perf report: Show branch type
Subsystems (2)
v3 cover perf report: Show branch type
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:
PERF_BR_NONE : unknownPERF_BR_JCC_FWD : conditional forward jumpPERF_BR_JCC_BWD : conditional backward 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: others not generic far branch type
3. Use 2 bits in perf_branch_entry for a "cross" metrics checking for branch cross 4K or 2M area. It's an approximate computing for checking if the branch cross 4K page or 2MB page.
For example:
perf record -g --branch-filter any,save_type <command>
perf report --stdio
JCC forward: 27.7%
JCC backward: 9.8%
JMP: 0.0%
IND_JMP: 6.5%
CALL: 26.6%
IND_CALL: 0.0%
RET: 29.3%
IRET: 0.0%
CROSS_4K: 0.0%
CROSS_2M: 14.3%perf report --branch-history --stdio --no-children
-23.60%--main div.c:42 (RET cycles:2)
compute_flag div.c:28 (RET cycles:2) compute_flag div.c:27 (RET CROSS_2M cycles:1) rand rand.c:28 (RET CROSS_2M cycles:1) rand rand.c:28 (RET cycles:1) __random random.c:298 (RET cycles:1) __random random.c:297 (JCC forward cycles:1) __random random.c:295 (JCC forward cycles:1) __random random.c:295 (JCC forward cycles:1) __random random.c:295 (JCC forward cycles:1) __random random.c:295 (RET cycles:9)
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
v1:
---
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 branch type.
The patch series records the branch type and show the branch type with other LBR information in callchain entry via perf report. The patch series also adds the branch type summary at the end of
perf report --stdio.
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.
The common 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
FAR_BRANCH: SYSCALL/SYSRET, IRQ, IRET, TSX Abort
An example:
1. Record branch type (new option "save_type")
perf record -g --branch-filter any,save_type <command>
2. Show the branch type statistics at the end of perf report --stdio
perf report --stdio
JCC forward: 34.0%
JCC backward: 3.6%
JMP: 0.0%
IND_JMP: 6.5%
CALL: 26.6%
IND_CALL: 0.0%
RET: 29.3%
FAR_BRANCH: 0.0%3. Show branch type in callchain entry
perf report --branch-history --stdio --no-children
--23.91%--main div.c:42 (RET cycles:2)
compute_flag div.c:28 (RET cycles:2) compute_flag div.c:27 (RET cycles:1) rand rand.c:28 (RET cycles:1)
rand rand.c:28 (RET cycles:1) __random random.c:298 (RET cycles:1) __random random.c:297 (JCC forward cycles:1) __random random.c:295 (JCC forward cycles:1) __random random.c:295 (JCC forward cycles:1) __random random.c:295 (JCC forward cycles:1) __random random.c:295 (RET cycles:9)
Jin Yao (5):
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: 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 | 70 +++++++++++ tools/perf/util/callchain.c | 195 +++++++++++++++++++++---------- tools/perf/util/callchain.h | 4 +- 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 + tools/perf/util/util.c | 59 ++++++++++ tools/perf/util/util.h | 17 +++ 13 files changed, 411 insertions(+), 81 deletions(-)
Signature · 1 line
2.7.4
PATCH v3 1/5 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
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.
--- 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 v3 2/5 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 classification to common branch classification.
--- 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)
@@ -670,6 +673,10 @@ 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
@@ -923,6 +930,44 @@ 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
@@ -939,7 +984,8 @@ 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++) {
@@ -960,6 +1006,11 @@ 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); +else + cpuc->lbr_entries[i].type =PERF_BR_NONE ; }if (!compress)
Signature · 1 line
2.7.4
Peter Zijlstra
maintainerRe: [PATCH v3 2/5] perf/x86/intel: Record branch type
Quoted 6 lines · Jin Yao
Perf 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 classification to common branch classification.
This is still a completely inadequate changelog. I really will not accept patches like this.
Quoted 101 lines
Signed-off-by Jin Yao <[email protected]>--- 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)@@ -670,6 +673,10 @@ 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 @@ -923,6 +930,44 @@ 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 @@ -939,7 +984,8 @@ 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++) {@@ -960,6 +1006,11 @@ 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); +else + cpuc->lbr_entries[i].type =PERF_BR_NONE ; }if (!compress)Signature · 1 line
2.7.4
Re: [PATCH v3 2/5] perf/x86/intel: Record branch type
Quoted 3 lines · Peter Zijlstra
This is still a completely inadequate changelog. I really will not accept patches like this.
