[PATCH 2/2] perfcounters: print a sorted summary of annotated overhead lines
From: Frederic Weisbecker
Date: Fri Jun 12 2009 - 18:11:51 EST
It's can be very annoying to scroll down perf annotated output
until we find relevant overhead.
Using the -l option, you can now have a small summary sorted per
overhead in the beginning of the output.
Example:
./perf annotate -l -k ../../vmlinux -s __lock_acquire
Sorted summary for file ../../vmlinux
----------------------------------------------
12.04 /home/fweisbec/linux/linux-2.6-tip/kernel/lockdep.c:1653
4.61 /home/fweisbec/linux/linux-2.6-tip/kernel/lockdep.c:1740
3.77 /home/fweisbec/linux/linux-2.6-tip/kernel/lockdep.c:1775
3.56 /home/fweisbec/linux/linux-2.6-tip/kernel/lockdep.c:1653
2.93 /home/fweisbec/linux/linux-2.6-tip/arch/x86/include/asm/irqflags.h:15
2.83 /home/fweisbec/linux/linux-2.6-tip/kernel/lockdep.c:2545
2.30 /home/fweisbec/linux/linux-2.6-tip/kernel/lockdep.c:2594
2.20 /home/fweisbec/linux/linux-2.6-tip/kernel/lockdep.c:2388
2.20 /home/fweisbec/linux/linux-2.6-tip/kernel/lockdep.c:730
2.09 /home/fweisbec/linux/linux-2.6-tip/kernel/lockdep.c:730
2.09 /home/fweisbec/linux/linux-2.6-tip/kernel/lockdep.c:138
1.88 /home/fweisbec/linux/linux-2.6-tip/kernel/lockdep.c:2548
1.47 /home/fweisbec/linux/linux-2.6-tip/arch/x86/include/asm/irqflags.h:15
1.36 /home/fweisbec/linux/linux-2.6-tip/kernel/lockdep.c:2594
1.36 /home/fweisbec/linux/linux-2.6-tip/kernel/lockdep.c:730
1.26 /home/fweisbec/linux/linux-2.6-tip/kernel/lockdep.c:1654
1.26 /home/fweisbec/linux/linux-2.6-tip/kernel/lockdep.c:1653
1.15 /home/fweisbec/linux/linux-2.6-tip/kernel/lockdep.c:2592
1.15 /home/fweisbec/linux/linux-2.6-tip/kernel/lockdep.c:1740
1.15 /home/fweisbec/linux/linux-2.6-tip/kernel/lockdep.c:1740
[...]
Only overhead over 0.5% are summarized.
Signed-off-by: Frederic Weisbecker <fweisbec@xxxxxxxxx>
---
tools/perf/builtin-annotate.c | 111 +++++++++++++++++++++++++++++++++--------
1 files changed, 90 insertions(+), 21 deletions(-)
diff --git a/tools/perf/builtin-annotate.c b/tools/perf/builtin-annotate.c
index 6a08da4..7a5b278 100644
--- a/tools/perf/builtin-annotate.c
+++ b/tools/perf/builtin-annotate.c
@@ -25,6 +25,10 @@
#define SHOW_USER 2
#define SHOW_HV 4
+#define MIN_GREEN 0.5
+#define MIN_RED 5.0
+
+
static char const *input_name = "perf.data";
static char *vmlinux = "vmlinux";
@@ -88,6 +92,7 @@ typedef union event_union {
struct sym_ext {
+ struct rb_node node;
double percent;
char *path;
};
@@ -1038,6 +1043,24 @@ process_event(event_t *event, unsigned long offset, unsigned long head)
return 0;
}
+static char *get_color(double percent)
+{
+ char *color = PERF_COLOR_NORMAL;
+
+ /*
+ * We color high-overhead entries in red, mid-overhead
+ * entries in green - and keep the low overhead places
+ * normal:
+ */
+ if (percent >= MIN_RED)
+ color = PERF_COLOR_RED;
+ else {
+ if (percent > MIN_GREEN)
+ color = PERF_COLOR_GREEN;
+ }
+ return color;
+}
+
static int
parse_line(FILE *file, struct symbol *sym, __u64 start, __u64 len)
{
@@ -1086,7 +1109,7 @@ parse_line(FILE *file, struct symbol *sym, __u64 start, __u64 len)
const char *path = NULL;
unsigned int hits = 0;
double percent = 0.0;
- char *color = PERF_COLOR_NORMAL;
+ char *color;
struct sym_ext *sym_ext = sym->priv;
offset = line_ip - start;
@@ -1099,17 +1122,7 @@ parse_line(FILE *file, struct symbol *sym, __u64 start, __u64 len)
} else if (sym->hist_sum)
percent = 100.0 * hits / sym->hist_sum;
- /*
- * We color high-overhead entries in red, mid-overhead
