perf report: Show branch type
Subsystems (2)
v5 cover perf report: Show branch type
v5:
---
Mainly the v5 patch series are updated according to comments from Jiri Olsa <[email protected]>.
The kernel part doesn't have functional change. It just solve the merge issue.
In userspace, the functions of branch type counting and branch type name resolving are moved to the new files:
util/branch.c, util/branch.h.
And refactor the branch info printing code for better maintenance.
Not changed (or just fix merge issue):
perf/core: Define the common branch type classification perf/x86/intel: Record branch type
perf record: Create a new option save_type in --branch-filter
New patches:
perf report: Refactor the branch info printing code perf util: Create branch.c/.h for common branch functions
Changed:
perf report: Show branch type statistics for stdio mode perf report: Show branch type in callchain entry
v4:
---
1. Describe the major changes in patch description. Thanks for Peter Zijlstra's reminding.
2. Initialize branch type to 0 in intel_pmu_lbr_read_32 and intel_pmu_lbr_read_64. Remove the invalid else code in intel_pmu_lbr_filter.
v3:
---
1. Move the JCC forward/backward and cross page computing from kernel to userspace.
2. Use lookup table to replace original switch/case processing.
Changed:
perf/core: Define the common branch type classification perf/x86/intel: Record branch type
perf report: Show branch type statistics for stdio mode perf report: Show branch type in callchain entry
Not changed:
perf record: Create a new option save_type in --branch-filter
v2:
---
1. Use 4 bits in perf_branch_entry to record branch type.
2. Pull out some common branch types from FAR_BRANCH. Now the branch types defined in perf_event.h:
Jin Yao (7):
perf/core: Define the common branch type classification perf/x86/intel: Record branch type
perf record: Create a new option save_type in --branch-filter perf report: Refactor the branch info printing code perf util: Create branch.c/.h for common branch functions perf report: Show branch type statistics for stdio mode perf report: Show branch type in callchain entry
arch/x86/events/intel/lbr.c | 53 ++++++++- include/uapi/linux/perf_event.h | 29 ++++- tools/include/uapi/linux/perf_event.h | 29 ++++- tools/perf/Documentation/perf-record.txt | 1 + tools/perf/builtin-report.c | 69 +++++++++++ tools/perf/util/Build | 1 + tools/perf/util/branch.c | 63 ++++++++++ tools/perf/util/branch.h | 23 ++++ tools/perf/util/callchain.c | 194 ++++++++++++++++++++----------- tools/perf/util/callchain.h | 5 +- tools/perf/util/event.h | 3 +- tools/perf/util/hist.c | 5 +- tools/perf/util/machine.c | 26 +++-- tools/perf/util/parse-branch-options.c | 1 + 14 files changed, 415 insertions(+), 87 deletions(-) create mode 100644 tools/perf/util/branch.c create mode 100644 tools/perf/util/branch.h
Signature · 1 line
2.7.4
PATCH v5 1/7 perf/core: Define the common branch type classification
It is often useful to know the branch types while analyzing branch data. For example, a call is very different from a conditional branch.
Currently we have to look it up in binary while the binary may later not be available and even the binary is available but user has to take some time. It is very useful for user to check it directly in perf report.
Perf already has support for disassembling the branch instruction to get the x86 branch type.
To keep consistent on kernel and userspace and make the classification more common, the patch adds the common branch type classification in perf_event.h.
PERF_BR_NONE : unknownPERF_BR_JCC : conditional jumpPERF_BR_JMP : jumpPERF_BR_IND_JMP : indirect jumpPERF_BR_CALL : callPERF_BR_IND_CALL : indirect callPERF_BR_RET : returnPERF_BR_SYSCALL : syscallPERF_BR_SYSRET : syscall returnPERF_BR_IRQ : hw interrupt/trap/faultPERF_BR_INT : sw interruptPERF_BR_IRET : return from interruptPERF_BR_FAR_BRANCH: not generic far branch type
The patch also adds a new field type (4 bits) in perf_branch_entry to record the branch type.
Since the disassembling of branch instruction needs some overhead, a new PERF_SAMPLE_BRANCH_TYPE_SAVE is introduced to indicate if it needs to disassemble the branch instruction and record the branch type.
Change log
----------
v5: Not changed. The v5 patch series just change the userspace.
v4: Comparing to previous version, the major changes are:
1. Remove the PERF_BR_JCC_FWD/PERF_BR_JCC_BWD, they will be computed later in userspace.
