[PATCH 2/4] tracing/hist: Call hist functions directly via a switch statement

From: Steven Rostedt
Date: Tue Aug 23 2022 - 17:51:32 EST

From: "Steven Rostedt (Google)" <rostedt@xxxxxxxxxxx>

Due to retpolines, indirect calls are much more expensive than direct
calls. The histograms have a select set of functions it uses for the
histograms, instead of using function pointers to call them, create a
hist_fn_call() function that uses a switch statement to call the histogram
functions directly. This gives a 13% speedup to the histogram logic.

Using the histogram benchmark:

Before:

# event histogram
#
# trigger info: hist:keys=delta:vals=hitcount:sort=delta:size=2048 if delta > 0 [active]
#

{ delta: 129 } hitcount: 2213
{ delta: 130 } hitcount: 285965
{ delta: 131 } hitcount: 1146545
{ delta: 132 } hitcount: 5185432
{ delta: 133 } hitcount: 19896215
{ delta: 134 } hitcount: 53118616
{ delta: 135 } hitcount: 83816709
{ delta: 136 } hitcount: 68329562
{ delta: 137 } hitcount: 41859349
{ delta: 138 } hitcount: 46257797
{ delta: 139 } hitcount: 54400831
{ delta: 140 } hitcount: 72875007
{ delta: 141 } hitcount: 76193272
{ delta: 142 } hitcount: 49504263
{ delta: 143 } hitcount: 38821072
{ delta: 144 } hitcount: 47702679
{ delta: 145 } hitcount: 41357297
{ delta: 146 } hitcount: 22058238
{ delta: 147 } hitcount: 9720002
{ delta: 148 } hitcount: 3193542
{ delta: 149 } hitcount: 927030
{ delta: 150 } hitcount: 850772
{ delta: 151 } hitcount: 1477380
{ delta: 152 } hitcount: 2687977
{ delta: 153 } hitcount: 2865985
{ delta: 154 } hitcount: 1977492
{ delta: 155 } hitcount: 2475607
{ delta: 156 } hitcount: 3403612

After:

# event histogram
#
# trigger info: hist:keys=delta:vals=hitcount:sort=delta:size=2048 if delta > 0 [active]
#

{ delta: 113 } hitcount: 272
{ delta: 114 } hitcount: 840
{ delta: 118 } hitcount: 344
{ delta: 119 } hitcount: 25428
{ delta: 120 } hitcount: 350590
{ delta: 121 } hitcount: 1892484
{ delta: 122 } hitcount: 6205004
{ delta: 123 } hitcount: 11583521
{ delta: 124 } hitcount: 37590979
{ delta: 125 } hitcount: 108308504
{ delta: 126 } hitcount: 131672461
{ delta: 127 } hitcount: 88700598
{ delta: 128 } hitcount: 65939870
{ delta: 129 } hitcount: 45055004
{ delta: 130 } hitcount: 33174464
{ delta: 131 } hitcount: 31813493
{ delta: 132 } hitcount: 29011676
{ delta: 133 } hitcount: 22798782
{ delta: 134 } hitcount: 22072486
{ delta: 135 } hitcount: 17034113
{ delta: 136 } hitcount: 8982490
{ delta: 137 } hitcount: 2865908
{ delta: 138 } hitcount: 980382
{ delta: 139 } hitcount: 1651944
{ delta: 140 } hitcount: 4112073
{ delta: 141 } hitcount: 3963269
{ delta: 142 } hitcount: 1712508
{ delta: 143 } hitcount: 575941
{ delta: 144 } hitcount: 351427
{ delta: 145 } hitcount: 218077
{ delta: 146 } hitcount: 167297
{ delta: 147 } hitcount: 146198
{ delta: 148 } hitcount: 116122
{ delta: 149 } hitcount: 58993
{ delta: 150 } hitcount: 40228

The delta above is in nanoseconds. It brings the fastest time down from
129ns to 113ns, and the peak from 141ns to 126ns.

