From f939715586ea4f046eb52523ae25eb4d20b2a497 Mon Sep 17 00:00:00 2001 From: Adrian Hunter Date: Thu, 9 Apr 2015 18:53:52 +0300 Subject: [PATCH] perf auxtrace: Add a heap for sorting AUX area tracing queues In order to process AUX area tracing data in time order, the queue with data with the lowest timestamp must be processed first. Provide a heap to keep track of which queue that is. As with the queues, a decoder does not have to use the heap, but Intel BTS and Intel PT will use it. Signed-off-by: Adrian Hunter Cc: David Ahern Cc: Frederic Weisbecker Cc: Jiri Olsa Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Stephane Eranian Link: http://lkml.kernel.org/r/1428594864-29309-13-git-send-email-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/auxtrace.c | 85 ++++++++++++++++++++++++++++++++++++++ tools/perf/util/auxtrace.h | 29 +++++++++++++ 2 files changed, 114 insertions(+) diff --git a/tools/perf/util/auxtrace.c b/tools/perf/util/auxtrace.c index 252417ac28e2..e13b1a14c859 100644 --- a/tools/perf/util/auxtrace.c +++ b/tools/perf/util/auxtrace.c @@ -361,6 +361,91 @@ void auxtrace_queues__free(struct auxtrace_queues *queues) queues->nr_queues = 0; } +static void auxtrace_heapify(struct auxtrace_heap_item *heap_array, + unsigned int pos, unsigned int queue_nr, + u64 ordinal) +{ + unsigned int parent; + + while (pos) { + parent = (pos - 1) >> 1; + if (heap_array[parent].ordinal <= ordinal) + break; + heap_array[pos] = heap_array[parent]; + pos = parent; + } + heap_array[pos].queue_nr = queue_nr; + heap_array[pos].ordinal = ordinal; +} + +int auxtrace_heap__add(struct auxtrace_heap *heap, unsigned int queue_nr, + u64 ordinal) +{ + struct auxtrace_heap_item *heap_array; + + if (queue_nr >= heap->heap_sz) { + unsigned int heap_sz = AUXTRACE_INIT_NR_QUEUES; + + while (heap_sz <= queue_nr) + heap_sz <<= 1; + heap_array = realloc(heap->heap_array, + heap_sz * sizeof(struct auxtrace_heap_item)); + if (!heap_array) + return -ENOMEM; + heap->heap_array = heap_array; + heap->heap_sz = heap_sz; + } + + auxtrace_heapify(heap->heap_array, heap->heap_cnt++, queue_nr, ordinal); + + return 0; +} + +void auxtrace_heap__free(struct auxtrace_heap *heap) +{ + zfree(&heap->heap_array); + heap->heap_cnt = 0; + heap->heap_sz = 0; +} + +void auxtrace_heap__pop(struct auxtrace_heap *heap) +{ + unsigned int pos, last, heap_cnt = heap->heap_cnt; + struct auxtrace_heap_item *heap_array; + + if (!heap_cnt) + return; + + heap->heap_cnt -= 1; + + heap_array = heap->heap_array; + + pos = 0; + while (1) { + unsigned int left, right; + + left = (pos << 1) + 1; + if (left >= heap_cnt) + break; + right = left + 1; + if (right >= heap_cnt) { + heap_array[pos] = heap_array[left]; + return; + } + if (heap_array[left].ordinal < heap_array[right].ordinal) { + heap_array[pos] = heap_array[left]; + pos = left; + } else { + heap_array[pos] = heap_array[right]; + pos = right; + } + } + + last = heap_cnt - 1; + auxtrace_heapify(heap_array, pos, heap_array[last].queue_nr, + heap_array[last].ordinal); +} + size_t auxtrace_record__info_priv_size(struct auxtrace_record *itr) { if (itr) diff --git a/tools/perf/util/auxtrace.h b/tools/perf/util/auxtrace.h index c6b5981384de..c3514f3b7111 100644 --- a/tools/perf/util/auxtrace.h +++ b/tools/perf/util/auxtrace.h @@ -167,6 +167,29 @@ struct auxtrace_queues { u64 next_buffer_nr; }; +/** + * struct auxtrace_heap_item - element of struct auxtrace_heap. + * @queue_nr: queue number + * @ordinal: value used for sorting (lowest ordinal is top of the heap) expected + * to be a timestamp + */ +struct auxtrace_heap_item { + unsigned int queue_nr; + u64 ordinal; +}; + +/** + * struct auxtrace_heap - a heap suitable for sorting AUX area tracing queues. + * @heap_array: the heap + * @heap_cnt: the number of elements in the heap + * @heap_sz: maximum number of elements (grows as needed) + */ +struct auxtrace_heap { + struct auxtrace_heap_item *heap_array; + unsigned int heap_cnt; + unsigned int heap_sz; +}; + /** * struct auxtrace_mmap - records an mmap of the auxtrace buffer. * @base: address of mapped area @@ -297,6 +320,12 @@ void *auxtrace_buffer__get_data(struct auxtrace_buffer *buffer, int fd); void auxtrace_buffer__put_data(struct auxtrace_buffer *buffer); void auxtrace_buffer__drop_data(struct auxtrace_buffer *buffer); void auxtrace_buffer__free(struct auxtrace_buffer *buffer); + +int auxtrace_heap__add(struct auxtrace_heap *heap, unsigned int queue_nr, + u64 ordinal); +void auxtrace_heap__pop(struct auxtrace_heap *heap); +void auxtrace_heap__free(struct auxtrace_heap *heap); + struct auxtrace_record *auxtrace_record__init(struct perf_evlist *evlist, int *err); -- 2.30.2