From: Namhyung Kim <namhyung@kernel.org>
To: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Ingo Molnar <mingo@kernel.org>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Jiri Olsa <jolsa@kernel.org>, LKML <linux-kernel@vger.kernel.org>,
kernel-team@lge.com, Masami Hiramatsu <mhiramat@kernel.org>,
Andi Kleen <andi@firstfloor.org>
Subject: [PATCHSET/RFC 0/9] perf tools: Support out-of-tree modules
Date: Fri, 23 Jun 2017 14:48:18 +0900 [thread overview]
Message-ID: <20170623054827.3828-1-namhyung@kernel.org> (raw)
Hello,
Currently perf loads modules only in the canonical directory
(/lib/modules/`uname -r`/). But in some situation users want to use
local or out-of-tree modules which are not placed in the directory.
One example is developing kernel in a qemu environment. In this case,
guest doesn't see vmlinux or modules but one can load a module in some
directory which was copied separately. During the development, the
module can be unloaded, fixed and reloaded more than once.
I notice that perf uses symbols in /proc/kallsyms (and /proc/kcore)
and it sometimes shows different result with a same data file. This
was due to a same module being loaded at a different address or a
reworked module being loaded at a same address.
I think it needs to use build-id cache if possible. To do that we
need to add an option to search modules and to save them in the
build-id cache automatically.
The code is available on 'perf/kmod-dir-v1' branch at
git://git.kernel.org/pub/scm/linux/kernel/git/namhyung/linux-perf.git
Thanks,
Namhyung
Namhyung Kim (9):
perf symbols: Use absolute address to fixup map address
perf tools: Remove duplicate code
perf symbols: Discard symbols in kallsyms for loaded modules
perf symbols: Load kernel module symbols ASAP
perf symbols: Fixup the end address of kernel map properly
perf symbols: Use already loaded module dso when loading kcore
perf tools: Add symbol_conf.use_kcore
perf record: Not use kcore by default
perf record: Add --module-dir option
tools/perf/Documentation/perf-record.txt | 6 ++++
tools/perf/builtin-record.c | 7 ++++
tools/perf/perf-with-kcore.sh | 1 +
tools/perf/util/machine.c | 33 ++++++++---------
tools/perf/util/map.c | 4 +--
tools/perf/util/symbol.c | 61 +++++++++++++++++---------------
tools/perf/util/symbol.h | 6 ++--
7 files changed, 69 insertions(+), 49 deletions(-)
--
2.13.1
next reply other threads:[~2017-06-23 5:48 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-23 5:48 Namhyung Kim [this message]
2017-06-23 5:48 ` [PATCH/RFC 1/9] perf symbols: Use absolute address to fixup map address Namhyung Kim
2017-06-23 5:48 ` [PATCH/RFC 2/9] perf tools: Remove duplicate code Namhyung Kim
2017-06-23 5:48 ` [PATCH/RFC 3/9] perf symbols: Discard symbols in kallsyms for loaded modules Namhyung Kim
2017-06-23 13:51 ` Arnaldo Carvalho de Melo
2017-06-25 13:47 ` Namhyung Kim
2017-06-23 5:48 ` [PATCH/RFC 4/9] perf symbols: Load kernel module symbols ASAP Namhyung Kim
2017-06-23 14:26 ` Arnaldo Carvalho de Melo
2017-06-25 14:17 ` Namhyung Kim
2017-06-23 5:48 ` [PATCH/RFC 5/9] perf symbols: Fixup the end address of kernel map properly Namhyung Kim
2017-06-23 14:27 ` Arnaldo Carvalho de Melo
2017-06-25 14:34 ` Namhyung Kim
2017-06-23 5:48 ` [PATCH/RFC 6/9] perf symbols: Use already loaded module dso when loading kcore Namhyung Kim
2017-06-23 13:55 ` Arnaldo Carvalho de Melo
2017-06-25 13:54 ` Namhyung Kim
2017-06-23 5:48 ` [PATCH/RFC 7/9] perf tools: Add symbol_conf.use_kcore Namhyung Kim
2017-06-23 5:48 ` [PATCH/RFC 8/9] perf record: Not use kcore by default Namhyung Kim
2017-06-23 5:48 ` [PATCH/RFC 9/9] perf record: Add --module-dir option Namhyung Kim
2017-06-23 14:45 ` Arnaldo Carvalho de Melo
2017-06-25 14:43 ` Namhyung Kim
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