linux-kernel - [PATCH] perf report: Allow sorting by symbol size.

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Date:   Fri, 24 Feb 2017 13:32:56 +0000
From:   charles.baylis@...aro.org
To:     peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
        alexander.shishkin@...ux.intel.com
Cc:     linux-kernel@...r.kernel.org, maxim.kuvyrkov@...aro.org,
        Charles Baylis <charles.baylis@...aro.org>
Subject: [PATCH] perf report: Allow sorting by symbol size.

From: Charles Baylis <charles.baylis@...aro.org>

Add new sort key 'symbol_size' to allow user to sort by
symbol size, or (more usefully) display the symbol size
using --fields=...,symbol_size.

Signed-off-by: Charles Baylis <charles.baylis@...aro.org>
---
 tools/perf/Documentation/perf-report.txt |  1 +
 tools/perf/util/hist.h                   |  1 +
 tools/perf/util/sort.c                   | 46 ++++++++++++++++++++++++++++++++
 tools/perf/util/sort.h                   |  1 +
 4 files changed, 49 insertions(+)

diff --git a/tools/perf/Documentation/perf-report.txt b/tools/perf/Documentation/perf-report.txt
index f2914f0..d2a8c15 100644
--- a/tools/perf/Documentation/perf-report.txt
+++ b/tools/perf/Documentation/perf-report.txt
@@ -76,6 +76,7 @@ OPTIONS
 	- pid: command and tid of the task
 	- dso: name of library or module executed at the time of sample
 	- symbol: name of function executed at the time of sample
+	- symbol_size: size of function executed at the time of sample
 	- parent: name of function matched to the parent regex filter. Unmatched
 	entries are displayed as "[other]".
 	- cpu: cpu number the task ran at the time of sample
diff --git a/tools/perf/util/hist.h b/tools/perf/util/hist.h
index 28c216e..2e839bf 100644
--- a/tools/perf/util/hist.h
+++ b/tools/perf/util/hist.h
@@ -57,6 +57,7 @@ enum hist_column {
 	HISTC_SRCLINE_FROM,
 	HISTC_SRCLINE_TO,
 	HISTC_TRACE,
+	HISTC_SYM_SIZE,
 	HISTC_NR_COLS, /* Last entry */
 };
 
diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c
index df622f4..0ad397c 100644
--- a/tools/perf/util/sort.c
+++ b/tools/perf/util/sort.c
@@ -1396,6 +1396,51 @@ struct sort_entry sort_transaction = {
 	.se_width_idx	= HISTC_TRANSACTION,
 };
 
+/* --sort symbol_size */
+
+static int64_t _sort__sym_size_cmp(struct symbol *sym_l, struct symbol *sym_r)
+{
+	int64_t size_l = sym_l != NULL ? sym_l->end - sym_l->start : 0;
+	int64_t size_r = sym_r != NULL ? sym_r->end - sym_r->start : 0;
+
+	return size_l < size_r ? -1 :
+		size_l == size_r ? 0 : 1;
+}
+
+static int64_t
+sort__sym_size_cmp(struct hist_entry *left, struct hist_entry *right)
+{
+	return _sort__sym_size_cmp(right->ms.sym, left->ms.sym);
+}
+
+static int _hist_entry__sym_size_snprintf(struct symbol *sym, char *bf,
+					  size_t bf_size, unsigned int width)
+{
+	if (sym) {
+		int64_t sym_size = sym->end - sym->start;
+
+		return repsep_snprintf(bf, bf_size, "%*lld", width,
+					(long long)sym_size);
+	} else {
+		return repsep_snprintf(bf, bf_size, "%*s", width,
+					"unknown");
+	}
+}
+
+static int hist_entry__sym_size_snprintf(struct hist_entry *he, char *bf,
+					 size_t size, unsigned int width)
+{
+	return _hist_entry__sym_size_snprintf(he->ms.sym, bf, size, width);
+}
+
+struct sort_entry sort_sym_size = {
+	.se_header	= "Symbol size",
+	.se_cmp		= sort__sym_size_cmp,
+	.se_snprintf	= hist_entry__sym_size_snprintf,
+	.se_width_idx	= HISTC_SYM_SIZE,
+};
+
+
 struct sort_dimension {
 	const char		*name;
 	struct sort_entry	*entry;
@@ -1418,6 +1463,7 @@ static struct sort_dimension common_sort_dimensions[] = {
 	DIM(SORT_GLOBAL_WEIGHT, "weight", sort_global_weight),
 	DIM(SORT_TRANSACTION, "transaction", sort_transaction),
 	DIM(SORT_TRACE, "trace", sort_trace),
+	DIM(SORT_SYM_SIZE, "symbol_size", sort_sym_size),
 };
 
 #undef DIM
diff --git a/tools/perf/util/sort.h b/tools/perf/util/sort.h
index 7aff317..acb2c57 100644
--- a/tools/perf/util/sort.h
+++ b/tools/perf/util/sort.h
@@ -211,6 +211,7 @@ enum sort_type {
 	SORT_GLOBAL_WEIGHT,
 	SORT_TRANSACTION,
 	SORT_TRACE,
+	SORT_SYM_SIZE,
 
 	/* branch stack specific sort keys */
 	__SORT_BRANCH_STACK,
-- 
2.7.4