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perf top: Allocate space only for the number of counters used

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Reducing memory consumption on a typical desktop machine:

From:

32710 root      20   0  172m 142m 1056 S  0.0  4.7   0:00.37
perf

To:

  420 root      20   0 47528  16m 1056 R  0.3  0.5   0:00.24 perf

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1258490282-1821-2-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Arnaldo Carvalho de Melo 2009-11-17 18:38:01 -02:00 committed by Ingo Molnar
parent 51a472decb
commit 5a8e5a3065
1 changed files with 5 additions and 4 deletions
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9
tools/perf/builtin-top.c
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@ -111,7 +111,6 @@ static int display_weighted = -1;
struct sym_entry {
struct rb_node rb_node;
struct list_head node;
unsigned long count[MAX_COUNTERS];
unsigned long snap_count;
double weight;
int skip;
@ -122,6 +121,7 @@ struct sym_entry {
struct source_line *lines;
struct source_line **lines_tail;
pthread_mutex_t source_lock;
unsigned long count[0];
};
/*
@ -130,7 +130,7 @@ struct sym_entry {
static inline struct symbol *sym_entry__symbol(struct sym_entry *self)
{
return (struct symbol *)(self + 1);
return ((void *)self) + symbol__priv_size;
}
static void get_term_dimensions(struct winsize *ws)
@ -1314,8 +1314,6 @@ int cmd_top(int argc, const char **argv, const char *prefix __used)
{
int counter;
symbol__init(sizeof(struct sym_entry));
page_size = sysconf(_SC_PAGE_SIZE);
argc = parse_options(argc, argv, options, top_usage, 0);
@ -1332,6 +1330,9 @@ int cmd_top(int argc, const char **argv, const char *prefix __used)
if (!nr_counters)
nr_counters = 1;
symbol__init(sizeof(struct sym_entry) +
(nr_counters + 1) * sizeof(unsigned long));
if (delay_secs < 1)
delay_secs = 1;