Signed-off-by: Steven Rostedt (Google) <rostedt@xxxxxxxxxxx>
---
kernel/trace/trace_events_hist.c | 244 +++++++++++++++++++++----------
1 file changed, 168 insertions(+), 76 deletions(-)

diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index fdf784620c28..92fbd72b6408 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -104,6 +104,38 @@ enum field_op_id {
FIELD_OP_MULT,
};

+enum hist_field_fn {
+ HIST_FIELD_FN_NOP,
+ HIST_FIELD_FN_VAR_REF,
+ HIST_FIELD_FN_COUNTER,
+ HIST_FIELD_FN_CONST,
+ HIST_FIELD_FN_LOG2,
+ HIST_FIELD_FN_BUCKET,
+ HIST_FIELD_FN_TIMESTAMP,
+ HIST_FIELD_FN_CPU,
+ HIST_FIELD_FN_STRING,
+ HIST_FIELD_FN_DYNSTRING,
+ HIST_FIELD_FN_RELDYNSTRING,
+ HIST_FIELD_FN_PSTRING,
+ HIST_FIELD_FN_S64,
+ HIST_FIELD_FN_U64,
+ HIST_FIELD_FN_S32,
+ HIST_FIELD_FN_U32,
+ HIST_FIELD_FN_S16,
+ HIST_FIELD_FN_U16,
+ HIST_FIELD_FN_S8,
+ HIST_FIELD_FN_U8,
+ HIST_FIELD_FN_UMINUS,
+ HIST_FIELD_FN_MINUS,
+ HIST_FIELD_FN_PLUS,
+ HIST_FIELD_FN_DIV,
+ HIST_FIELD_FN_MULT,
+ HIST_FIELD_FN_DIV_POWER2,
+ HIST_FIELD_FN_DIV_NOT_POWER2,
+ HIST_FIELD_FN_DIV_MULT_SHIFT,
+ HIST_FIELD_FN_EXECNAME,
+};
+
/*
* A hist_var (histogram variable) contains variable information for
* hist_fields having the HIST_FIELD_FL_VAR or HIST_FIELD_FL_VAR_REF
@@ -123,15 +155,15 @@ struct hist_var {
struct hist_field {
struct ftrace_event_field *field;
unsigned long flags;
- hist_field_fn_t fn;
- unsigned int ref;
- unsigned int size;
- unsigned int offset;
- unsigned int is_signed;
unsigned long buckets;
const char *type;
struct hist_field *operands[HIST_FIELD_OPERANDS_MAX];
struct hist_trigger_data *hist_data;
+ enum hist_field_fn fn_num;
+ unsigned int ref;
+ unsigned int size;
+ unsigned int offset;
+ unsigned int is_signed;

/*
* Variable fields contain variable-specific info in var.
@@ -166,14 +198,11 @@ struct hist_field {
u64 div_multiplier;
};

-static u64 hist_field_none(struct hist_field *field,
- struct tracing_map_elt *elt,
- struct trace_buffer *buffer,
- struct ring_buffer_event *rbe,
- void *event)
-{
- return 0;
-}
+static u64 hist_fn_call(struct hist_field *hist_field,
+ struct tracing_map_elt *elt,
+ struct trace_buffer *buffer,
+ struct ring_buffer_event *rbe,
+ void *event);

static u64 hist_field_const(struct hist_field *field,
struct tracing_map_elt *elt,
@@ -250,7 +279,7 @@ static u64 hist_field_log2(struct hist_field *hist_field,
{
struct hist_field *operand = hist_field->operands[0];

- u64 val = operand->fn(operand, elt, buffer, rbe, event);
+ u64 val = hist_fn_call(operand, elt, buffer, rbe, event);

return (u64) ilog2(roundup_pow_of_two(val));
}
@@ -264,7 +293,7 @@ static u64 hist_field_bucket(struct hist_field *hist_field,
struct hist_field *operand = hist_field->operands[0];
unsigned long buckets = hist_field->buckets;

