TononixOS/ubports_kernel_google_msm
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

perf diff: Use perf_session__fprintf_hists just like 'perf record'

Browse Source 
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

126
tools/perf/util/hist.c
View File

@@ -454,34 +454,80 @@ static size_t hist_entry_callchain__fprintf(FILE *fp, struct hist_entry *self,
return ret;
}
static size_t hist_entry__fprintf(FILE *fp, struct hist_entry *self,
struct perf_session *session)
static size_t hist_entry__fprintf(struct hist_entry *self,
struct perf_session *session,
struct perf_session *pair_session,
bool show_displacement,
long displacement, FILE *fp)
{
struct sort_entry *se;
u64 count, total;
const char *sep = symbol_conf.field_sep;
size_t ret;
if (symbol_conf.exclude_other && !self->parent)
return 0;
if (session->events_stats.total)
ret = percent_color_fprintf(fp,
symbol_conf.field_sep ? "%.2f" : " %6.2f%%",
(self->count * 100.0) / session->events_stats.total);
if (pair_session) {
count = self->pair ? self->pair->count : 0;
total = pair_session->events_stats.total;
} else {
count = self->count;
total = session->events_stats.total;
}
if (total)
ret = percent_color_fprintf(fp, sep ? "%.2f" : " %6.2f%%",
(count * 100.0) / total);
else
ret = fprintf(fp, symbol_conf.field_sep ? "%lld" : "%12lld ", self->count);
ret = fprintf(fp, sep ? "%lld" : "%12lld ", count);
if (symbol_conf.show_nr_samples) {
if (symbol_conf.field_sep)
fprintf(fp, "%c%lld", *symbol_conf.field_sep, self->count);
if (sep)
fprintf(fp, "%c%lld", *sep, count);
else
fprintf(fp, "%11lld", self->count);
fprintf(fp, "%11lld", count);
}
if (pair_session) {
char bf[32];
double old_percent = 0, new_percent = 0, diff;
if (total > 0)
old_percent = (count * 100) / total;
if (session->events_stats.total > 0)
new_percent = (self->count * 100) / session->events_stats.total;
diff = old_percent - new_percent;
if ((u64)diff != 0)
snprintf(bf, sizeof(bf), "%+4.2F%%", diff);
else
snprintf(bf, sizeof(bf), " ");
if (sep)
ret += fprintf(fp, "%c%s", *sep, bf);
else
ret += fprintf(fp, "%11.11s", bf);
if (show_displacement) {
if (displacement)
snprintf(bf, sizeof(bf), "%+4ld", displacement);
else
snprintf(bf, sizeof(bf), " ");
if (sep)
fprintf(fp, "%c%s", *sep, bf);
else
fprintf(fp, "%6.6s", bf);
}
}
list_for_each_entry(se, &hist_entry__sort_list, list) {
if (se->elide)
continue;
fprintf(fp, "%s", symbol_conf.field_sep ?: " ");
fprintf(fp, "%s", sep ?: " ");
ret += se->print(fp, self, se->width ? *se->width : 0);
}
@@ -504,29 +550,49 @@ static size_t hist_entry__fprintf(FILE *fp, struct hist_entry *self,
return ret;
}
size_t perf_session__fprintf_hists(struct perf_session *self, FILE *fp)
size_t perf_session__fprintf_hists(struct perf_session *self,
struct perf_session *pair,
bool show_displacement, FILE *fp)
{
struct hist_entry *pos;
struct sort_entry *se;
struct rb_node *nd;
size_t ret = 0;
unsigned long position = 1;
long displacement = 0;
unsigned int width;
const char *sep = symbol_conf.field_sep;
char *col_width = symbol_conf.col_width_list_str;
init_rem_hits();
fprintf(fp, "# Overhead");
fprintf(fp, "# %s", pair ? "Baseline" : "Overhead");
if (symbol_conf.show_nr_samples) {
if (symbol_conf.field_sep)
fprintf(fp, "%cSamples", *symbol_conf.field_sep);
if (sep)
fprintf(fp, "%cSamples", *sep);
else
fputs(" Samples ", fp);
}
if (pair) {
if (sep)
ret += fprintf(fp, "%cDelta", *sep);
else
ret += fprintf(fp, " Delta ");
if (show_displacement) {
if (sep)
ret += fprintf(fp, "%cDisplacement", *sep);
else
ret += fprintf(fp, " Displ");
}
}
list_for_each_entry(se, &hist_entry__sort_list, list) {
if (se->elide)
continue;
if (symbol_conf.field_sep) {
fprintf(fp, "%c%s", *symbol_conf.field_sep, se->header);
if (sep) {
fprintf(fp, "%c%s", *sep, se->header);
continue;
}
width = strlen(se->header);
@@ -545,12 +611,17 @@ size_t perf_session__fprintf_hists(struct perf_session *self, FILE *fp)
}
fprintf(fp, "\n");
if (symbol_conf.field_sep)
if (sep)
goto print_entries;
fprintf(fp, "# ........");
if (symbol_conf.show_nr_samples)
fprintf(fp, " ..........");
if (pair) {
fprintf(fp, " ..........");
if (show_displacement)
fprintf(fp, " .....");
}
list_for_each_entry(se, &hist_entry__sort_list, list) {
unsigned int i;
@@ -565,14 +636,23 @@ size_t perf_session__fprintf_hists(struct perf_session *self, FILE *fp)
for (i = 0; i < width; i++)
fprintf(fp, ".");
}
fprintf(fp, "\n");
fprintf(fp, "#\n");
fprintf(fp, "\n#\n");
print_entries:
for (nd = rb_first(&self->hists); nd; nd = rb_next(nd)) {
pos = rb_entry(nd, struct hist_entry, rb_node);
ret += hist_entry__fprintf(fp, pos, self);
struct hist_entry *h = rb_entry(nd, struct hist_entry, rb_node);
if (show_displacement) {
if (h->pair != NULL)
displacement = ((long)h->pair->position -
(long)position);
else
displacement = 0;
++position;
}
ret += hist_entry__fprintf(h, self, pair, show_displacement,
displacement, fp);
}
free(rem_sq_bracket);