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perf diff: Use perf_session__fprintf_hists just like 'perf record'

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That means that almost everything you can do with 'perf report'
can be done with 'perf diff', for instance:

$ perf record -f find / > /dev/null
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.062 MB perf.data (~2699
samples) ] $ perf record -f find / > /dev/null
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.062 MB perf.data (~2687
samples) ] perf diff | head -8
     9.02%     +1.00%     find  libc-2.10.1.so               [.] _IO_vfprintf_internal
     2.91%     -1.00%     find  [kernel]                     [k] __kmalloc
     2.85%     -1.00%     find  [kernel]                     [k] ext4_htree_store_dirent
     1.99%     -1.00%     find  [kernel]                     [k] _atomic_dec_and_lock
     2.44%                find  [kernel]                     [k] half_md4_transform
$

So if you want to zoom into libc:

$ perf diff --dsos libc-2.10.1.so | head -8
    37.34%                find  [.] _IO_vfprintf_internal
    10.34%                find  [.] __GI_memmove
     8.25%     +2.00%     find  [.] _int_malloc
     5.07%     -1.00%     find  [.] __GI_mempcpy
     7.62%     +2.00%     find  [.] _int_free
$

And if there were multiple commands using libc, it is also
possible to aggregate them all by using --sort symbol:

$ perf diff --dsos libc-2.10.1.so --sort symbol | head -8
    37.34%             [.] _IO_vfprintf_internal
    10.34%             [.] __GI_memmove
     8.25%     +2.00%  [.] _int_malloc
     5.07%     -1.00%  [.] __GI_mempcpy
     7.62%     +2.00%  [.] _int_free
$

The displacement column now is off by default, to use it:

perf diff -m --dsos libc-2.10.1.so --sort symbol | head -8
    37.34%                   [.] _IO_vfprintf_internal
    10.34%                   [.] __GI_memmove
     8.25%     +2.00%        [.] _int_malloc
     5.07%     -1.00%    +2  [.] __GI_mempcpy
     7.62%     +2.00%    -1  [.] _int_free
$

Using -t/--field-separator can be used for scripting:

$ perf diff -t, -m --dsos libc-2.10.1.so --sort symbol | head -8
37.34, , ,[.] _IO_vfprintf_internal
10.34, , ,[.] __GI_memmove
8.25,+2.00%, ,[.] _int_malloc
5.07,-1.00%,  +2,[.] __GI_mempcpy
7.62,+2.00%,  -1,[.] _int_free
6.99,+1.00%,  -1,[.] _IO_new_file_xsputn
1.89,-2.00%,  +4,[.] __readdir64
$

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: <1260978567-550-1-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Arnaldo Carvalho de Melo 2009-12-16 13:49:27 -02:00 • committed by Ingo Molnar
parent 125c4fad1e
commit c351c28161
8 changed files with 169 additions and 110 deletions
Download patch file Download diff file Expand all files Collapse all files

90
tools/perf/builtin-diff.c
View file

@ -16,10 +16,10 @@
#include <stdlib.h>
static char const *input_old = "perf.data.old",
*input_new = "perf.data";
static int force;
static bool show_percent;
static char const *input_old = "perf.data.old",
*input_new = "perf.data";
static int force;
static bool show_displacement;
static int perf_session__add_hist_entry(struct perf_session *self,
struct addr_location *al, u64 count)
@ -162,70 +162,6 @@ static void perf_session__match_hists(struct perf_session *old_session,
}
}
static size_t hist_entry__fprintf_matched(struct hist_entry *self,
unsigned long pos,
struct perf_session *session,
struct perf_session *pair_session,
FILE *fp)
{
u64 old_count = 0;
char displacement[16];
size_t printed;
if (self->pair != NULL) {
long pdiff = (long)self->pair->position - (long)pos;
old_count = self->pair->count;
if (pdiff == 0)
goto blank;
snprintf(displacement, sizeof(displacement), "%+4ld", pdiff);
} else {
blank: memset(displacement, ' ', sizeof(displacement));
}
printed = fprintf(fp, "%4lu %5.5s ", pos, displacement);
if (show_percent) {
double old_percent = 0, new_percent = 0, diff;
if (pair_session->events_stats.total > 0)
old_percent = (old_count * 100) / pair_session->events_stats.total;
if (session->events_stats.total > 0)
new_percent = (self->count * 100) / session->events_stats.total;
diff = old_percent - new_percent;
if (verbose)
printed += fprintf(fp, " %3.2f%% %3.2f%%", old_percent, new_percent);
if ((u64)diff != 0)
printed += fprintf(fp, " %+4.2F%%", diff);
else
printed += fprintf(fp, " ");
} else {
if (verbose)
printed += fprintf(fp, " %9Lu %9Lu", old_count, self->count);
printed += fprintf(fp, " %+9Ld", (s64)self->count - (s64)old_count);
}
return printed + fprintf(fp, " %25.25s %s\n",
self->map->dso->name, self->sym->name);
}
static size_t perf_session__fprintf_matched_hists(struct perf_session *self,
struct perf_session *pair,
FILE *fp)
{
struct rb_node *nd;
size_t printed = 0;
unsigned long pos = 1;
for (nd = rb_first(&self->hists); nd; nd = rb_next(nd)) {
struct hist_entry *he = rb_entry(nd, struct hist_entry, rb_node);
printed += hist_entry__fprintf_matched(he, pos++, self, pair, fp);
}
return printed;
}
static int __cmd_diff(void)
{
int ret, i;
@ -244,7 +180,8 @@ static int __cmd_diff(void)
}
perf_session__match_hists(session[0], session[1]);
perf_session__fprintf_matched_hists(session[1], session[0], stdout);
perf_session__fprintf_hists(session[1], session[0],
show_displacement, stdout);
out_delete:
for (i = 0; i < 2; ++i)
perf_session__delete(session[i]);
@ -258,13 +195,13 @@ static const char *const diff_usage[] = {
static const struct option options[] = {
OPT_BOOLEAN('v', "verbose", &verbose,
"be more verbose (show symbol address, etc)"),
OPT_BOOLEAN('m', "displacement", &show_displacement,
"Show position displacement relative to baseline"),
OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
"dump raw trace in ASCII"),
OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules,
"load module symbols - WARNING: use only with -k and LIVE kernel"),
OPT_BOOLEAN('p', "percentages", &show_percent,
"Don't shorten the pathnames taking into account the cwd"),
OPT_BOOLEAN('P', "full-paths", &event_ops.full_paths,
"Don't shorten the pathnames taking into account the cwd"),
OPT_STRING('d', "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
@ -273,6 +210,11 @@ static const struct option options[] = {
"only consider symbols in these comms"),
OPT_STRING('S', "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
"only consider these symbols"),
OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
"sort by key(s): pid, comm, dso, symbol, parent"),
OPT_STRING('t', "field-separator", &symbol_conf.field_sep, "separator",
"separator for columns, no spaces will be added between "
"columns '.' is reserved."),
OPT_END()
};
@ -289,10 +231,16 @@ int cmd_diff(int argc, const char **argv, const char *prefix __used)
input_new = argv[0];
}
symbol_conf.exclude_other = false;
if (symbol__init() < 0)
return -1;
setup_sorting(diff_usage, options);
setup_pager();
sort_entry__setup_elide(&sort_dso, symbol_conf.dso_list, "dso", NULL);
sort_entry__setup_elide(&sort_comm, symbol_conf.comm_list, "comm", NULL);
sort_entry__setup_elide(&sort_sym, symbol_conf.sym_list, "symbol", NULL);
return __cmd_diff();
}