- u64 val = operand->fn(operand, elt, buffer, rbe, event);
+ u64 val = hist_fn_call(operand, elt, buffer, rbe, event);

if (WARN_ON_ONCE(!buckets))
return val;
@@ -285,8 +314,8 @@ static u64 hist_field_plus(struct hist_field *hist_field,
struct hist_field *operand1 = hist_field->operands[0];
struct hist_field *operand2 = hist_field->operands[1];

- u64 val1 = operand1->fn(operand1, elt, buffer, rbe, event);
- u64 val2 = operand2->fn(operand2, elt, buffer, rbe, event);
+ u64 val1 = hist_fn_call(operand1, elt, buffer, rbe, event);
+ u64 val2 = hist_fn_call(operand2, elt, buffer, rbe, event);

return val1 + val2;
}
@@ -300,8 +329,8 @@ static u64 hist_field_minus(struct hist_field *hist_field,
struct hist_field *operand1 = hist_field->operands[0];
struct hist_field *operand2 = hist_field->operands[1];

- u64 val1 = operand1->fn(operand1, elt, buffer, rbe, event);
- u64 val2 = operand2->fn(operand2, elt, buffer, rbe, event);
+ u64 val1 = hist_fn_call(operand1, elt, buffer, rbe, event);
+ u64 val2 = hist_fn_call(operand2, elt, buffer, rbe, event);

return val1 - val2;
}
@@ -315,8 +344,8 @@ static u64 hist_field_div(struct hist_field *hist_field,
struct hist_field *operand1 = hist_field->operands[0];
struct hist_field *operand2 = hist_field->operands[1];

- u64 val1 = operand1->fn(operand1, elt, buffer, rbe, event);
- u64 val2 = operand2->fn(operand2, elt, buffer, rbe, event);
+ u64 val1 = hist_fn_call(operand1, elt, buffer, rbe, event);
+ u64 val2 = hist_fn_call(operand2, elt, buffer, rbe, event);

/* Return -1 for the undefined case */
if (!val2)
@@ -338,7 +367,7 @@ static u64 div_by_power_of_two(struct hist_field *hist_field,
struct hist_field *operand1 = hist_field->operands[0];
struct hist_field *operand2 = hist_field->operands[1];

- u64 val1 = operand1->fn(operand1, elt, buffer, rbe, event);
+ u64 val1 = hist_fn_call(operand1, elt, buffer, rbe, event);

return val1 >> __ffs64(operand2->constant);
}
@@ -352,7 +381,7 @@ static u64 div_by_not_power_of_two(struct hist_field *hist_field,
struct hist_field *operand1 = hist_field->operands[0];
struct hist_field *operand2 = hist_field->operands[1];

- u64 val1 = operand1->fn(operand1, elt, buffer, rbe, event);
+ u64 val1 = hist_fn_call(operand1, elt, buffer, rbe, event);

return div64_u64(val1, operand2->constant);
}
@@ -366,7 +395,7 @@ static u64 div_by_mult_and_shift(struct hist_field *hist_field,
struct hist_field *operand1 = hist_field->operands[0];
struct hist_field *operand2 = hist_field->operands[1];

- u64 val1 = operand1->fn(operand1, elt, buffer, rbe, event);
+ u64 val1 = hist_fn_call(operand1, elt, buffer, rbe, event);

/*
* If the divisor is a constant, do a multiplication and shift instead.
@@ -400,8 +429,8 @@ static u64 hist_field_mult(struct hist_field *hist_field,
struct hist_field *operand1 = hist_field->operands[0];
struct hist_field *operand2 = hist_field->operands[1];

- u64 val1 = operand1->fn(operand1, elt, buffer, rbe, event);
- u64 val2 = operand2->fn(operand2, elt, buffer, rbe, event);
+ u64 val1 = hist_fn_call(operand1, elt, buffer, rbe, event);
+ u64 val2 = hist_fn_call(operand2, elt, buffer, rbe, event);

return val1 * val2;
}
@@ -414,7 +443,7 @@ static u64 hist_field_unary_minus(struct hist_field *hist_field,
{
struct hist_field *operand = hist_field->operands[0];

