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From: Frederic Weisbecker on 15 Jul 2010 23:00
Ingo,

Please pull the perf/urgent branch that can be found at:

git://git.kernel.org/pub/scm/linux/kernel/git/frederic/random-tracing.git
perf/urgent

Thanks,
Frederic
---

Frederic Weisbecker (1):
perf: Fix various display bugs with parent filtering


tools/perf/util/hist.c | 21 ++++++++++++++++-----
1 files changed, 16 insertions(+), 5 deletions(-)

---
commit 58c3439083f8fde61de842c93d1407f0f881cd92
Author: Frederic Weisbecker <fweisbec(a)gmail.com>
Date: Fri Jul 16 04:02:14 2010 +0200

perf: Fix various display bugs with parent filtering

Hists that have been filtered, because they don't have callchains
matching the parent filter, won't be printed. As such,
hist_entry__snprintf() returns 0 for them, but we don't control
this value and we always print the buffer, which might be
untouched and then only made of random stack garbage.

Not only does it paint the screen with barf, it also prints
the callchains for these hists, even though they have been filtered,
since the hist has been filtered as well.

We need to check the return value of hist_entry__snprintf() and
ignore the hist if it is 0, which means it didn't get any callchain
matching the parent filter. This fixes the barf and the undesired
callchains.

Reported-by: Ingo Molnar <mingo(a)elte.hu>
Signed-off-by: Frederic Weisbecker <fweisbec(a)gmail.com>
Cc: Ingo Molnar <mingo(a)elte.hu>
Cc: Peter Zijlstra <a.p.zijlstra(a)chello.nl>
Cc: Arnaldo Carvalho de Melo <acme(a)redhat.com>
Cc: Paul Mackerras <paulus(a)samba.org>

diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
index 07f89b6..699cf81 100644
--- a/tools/perf/util/hist.c
+++ b/tools/perf/util/hist.c
@@ -631,9 +631,14 @@ int hist_entry__fprintf(struct hist_entry *self, struct hists *pair_hists,
u64 session_total)
{
char bf[512];
- hist_entry__snprintf(self, bf, sizeof(bf), pair_hists,
- show_displacement, displacement,
- true, session_total);
+ int ret;
+
+ ret = hist_entry__snprintf(self, bf, sizeof(bf), pair_hists,
+ show_displacement, displacement,
+ true, session_total);
+ if (!ret)
+ return 0;
+
return fprintf(fp, "%s\n", bf);
}

@@ -762,6 +767,7 @@ size_t hists__fprintf(struct hists *self, struct hists *pair,
print_entries:
for (nd = rb_first(&self->entries); nd; nd = rb_next(nd)) {
struct hist_entry *h = rb_entry(nd, struct hist_entry, rb_node);
+ int cnt;

if (show_displacement) {
if (h->pair != NULL)
@@ -771,8 +777,13 @@ print_entries:
displacement = 0;
++position;
}
- ret += hist_entry__fprintf(h, pair, show_displacement,
- displacement, fp, self->stats.total_period);
+ cnt = hist_entry__fprintf(h, pair, show_displacement,
+ displacement, fp, self->stats.total_period);
+ /* Ignore those that didn't match the parent filter */
+ if (!cnt)
+ continue;
+
+ ret += cnt;

if (symbol_conf.use_callchain)
ret += hist_entry__fprintf_callchain(h, fp, self->stats.total_period);
--
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