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perf_counter: Rework the sample ABI 

The PERF_EVENT_READ implementation made me realize we don't
actually need the sample_type int the output sample, since
we already have that in the perf_counter_attr information.

Therefore, remove the PERF_EVENT_MISC_OVERFLOW bit and the
event->type overloading, and imply put counter overflow
samples in a PERF_EVENT_SAMPLE type.

This also fixes the issue that event->type was only 32-bit
and sample_type had 64 usable bits.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2009-06-25 11:27:12 +02:00 committed by Ingo Molnar
parent bfbd3381e6
commit e6e18ec79b
5 changed files with 49 additions and 48 deletions
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10
include/linux/perf_counter.h
View File

@ -262,7 +262,6 @@ struct perf_counter_mmap_page {
#define PERF_EVENT_MISC_KERNEL (1 << 0)
#define PERF_EVENT_MISC_USER (2 << 0)
#define PERF_EVENT_MISC_HYPERVISOR (3 << 0)
#define PERF_EVENT_MISC_OVERFLOW (1 << 2)
struct perf_event_header {
__u32 type;
@ -348,9 +347,6 @@ enum perf_event_type {
PERF_EVENT_READ = 8,
/*
* When header.misc & PERF_EVENT_MISC_OVERFLOW the event_type field
* will be PERF_SAMPLE_*
*
* struct {
* struct perf_event_header header;
*
@ -358,8 +354,9 @@ enum perf_event_type {
* { u32 pid, tid; } && PERF_SAMPLE_TID
* { u64 time; } && PERF_SAMPLE_TIME
* { u64 addr; } && PERF_SAMPLE_ADDR
* { u64 config; } && PERF_SAMPLE_CONFIG
* { u64 id; } && PERF_SAMPLE_ID
* { u32 cpu, res; } && PERF_SAMPLE_CPU
* { u64 period; } && PERF_SAMPLE_PERIOD
*
* { u64 nr;
* { u64 id, val; } cnt[nr]; } && PERF_SAMPLE_GROUP
@ -368,6 +365,9 @@ enum perf_event_type {
* u64 ips[nr]; } && PERF_SAMPLE_CALLCHAIN
* };
*/
PERF_EVENT_SAMPLE = 9,
PERF_EVENT_MAX, /* non-ABI */
};
enum perf_callchain_context {

36
kernel/perf_counter.c
View File

@ -2575,15 +2575,14 @@ static void perf_counter_output(struct perf_counter *counter, int nmi,
u32 cpu, reserved;
} cpu_entry;
header.type = 0;
header.type = PERF_EVENT_SAMPLE;
header.size = sizeof(header);
header.misc = PERF_EVENT_MISC_OVERFLOW;
header.misc = 0;
header.misc |= perf_misc_flags(data->regs);
if (sample_type & PERF_SAMPLE_IP) {
ip = perf_instruction_pointer(data->regs);
header.type |= PERF_SAMPLE_IP;
header.size += sizeof(ip);
}
@ -2592,7 +2591,6 @@ static void perf_counter_output(struct perf_counter *counter, int nmi,
tid_entry.pid = perf_counter_pid(counter, current);
tid_entry.tid = perf_counter_tid(counter, current);
header.type |= PERF_SAMPLE_TID;
header.size += sizeof(tid_entry);
}
@ -2602,34 +2600,25 @@ static void perf_counter_output(struct perf_counter *counter, int nmi,
*/
time = sched_clock();
header.type |= PERF_SAMPLE_TIME;
header.size += sizeof(u64);
}
if (sample_type & PERF_SAMPLE_ADDR) {
header.type |= PERF_SAMPLE_ADDR;
if (sample_type & PERF_SAMPLE_ADDR)
header.size += sizeof(u64);
}
if (sample_type & PERF_SAMPLE_ID) {
header.type |= PERF_SAMPLE_ID;
if (sample_type & PERF_SAMPLE_ID)
header.size += sizeof(u64);
}
if (sample_type & PERF_SAMPLE_CPU) {
header.type |= PERF_SAMPLE_CPU;
header.size += sizeof(cpu_entry);
cpu_entry.cpu = raw_smp_processor_id();
}
if (sample_type & PERF_SAMPLE_PERIOD) {
header.type |= PERF_SAMPLE_PERIOD;
if (sample_type & PERF_SAMPLE_PERIOD)
header.size += sizeof(u64);
}
if (sample_type & PERF_SAMPLE_GROUP) {
header.type |= PERF_SAMPLE_GROUP;
header.size += sizeof(u64) +
counter->nr_siblings * sizeof(group_entry);
}
@ -2639,10 +2628,9 @@ static void perf_counter_output(struct perf_counter *counter, int nmi,
if (callchain) {
callchain_size = (1 + callchain->nr) * sizeof(u64);
header.type |= PERF_SAMPLE_CALLCHAIN;
header.size += callchain_size;
}
} else
header.size += sizeof(u64);
}
ret = perf_output_begin(&handle, counter, header.size, nmi, 1);
@ -2693,8 +2681,14 @@ static void perf_counter_output(struct perf_counter *counter, int nmi,
}
}
if (callchain)
perf_output_copy(&handle, callchain, callchain_size);
if (sample_type & PERF_SAMPLE_CALLCHAIN) {
if (callchain)
perf_output_copy(&handle, callchain, callchain_size);
else {
u64 nr = 0;
perf_output_put(&handle, nr);
}
}
perf_output_end(&handle);
}