- s64 sval = (s64)operand->fn(operand, elt, buffer, rbe, event);
+ s64 sval = (s64)hist_fn_call(operand, elt, buffer, rbe, event);
u64 val = (u64)-sval;

return val;
@@ -657,19 +686,19 @@ struct snapshot_context {
* Returns the specific division function to use if the divisor
* is constant. This avoids extra branches when the trigger is hit.
*/
-static hist_field_fn_t hist_field_get_div_fn(struct hist_field *divisor)
+static enum hist_field_fn hist_field_get_div_fn(struct hist_field *divisor)
{
u64 div = divisor->constant;

if (!(div & (div - 1)))
- return div_by_power_of_two;
+ return HIST_FIELD_FN_DIV_POWER2;

/* If the divisor is too large, do a regular division */
if (div > (1 << HIST_DIV_SHIFT))
- return div_by_not_power_of_two;
+ return HIST_FIELD_FN_DIV_NOT_POWER2;

divisor->div_multiplier = div64_u64((u64)(1 << HIST_DIV_SHIFT), div);
- return div_by_mult_and_shift;
+ return HIST_FIELD_FN_DIV_MULT_SHIFT;
}

static void track_data_free(struct track_data *track_data)
@@ -1334,38 +1363,32 @@ static const char *hist_field_name(struct hist_field *field,
return field_name;
}

-static hist_field_fn_t select_value_fn(int field_size, int field_is_signed)
+static enum hist_field_fn select_value_fn(int field_size, int field_is_signed)
{
- hist_field_fn_t fn = NULL;
-
switch (field_size) {
case 8:
if (field_is_signed)
- fn = hist_field_s64;
+ return HIST_FIELD_FN_S64;
else
- fn = hist_field_u64;
- break;
+ return HIST_FIELD_FN_U64;
case 4:
if (field_is_signed)
- fn = hist_field_s32;
+ return HIST_FIELD_FN_S32;
else
- fn = hist_field_u32;
- break;
+ return HIST_FIELD_FN_U32;
case 2:
if (field_is_signed)
- fn = hist_field_s16;
+ return HIST_FIELD_FN_S16;
else
- fn = hist_field_u16;
- break;
+ return HIST_FIELD_FN_U16;
case 1:
if (field_is_signed)
- fn = hist_field_s8;
+ return HIST_FIELD_FN_S8;
else
- fn = hist_field_u8;
- break;
+ return HIST_FIELD_FN_U8;
}

- return fn;
+ return HIST_FIELD_FN_NOP;
}

static int parse_map_size(char *str)
@@ -1922,19 +1945,19 @@ static struct hist_field *create_hist_field(struct hist_trigger_data *hist_data,
goto out; /* caller will populate */

if (flags & HIST_FIELD_FL_VAR_REF) {
- hist_field->fn = hist_field_var_ref;
+ hist_field->fn_num = HIST_FIELD_FN_VAR_REF;
goto out;
}

if (flags & HIST_FIELD_FL_HITCOUNT) {
- hist_field->fn = hist_field_counter;
+ hist_field->fn_num = HIST_FIELD_FN_COUNTER;
hist_field->size = sizeof(u64);
hist_field->type = "u64";
goto out;
}

if (flags & HIST_FIELD_FL_CONST) {
- hist_field->fn = hist_field_const;
+ hist_field->fn_num = HIST_FIELD_FN_CONST;
hist_field->size = sizeof(u64);
hist_field->type = kstrdup("u64", GFP_KERNEL);
if (!hist_field->type)
@@ -1943,14 +1966,14 @@ static struct hist_field *create_hist_field(struct hist_trigger_data *hist_data,
}

if (flags & HIST_FIELD_FL_STACKTRACE) {
- hist_field->fn = hist_field_none;
+ hist_field->fn_num = HIST_FIELD_FN_NOP;
goto out;
}