Hi,
The changelog is added in the cover-letter ("[PATCH v3 0/5] perf report: Show branch type").
Does the changelog need to be added in each patch's description?
That's fine, I can add and resend this patch.
Thanks
Jin Yao
Peter Zijlstra
maintainerRe: [PATCH v3 2/5] perf/x86/intel: Record branch type
Quoted 6 lines · Yao
Quoted 3 lines · Peter Zijlstra
This is still a completely inadequate changelog. I really will not accept patches like this.
Quoted 7 lines
Hi,
The changelog is added in the cover-letter ("[PATCH v3 0/5] perf report: Show branch type").
Does the changelog need to be added in each patch's description?
That's fine, I can add and resend this patch.
The cover letter is not retained; it is throw away information.
Each patch should have a coherent changelog that explain why the patch was done and explain non trivial things in the implementation.
Simply copy/pasting the same story in multiple patches is not right either, for the simple fact that the patches were not the same. You did a different thing, so you need a different story.
Re: [PATCH v3 2/5] perf/x86/intel: Record branch type
Quoted 13 lines · Peter Zijlstra
Quoted 5 lines · Yao
Quoted 3 lines · Peter Zijlstra
This is still a completely inadequate changelog. I really will not accept patches like this.
Quoted 7 lines
Hi,
The changelog is added in the cover-letter ("[PATCH v3 0/5] perf report: Show branch type").
Does the changelog need to be added in each patch's description?
That's fine, I can add and resend this patch.
Quoted 11 lines
The cover letter is not retained; it is throw away information.
Each patch should have a coherent changelog that explain why the patch was done and explain non trivial things in the implementation.
Simply copy/pasting the same story in multiple patches is not right either, for the simple fact that the patches were not the same. You did a different thing, so you need a different story.
Thanks so much for the suggestion!
I accept this and decide to make changes on my patch description. Maybe not adding a full change-log, I will add a section in patch description to describe the major changes from previous version.
Thanks
Jin Yao
Peter Zijlstra
maintainerRe: [PATCH v3 2/5] perf/x86/intel: Record branch type
In reply to Peter ZijlstraQuoted 12 lines · Peter Zijlstra
Review intel_pmu_lbr_filter(struct cpu_hw_events *cpuc) · line 1014
Quoted 10 lines · Jin Yao
(quoted diff) +5
-0@@ -960,6 +1006,11 @@ 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); + else + cpuc->lbr_entries[i].type = PERF_BR_NONE; }
I was wondering WTH you did that else; because it should already be 0 (aka, BR_NONE). Then I found intel_pmu_lbr_read_32() is already broken, and you just broke intel_pmu_lbr_read_64().
Arguably we should add a union on the last __u64 with a name for the entire thing, but the below is the minimal fix.
---
Subject: perf,x86: Avoid exposing wrong/stale data in intel_pmu_lbr_read_32()
From: Peter Zijlstra <[email protected]>
Date: Tue Apr 11 10:10:28 CEST 2017
When the perf_branch_entry::{in_tx,abort,cycles} fields were added, intel_pmu_lbr_read_32() wasn't updated to initialize them.
---
arch/x86/events/intel/lbr.c +3 -0
@@ -507,6 +507,9 @@ static void intel_pmu_lbr_read_32(struct cpuc->lbr_entries[i].to = msr_lastbranch.to; cpuc->lbr_entries[i].mispred =0 ; cpuc->lbr_entries[i].predicted =0 ; + cpuc->lbr_entries[i].in_tx =0 ; + cpuc->lbr_entries[i].abort =0 ; + cpuc->lbr_entries[i].cycles =0 ; cpuc->lbr_entries[i].reserved =0 ; } cpuc->lbr_stack.nr = i;
Re: [PATCH v3 2/5] perf/x86/intel: Record branch type
Quoted 14 lines · Peter Zijlstra
Quoted 11 lines · Peter Zijlstra
Review intel_pmu_lbr_filter(struct cpu_hw_events *cpuc) · line 1014
Quoted 10 lines · Jin Yao
(quoted diff) +5
-0@@ -960,6 +1006,11 @@ 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); + else + cpuc->lbr_entries[i].type = PERF_BR_NONE; }I was wondering WTH you did that else; because it should already be 0 (aka,
BR_NONE).
