Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761214Ab2FVFlX (ORCPT ); Fri, 22 Jun 2012 01:41:23 -0400 Received: from LGEMRELSE1Q.lge.com ([156.147.1.111]:43654 "EHLO LGEMRELSE1Q.lge.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757584Ab2FVFlW (ORCPT ); Fri, 22 Jun 2012 01:41:22 -0400 X-AuditID: 9c93016f-b7cbdae0000024ac-47-4fe4057f4b87 From: Namhyung Kim To: Arnaldo Carvalho de Melo Cc: Peter Zijlstra , Paul Mackerras , Ingo Molnar , LKML , Jiri Olsa , David Ahern Subject: [RFC/PATCHSET 0/8] perf tools: Minimal build without libelf dependency (v2) Date: Fri, 22 Jun 2012 14:37:34 +0900 Message-Id: <1340343462-15556-1-git-send-email-namhyung@kernel.org> X-Mailer: git-send-email 1.7.10.2 X-Brightmail-Tracker: AAAAAA== Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4451 Lines: 103 Hi, Current build procedure of perf tools requires a couple of external libraries. Although most of them are optional, elfutils' libelf is mandatory for resolving symbols and build-id of the binaries being profiled. For some reason, it makes embedded guys' life harder who want to build and run perf tools on their boards. This patchset tries to fix the problem by letting the perf could be built without the libelf. The initial intent was just providing perf record command to gather performance events interested on the system and copies perf.data to development box to be used by (full- fledged) perf report for analysis. However it's changed to have most of perf commands as is because perf can resolve kernel symbols without libelf and many of perf commands deal (mostly) with kernel events - so no need to restrict capability of perf tools. Therefore, the end result is not so minimalistic actually and the only thing it cannot do is "perf probe". And then I realized that the perf record needs to know about the build-id's anyway. :( So I implemented a poor man's version of elf parser only for parsing the build-id info. In addition, I changed my mind to keep unrelated configurations - i.g. tui/gui and perf/python support - enabled by default so that it can be configured by a find-grained config method in the future. To build a minimal perf tools explicitly, pass NO_LIBELF=1 to make. Or, if the system doesn't provide the elfutils it'll detect that and converts to the minimal build mode automatically. The resulting perf report will not display symbol names in userland: # Samples: 3K of event 'cycles' # Event count (approx.): 3740267998 # # Overhead Command Shared Object Symbol # ........ ....... ................. .............................. # 99.70% noploop noploop [.] 0x000000000000066d 0.10% noploop [kernel.kallsyms] [k] free_pgd_range 0.03% noploop [kernel.kallsyms] [k] native_write_msr_safe 0.03% noploop [kernel.kallsyms] [k] raise_softirq 0.03% noploop [kernel.kallsyms] [k] rb_insert_color But perf buildid-list can show the build-id's: $ ./perf buildid-list --with-hits 5eaf1839576cc801053e63300762def90a77a305 [kernel.kallsyms] 43a7a2b399b6ee2ff29c6bdadbda6bff88712ed4 /home/namhyung/bin/noploop So it can be packed using perf archive command and copied and analized with full-fledged perf tools on a development machine. This patchset is based on current tip 32c46e579b68 ("Merge tag 'perf-core-for-mingo' ...") and tested on x86_64 and ARM. Any comments are welcome. Namhyung v2: * change make option name to NO_LIBELF * make it default when libelf doesn't exist (by Ingo) * get rid of elf-minimal.h and use elf.h (by Jiri) Namhyung Kim (8): perf evsel: Fix a build failure on cross compilation tools lib traceevent: Make dependency files regeneratable tools lib traceevent: Detect build environment changes perf symbols: Introduce symbol__elf_init() perf symbols: Do not use ELF's symbol binding constants perf tools: Split out util/symbol-elf.c perf tools: Support minimal build without libelf perf symbols: Implement poor man's ELF parser tools/lib/traceevent/Makefile | 18 +- tools/perf/Makefile | 58 ++- tools/perf/builtin-buildid-list.c | 4 +- tools/perf/builtin-inject.c | 5 +- tools/perf/builtin-top.c | 5 +- tools/perf/command-list.txt | 2 +- tools/perf/perf.c | 2 + tools/perf/ui/browsers/map.c | 5 +- tools/perf/util/evsel.c | 1 - tools/perf/util/generate-cmdlist.sh | 15 + tools/perf/util/map.c | 3 +- tools/perf/util/symbol-elf.c | 719 ++++++++++++++++++++++++++++++++++ tools/perf/util/symbol-minimal.c | 261 ++++++++++++ tools/perf/util/symbol.c | 740 +---------------------------------- tools/perf/util/symbol.h | 20 + 15 files changed, 1110 insertions(+), 748 deletions(-) create mode 100644 tools/perf/util/symbol-elf.c create mode 100644 tools/perf/util/symbol-minimal.c -- 1.7.10.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/