2. Remove the "cross" field in perf_branch_entry. The cross page computing will be done later in userspace.
--- include/uapi/linux/perf_event.h | 29 ++++++++++++++++++++++++++++- tools/include/uapi/linux/perf_event.h | 29 ++++++++++++++++++++++++++++- 2 files changed, 56 insertions(+), 2 deletions(-)
include/uapi/linux/perf_event.h +28 -1
@@ -174,6 +174,8 @@ enum perf_branch_sample_type_shift {PERF_SAMPLE_BRANCH_NO_FLAGS_SHIFT =14 ,/* no flags */ PERF_SAMPLE_BRANCH_NO_CYCLES_SHIFT =15 ,/* no cycles */ +PERF_SAMPLE_BRANCH_TYPE_SAVE_SHIFT =16 ,/* save branch type */ + PERF_SAMPLE_BRANCH_MAX_SHIFT /* non-ABI */ };
@@ -198,9 +200,32 @@ enum perf_branch_sample_type {PERF_SAMPLE_BRANCH_NO_FLAGS =1U <<PERF_SAMPLE_BRANCH_NO_FLAGS_SHIFT ,PERF_SAMPLE_BRANCH_NO_CYCLES =1U <<PERF_SAMPLE_BRANCH_NO_CYCLES_SHIFT , +PERF_SAMPLE_BRANCH_TYPE_SAVE = +1U <<PERF_SAMPLE_BRANCH_TYPE_SAVE_SHIFT , + PERF_SAMPLE_BRANCH_MAX = 1U << PERF_SAMPLE_BRANCH_MAX_SHIFT, }; +/* +* Common flow change classification +*/ +enum { +PERF_BR_NONE =0 ,/* unknown */ +PERF_BR_JCC =1 ,/* conditional jump */ +PERF_BR_JMP =2 ,/* jump */ +PERF_BR_IND_JMP =3 ,/* indirect jump */ +PERF_BR_CALL =4 ,/* call */ +PERF_BR_IND_CALL =5 ,/* indirect call */ +PERF_BR_RET =6 ,/* return */ +PERF_BR_SYSCALL =7 ,/* syscall */ +PERF_BR_SYSRET =8 ,/* syscall return */ +PERF_BR_IRQ =9 ,/* hw interrupt/trap/fault */ +PERF_BR_INT =10 ,/* sw interrupt */ +PERF_BR_IRET =11 ,/* return from interrupt */ +PERF_BR_FAR_BRANCH =12 ,/* not generic far branch type */ +PERF_BR_MAX , +}; +#define PERF_SAMPLE_BRANCH_PLM_ALL \ (PERF_SAMPLE_BRANCH_USER|\ PERF_SAMPLE_BRANCH_KERNEL|\
@@ -999,6 +1024,7 @@ union perf_mem_data_src {* in_tx: running in a hardware transaction * abort: aborting a hardware transaction * cycles: cycles from last branch (or 0 if not supported) +* type: branch type */ struct perf_branch_entry {__u64 from;
@@ -1008,7 +1034,8 @@ struct perf_branch_entry { in_tx:1, /* in transaction */ abort:1, /* transaction abort */ cycles:16, /* cycle count to last branch */ - reserved:44; + type:4, /* branch type */ + reserved:40; };#endif /* _UAPI_LINUX_PERF_EVENT_H */
tools/include/uapi/linux/perf_event.h +28 -1
@@ -174,6 +174,8 @@ enum perf_branch_sample_type_shift {PERF_SAMPLE_BRANCH_NO_FLAGS_SHIFT =14 ,/* no flags */ PERF_SAMPLE_BRANCH_NO_CYCLES_SHIFT =15 ,/* no cycles */ +PERF_SAMPLE_BRANCH_TYPE_SAVE_SHIFT =16 ,/* save branch type */ + PERF_SAMPLE_BRANCH_MAX_SHIFT /* non-ABI */ };
@@ -198,9 +200,32 @@ enum perf_branch_sample_type {PERF_SAMPLE_BRANCH_NO_FLAGS =1U <<PERF_SAMPLE_BRANCH_NO_FLAGS_SHIFT ,PERF_SAMPLE_BRANCH_NO_CYCLES =1U <<PERF_SAMPLE_BRANCH_NO_CYCLES_SHIFT , +PERF_SAMPLE_BRANCH_TYPE_SAVE = +1U <<PERF_SAMPLE_BRANCH_TYPE_SAVE_SHIFT , + PERF_SAMPLE_BRANCH_MAX = 1U << PERF_SAMPLE_BRANCH_MAX_SHIFT, }; +/* +* Common flow change classification +*/ +enum { +PERF_BR_NONE =0 ,/* unknown */ +PERF_BR_JCC =1 ,/* conditional jump */ +PERF_BR_JMP =2 ,/* jump */ +PERF_BR_IND_JMP =3 ,/* indirect jump */ +PERF_BR_CALL =4 ,/* call */ +PERF_BR_IND_CALL =5 ,/* indirect call */ +PERF_BR_RET =6 ,/* return */ +PERF_BR_SYSCALL =7 ,/* syscall */ +PERF_BR_SYSRET =8 ,/* syscall return */ +PERF_BR_IRQ =9 ,/* hw interrupt/trap/fault */ +PERF_BR_INT =10 ,/* sw interrupt */ +PERF_BR_IRET =11 ,/* return from interrupt */ +PERF_BR_FAR_BRANCH =12 ,/* not generic far branch type */ +PERF_BR_MAX , +}; +#define PERF_SAMPLE_BRANCH_PLM_ALL \ (PERF_SAMPLE_BRANCH_USER|\ PERF_SAMPLE_BRANCH_KERNEL|\
@@ -999,6 +1024,7 @@ union perf_mem_data_src {* in_tx: running in a hardware transaction * abort: aborting a hardware transaction * cycles: cycles from last branch (or 0 if not supported) +* type: branch type */ struct perf_branch_entry {__u64 from;
@@ -1008,7 +1034,8 @@ struct perf_branch_entry { in_tx:1, /* in transaction */ abort:1, /* transaction abort */ cycles:16, /* cycle count to last branch */ - reserved:44; + type:4, /* branch type */ + reserved:40; };#endif /* _UAPI_LINUX_PERF_EVENT_H */
Signature · 1 line
2.7.4
PATCH v5 2/7 perf/x86/intel: Record branch type
In reply to Jin YaoPerf already has support for disassembling the branch instruction and using the branch type for filtering. The patch just records the branch type in perf_branch_entry.
Before recording, the patch converts the x86 branch type to common branch type.
Change log
----------
v5: Just fix the merge error. No other update.
v4: Comparing to previous version, the major changes are:
