From 5c1481943250ab65fa5130e05ec479c93216e9f7 Mon Sep 17 00:00:00 2001 From: Peter Zijlstra Date: Wed, 25 Mar 2009 12:30:23 +0100 Subject: [PATCH] perf_counter: output objects 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 Cc: Paul Mackerras Cc: Mike Galbraith Cc: Arjan van de Ven Cc: Wu Fengguang Orig-LKML-Reference: <20090325113316.831607932@chello.nl> Signed-off-by: Ingo Molnar --- include/linux/perf_counter.h | 11 ++++++++ kernel/perf_counter.c | 53 ++++++++++++++++++++++++++++-------- 2 files changed, 52 insertions(+), 12 deletions(-) diff --git a/include/linux/perf_counter.h b/include/linux/perf_counter.h index 48212c15b7d6..c256635377d4 100644 --- a/include/linux/perf_counter.h +++ b/include/linux/perf_counter.h @@ -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; diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c index 0422fd9bf627..d76e3112d386 100644 --- a/kernel/perf_counter.c +++ b/kernel/perf_counter.c @@ -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,