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Tue, 24 Nov 2020 23:59:02 +0000 From: Song Liu To: Jiri Olsa CC: open list , Kernel Team , "peterz@infradead.org" , "mingo@redhat.com" , "acme@kernel.org" , "mark.rutland@arm.com" , "alexander.shishkin@linux.intel.com" , "namhyung@kernel.org" Subject: Re: [RFC 1/2] perf: support build BPF skeletons with perf Thread-Topic: [RFC 1/2] perf: support build BPF skeletons with perf Thread-Index: AQHWvi+b1vCwOQIg40KNUQdgLO76QanXufaAgABFOoA= Date: Tue, 24 Nov 2020 23:59:02 +0000 Message-ID: <05654745-9D53-4D75-BE8E-1B59D7942D3C@fb.com> References: <20201119045046.1491106-1-songliubraving@fb.com> <20201119045046.1491106-2-songliubraving@fb.com> <20201124195115.GC2164284@krava> In-Reply-To: <20201124195115.GC2164284@krava> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-mailer: Apple Mail (2.3608.120.23.2.4) authentication-results: redhat.com; dkim=none (message not signed) header.d=none;redhat.com; dmarc=none action=none header.from=fb.com; x-originating-ip: [2620:10d:c090:400::5:f2e3] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 60d57016-957a-4ede-09fa-08d890d4eafa x-ms-traffictypediagnostic: BYAPR15MB2566: x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: x-fb-source: Internal x-ms-oob-tlc-oobclassifiers: OLM:4502; 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charset="us-ascii" Content-ID: Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: BYAPR15MB2999.namprd15.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 60d57016-957a-4ede-09fa-08d890d4eafa X-MS-Exchange-CrossTenant-originalarrivaltime: 24 Nov 2020 23:59:02.1587 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 8ae927fe-1255-47a7-a2af-5f3a069daaa2 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: O2qKGeTOlGQUs0Uf1F5WPiC81ieeeVDFvuJFe5n92jnqgYOF1SgnF5Z9KS/BV4w6T6vGJ/d1mU50hO3PyvIsBg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR15MB2566 X-OriginatorOrg: fb.com X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.312,18.0.737 definitions=2020-11-24_11:2020-11-24,2020-11-24 signatures=0 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 mlxlogscore=999 clxscore=1015 bulkscore=0 spamscore=0 suspectscore=0 impostorscore=0 phishscore=0 malwarescore=0 adultscore=0 priorityscore=1501 mlxscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2011240140 X-FB-Internal: deliver Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > On Nov 24, 2020, at 11:51 AM, Jiri Olsa wrote: >=20 > On Wed, Nov 18, 2020 at 08:50:45PM -0800, Song Liu wrote: >=20 > SNIP >=20 >> + >> +$(TMP_OUTPUT): >> + $(call msg,MKDIR,$@) >> + $(Q)mkdir -p $(TMP_OUTPUT) >> + >> +$(TMP_OUTPUT)/vmlinux.h: $(VMLINUX_BTF_PATH) | $(TMP_OUTPUT) $(BPFTOOL) >> + $(call msg,GEN,$@) >> + $(Q)if [ ! -e "$(VMLINUX_BTF_PATH)" ] ; then \ >> + echo "Couldn't find kernel BTF; set VMLINUX_BTF to" \ >> + "specify its location." >&2; \ >> + exit 1;\ >> + fi >> + $(Q)$(BPFTOOL) btf dump file $(VMLINUX_BTF_PATH) format c > $@ >> + >> +$(BPFOBJ): $(wildcard $(LIBBPF_SRC)/*.[ch] $(LIBBPF_SRC)/Makefile) | $(= TMP_OUTPUT) >> + $(Q)$(MAKE) $(submake_extras) -C $(LIBBPF_SRC) \ >> + OUTPUT=3D$(abspath $(dir $@))/ $(abspath $@) >> + >> +$(DEFAULT_BPFTOOL): | $(TMP_OUTPUT) >> + $(Q)$(MAKE) $(submake_extras) -C ../../../bpf/bpftool \ >> + prefix=3D OUTPUT=3D$(TMP_OUTPUT)/ DESTDIR=3D$(TMP_OUTPUT) install >=20 > could we build just the bootstrap version of bpftool? > should be enough for skeleton and vmlinux.h dump, no? >=20 Yeah, that should work. I thought about it, but didn't try that hard.=20 Song