linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: tip-bot for Namhyung Kim <tipbot@zytor.com>
To: linux-tip-commits@vger.kernel.org
Cc: acme@redhat.com, linux-kernel@vger.kernel.org, paulus@samba.org,
	hpa@zytor.com, mingo@kernel.org, a.p.zijlstra@chello.nl,
	torvalds@linux-foundation.org, namhyung.kim@lge.com,
	namhyung@kernel.org, jolsa@redhat.com, dsahern@gmail.com,
	tglx@linutronix.de
Subject: [tip:perf/core] perf tools: Compare dso' s also when comparing symbols
Date: Wed, 23 Oct 2013 00:54:57 -0700	[thread overview]
Message-ID: <tip-09600e0f9ebb06235b852a646a3644b7d4a71aca@git.kernel.org> (raw)
In-Reply-To: <1381802517-18812-1-git-send-email-namhyung@kernel.org>

Commit-ID:  09600e0f9ebb06235b852a646a3644b7d4a71aca
Gitweb:     http://git.kernel.org/tip/09600e0f9ebb06235b852a646a3644b7d4a71aca
Author:     Namhyung Kim <namhyung.kim@lge.com>
AuthorDate: Tue, 15 Oct 2013 11:01:56 +0900
Committer:  Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Mon, 21 Oct 2013 17:33:23 -0300

perf tools: Compare dso's also when comparing symbols

Linus reported that sometimes 'perf report -s symbol' exits without any
message on TUI.  David and Jiri found that it's because it failed to add
a hist entry due to an invalid symbol length.

It turns out that sorting by symbol (address) was broken since it only
compares symbol addresses.  The symbol address is a relative address
within a dso thus just checking its address can result in merging
unrelated symbols together.  Fix it by checking dso before comparing
symbol address.

Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1381802517-18812-1-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/util/sort.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c
index 32c5637..1f9821d 100644
--- a/tools/perf/util/sort.c
+++ b/tools/perf/util/sort.c
@@ -182,9 +182,19 @@ static int64_t _sort__sym_cmp(struct symbol *sym_l, struct symbol *sym_r)
 static int64_t
 sort__sym_cmp(struct hist_entry *left, struct hist_entry *right)
 {
+	int64_t ret;
+
 	if (!left->ms.sym && !right->ms.sym)
 		return right->level - left->level;
 
+	/*
+	 * comparing symbol address alone is not enough since it's a
+	 * relative address within a dso.
+	 */
+	ret = sort__dso_cmp(left, right);
+	if (ret != 0)
+		return ret;
+
 	return _sort__sym_cmp(left->ms.sym, right->ms.sym);
 }
 

      parent reply	other threads:[~2013-10-23  7:55 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-10-15  2:01 [PATCH 1/2] perf tools: Compare dso's " Namhyung Kim
2013-10-15  2:01 ` [RFC/PATCH 2/2] perf tools: Sort dso using pointers Namhyung Kim
2013-10-15  6:08 ` [PATCH 1/2] perf tools: Compare dso's also when comparing symbols Ingo Molnar
2013-10-15  7:12   ` Namhyung Kim
2013-10-23  7:54 ` tip-bot for Namhyung Kim [this message]

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=tip-09600e0f9ebb06235b852a646a3644b7d4a71aca@git.kernel.org \
    --to=tipbot@zytor.com \
    --cc=a.p.zijlstra@chello.nl \
    --cc=acme@redhat.com \
    --cc=dsahern@gmail.com \
    --cc=hpa@zytor.com \
    --cc=jolsa@redhat.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-tip-commits@vger.kernel.org \
    --cc=mingo@kernel.org \
    --cc=namhyung.kim@lge.com \
    --cc=namhyung@kernel.org \
    --cc=paulus@samba.org \
    --cc=tglx@linutronix.de \
    --cc=torvalds@linux-foundation.org \
    --subject='Re: [tip:perf/core] perf tools: Compare dso'\'' s also when comparing symbols' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
on how to clone and mirror all data and code used for this inbox