if (flags & (HIST_FIELD_FL_LOG2 | HIST_FIELD_FL_BUCKET)) {
unsigned long fl = flags & ~(HIST_FIELD_FL_LOG2 | HIST_FIELD_FL_BUCKET);
- hist_field->fn = flags & HIST_FIELD_FL_LOG2 ? hist_field_log2 :
- hist_field_bucket;
+ hist_field->fn_num = flags & HIST_FIELD_FL_LOG2 ? HIST_FIELD_FN_LOG2 :
+ HIST_FIELD_FN_BUCKET;
hist_field->operands[0] = create_hist_field(hist_data, field, fl, NULL);
hist_field->size = hist_field->operands[0]->size;
hist_field->type = kstrdup_const(hist_field->operands[0]->type, GFP_KERNEL);
@@ -1960,14 +1983,14 @@ static struct hist_field *create_hist_field(struct hist_trigger_data *hist_data,
}

if (flags & HIST_FIELD_FL_TIMESTAMP) {
- hist_field->fn = hist_field_timestamp;
+ hist_field->fn_num = HIST_FIELD_FN_TIMESTAMP;
hist_field->size = sizeof(u64);
hist_field->type = "u64";
goto out;
}

if (flags & HIST_FIELD_FL_CPU) {
- hist_field->fn = hist_field_cpu;
+ hist_field->fn_num = HIST_FIELD_FN_CPU;
hist_field->size = sizeof(int);
hist_field->type = "unsigned int";
goto out;
@@ -1987,14 +2010,14 @@ static struct hist_field *create_hist_field(struct hist_trigger_data *hist_data,
goto free;

if (field->filter_type == FILTER_STATIC_STRING) {
- hist_field->fn = hist_field_string;
+ hist_field->fn_num = HIST_FIELD_FN_STRING;
hist_field->size = field->size;
} else if (field->filter_type == FILTER_DYN_STRING) {
- hist_field->fn = hist_field_dynstring;
+ hist_field->fn_num = HIST_FIELD_FN_DYNSTRING;
} else if (field->filter_type == FILTER_RDYN_STRING)
- hist_field->fn = hist_field_reldynstring;
+ hist_field->fn_num = HIST_FIELD_FN_RELDYNSTRING;
else
- hist_field->fn = hist_field_pstring;
+ hist_field->fn_num = HIST_FIELD_FN_PSTRING;
} else {
hist_field->size = field->size;
hist_field->is_signed = field->is_signed;
@@ -2002,9 +2025,9 @@ static struct hist_field *create_hist_field(struct hist_trigger_data *hist_data,
if (!hist_field->type)
goto free;

- hist_field->fn = select_value_fn(field->size,
- field->is_signed);
- if (!hist_field->fn) {
+ hist_field->fn_num = select_value_fn(field->size,
+ field->is_signed);
+ if (hist_field->fn_num == HIST_FIELD_FN_NOP) {
destroy_hist_field(hist_field, 0);
return NULL;
}
@@ -2340,7 +2363,7 @@ static struct hist_field *create_alias(struct hist_trigger_data *hist_data,
if (!alias)
return NULL;

- alias->fn = var_ref->fn;
+ alias->fn_num = var_ref->fn_num;
alias->operands[0] = var_ref;

if (init_var_ref(alias, var_ref, var_ref->system, var_ref->event_name)) {
@@ -2523,7 +2546,7 @@ static struct hist_field *parse_unary(struct hist_trigger_data *hist_data,

expr->flags |= operand1->flags &
(HIST_FIELD_FL_TIMESTAMP | HIST_FIELD_FL_TIMESTAMP_USECS);
- expr->fn = hist_field_unary_minus;
+ expr->fn_num = HIST_FIELD_FN_UMINUS;
expr->operands[0] = operand1;
expr->size = operand1->size;
expr->is_signed = operand1->is_signed;
@@ -2595,7 +2618,7 @@ static struct hist_field *parse_expr(struct hist_trigger_data *hist_data,
unsigned long operand_flags, operand2_flags;
int field_op, ret = -EINVAL;
char *sep, *operand1_str;
- hist_field_fn_t op_fn;
+ enum hist_field_fn op_fn;
bool combine_consts;

if (*n_subexprs > 3) {
@@ -2654,16 +2677,16 @@ static struct hist_field *parse_expr(struct hist_trigger_data *hist_data,