Yes. I will remove the else code. Thanks!
Quoted 20 lines
Then I found
intel_pmu_lbr_read_32()is already broken, and you just brokeintel_pmu_lbr_read_64().Arguably we should add a union on the last
__u64with a name for the entire thing, but the below is the minimal fix.---
Subject: perf,x86: Avoid exposing wrong/stale data inintel_pmu_lbr_read_32()
From: Peter Zijlstra <[email protected]>
Date: Tue Apr 11 10:10:28 CEST 2017When the perf_branch_entry::{in_tx,abort,cycles} fields were added,
intel_pmu_lbr_read_32()wasn't updated to initialize them.Fixes 135c5612c460 ("perf/x86/intel: Support Haswell/v4 LBR format")Signed-off-by Peter Zijlstra (Intel) <[email protected]>---
arch/x86/events/intel/lbr.c static void intel_pmu_lbr_read_32(struct · line 515
Quoted 9 lines
arch/x86/events/intel/lbr.c +3
-0@@ -507,6 +507,9 @@ static void intel_pmu_lbr_read_32(struct cpuc->lbr_entries[i].to = msr_lastbranch.to; cpuc->lbr_entries[i].mispred =0 ; cpuc->lbr_entries[i].predicted =0 ; + cpuc->lbr_entries[i].in_tx =0 ; + cpuc->lbr_entries[i].abort =0 ; + cpuc->lbr_entries[i].cycles =0 ; cpuc->lbr_entries[i].reserved =0 ; } cpuc->lbr_stack.nr = i;
I will add cpuc->lbr_entries[i].type = 0 in my patch.
PATCH v3 3/5 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>
--- 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 v3 4/5 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: 27.8%
JCC backward: 9.7%
CROSS_4K: 0.0%
CROSS_2M: 14.3%
JCC: 37.6%
JMP: 0.0%
IND_JMP: 6.5%
CALL: 26.6%
RET: 29.3%
IRET: 0.0%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.
--- tools/perf/builtin-report.c | 70 +++++++++++++++++++++++++++++++++++++++++++++ tools/perf/util/event.h | 3 +- tools/perf/util/hist.c | 5 +--- tools/perf/util/util.c | 59 ++++++++++++++++++++++++++++++++++++++ tools/perf/util/util.h | 17 +++++++++++ 5 files changed, 149 insertions(+), 5 deletions(-)
tools/perf/builtin-report.c +70 -0
@@ -66,6 +66,7 @@ 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 +145,24 @@ 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; + +if (sort__mode ==SORT_MODE__BRANCH ) { + 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 +201,8 @@ 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 +390,50 @@ 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 +469,9 @@ 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 +1004,8 @@ 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/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 {
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 ; }
tools/perf/util/util.c +59 -0
62 lines not on this page · raw message
tools/perf/util/util.h +17 -0
@@ -79,6 +79,7 @@#include <linux/bitops.h> #include <termios.h> #include "strlist.h" +#include "../perf.h" extern const char *graph_line;extern const char *graph_dotted_line;
@@ -380,4 +381,20 @@ struct inline_node {struct inline_node *dso__parse_addr_inlines (struct dso *dso,u64 addr);void inline_node__delete (struct inline_node *node); +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 /* GIT_COMPAT_UTIL_H */
Signature · 1 line
2.7.4
PATCH v3 5/5 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/...).