8
tools/perf/builtin-annotate.c
View File

@ -855,7 +855,7 @@ static unsigned long total = 0,
total_unknown = 0;
static int
process_overflow_event(event_t *event, unsigned long offset, unsigned long head)
process_sample_event(event_t *event, unsigned long offset, unsigned long head)
{
char level;
int show = 0;
@ -1013,10 +1013,10 @@ process_period_event(event_t *event, unsigned long offset, unsigned long head)
static int
process_event(event_t *event, unsigned long offset, unsigned long head)
{
if (event->header.misc & PERF_EVENT_MISC_OVERFLOW)
return process_overflow_event(event, offset, head);
switch (event->header.type) {
case PERF_EVENT_SAMPLE:
return process_sample_event(event, offset, head);
case PERF_EVENT_MMAP:
return process_mmap_event(event, offset, head);

32
tools/perf/builtin-report.c
View File

@ -53,6 +53,8 @@ static regex_t parent_regex;
static int exclude_other = 1;
static u64 sample_type;
struct ip_event {
struct perf_event_header header;
u64 ip;
@ -1135,7 +1137,7 @@ static int validate_chain(struct ip_callchain *chain, event_t *event)
}
static int
process_overflow_event(event_t *event, unsigned long offset, unsigned long head)
process_sample_event(event_t *event, unsigned long offset, unsigned long head)
{
char level;
int show = 0;
@ -1147,12 +1149,12 @@ process_overflow_event(event_t *event, unsigned long offset, unsigned long head)
void *more_data = event->ip.__more_data;
struct ip_callchain *chain = NULL;
if (event->header.type & PERF_SAMPLE_PERIOD) {
if (sample_type & PERF_SAMPLE_PERIOD) {
period = *(u64 *)more_data;
more_data += sizeof(u64);
}
dprintf("%p [%p]: PERF_EVENT (IP, %d): %d: %p period: %Ld\n",
dprintf("%p [%p]: PERF_EVENT_SAMPLE (IP, %d): %d: %p period: %Ld\n",
(void *)(offset + head),
(void *)(long)(event->header.size),
event->header.misc,
@ -1160,7 +1162,7 @@ process_overflow_event(event_t *event, unsigned long offset, unsigned long head)
(void *)(long)ip,
(long long)period);
if (event->header.type & PERF_SAMPLE_CALLCHAIN) {
if (sample_type & PERF_SAMPLE_CALLCHAIN) {
int i;
chain = (void *)more_data;
@ -1352,10 +1354,10 @@ process_event(event_t *event, unsigned long offset, unsigned long head)
{
trace_event(event);
if (event->header.misc & PERF_EVENT_MISC_OVERFLOW)
return process_overflow_event(event, offset, head);
switch (event->header.type) {
case PERF_EVENT_SAMPLE:
return process_sample_event(event, offset, head);
case PERF_EVENT_MMAP:
return process_mmap_event(event, offset, head);
@ -1388,18 +1390,21 @@ process_event(event_t *event, unsigned long offset, unsigned long head)
static struct perf_header *header;
static int perf_header__has_sample(u64 sample_mask)
static u64 perf_header__sample_type(void)
{
u64 sample_type = 0;
int i;
for (i = 0; i < header->attrs; i++) {
struct perf_header_attr *attr = header->attr[i];
if (!(attr->attr.sample_type & sample_mask))
return 0;
if (!sample_type)
sample_type = attr->attr.sample_type;
else if (sample_type != attr->attr.sample_type)
die("non matching sample_type");
}
return 1;
return sample_type;
}
static int __cmd_report(void)
@ -1437,8 +1442,9 @@ static int __cmd_report(void)
header = perf_header__read(input);
head = header->data_offset;
if (sort__has_parent &&
!perf_header__has_sample(PERF_SAMPLE_CALLCHAIN)) {
sample_type = perf_header__sample_type();
if (sort__has_parent && !(sample_type & PERF_SAMPLE_CALLCHAIN)) {
fprintf(stderr, "selected --sort parent, but no callchain data\n");
exit(-1);
}

11
tools/perf/builtin-top.c
View File

@ -392,11 +392,11 @@ static void record_ip(u64 ip, int counter)
samples--;
}
static void process_event(u64 ip, int counter)
static void process_event(u64 ip, int counter, int user)
{
samples++;
if (ip < min_ip || ip > max_ip) {
if (user) {
userspace_samples++;
return;
}
@ -509,9 +509,10 @@ static void mmap_read_counter(struct mmap_data *md)
old += size;
if (event->header.misc & PERF_EVENT_MISC_OVERFLOW) {
if (event->header.type & PERF_SAMPLE_IP)
process_event(event->ip.ip, md->counter);
if (event->header.type == PERF_EVENT_SAMPLE) {
int user =
(event->header.misc & PERF_EVENT_MISC_CPUMODE_MASK) == PERF_EVENT_MISC_USER;
process_event(event->ip.ip, md->counter, user);
}
}