1. Uses a lookup table to convert x86 branch type to common branch type.
2. Move the JCC forward/JCC backward and cross page computing to user space.
3. Initialize branch type to 0 in intel_pmu_lbr_read_32 and intel_pmu_lbr_read_64
--- arch/x86/events/intel/lbr.c | 53 ++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 52 insertions(+), 1 deletion(-)
arch/x86/events/intel/lbr.c +52 -1
@@ -109,6 +109,9 @@ enum {X86_BR_ZERO_CALL =1 <<15 ,/* zero length call */ X86_BR_CALL_STACK =1 <<16 ,/* call stack */ X86_BR_IND_JMP =1 <<17 ,/* indirect jump */ + + X86_BR_TYPE_SAVE = 1 << 18,/* indicate to save branch type */ + };#define X86_BR_PLM (X86_BR_USER | X86_BR_KERNEL)
@@ -510,6 +513,7 @@ static void intel_pmu_lbr_read_32(struct cpu_hw_events *cpuc) cpuc->lbr_entries[i].in_tx =0 ; cpuc->lbr_entries[i].abort =0 ; cpuc->lbr_entries[i].cycles =0 ; + cpuc->lbr_entries[i].type =0 ; cpuc->lbr_entries[i].reserved =0 ; } cpuc->lbr_stack.nr = i;
@@ -596,6 +600,7 @@ static void intel_pmu_lbr_read_64(struct cpu_hw_events *cpuc) cpuc->lbr_entries[out].in_tx = in_tx; cpuc->lbr_entries[out].abort = abort; cpuc->lbr_entries[out].cycles = cycles; + cpuc->lbr_entries[out].type =0 ; cpuc->lbr_entries[out].reserved =0 ; out++; }
@@ -673,6 +678,10 @@ static int intel_pmu_setup_sw_lbr_filter(struct perf_event *event)if (br_type &PERF_SAMPLE_BRANCH_CALL ) mask |=X86_BR_CALL |X86_BR_ZERO_CALL ; + +if (br_type &PERF_SAMPLE_BRANCH_TYPE_SAVE ) + mask |=X86_BR_TYPE_SAVE ; +/* * stash actual user request into reg, it may * be used by fixup code for some CPU
@@ -926,6 +935,44 @@ static int branch_type(unsigned long from, unsigned long to, int abort)return ret; } +#define X86_BR_TYPE_MAP_MAX 16 + +static int +common_branch_type (int type) +{ +int i, mask; +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_INT ,/* X86_BR_INT */ +PERF_BR_IRET ,/* X86_BR_IRET */ +PERF_BR_JCC ,/* X86_BR_JCC */ +PERF_BR_JMP ,/* X86_BR_JMP */ +PERF_BR_IRQ ,/* X86_BR_IRQ */ +PERF_BR_IND_CALL ,/* X86_BR_IND_CALL */ +PERF_BR_NONE ,/* X86_BR_ABORT */ +PERF_BR_NONE ,/* X86_BR_IN_TX */ +PERF_BR_NONE ,/* X86_BR_NO_TX */ +PERF_BR_CALL ,/* X86_BR_ZERO_CALL */ +PERF_BR_NONE ,/* X86_BR_CALL_STACK */ +PERF_BR_IND_JMP ,/* X86_BR_IND_JMP */ + }; + + type >>=2 ;/* skip X86_BR_USER and X86_BR_KERNEL */ + mask = ~(~0 <<1 ); + +for (i =0 ; i <X86_BR_TYPE_MAP_MAX ; i++) { +if (type & mask) +return branch_map[i]; + + type >>=1 ; + } + +return PERF_BR_NONE ; +} +/* * implement actual branch filter based on user demand. * Hardware may not exactly satisfy that request, thus
@@ -942,7 +989,8 @@ 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 +1011,9 @@ 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)
Signature · 1 line
2.7.4
PATCH v5 3/7 perf record: Create a new option save_type in --branch-filter
In reply to Jin YaoThe option indicates the kernel to save branch type during sampling.
One example:
perf record -g --branch-filter any,save_type <command>
Change log
----------
v5: Not changed.
--- tools/perf/Documentation/perf-record.txt | 1 + tools/perf/util/parse-branch-options.c | 1 + 2 files changed, 2 insertions(+)
tools/perf/Documentation/perf-record.txt +1 -0
@@ -332,6 +332,7 @@ following filters are defined: - no_tx: only when the target is not in a hardware transaction - abort_tx: only when the target is a hardware transaction abort - cond: conditional branches + - save_type: save branch type during sampling in case binary is not available later + The option requires at least one branch type among any, any_call, any_ret, ind_call, cond.
tools/perf/util/parse-branch-options.c +1 -0
@@ -28,6 +28,7 @@ static const struct branch_mode branch_modes[] = {BRANCH_OPT ("cond" ,PERF_SAMPLE_BRANCH_COND ),BRANCH_OPT ("ind_jmp" ,PERF_SAMPLE_BRANCH_IND_JUMP ),BRANCH_OPT ("call" ,PERF_SAMPLE_BRANCH_CALL ), +BRANCH_OPT ("save_type" ,PERF_SAMPLE_BRANCH_TYPE_SAVE ), BRANCH_END };
Signature · 1 line
2.7.4
PATCH v5 4/7 perf report: Refactor the branch info printing code
In reply to Jin YaoThe branch info such as predicted/cycles/... are printed at the callchain entries.
For example: perf report --branch-history --no-children --stdio
--1.07%--main div.c:39 (predicted:52.4% cycles:1 iterations:17)
main div.c:44 (predicted:52.4% cycles:1)
main div.c:42 (cycles:2)
compute_flag div.c:28 (cycles:2)
compute_flag div.c:27 (cycles:1)
rand rand.c:28 (cycles:1)
rand rand.c:28 (cycles:1)
__random random.c:298 (cycles:1)
__random random.c:297 (cycles:1)
__random random.c:295 (cycles:1)
__random random.c:295 (cycles:1)
__random random.c:295 (cycles:1)But the current code is difficult to maintain and extend. This patch refactors the code for easy maintenance.
Change log
----------
v5: It's a new patch in v5 patch series.
--- tools/perf/util/callchain.c | 106 +++++++++++++++++++------------------------- 1 file changed, 45 insertions(+), 61 deletions(-)
tools/perf/util/callchain.c +45 -61
@@ -1105,83 +1105,67 @@ int callchain_branch_counts(struct callchain_root *root, cycles_count); } +static int count_pri64_printf (int index,const char *str,u64 value, +char *bf,int bfsize) +{ +int printed; + + printed =scnprintf (bf, bfsize, +"%s%s:%" PRId64"" , + (index) ?" " :" (" , str, value); + +return printed; +} + +static int count_float_printf (int index,const char *str,float value, +char *bf,int bfsize) +{ +int printed; + + printed =scnprintf (bf, bfsize, +"%s%s:%.1f%%" , + (index) ?" " :" (" , str, value); + +return printed; +} +static int counts_str_build (char *bf,int bfsize,u64 branch_count,u64 predicted_count,u64 abort_count,u64 cycles_count,u64 iter_count,u64 samples_count) { -double predicted_percent =0.0 ; -const char *null_str ="" ; -char iter_str[32 ]; -char cycle_str[32 ]; -char *istr, *cstr;u64 cycles; +int printed =0 , i =0 ;if (branch_count ==0 )return scnprintf (bf, bfsize," (calltrace)" ); cycles = cycles_count / branch_count; +if (cycles) + printed +=count_pri64_printf (i++,"cycles" , + cycles, + bf + printed, bfsize - printed); -if (iter_count && samples_count) { -if (cycles >0 ) -scnprintf (iter_str,sizeof (iter_str), -" iterations:%" PRId64"" , - iter_count / samples_count); -else -scnprintf (iter_str,sizeof (iter_str), -"iterations:%" PRId64"" , - iter_count / samples_count); - istr = iter_str; - }else - istr = (char *)null_str; - -if (cycles >0 ) { -scnprintf (cycle_str,sizeof (cycle_str), -"cycles:%" PRId64"" , cycles); - cstr = cycle_str; - }else - cstr = (char *)null_str; +if (iter_count && samples_count) + printed +=count_pri64_printf (i++,"iterations" , + iter_count / samples_count, + bf + printed, bfsize - printed); - predicted_percent = predicted_count *100.0 / branch_count; +if (predicted_count < branch_count) + printed +=count_float_printf (i++,"predicted" , + predicted_count *100.0 / branch_count, + bf + printed, bfsize - printed); -if ((predicted_count == branch_count) && (abort_count ==0 )) { -if ((cycles >0 ) || (istr != (char *)null_str)) -return scnprintf (bf, bfsize," (%s%s)" , cstr, istr); -else -return scnprintf (bf, bfsize,"%s" , (char *)null_str); - } - -if ((predicted_count < branch_count) && (abort_count ==0 )) { -if ((cycles >0 ) || (istr != (char *)null_str)) -return scnprintf (bf, bfsize, -" (predicted:%.1f%% %s%s)" , - predicted_percent, cstr, istr); -else { -return scnprintf (bf, bfsize, -" (predicted:%.1f%%)" , - predicted_percent); - } - } - -if ((predicted_count == branch_count) && (abort_count >0 )) { -if ((cycles >0 ) || (istr != (char *)null_str)) -return scnprintf (bf, bfsize, -" (abort:%" PRId64" %s%s)" , - abort_count, cstr, istr); -else -return scnprintf (bf, bfsize, -" (abort:%" PRId64")" , - abort_count); - } +if (abort_count) + printed +=count_float_printf (i++,"abort" , + abort_count *100.0 / branch_count, + bf + printed, bfsize - printed); -if ((cycles >0 ) || (istr != (char *)null_str)) -return scnprintf (bf, bfsize, -" (predicted:%.1f%% abort:%" PRId64" %s%s)" , - predicted_percent, abort_count, cstr, istr); +if (i) +return scnprintf (bf + printed, bfsize - printed,")" ); -return scnprintf (bf, bfsize, -" (predicted:%.1f%% abort:%" PRId64")" , - predicted_percent, abort_count); + bf[0 ] =0 ; +return 0 ; } static int callchain_counts_printf(FILE *fp, char *bf, int bfsize,
Signature · 1 line
2.7.4
Re: [PATCH v5 4/7] perf report: Refactor the branch info printing code
On Wed, Apr 19, 2017 at 11:48:11PM +0800, Jin Yao wrote:
SNIP
tools/perf/util/callchain.c int callchain_branch_counts(struct callchain_root *root, · line 1138
Quoted 13 lines
tools/perf/util/callchain.c +2
-5+static int counts_str_build (char *bf,int bfsize,u64 branch_count,u64 predicted_count,u64 abort_count,u64 cycles_count,u64 iter_count,u64 samples_count) { -double predicted_percent =0.0 ; -const char *null_str ="" ; -char iter_str[32 ]; -char cycle_str[32 ]; -char *istr, *cstr;u64 cycles; +int printed =0 , i =0 ;
I like it, but it looks like the previous code displayed those bits in another order.. I managed to catch this one:
1337c1337
< --0.53%--menu_select menu.c:218 (iterations:6 predicted:0.0%)
---
Quoted 1 line
--0.53%--menu_select menu.c:218 (predicted:0.0% iterations:6)
I think we better keep the current order, which seems to be the goal of the original code as well
this function is perfect candidate for automated test ;-) (something like we did in tests/kmod-path.c)
thanks,
jirka
Re: [PATCH v5 4/7] perf report: Refactor the branch info printing code
In reply to Jin YaoOn Wed, Apr 19, 2017 at 11:48:11PM +0800, Jin Yao wrote:
SNIP
Quoted 35 lines
static int counts_str_build(char *bf, int bfsize,
tools/perf/util/callchain.c +5
-18u64 branch_count, u64 predicted_count, u64 abort_count, u64 cycles_count, u64 iter_count, u64 samples_count) { - double predicted_percent = 0.0; -const char *null_str ="" ; -char iter_str[32 ]; -char cycle_str[32 ]; -char *istr, *cstr; u64 cycles; +int printed =0 , i =0 ;if (branch_count ==0 )return scnprintf (bf, bfsize," (calltrace)" ); cycles = cycles_count / branch_count; +if (cycles) + printed +=count_pri64_printf (i++,"cycles" , + cycles, + bf + printed, bfsize - printed); -if (iter_count && samples_count) { -if (cycles >0 ) -scnprintf (iter_str,sizeof (iter_str), -" iterations:%" PRId64"" , - iter_count / samples_count); -else -scnprintf (iter_str,sizeof (iter_str), -"iterations:%" PRId64"" , - iter_count / samples_count); - istr = iter_str; - }else - istr = (char *)null_str; -
tools/perf/util/callchain.c int callchain_branch_counts(struct callchain_root *root, · line 1152
Quoted 10 lines
tools/perf/util/callchain.c +4
-6-if (cycles >0 ) { -scnprintf (cycle_str,sizeof (cycle_str), -"cycles:%" PRId64"" , cycles); - cstr = cycle_str; - }else - cstr = (char *)null_str; +if (iter_count && samples_count) + printed +=count_pri64_printf (i++,"iterations" , + iter_count / samples_count, + bf + printed, bfsize - printed);
please put the multiline condition code into {} brackets for all of the cases in this function
thanks,
jirka
PATCH v5 5/7 perf util: Create branch.c/.h for common branch functions
In reply to Jin YaoCreate new util/branch.c and util/branch.h to contain the common branch functions. Such as:
branch_type_count(): Count the numbers of branch types branch_type_name() : Return the name of branch type
The branch type is saved in branch_flags.
Change log
----------
v5: It's a new patch in v5 patch series.
--- tools/perf/util/Build | 1 + tools/perf/util/branch.c | 63 ++++++++++++++++++++++++++++++++++++++++++++++++ tools/perf/util/branch.h | 23 ++++++++++++++++++ tools/perf/util/event.h | 3 ++- 4 files changed, 89 insertions(+), 1 deletion(-) create mode 100644 tools/perf/util/branch.c create mode 100644 tools/perf/util/branch.h
tools/perf/util/Build +1 -0
@@ -90,6 +90,7 @@ libperf-y += vsprintf.o libperf-y += drv_configs.o libperf-y += time-utils.o libperf-y += expr-bison.o +libperf-y += branch.o libperf-$(CONFIG_LIBBPF) += bpf-loader.o libperf-$(CONFIG_BPF_PROLOGUE) += bpf-prologue.o
tools/perf/util/branch.c new file +63 -0
63 lines not on this page · raw message
tools/perf/util/branch.h new file +23 -0
@@ -0,0 +1,23 @@ +#ifndef _PERF_BRANCH_H +#define _PERF_BRANCH_H 1 + +#include <stdint.h> +#include "../perf.h" + +struct branch_type_stat { +u64 counts[PERF_BR_MAX ]; +u64 jcc_fwd; +u64 jcc_bwd; +u64 cross_4k; +u64 cross_2m; +}; + +struct branch_flags ; + +void branch_type_count (struct branch_type_stat *stat, +struct branch_flags *flags, +u64 from,u64 to); + +const char *branch_type_name (int type); + +#endif /* _PERF_BRANCH_H */
tools/perf/util/event.h +2 -1
@@ -142,7 +142,8 @@ struct branch_flags { u64 in_tx:1; u64 abort:1; u64 cycles:16; - u64 reserved:44; + u64 type:4; + u64 reserved:40; };struct branch_entry {
Signature · 1 line
2.7.4
PATCH v5 6/7 perf report: Show branch type statistics for stdio mode
In reply to Jin YaoShow the branch type statistics at the end of perf report --stdio.