One example:
perf report --branch-history --stdio --no-children
--23.54%--main div.c:42 (CROSS_2M RET cycles:2)
compute_flag div.c:28 (RET cycles:2) compute_flag div.c:27 (CROSS_2M RET cycles:1) rand rand.c:28 (CROSS_4K RET cycles:1)
rand rand.c:28 (CROSS_2M RET cycles:1) __random random.c:298 (CROSS_4K RET cycles:1) __random random.c:297 (JCC backward CROSS_2M cycles:1) __random random.c:295 (JCC forward CROSS_4K cycles:1) __random random.c:295 (JCC backward CROSS_2M cycles:1) __random random.c:295 (JCC forward CROSS_4K cycles:1) __random random.c:295 (CROSS_2M RET cycles:9)
--- tools/perf/util/callchain.c | 195 ++++++++++++++++++++++++++++++-------------- tools/perf/util/callchain.h | 4 +- tools/perf/util/machine.c | 26 ++++-- 3 files changed, 152 insertions(+), 73 deletions(-)
tools/perf/util/callchain.c +132 -63
@@ -467,6 +467,11 @@ 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 +584,11 @@ 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 +823,7 @@ 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 +863,7 @@ 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 +887,7 @@ 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;
@@ -1105,95 +1116,151 @@ int callchain_branch_counts(struct callchain_root *root, cycles_count); } +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 ; + + printed +=scnprintf (bf + printed, bfsize - printed," (" ); + +if (stat->jcc_fwd >0 ) { + j++; + printed +=scnprintf (bf + printed, bfsize - printed, +"JCC forward" ); + } + +if (stat->jcc_bwd >0 ) { +if (j++) + printed +=scnprintf (bf + printed, bfsize - printed, +" JCC backward" ); +else + printed +=scnprintf (bf + printed, bfsize - printed, +"JCC backward" ); + } + +if (stat->cross_4k >0 ) { +if (j++) + printed +=scnprintf (bf + printed, bfsize - printed, +" CROSS_4K" ); +else + printed +=scnprintf (bf + printed, bfsize - printed, +"CROSS_4K" ); + } + +if (stat->cross_2m >0 ) { +if (j++) + printed +=scnprintf (bf + printed, bfsize - printed, +" CROSS_2M" ); +else + printed +=scnprintf (bf + printed, bfsize - printed, +"CROSS_2M" ); + } + +for (i =0 ; i <PERF_BR_MAX ; i++) { +if (i ==PERF_BR_JCC ) +continue ; + +if (stat->counts[i] >0 ) { +if (j++) + printed +=scnprintf (bf + printed, + bfsize - printed, +" %s" , +branch_type_name (i)); +else + printed +=scnprintf (bf + printed, + bfsize - printed, +"%s" , +branch_type_name (i)); + } + } + +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) { -double predicted_percent =0.0 ; -const char *null_str ="" ; -char iter_str[32 ]; -char cycle_str[32 ]; -char *istr, *cstr;u64 cycles; +int printed, i =0 ;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) { +if (i++) + printed +=scnprintf (bf + printed, bfsize - printed, +" cycles:%" PRId64"" , cycles); +else + printed +=scnprintf (bf + printed, bfsize - printed, +" (cycles:%" PRId64"" , cycles); + }if (iter_count && samples_count) { -if (cycles >0 ) -scnprintf (iter_str,sizeof (iter_str), -" iterations:%" PRId64"" , - iter_count / samples_count); +if (i++) + printed +=scnprintf (bf + printed, bfsize - printed, +" 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; - - predicted_percent = predicted_count *100.0 / branch_count; + printed +=scnprintf (bf + printed, bfsize - printed, +" (iterations:%" PRId64"" , + iter_count / samples_count); + } -if ((predicted_count == branch_count) && (abort_count ==0 )) { -if ((cycles >0 ) || (istr != (char *)null_str)) -return scnprintf (bf, bfsize," (%s%s)" , cstr, istr); +if (predicted_count < branch_count) { +if (i++) + printed +=scnprintf (bf + printed, bfsize - printed, +" predicted:%.1f%%" , + predicted_count *100.0 / branch_count);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); - } + printed +=scnprintf (bf + printed, bfsize - printed, +" (predicted:%.1f%%" , + predicted_count *100.0 / branch_count); } -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); +if (abort_count) { +if (i++) + printed +=scnprintf (bf + printed, bfsize - printed, +" abort:%.1f%%" , + abort_count *100.0 / branch_count);else -return scnprintf (bf, bfsize, -" (abort:%" PRId64")" , - abort_count); + printed +=scnprintf (bf + printed, bfsize - printed, +" (abort:%.1f%%" , + abort_count *100.0 / branch_count); } -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,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);
@@ -1225,7 +1292,8 @@ 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)
@@ -1350,7 +1418,8 @@ 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 +3 -1
@@ -119,6 +119,7 @@ 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 +136,7 @@ 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 +200,7 @@ 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