switch (field_op) {
case FIELD_OP_MINUS:
- op_fn = hist_field_minus;
+ op_fn = HIST_FIELD_FN_MINUS;
break;
case FIELD_OP_PLUS:
- op_fn = hist_field_plus;
+ op_fn = HIST_FIELD_FN_PLUS;
break;
case FIELD_OP_DIV:
- op_fn = hist_field_div;
+ op_fn = HIST_FIELD_FN_DIV;
break;
case FIELD_OP_MULT:
- op_fn = hist_field_mult;
+ op_fn = HIST_FIELD_FN_MULT;
break;
default:
ret = -EINVAL;
@@ -2725,7 +2748,8 @@ static struct hist_field *parse_expr(struct hist_trigger_data *hist_data,
if (var2)
expr->operands[1] = var2;

- expr->constant = op_fn(expr, NULL, NULL, NULL, NULL);
+ expr->fn_num = op_fn;
+ expr->constant = hist_fn_call(expr, NULL, NULL, NULL, NULL);

expr->operands[0] = NULL;
expr->operands[1] = NULL;
@@ -2739,7 +2763,7 @@ static struct hist_field *parse_expr(struct hist_trigger_data *hist_data,

expr->name = expr_str(expr, 0);
} else {
- expr->fn = op_fn;
+ expr->fn_num = op_fn;

/* The operand sizes should be the same, so just pick one */
expr->size = operand1->size;
@@ -3065,7 +3089,7 @@ static inline void __update_field_vars(struct tracing_map_elt *elt,
struct hist_field *var = field_var->var;
struct hist_field *val = field_var->val;

- var_val = val->fn(val, elt, buffer, rbe, rec);
+ var_val = hist_fn_call(val, elt, buffer, rbe, rec);
var_idx = var->var.idx;

if (val->flags & HIST_FIELD_FL_STRING) {
@@ -4186,6 +4210,74 @@ static u64 hist_field_execname(struct hist_field *hist_field,
return (u64)(unsigned long)(elt_data->comm);
}

