bwd;
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u64 cross_4k;
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u64 cross_2m;
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};
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void branch_type_count(struct branch_type_stat *st, struct branch_flags *flags,
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u64 from, u64 to);
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const char *branch_type_name(int type);
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void branch_type_stat_display(FILE *fp, struct branch_type_stat *st);
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int branch_type_str(struct branch_type_stat *st, char *bf, int bfsize);
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#endif /* _PERF_BRANCH_H */
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