For example:
perf report --stdio
JCC forward: 27.6%
JCC backward: 10.0%
CROSS_4K: 0.0%
CROSS_2M: 14.3%
JCC: 37.6%
JMP: 0.0%
IND_JMP: 6.5%
CALL: 26.6%
IND_CALL: 0.0%
RET: 29.3%The branch types are:
---------------------
JCC forward: Conditional forward jump
JCC backward: Conditional backward jump
JMP: Jump imm
IND_JMP: Jump reg/mem
CALL: Call imm
IND_CALL: Call reg/mem
RET: Ret
SYSCALL: Syscall
SYSRET: Syscall return
IRQ: HW interrupt/trap/fault
INT: SW interrupt
IRET: Return from interrupt
FAR_BRANCH: Others not generic branch type
CROSS_4K and CROSS_2M:
----------------------
They are the metrics checking for branches cross 4K or 2MB pages. It's an approximate computing. We don't know if the area is 4K or 2MB, so always compute both.
To make the output simple, if a branch crosses 2M area, CROSS_4K will not be incremented.
Change log
----------
v5: Remove the unnecessary sort__mode checking in
hist_iter__branch_callback().
v4: Comparing to previous version, the major changes are:
Add the computing of JCC forward/JCC backward and cross page checking by using the from and to addresses.
--- tools/perf/builtin-report.c | 69 +++++++++++++++++++++++++++++++++++++++++++++ tools/perf/util/hist.c | 5 +--- 2 files changed, 70 insertions(+), 4 deletions(-)
tools/perf/builtin-report.c +69 -0
@@ -38,6 +38,7 @@#include "arch/common.h" #include "util/time-utils.h" #include "util/auxtrace.h" +#include "util/branch.h" #include <dlfcn.h> #include <linux/bitmap.h>
@@ -66,6 +67,7 @@ struct report {u64 queue_size;int socket_filter;DECLARE_BITMAP (cpu_bitmap,MAX_NR_CPUS ); +struct branch_type_stat brtype_stat; };static int report__config (const char *var,const char *value,void *cb)
@@ -144,6 +146,22 @@ static int hist_iter__report_callback(struct hist_entry_iter *iter,return err; } +static int hist_iter__branch_callback (struct hist_entry_iter *iter, +struct addr_location *al__maybe_unused , +bool single__maybe_unused , +void *arg) +{ +struct hist_entry *he = iter->he; +struct report *rep = arg; +struct branch_info *bi; + + bi = he->branch_info; +branch_type_count (&rep->brtype_stat, &bi->flags, + bi->from.addr, bi->to.addr); + +return 0 ; +} + static int process_sample_event(struct perf_tool *tool, union perf_event *event, struct perf_sample *sample,
@@ -182,6 +200,8 @@ static int process_sample_event(struct perf_tool *tool,*/ if (!sample->branch_stack) goto out_put; + + iter.add_entry_cb = hist_iter__branch_callback; iter.ops = &hist_iter_branch; }else if (rep->mem_mode) { iter.ops = &hist_iter_mem;
@@ -369,6 +389,50 @@ static size_t hists__fprintf_nr_sample_events(struct hists *hists, struct reportreturn ret +fprintf (fp,"\n#\n" ); } +static void branch_type_stat_display (FILE *fp,struct branch_type_stat *stat) +{ +u64 total =0 ; +int i; + +for (i =0 ; i <PERF_BR_MAX ; i++) + total += stat->counts[i]; + +if (total ==0 ) +return ; + +fprintf (fp,"\n#" ); +fprintf (fp,"\n# Branch Statistics:" ); +fprintf (fp,"\n#" ); + +if (stat->jcc_fwd >0 ) +fprintf (fp,"\n%12s: %5.1f%%" , +"JCC forward" , +100.0 * (double )stat->jcc_fwd / (double )total); + +if (stat->jcc_bwd >0 ) +fprintf (fp,"\n%12s: %5.1f%%" , +"JCC backward" , +100.0 * (double )stat->jcc_bwd / (double )total); + +if (stat->cross_4k >0 ) +fprintf (fp,"\n%12s: %5.1f%%" , +"CROSS_4K" , +100.0 * (double )stat->cross_4k / (double )total); + +if (stat->cross_2m >0 ) +fprintf (fp,"\n%12s: %5.1f%%" , +"CROSS_2M" , +100.0 * (double )stat->cross_2m / (double )total); + +for (i =0 ; i <PERF_BR_MAX ; i++) { +if (stat->counts[i] >0 ) +fprintf (fp,"\n%12s: %5.1f%%" , +branch_type_name (i), +100.0 * + (double )stat->counts[i] / (double )total); + } +} +static int perf_evlist__tty_browse_hists (struct perf_evlist *evlist,struct report *rep,const char *help)
@@ -404,6 +468,9 @@ static int perf_evlist__tty_browse_hists(struct perf_evlist *evlist,perf_read_values_destroy (&rep->show_threads_values); } +if (sort__mode ==SORT_MODE__BRANCH ) +branch_type_stat_display (stdout, &rep->brtype_stat); +return 0 ; }
@@ -936,6 +1003,8 @@ int cmd_report(int argc, const char **argv)if (has_br_stack && branch_call_mode) symbol_conf.show_branchflag_count = true; +memset (&report.brtype_stat,0 ,sizeof (struct branch_type_stat )); +/* * Branch mode is a tristate: * -1 means default, so decide based on the file having branch data.
