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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 397F4C433EF for ; Wed, 27 Apr 2022 21:04:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237243AbiD0VH4 (ORCPT ); Wed, 27 Apr 2022 17:07:56 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49846 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237164AbiD0VHj (ORCPT ); Wed, 27 Apr 2022 17:07:39 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 012BE8878B; Wed, 27 Apr 2022 14:04:24 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id A8992B82AD8; Wed, 27 Apr 2022 21:04:23 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6A74BC385AA; Wed, 27 Apr 2022 21:04:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1651093462; bh=5FwLa1xFrkFZPWtTKRF4rYoUZEPf40so8YMj+Ov7/5U=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=hq2F+2bBa8XOBoycOV7ws1Kz8fuIrlUnfVnPJ5XyTMPpvpZ3OV4gIh52KcEjkTJjq NKZTQJ4T4GuoiNIe7sfAWXjuKfcvNcjY/X2RjoXXNt/nCJYY2HlZbIwLT0q8sbAZKc vQbdkNB+f2SLPZ5uYMNLXwF0ATM0oUCYAYREFwWfkMD0XcCw563Hi2XBwlXnKx0rXs 2HNOosDYu26baMD3BPnl0G1pQgQLEdyJ8e20G8ZKpvicexROTakFeRs+GpHnW3dMtK XkXNtsze1RU+jGPqaGFfx+YszePxZEHZXRlxS/SqmJQzZ+2mQLRR2CGqmWu+d8rjcC T1fSIOPtbv7aw== From: Jiri Olsa To: Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Masami Hiramatsu Cc: netdev@vger.kernel.org, bpf@vger.kernel.org, lkml , Martin KaFai Lau , Song Liu , Yonghong Song , John Fastabend , KP Singh , Steven Rostedt Subject: [PATCHv3 bpf-next 3/5] fprobe: Resolve symbols with ftrace_lookup_symbols Date: Wed, 27 Apr 2022 23:03:43 +0200 Message-Id: <20220427210345.455611-4-jolsa@kernel.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220427210345.455611-1-jolsa@kernel.org> References: <20220427210345.455611-1-jolsa@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Using ftrace_lookup_symbols to speed up symbols lookup in register_fprobe_syms API. This requires syms array to be alphabetically sorted. Signed-off-by: Jiri Olsa --- kernel/trace/fprobe.c | 32 ++++++++++++-------------------- 1 file changed, 12 insertions(+), 20 deletions(-) diff --git a/kernel/trace/fprobe.c b/kernel/trace/fprobe.c index 89d9f994ebb0..aac63ca9c3d1 100644 --- a/kernel/trace/fprobe.c +++ b/kernel/trace/fprobe.c @@ -85,39 +85,31 @@ static void fprobe_exit_handler(struct rethook_node *rh, void *data, } NOKPROBE_SYMBOL(fprobe_exit_handler); +static int symbols_cmp(const void *a, const void *b) +{ + const char **str_a = (const char **) a; + const char **str_b = (const char **) b; + + return strcmp(*str_a, *str_b); +} + /* Convert ftrace location address from symbols */ static unsigned long *get_ftrace_locations(const char **syms, int num) { - unsigned long addr, size; unsigned long *addrs; - int i; /* Convert symbols to symbol address */ addrs = kcalloc(num, sizeof(*addrs), GFP_KERNEL); if (!addrs) return ERR_PTR(-ENOMEM); - for (i = 0; i < num; i++) { - addr = kallsyms_lookup_name(syms[i]); - if (!addr) /* Maybe wrong symbol */ - goto error; - - /* Convert symbol address to ftrace location. */ - if (!kallsyms_lookup_size_offset(addr, &size, NULL) || !size) - goto error; + /* ftrace_lookup_symbols expects sorted symbols */ + sort(syms, num, sizeof(*syms), symbols_cmp, NULL); - addr = ftrace_location_range(addr, addr + size - 1); - if (!addr) /* No dynamic ftrace there. */ - goto error; + if (!ftrace_lookup_symbols(syms, num, addrs)) + return addrs; - addrs[i] = addr; - } - - return addrs; - -error: kfree(addrs); - return ERR_PTR(-ENOENT); } -- 2.35.1