From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E2BFCC2D0CE for ; Tue, 21 Jan 2020 12:05:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B6A4F22314 for ; Tue, 21 Jan 2020 12:05:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1579608322; bh=Lt6QgID2eGmtbKaiFL7vGSjSB08csTbqtNI/8pWwHGY=; h=From:To:Cc:Subject:Date:List-ID:From; b=FtcAArXUG+ZRd+0g+g8Y2lwAdl0fLAwmfZBwXOdBVEVRnJyqiY6eTXF9gwOzr9I/m 4O8A5VAZ5IB37mgaELNvFkkgndoQqXbbUebTee8FhtmcJeXiMapyiLPBMW2nqTSB9P IAP/9Dj3sI63pOfusht4aUzuMAK4EQV4+99GxIdo= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729009AbgAUMFW convert rfc822-to-8bit (ORCPT ); Tue, 21 Jan 2020 07:05:22 -0500 Received: from us-smtp-delivery-1.mimecast.com ([207.211.31.120]:51424 "EHLO us-smtp-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1728831AbgAUMFW (ORCPT ); Tue, 21 Jan 2020 07:05:22 -0500 Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-71-uFXlhn5TO0--SMKwk1f7_Q-1; Tue, 21 Jan 2020 07:05:17 -0500 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id AB3DE477; Tue, 21 Jan 2020 12:05:15 +0000 (UTC) Received: from krava.redhat.com (unknown [10.43.17.48]) by smtp.corp.redhat.com (Postfix) with ESMTP id 0D6F85C28D; Tue, 21 Jan 2020 12:05:12 +0000 (UTC) From: Jiri Olsa To: Alexei Starovoitov , Daniel Borkmann Cc: netdev@vger.kernel.org, bpf@vger.kernel.org, Andrii Nakryiko , Yonghong Song , Martin KaFai Lau , Jakub Kicinski , David Miller , =?UTF-8?q?Bj=C3=B6rn=20T=C3=B6pel?= , John Fastabend Subject: [PATCHv3 0/6] bpf: Add trampoline helpers Date: Tue, 21 Jan 2020 13:05:06 +0100 Message-Id: <20200121120512.758929-1-jolsa@kernel.org> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-MC-Unique: uFXlhn5TO0--SMKwk1f7_Q-1 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: kernel.org Content-Type: text/plain; charset=WINDOWS-1252 Content-Transfer-Encoding: 8BIT Sender: bpf-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org hi, adding helpers for trampolines and 2 other fixes to have kernel support for loading trampoline programs in bcc/bpftrace. Original rfc post [1]. Speedup output of perf bench while running klockstat.py on kprobes vs trampolines: Without: $ perf bench sched messaging -l 50000 ... Total time: 18.571 [sec] With current kprobe tracing: $ perf bench sched messaging -l 50000 ... Total time: 183.395 [sec] With kfunc tracing: $ perf bench sched messaging -l 50000 ... Total time: 39.773 [sec] v3 changes: - added ack from John Fastabend for patch 1 - move out is_bpf_image_address from is_bpf_text_address call [David] v2 changes: - make the unwind work for dispatcher as well - added test for allowed trampolines count - used raw tp pt_regs nest-arrays for trampoline helpers thanks, jirka [1] https://lore.kernel.org/netdev/20191229143740.29143-1-jolsa@kernel.org/ --- Jiri Olsa (6): bpf: Allow ctx access for pointers to scalar bpf: Add bpf_perf_event_output_kfunc bpf: Add bpf_get_stackid_kfunc bpf: Add bpf_get_stack_kfunc bpf: Allow to resolve bpf trampoline and dispatcher in unwind selftest/bpf: Add test for allowed trampolines count include/linux/bpf.h | 12 +++++++++++- kernel/bpf/btf.c | 13 ++++++++++++- kernel/bpf/dispatcher.c | 4 ++-- kernel/bpf/trampoline.c | 82 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++------- kernel/extable.c | 7 +++++-- kernel/trace/bpf_trace.c | 96 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ tools/testing/selftests/bpf/prog_tests/trampoline_count.c | 112 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ tools/testing/selftests/bpf/progs/test_trampoline_count.c | 21 +++++++++++++++++++++ 8 files changed, 334 insertions(+), 13 deletions(-) create mode 100644 tools/testing/selftests/bpf/prog_tests/trampoline_count.c create mode 100644 tools/testing/selftests/bpf/progs/test_trampoline_count.c