perf report: Add infrastructure for a cycles histogram

This adds the basic infrastructure to keep track of cycle counts per
basic block for annotate. We allocate an array similar to the normal
accounting, and then account branch cycles there.

We handle two cases:

cycles per basic block with start and cycles per branch (these are later
used for either IPC or just cycles per BB)

In the start case we cannot handle overlaps, so always the longest basic
block wins.

For the cycles per branch case everything is accurately accounted.

v2: Remove unnecessary checks. Slight restructure. Move
symbol__get_annotation to another patch. Move histogram allocation.
v3: Merged with current tree

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: http://lkml.kernel.org/r/1437233094-12844-4-git-send-email-andi@firstfloor.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 124 insertions, 3 deletions

diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
index 03b7bc70eb66..e0b614648044 100644
--- a/tools/perf/util/annotate.c
+++ b/tools/perf/util/annotate.c
@@ -473,17 +473,73 @@ int symbol__alloc_hist(struct symbol *sym)
 	return 0;
 }
 
+/* The cycles histogram is lazily allocated. */
+static int symbol__alloc_hist_cycles(struct symbol *sym)
+{
+	struct annotation *notes = symbol__annotation(sym);
+	const size_t size = symbol__size(sym);
+
+	notes->src->cycles_hist = calloc(size, sizeof(struct cyc_hist));
+	if (notes->src->cycles_hist == NULL)
+		return -1;
+	return 0;
+}
+
 void symbol__annotate_zero_histograms(struct symbol *sym)
 {
 	struct annotation *notes = symbol__annotation(sym);
 
 	pthread_mutex_lock(&notes->lock);
-	if (notes->src != NULL)
+	if (notes->src != NULL) {
 		memset(notes->src->histograms, 0,
 		       notes->src->nr_histograms * notes->src->sizeof_sym_hist);
+		if (notes->src->cycles_hist)
+			memset(notes->src->cycles_hist, 0,
+				symbol__size(sym) * sizeof(struct cyc_hist));
+	}
 	pthread_mutex_unlock(&notes->lock);
 }
 
+static int __symbol__account_cycles(struct annotation *notes,
+				    u64 start,
+				    unsigned offset, unsigned cycles,
+				    unsigned have_start)
+{
+	struct cyc_hist *ch;
+
+	ch = notes->src->cycles_hist;
+	/*
+	 * For now we can only account one basic block per
+	 * final jump. But multiple could be overlapping.
+	 * Always account the longest one. So when
+	 * a shorter one has been already seen throw it away.
+	 *
+	 * We separately always account the full cycles.
+	 */
+	ch[offset].num_aggr++;
+	ch[offset].cycles_aggr += cycles;
+
+	if (!have_start && ch[offset].have_start)
+		return 0;
+	if (ch[offset].num) {
+		if (have_start && (!ch[offset].have_start ||
+				   ch[offset].start > start)) {
+			ch[offset].have_start = 0;
+			ch[offset].cycles = 0;
+			ch[offset].num = 0;
+			if (ch[offset].reset < 0xffff)
+				ch[offset].reset++;
+		} else if (have_start &&
+			   ch[offset].start < start)
+			return 0;
+	}
+	ch[offset].have_start = have_start;
+	ch[offset].start = start;
+	ch[offset].cycles += cycles;
+	ch[offset].num++;
+	return 0;
+}
+
 static int __symbol__inc_addr_samples(struct symbol *sym, struct map *map,
 				      struct annotation *notes, int evidx, u64 addr)
 {
@@ -506,7 +562,7 @@ static int __symbol__inc_addr_samples(struct symbol *sym, struct map *map,
 	return 0;
 }
 
-static struct annotation *symbol__get_annotation(struct symbol *sym)
+static struct annotation *symbol__get_annotation(struct symbol *sym, bool cycles)
 {
 	struct annotation *notes = symbol__annotation(sym);
 
@@ -514,6 +570,10 @@ static struct annotation *symbol__get_annotation(struct symbol *sym)
 		if (symbol__alloc_hist(sym) < 0)
 			return NULL;
 	}
+	if (!notes->src->cycles_hist && cycles) {
+		if (symbol__alloc_hist_cycles(sym) < 0)
+			return NULL;
+	}
 	return notes;
 }
 
@@ -524,12 +584,73 @@ static int symbol__inc_addr_samples(struct symbol *sym, struct map *map,
 
 	if (sym == NULL)
 		return 0;
-	notes = symbol__get_annotation(sym);
+	notes = symbol__get_annotation(sym, false);
 	if (notes == NULL)
 		return -ENOMEM;
 	return __symbol__inc_addr_samples(sym, map, notes, evidx, addr);
 }
 
+static int symbol__account_cycles(u64 addr, u64 start,
+				  struct symbol *sym, unsigned cycles)
+{
+	struct annotation *notes;
+	unsigned offset;
+
+	if (sym == NULL)
+		return 0;
+	notes = symbol__get_annotation(sym, true);
+	if (notes == NULL)
+		return -ENOMEM;
+	if (addr < sym->start || addr >= sym->end)
+		return -ERANGE;
+
+	if (start) {
+		if (start < sym->start || start >= sym->end)
+			return -ERANGE;
+		if (start >= addr)
+			start = 0;
+	}
+	offset = addr - sym->start;
+	return __symbol__account_cycles(notes,
+					start ? start - sym->start : 0,
+					offset, cycles,
+					!!start);
+}
+
+int addr_map_symbol__account_cycles(struct addr_map_symbol *ams,
+				    struct addr_map_symbol *start,
+				    unsigned cycles)
+{
+	unsigned long saddr = 0;
+	int err;
+
+	if (!cycles)
+		return 0;
+
+	/*
+	 * Only set start when IPC can be computed. We can only
+	 * compute it when the basic block is completely in a single
+	 * function.
+	 * Special case the case when the jump is elsewhere, but
+	 * it starts on the function start.
+	 */
+	if (start &&
+		(start->sym == ams->sym ||
+		 (ams->sym &&
+		   start->addr == ams->sym->start + ams->map->start)))
+		saddr = start->al_addr;
+	if (saddr == 0)
+		pr_debug2("BB with bad start: addr %lx start %lx sym %lx saddr %lx\n",
+			ams->addr,
+			start ? start->addr : 0,
+			ams->sym ? ams->sym->start + ams->map->start : 0,
+			saddr);
+	err = symbol__account_cycles(ams->al_addr, saddr, ams->sym, cycles);
+	if (err)
+		pr_debug2("account_cycles failed %d\n", err);
+	return err;
+}
+
 int addr_map_symbol__inc_samples(struct addr_map_symbol *ams, int evidx)
 {
 	return symbol__inc_addr_samples(ams->sym, ams->map, evidx, ams->al_addr);