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perf_counter: output objects

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Provide a {type,size} header for each output entry.

This should provide extensible output, and the ability to mix multiple streams.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Arjan van de Ven <arjan@infradead.org>
Cc: Wu Fengguang <fengguang.wu@intel.com>
Orig-LKML-Reference: <20090325113316.831607932@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2009-03-25 12:30:23 +01:00 committed by Ingo Molnar
parent b9cacc7bf1
commit 5c14819432
2 changed files with 52 additions and 12 deletions
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11
include/linux/perf_counter.h
View file

@ -156,6 +156,16 @@ struct perf_counter_mmap_page {
__u32 data_head; /* head in the data section */
};
struct perf_event_header {
__u32 type;
__u32 size;
};
enum perf_event_type {
PERF_EVENT_IP = 0,
PERF_EVENT_GROUP = 1,
};
#ifdef __KERNEL__
/*
* Kernel-internal data types and definitions:
@ -260,6 +270,7 @@ struct perf_counter {
struct list_head list_entry;
struct list_head event_entry;
struct list_head sibling_list;
int nr_siblings;
struct perf_counter *group_leader;
const struct hw_perf_counter_ops *hw_ops;

53
kernel/perf_counter.c
View file

@ -75,8 +75,10 @@ list_add_counter(struct perf_counter *counter, struct perf_counter_context *ctx)
*/
if (counter->group_leader == counter)
list_add_tail(&counter->list_entry, &ctx->counter_list);
else
else {
list_add_tail(&counter->list_entry, &group_leader->sibling_list);
group_leader->nr_siblings++;
}
list_add_rcu(&counter->event_entry, &ctx->event_list);
}
@ -89,6 +91,9 @@ list_del_counter(struct perf_counter *counter, struct perf_counter_context *ctx)
list_del_init(&counter->list_entry);
list_del_rcu(&counter->event_entry);
if (counter->group_leader != counter)
counter->group_leader->nr_siblings--;
/*
* If this was a group counter with sibling counters then
* upgrade the siblings to singleton counters by adding them
@ -381,9 +386,11 @@ static int is_software_only_group(struct perf_counter *leader)
if (!is_software_counter(leader))
return 0;
list_for_each_entry(counter, &leader->sibling_list, list_entry)
if (!is_software_counter(counter))
return 0;
return 1;
}
@ -1480,6 +1487,9 @@ static void perf_output_copy(struct perf_output_handle *handle,
handle->offset = offset;
}
#define perf_output_put(handle, x) \
perf_output_copy((handle), &(x), sizeof(x))
static void perf_output_end(struct perf_output_handle *handle, int nmi)
{
if (handle->wakeup) {
@ -1514,34 +1524,53 @@ out:
static void perf_output_simple(struct perf_counter *counter,
int nmi, struct pt_regs *regs)
{
u64 entry;
struct {
struct perf_event_header header;
u64 ip;
} event;
entry = instruction_pointer(regs);
event.header.type = PERF_EVENT_IP;
event.header.size = sizeof(event);
event.ip = instruction_pointer(regs);
perf_output_write(counter, nmi, &entry, sizeof(entry));
perf_output_write(counter, nmi, &event, sizeof(event));
}
struct group_entry {
u64 event;
u64 counter;
};
static void perf_output_group(struct perf_counter *counter, int nmi)
{
struct perf_output_handle handle;
struct perf_event_header header;
struct perf_counter *leader, *sub;
unsigned int size;
struct {
u64 event;
u64 counter;
} entry;
int ret;
size = sizeof(header) + counter->nr_siblings * sizeof(entry);
ret = perf_output_begin(&handle, counter, size);
if (ret)
return;
header.type = PERF_EVENT_GROUP;
header.size = size;
perf_output_put(&handle, header);
leader = counter->group_leader;
list_for_each_entry(sub, &leader->sibling_list, list_entry) {
struct group_entry entry;
if (sub != counter)
sub->hw_ops->read(sub);
entry.event = sub->hw_event.config;
entry.counter = atomic64_read(&sub->count);
perf_output_write(counter, nmi, &entry, sizeof(entry));
perf_output_put(&handle, entry);
}
perf_output_end(&handle, nmi);
}
void perf_counter_output(struct perf_counter *counter,