tools/perf/util/hist.c +1 -4
@@ -745,12 +745,9 @@ iter_prepare_branch_entry(struct hist_entry_iter *iter, struct addr_location *al }static int -iter_add_single_branch_entry (struct hist_entry_iter *iter, +iter_add_single_branch_entry (struct hist_entry_iter *iter__maybe_unused ,struct addr_location *al__maybe_unused ) { -/* to avoid calling callback function */ - iter->he =NULL ; -return 0 ; }
Signature · 1 line
2.7.4
Re: [PATCH v5 6/7] perf report: Show branch type statistics for stdio mode
On Wed, Apr 19, 2017 at 11:48:13PM +0800, Jin Yao wrote:
SNIP
Quoted 24 lines
tools/perf/builtin-report.c +24
-0+static void branch_type_stat_display (FILE *fp,struct branch_type_stat *stat) +{ +u64 total =0 ; +int i; + +for (i =0 ; i <PERF_BR_MAX ; i++) + total += stat->counts[i]; + +if (total ==0 ) +return ; + +fprintf (fp,"\n#" ); +fprintf (fp,"\n# Branch Statistics:" ); +fprintf (fp,"\n#" ); + +if (stat->jcc_fwd >0 ) +fprintf (fp,"\n%12s: %5.1f%%" , +"JCC forward" , +100.0 * (double )stat->jcc_fwd / (double )total); + +if (stat->jcc_bwd >0 ) +fprintf (fp,"\n%12s: %5.1f%%" , +"JCC backward" , +100.0 * (double )stat->jcc_bwd / (double )total);
tools/perf/builtin-report.c static size_t hists__fprintf_nr_sample_events(struct hists *hists, struct report · line 425
Quoted 10 lines
tools/perf/builtin-report.c +10
-0+ +if (stat->cross_4k >0 ) +fprintf (fp,"\n%12s: %5.1f%%" , +"CROSS_4K" , +100.0 * (double )stat->cross_4k / (double )total); + +if (stat->cross_2m >0 ) +fprintf (fp,"\n%12s: %5.1f%%" , +"CROSS_2M" , +100.0 * (double )stat->cross_2m / (double )total);
{} brackets here as well
thanks,
jirka
Re: [PATCH v5 6/7] perf report: Show branch type statistics for stdio mode
In reply to Jin YaoOn Wed, Apr 19, 2017 at 11:48:13PM +0800, Jin Yao wrote:
SNIP
Quoted 33 lines
tools/perf/builtin-report.c +33
-0+static void branch_type_stat_display (FILE *fp,struct branch_type_stat *stat) +{ +u64 total =0 ; +int i; + +for (i =0 ; i <PERF_BR_MAX ; i++) + total += stat->counts[i]; + +if (total ==0 ) +return ; + +fprintf (fp,"\n#" ); +fprintf (fp,"\n# Branch Statistics:" ); +fprintf (fp,"\n#" ); + +if (stat->jcc_fwd >0 ) +fprintf (fp,"\n%12s: %5.1f%%" , +"JCC forward" , +100.0 * (double )stat->jcc_fwd / (double )total); + +if (stat->jcc_bwd >0 ) +fprintf (fp,"\n%12s: %5.1f%%" , +"JCC backward" , +100.0 * (double )stat->jcc_bwd / (double )total); + +if (stat->cross_4k >0 ) +fprintf (fp,"\n%12s: %5.1f%%" , +"CROSS_4K" , +100.0 * (double )stat->cross_4k / (double )total); + +if (stat->cross_2m >0 ) + fprintf(fp, "\n%12s: %5.1f%%", + "CROSS_2M",
tools/perf/builtin-report.c static size_t hists__fprintf_nr_sample_events(struct hists *hists, struct report · line 434
Quoted 10 lines
tools/perf/builtin-report.c +10
-0+ 100.0 * (double)stat->cross_2m / (double)total); + +for (i =0 ; i <PERF_BR_MAX ; i++) { +if (stat->counts[i] >0 ) +fprintf (fp,"\n%12s: %5.1f%%" , +branch_type_name (i), +100.0 * + (double )stat->counts[i] / (double )total); + } +}
could you please also move this one to that new branch.c file
thanks,
jirka
PATCH v5 7/7 perf report: Show branch type in callchain entry
In reply to Jin YaoShow branch type in callchain entry. The branch type is printed with other LBR information (such as cycles/abort/...).
For example:
perf report --branch-history --stdio --no-children
--23.56%--main div.c:42 (RET CROSS_2M cycles:2)
compute_flag div.c:28 (cycles:2)
compute_flag div.c:27 (RET CROSS_2M cycles:1)
rand rand.c:28 (cycles:1)
rand rand.c:28 (RET CROSS_2M cycles:1)
__random random.c:298 (cycles:1)
__random random.c:297 (JCC backward CROSS_2M cycles:1)
__random random.c:295 (cycles:1)
__random random.c:295 (JCC backward CROSS_2M cycles:1)
__random random.c:295 (cycles:1)
__random random.c:295 (RET CROSS_2M cycles:9)Change log
----------
v5: Rewrite the branch info print code in util/callchain.c.
v4: Comparing to previous version, the major changes are:
Since we have to compute the JCC forward/JCC backward and cross page checking in user space by from and to addresses, while each callchain entry only contains one ip (either from or to), so this patch will append a branch from address to the callchain entry which just contains the to ip.
