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perf report: Show branch type

PATCH Superseded Jin Yao 2 participants 15 messages Apr 19, 2017 – Apr 20, 2017

Subsystems (2)

v5 of 10 Superseded Latest is v10 →

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Jin Yao

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#0 lore raw

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
author
#1 lore raw

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 : unknown
PERF_BR_JCC : conditional jump
PERF_BR_JMP : jump
PERF_BR_IND_JMP : indirect jump
PERF_BR_CALL : call
PERF_BR_IND_CALL : indirect call
PERF_BR_RET : return
PERF_BR_SYSCALL : syscall
PERF_BR_SYSRET : syscall return
PERF_BR_IRQ : hw interrupt/trap/fault
PERF_BR_INT : sw interrupt
PERF_BR_IRET : return from interrupt
PERF_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
index d09a9cd..69af012 100644
@@ -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
index d09a9cd..69af012 100644
@@ -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
author
#2 lore raw

PATCH v5 2/7 perf/x86/intel: Record branch type

In reply to 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 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
index f924629..f10a7ed 100644
@@ -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
author
#3 lore raw

PATCH v5 3/7 perf record: Create a new option save_type in --branch-filter

In reply to Jin Yao

The 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
index ea3789d..e2f5a4f 100644
@@ -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
index 38fd115..e71fb5f 100644
@@ -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
author
#4 lore raw

PATCH v5 4/7 perf report: Refactor the branch info printing code

In reply to Jin Yao

The 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
index 2e5eff5..8cae8a6 100644
@@ -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
#5 lore raw

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

#6 lore raw

Re: [PATCH v5 4/7] perf report: Refactor the branch info printing code

In reply to Jin Yao

On 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 -18
 			     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;
-

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

author
#7 lore raw

PATCH v5 5/7 perf util: Create branch.c/.h for common branch functions

In reply to Jin Yao

Create 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
index 5c0ea11..40e318c 100644
@@ -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
new file mode 100644
index 0000000..26c8da6
@@ -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
index eb7a7b2..26b4c2e 100644
@@ -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
author
#8 lore raw

PATCH v5 6/7 perf report: Show branch type statistics for stdio mode

In reply to Jin Yao

Show 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
index c18158b..0050b13 100644
@@ -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 report
 	return 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
index 61bf304..c8aee25 100644
@@ -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
#9 lore raw

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

#10 lore raw

Re: [PATCH v5 6/7] perf report: Show branch type statistics for stdio mode

In reply to Jin Yao

On 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

author
#11 lore raw

PATCH v5 7/7 perf report: Show branch type in callchain entry

In reply to Jin Yao

Show 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
index 8cae8a6..0cf17ae 100644
@@ -22,6 +22,7 @@
 #include "sort.h"
 #include "machine.h"
 #include "callchain.h"
+#include "branch.h"
 
 __thread struct 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
index c56c23d..9773820 100644
@@ -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
index dfc6004..2309614 100644
@@ -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
#12 lore raw

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

author
#13 lore raw

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

#14 lore raw

Re: [PATCH v5 7/7] perf report: Show branch type in callchain entry

In reply to Jin Yao

On 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