- * entries in green - and keep the low overhead places
- * normal:
- */
- if (percent >= 5.0)
- color = PERF_COLOR_RED;
- else {
- if (percent > 0.5)
- color = PERF_COLOR_GREEN;
- }
+ color = get_color(percent);
/*
* Also color the filename and line if needed, with
@@ -1138,6 +1151,28 @@ parse_line(FILE *file, struct symbol *sym, __u64 start, __u64 len)
return 0;
}
+static struct rb_root root_sym_ext;
+
+static void insert_source_line(struct sym_ext *sym_ext)
+{
+ struct sym_ext *iter;
+ struct rb_node **p = &root_sym_ext.rb_node;
+ struct rb_node *parent = NULL;
+
+ while (*p != NULL) {
+ parent = *p;
+ iter = rb_entry(parent, struct sym_ext, node);
+
+ if (sym_ext->percent > iter->percent)
+ p = &(*p)->rb_left;
+ else
+ p = &(*p)->rb_right;
+ }
+
+ rb_link_node(&sym_ext->node, parent, p);
+ rb_insert_color(&sym_ext->node, &root_sym_ext);
+}
+
static void free_source_line(struct symbol *sym, int len)
{
struct sym_ext *sym_ext = sym->priv;
@@ -1151,6 +1186,7 @@ static void free_source_line(struct symbol *sym, int len)
free(sym_ext);
sym->priv = NULL;
+ root_sym_ext = RB_ROOT;
}
/* Get the filename:line for the colored entries */
@@ -1193,12 +1229,42 @@ static void get_source_line(struct symbol *sym, __u64 start, int len)
goto next;
strcpy(sym_ext[i].path, path);
+ insert_source_line(&sym_ext[i]);
next:
pclose(fp);
}
}
+static void print_summary(char *filename)
+{
+ struct sym_ext *sym_ext;
+ struct rb_node *node;
+
+ printf("\nSorted summary for file %s\n", filename);
+ printf("----------------------------------------------\n\n");
+
+ if (RB_EMPTY_ROOT(&root_sym_ext)) {
+ printf(" Nothing higher than %1.1f%%\n", MIN_GREEN);
+ return;
+ }
+
+ node = rb_first(&root_sym_ext);
+ while (node) {
+ double percent;
+ char *color;
+ char *path;
+
+ sym_ext = rb_entry(node, struct sym_ext, node);
+ percent = sym_ext->percent;
+ color = get_color(percent);
+ path = sym_ext->path;
+
+ color_fprintf(stdout, color, " %7.2f %s", percent, path);
+ node = rb_next(node);
+ }
+}
+
static void annotate_sym(struct dso *dso, struct symbol *sym)
{
char *filename = dso->name;
@@ -1211,13 +1277,6 @@ static void annotate_sym(struct dso *dso, struct symbol *sym)
if (dso == kernel_dso)
filename = vmlinux;
- printf("\n------------------------------------------------\n");
- printf(" Percent | Source code & Disassembly of %s\n", filename);
- printf("------------------------------------------------\n");
-
- if (verbose >= 2)
- printf("annotating [%p] %30s : [%p] %30s\n", dso, dso->name, sym, sym->name);
-
start = sym->obj_start;
if (!start)
start = sym->start;
@@ -1225,8 +1284,17 @@ static void annotate_sym(struct dso *dso, struct symbol *sym)
end = start + sym->end - sym->start + 1;
len = sym->end - sym->start;
- if (print_line)
+ if (print_line) {
get_source_line(sym, start, len);
+ print_summary(filename);
+ }
+
+ printf("\n\n------------------------------------------------\n");
+ printf(" Percent | Source code & Disassembly of %s\n", filename);
+ printf("------------------------------------------------\n");
+
+ if (verbose >= 2)
+ printf("annotating [%p] %30s : [%p] %30s\n", dso, dso->name, sym, sym->name);
sprintf(command, "objdump --start-address=0x%016Lx --stop-address=0x%016Lx -dS %s", (__u64)start, (__u64)end, filename);
@@ -1243,7 +1311,8 @@ static void annotate_sym(struct dso *dso, struct symbol *sym)
}
pclose(file);
- free_source_line(sym, len);
+ if (print_line)
+ free_source_line(sym, len);
}
static void find_annotations(void)
--
1.6.2.3
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/