--- tools/perf/util/callchain.c | 88 ++++++++++++++++++++++++++++++++++++++++----- tools/perf/util/callchain.h | 5 ++- tools/perf/util/machine.c | 26 +++++++++----- 3 files changed, 101 insertions(+), 18 deletions(-)
tools/perf/util/callchain.c +80 -8
@@ -22,6 +22,7 @@#include "sort.h" #include "machine.h" #include "callchain.h" +#include "branch.h" __threadstruct callchain_cursor callchain_cursor;
@@ -467,6 +468,11 @@ fill_node(struct callchain_node *node, struct callchain_cursor *cursor) call->cycles_count = cursor_node->branch_flags.cycles; call->iter_count = cursor_node->nr_loop_iter; call->samples_count = cursor_node->samples; + +branch_type_count (&call->brtype_stat, + &cursor_node->branch_flags, + cursor_node->branch_from, + cursor_node->ip); }list_add_tail (&call->list, &node->val);
@@ -579,6 +585,11 @@ static enum match_result match_chain(struct callchain_cursor_node *node, cnode->cycles_count += node->branch_flags.cycles; cnode->iter_count += node->nr_loop_iter; cnode->samples_count += node->samples; + +branch_type_count (&cnode->brtype_stat, + &node->branch_flags, + node->branch_from, + node->ip); }return MATCH_EQ ;
@@ -813,7 +824,7 @@ merge_chain_branch(struct callchain_cursor *cursor,list_for_each_entry_safe (list, next_list, &src->val, list) {callchain_cursor_append (cursor, list->ip, list->ms.map, list->ms.sym, - false,NULL ,0 ,0 ); + false,NULL ,0 ,0 ,0 );list_del (&list->list);map__zput (list->ms.map);free (list);
@@ -853,7 +864,7 @@ int callchain_merge(struct callchain_cursor *cursor,int callchain_cursor_append (struct callchain_cursor *cursor,u64 ip,struct map *map,struct symbol *sym,bool branch,struct branch_flags *flags, -int nr_loop_iter,int samples) +int nr_loop_iter,int samples,u64 branch_from) {struct callchain_cursor_node *node = *cursor->last;
@@ -877,6 +888,7 @@ int callchain_cursor_append(struct callchain_cursor *cursor,memcpy (&node->branch_flags, flags,sizeof (struct branch_flags )); + node->branch_from = branch_from; cursor->nr++; cursor->last = &node->next;
@@ -1129,10 +1141,63 @@ static int count_float_printf(int index, const char *str, float value,return printed; } +static int count_str_printf (int index,const char *str, +char *bf,int bfsize) +{ +int printed; + + printed =scnprintf (bf, bfsize, +"%s%s" , + (index) ?" " :" (" , str); + +return printed; +} + +static int branch_type_str (struct branch_type_stat *stat, +char *bf,int bfsize) +{ +int i, j =0 , printed =0 ; +u64 total =0 ; + +for (i =0 ; i <PERF_BR_MAX ; i++) + total += stat->counts[i]; + +if (total ==0 ) +return 0 ; + +if (stat->jcc_fwd >0 ) + printed +=count_str_printf (j++,"JCC forward" , + bf + printed, bfsize - printed); + +if (stat->jcc_bwd >0 ) + printed +=count_str_printf (j++,"JCC backward" , + bf + printed, bfsize - printed); + +for (i =0 ; i <PERF_BR_MAX ; i++) { +if (i ==PERF_BR_JCC ) +continue ; + +if (stat->counts[i] >0 ) + printed +=count_str_printf (j++,branch_type_name (i), + bf + printed, bfsize - printed); + } + +if (stat->cross_4k >0 ) + printed +=count_str_printf (j++,"CROSS_4K" , + bf + printed, bfsize - printed); + +if (stat->cross_2m >0 ) + printed +=count_str_printf (j++,"CROSS_2M" , + bf + printed, bfsize - printed); + +return printed; +} +static int counts_str_build (char *bf,int bfsize,u64 branch_count,u64 predicted_count,u64 abort_count,u64 cycles_count, -u64 iter_count,u64 samples_count) +u64 iter_count,u64 samples_count, +struct branch_type_stat *brtype_stat) {u64 cycles;int printed =0 , i =0 ;
@@ -1140,6 +1205,10 @@ static int counts_str_build(char *bf, int bfsize,if (branch_count ==0 )return scnprintf (bf, bfsize," (calltrace)" ); + printed =branch_type_str (brtype_stat, bf, bfsize); +if (printed) + i++; + cycles = cycles_count / branch_count;if (cycles) printed += count_pri64_printf(i++, "cycles",
@@ -1171,13 +1240,14 @@ static int counts_str_build(char *bf, int bfsize,static int callchain_counts_printf (FILE *fp,char *bf,int bfsize,u64 branch_count,u64 predicted_count,u64 abort_count,u64 cycles_count, -u64 iter_count,u64 samples_count) +u64 iter_count,u64 samples_count, +struct branch_type_stat *brtype_stat) { -char str[128 ]; +char str[256 ];counts_str_build (str,sizeof (str), branch_count, predicted_count, abort_count, cycles_count, - iter_count, samples_count); + iter_count, samples_count, brtype_stat);if (fp)return fprintf (fp,"%s" , str);
@@ -1209,7 +1279,8 @@ int callchain_list_counts__printf_value(struct callchain_node *node,return callchain_counts_printf (fp, bf, bfsize, branch_count, predicted_count, abort_count, - cycles_count, iter_count, samples_count); + cycles_count, iter_count, samples_count, + &clist->brtype_stat); }static void free_callchain_node (struct callchain_node *node)
@@ -1334,7 +1405,8 @@ int callchain_cursor__copy(struct callchain_cursor *dst, rc =callchain_cursor_append (dst, node->ip, node->map, node->sym, node->branch, &node->branch_flags, - node->nr_loop_iter, node->samples); + node->nr_loop_iter, node->samples, + node->branch_from);if (rc)break ;
tools/perf/util/callchain.h +4 -1
@@ -7,6 +7,7 @@#include "event.h" #include "map.h" #include "symbol.h" +#include "branch.h" #define HELP_PAD "\t\t\t\t"
@@ -119,6 +120,7 @@ struct callchain_list {u64 cycles_count;u64 iter_count;u64 samples_count; +struct branch_type_stat brtype_stat;char *srcline;struct list_head list; };
@@ -135,6 +137,7 @@ struct callchain_cursor_node {struct symbol *sym;bool branch;struct branch_flags branch_flags; +u64 branch_from;int nr_loop_iter;int samples;struct callchain_cursor_node *next;
@@ -198,7 +201,7 @@ static inline void callchain_cursor_reset(struct callchain_cursor *cursor)int callchain_cursor_append (struct callchain_cursor *cursor,u64 ip,struct map *map,struct symbol *sym,bool branch,struct branch_flags *flags, -int nr_loop_iter,int samples); +int nr_loop_iter,int samples,u64 branch_from);/* Close a cursor writing session. Initialize for the reader */ static inline void callchain_cursor_commit (struct callchain_cursor *cursor)