+static u64 hist_fn_call(struct hist_field *hist_field,
+ struct tracing_map_elt *elt,
+ struct trace_buffer *buffer,
+ struct ring_buffer_event *rbe,
+ void *event)
+{
+ switch (hist_field->fn_num) {
+ case HIST_FIELD_FN_VAR_REF:
+ return hist_field_var_ref(hist_field, elt, buffer, rbe, event);
+ case HIST_FIELD_FN_COUNTER:
+ return hist_field_counter(hist_field, elt, buffer, rbe, event);
+ case HIST_FIELD_FN_CONST:
+ return hist_field_const(hist_field, elt, buffer, rbe, event);
+ case HIST_FIELD_FN_LOG2:
+ return hist_field_log2(hist_field, elt, buffer, rbe, event);
+ case HIST_FIELD_FN_BUCKET:
+ return hist_field_bucket(hist_field, elt, buffer, rbe, event);
+ case HIST_FIELD_FN_TIMESTAMP:
+ return hist_field_timestamp(hist_field, elt, buffer, rbe, event);
+ case HIST_FIELD_FN_CPU:
+ return hist_field_cpu(hist_field, elt, buffer, rbe, event);
+ case HIST_FIELD_FN_STRING:
+ return hist_field_string(hist_field, elt, buffer, rbe, event);
+ case HIST_FIELD_FN_DYNSTRING:
+ return hist_field_dynstring(hist_field, elt, buffer, rbe, event);
+ case HIST_FIELD_FN_RELDYNSTRING:
+ return hist_field_reldynstring(hist_field, elt, buffer, rbe, event);
+ case HIST_FIELD_FN_PSTRING:
+ return hist_field_pstring(hist_field, elt, buffer, rbe, event);
+ case HIST_FIELD_FN_S64:
+ return hist_field_s64(hist_field, elt, buffer, rbe, event);
+ case HIST_FIELD_FN_U64:
+ return hist_field_u64(hist_field, elt, buffer, rbe, event);
+ case HIST_FIELD_FN_S32:
+ return hist_field_s32(hist_field, elt, buffer, rbe, event);
+ case HIST_FIELD_FN_U32:
+ return hist_field_u32(hist_field, elt, buffer, rbe, event);
+ case HIST_FIELD_FN_S16:
+ return hist_field_s16(hist_field, elt, buffer, rbe, event);
+ case HIST_FIELD_FN_U16:
+ return hist_field_u16(hist_field, elt, buffer, rbe, event);
+ case HIST_FIELD_FN_S8:
+ return hist_field_s8(hist_field, elt, buffer, rbe, event);
+ case HIST_FIELD_FN_U8:
+ return hist_field_u8(hist_field, elt, buffer, rbe, event);
+ case HIST_FIELD_FN_UMINUS:
+ return hist_field_unary_minus(hist_field, elt, buffer, rbe, event);
+ case HIST_FIELD_FN_MINUS:
+ return hist_field_minus(hist_field, elt, buffer, rbe, event);
+ case HIST_FIELD_FN_PLUS:
+ return hist_field_plus(hist_field, elt, buffer, rbe, event);
+ case HIST_FIELD_FN_DIV:
+ return hist_field_div(hist_field, elt, buffer, rbe, event);
+ case HIST_FIELD_FN_MULT:
+ return hist_field_mult(hist_field, elt, buffer, rbe, event);
+ case HIST_FIELD_FN_DIV_POWER2:
+ return div_by_power_of_two(hist_field, elt, buffer, rbe, event);
+ case HIST_FIELD_FN_DIV_NOT_POWER2:
+ return div_by_not_power_of_two(hist_field, elt, buffer, rbe, event);
+ case HIST_FIELD_FN_DIV_MULT_SHIFT:
+ return div_by_mult_and_shift(hist_field, elt, buffer, rbe, event);
+ case HIST_FIELD_FN_EXECNAME:
+ return hist_field_execname(hist_field, elt, buffer, rbe, event);
+ default:
+ return 0;
+ }
+}
+
/* Convert a var that points to common_pid.execname to a string */
static void update_var_execname(struct hist_field *hist_field)
{
@@ -4197,7 +4289,7 @@ static void update_var_execname(struct hist_field *hist_field)
kfree_const(hist_field->type);
hist_field->type = "char[]";

- hist_field->fn = hist_field_execname;
+ hist_field->fn_num = HIST_FIELD_FN_EXECNAME;
}

static int create_var_field(struct hist_trigger_data *hist_data,
@@ -4956,7 +5048,7 @@ static void hist_trigger_elt_update(struct hist_trigger_data *hist_data,

for_each_hist_val_field(i, hist_data) {
hist_field = hist_data->fields[i];
- hist_val = hist_field->fn(hist_field, elt, buffer, rbe, rec);
+ hist_val = hist_fn_call(hist_field, elt, buffer, rbe, rec);
if (hist_field->flags & HIST_FIELD_FL_VAR) {
var_idx = hist_field->var.idx;

@@ -4987,7 +5079,7 @@ static void hist_trigger_elt_update(struct hist_trigger_data *hist_data,
for_each_hist_key_field(i, hist_data) {
hist_field = hist_data->fields[i];
if (hist_field->flags & HIST_FIELD_FL_VAR) {
- hist_val = hist_field->fn(hist_field, elt, buffer, rbe, rec);
+ hist_val = hist_fn_call(hist_field, elt, buffer, rbe, rec);
var_idx = hist_field->var.idx;
tracing_map_set_var(elt, var_idx, hist_val);
}
@@ -5062,7 +5154,7 @@ static void event_hist_trigger(struct event_trigger_data *data,
HIST_STACKTRACE_SKIP);
key = entries;
} else {
- field_contents = key_field->fn(key_field, elt, buffer, rbe, rec);
+ field_contents = hist_fn_call(key_field, elt, buffer, rbe, rec);
if (key_field->flags & HIST_FIELD_FL_STRING) {
key = (void *)(unsigned long)field_contents;
use_compound_key = true;
--
2.35.1