tools/perf/util/machine.c +17 -9
@@ -1673,7 +1673,8 @@ static int add_callchain_ip(struct thread *thread,bool branch, struct branch_flags *flags, int nr_loop_iter, - int samples) + int samples, + u64 branch_from) { struct addr_location al;
@@ -1726,7 +1727,8 @@ static int add_callchain_ip(struct thread *thread,if (symbol_conf.hide_unresolved && al.sym ==NULL )return 0 ;return callchain_cursor_append (cursor, al.addr, al.map, al.sym, - branch, flags, nr_loop_iter, samples); + branch, flags, nr_loop_iter, samples, + branch_from); } struct branch_info *sample__resolve_bstack(struct perf_sample *sample,
@@ -1805,7 +1807,7 @@ static int resolve_lbr_callchain_sample(struct thread *thread,struct ip_callchain *chain = sample->callchain;int chain_nr =min (max_stack, (int )chain->nr), i;u8 cpumode =PERF_RECORD_MISC_USER ; -u64 ip; +u64 ip, branch_from =0 ;for (i =0 ; i < chain_nr; i++) {if (chain->ips[i] ==PERF_CONTEXT_USER )
@@ -1847,6 +1849,8 @@ static int resolve_lbr_callchain_sample(struct thread *thread, ip = lbr_stack->entries[0 ].to; branch = true; flags = &lbr_stack->entries[0 ].flags; + branch_from = + lbr_stack->entries[0 ].from; } }else {if (j < lbr_nr) {
@@ -1861,12 +1865,15 @@ static int resolve_lbr_callchain_sample(struct thread *thread, ip = lbr_stack->entries[0 ].to; branch = true; flags = &lbr_stack->entries[0 ].flags; + branch_from = + lbr_stack->entries[0 ].from; } } err =add_callchain_ip (thread, cursor, parent, root_al, &cpumode, ip, - branch, flags,0 ,0 ); + branch, flags,0 ,0 , + branch_from);if (err)return (err <0 ) ? err :0 ; }
@@ -1965,19 +1972,20 @@ static int thread__resolve_callchain_sample(struct thread *thread, root_al,NULL , be[i].to, true, &be[i].flags, - nr_loop_iter, 1); + nr_loop_iter,1 , + be[i].from); else err =add_callchain_ip (thread, cursor, parent, root_al,NULL , be[i].to, true, &be[i].flags, -0 ,0 ); +0 ,0 , be[i].from);if (!err) err =add_callchain_ip (thread, cursor, parent, root_al,NULL , be[i].from, true, &be[i].flags, -0 ,0 ); +0 ,0 ,0 );if (err == -EINVAL )break ;if (err)
@@ -2007,7 +2015,7 @@ static int thread__resolve_callchain_sample(struct thread *thread, err =add_callchain_ip (thread, cursor, parent, root_al, &cpumode, ip, - false,NULL ,0 ,0 ); + false,NULL ,0 ,0 ,0 );if (err)return (err <0 ) ? err :0 ;
@@ -2024,7 +2032,7 @@ static int unwind_entry(struct unwind_entry *entry, void *arg)return 0 ;return callchain_cursor_append (cursor, entry->ip, entry->map, entry->sym, - false,NULL ,0 ,0 ); + false,NULL ,0 ,0 ,0 ); } static int thread__resolve_callchain_unwind(struct thread *thread,
Signature · 1 line
2.7.4
Re: [PATCH v5 7/7] perf report: Show branch type in callchain entry
On Wed, Apr 19, 2017 at 11:48:14PM +0800, Jin Yao wrote:
SNIP
Quoted 9 lines
tools/perf/util/callchain.c +9
-0+static int branch_type_str (struct branch_type_stat *stat, +char *bf,int bfsize) +{ +int i, j =0 , printed =0 ; +u64 total =0 ; + +for (i =0 ; i <PERF_BR_MAX ; i++) + total += stat->counts[i]; +
tools/perf/util/callchain.c static int count_float_printf(int index, const char *str, float value, · line 1174
Quoted 10 lines
tools/perf/util/callchain.c +10
-0+if (total ==0 ) +return 0 ; + +if (stat->jcc_fwd >0 ) + printed +=count_str_printf (j++,"JCC forward" , + bf + printed, bfsize - printed); + +if (stat->jcc_bwd >0 ) + printed +=count_str_printf (j++,"JCC backward" , + bf + printed, bfsize - printed);
please move that multiline conditional code inside {} brackets
thanks,
jirka
Re: [PATCH v5 7/7] perf report: Show branch type in callchain entry
Quoted 25 lines · Jiri Olsa
On Wed, Apr 19, 2017 at 11:48:14PM +0800, Jin Yao wrote:
SNIP
Quoted 9 lines
tools/perf/util/callchain.c +9
-0+static int branch_type_str (struct branch_type_stat *stat, +char *bf,int bfsize) +{ +int i, j =0 , printed =0 ; +u64 total =0 ; + +for (i =0 ; i <PERF_BR_MAX ; i++) + total += stat->counts[i]; +tools/perf/util/callchain.c static int count_float_printf(int index, const char *str, float value, · line 1174
Quoted 10 lines
tools/perf/util/callchain.c +10
-0+if (total ==0 ) +return 0 ; + +if (stat->jcc_fwd >0 ) + printed +=count_str_printf (j++,"JCC forward" , + bf + printed, bfsize - printed); + +if (stat->jcc_bwd >0 ) + printed +=count_str_printf (j++,"JCC backward" , + bf + printed, bfsize - printed);please move that multiline conditional code inside {} brackets
Quoted 2 lines
thanks,
jirka
Thanks so much for all of your review comments. I will add the fix to v6.
Thanks
Jin Yao
Re: [PATCH v5 7/7] perf report: Show branch type in callchain entry
In reply to Jin YaoOn Wed, Apr 19, 2017 at 11:48:14PM +0800, Jin Yao wrote:
SNIP
Quoted 41 lines
tools/perf/util/callchain.c +41
-0+static int count_str_printf (int index,const char *str, +char *bf,int bfsize) +{ +int printed; + + printed =scnprintf (bf, bfsize, +"%s%s" , + (index) ?" " :" (" , str); + +return printed; +} + +static int branch_type_str (struct branch_type_stat *stat, +char *bf,int bfsize) +{ +int i, j =0 , printed =0 ; +u64 total =0 ; + +for (i =0 ; i <PERF_BR_MAX ; i++) + total += stat->counts[i]; + +if (total ==0 ) +return 0 ; + +if (stat->jcc_fwd >0 ) + printed +=count_str_printf (j++,"JCC forward" , + bf + printed, bfsize - printed); + +if (stat->jcc_bwd >0 ) + printed +=count_str_printf (j++,"JCC backward" , + bf + printed, bfsize - printed); + +for (i =0 ; i <PERF_BR_MAX ; i++) { +if (i ==PERF_BR_JCC ) +continue ; + +if (stat->counts[i] >0 ) + printed +=count_str_printf (j++,branch_type_name (i), + bf + printed, bfsize - printed); + } +
tools/perf/util/callchain.c static int count_float_printf(int index, const char *str, float value, · line 1194
Quoted 10 lines
tools/perf/util/callchain.c +10
-0+if (stat->cross_4k >0 ) + printed +=count_str_printf (j++,"CROSS_4K" , + bf + printed, bfsize - printed); + +if (stat->cross_2m >0 ) + printed +=count_str_printf (j++,"CROSS_2M" , + bf + printed, bfsize - printed); + +return printed; +}
could you please also move this one to that new branch.c file
thanks,
jirka