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 31BEAC4332F for ; Mon, 19 Dec 2022 20:57:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232558AbiLSU5b (ORCPT ); Mon, 19 Dec 2022 15:57:31 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37966 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232574AbiLSU5Y (ORCPT ); Mon, 19 Dec 2022 15:57:24 -0500 Received: from mail-il1-x136.google.com (mail-il1-x136.google.com [IPv6:2607:f8b0:4864:20::136]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6F5E525F9 for ; Mon, 19 Dec 2022 12:57:24 -0800 (PST) Received: by mail-il1-x136.google.com with SMTP id o8so5387865ilo.1 for ; Mon, 19 Dec 2022 12:57:24 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:from:to:cc:subject:date:message-id:reply-to; bh=BHLoLmIiSoPJZR4YAxyoxo6homLq85o/pXatGwtOBd4=; b=M5IvWyti2zneCdkihUCbhFIXnDGpDURNdh8G/pL8UOONPP0dpLk1YETOXcgQIif9ZW Iz3kYjieWW69i7MLTSxbSqvsbTfeoxTLPrjS9/RWd6rtn2bMANtZMWpBpPAmh4SEbt+Y eEwigiKbpnSeXluNX5eIPfyGXFWs1luPa4IKI8SufRfSZRYcSQbysLRRyL2oVHXoXGFp lJQ3XLTawpGMvNhdKZPqaIlbGYocFgYVRPngsJXxrc7uN0xsyK7BrUmK8KR59U0Rp5N8 uMi5V412Rqgp7t7GkDWE2gZpxd1FZ4DrMlYBUxiPCxKSWJD3XOwLgve+7ljuezEbnxAJ MWHA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=BHLoLmIiSoPJZR4YAxyoxo6homLq85o/pXatGwtOBd4=; b=ZEBOqaojkdF91iqn5p9sfIWdBZOpjAd0DoQyv+lsmBNMmAKebXt7EfK0A/HZF4Q4X0 qouEIP9hmC0uywiG1IC8GXBwINvrYdON4XI+ZVycKseZKsv82pY1SMepfpRMtm7q70CD SWMt/mPheybDoF/X1FE/CsH9vx+eva5X5LLLvqjTYNblRtFmjCRclgjOnioQxDiwQ4uv MXP2coSr/2lfn9EGop7eG5e+LJcltbr1Fmhy9WDk/nDiLQA8FMA+DQ8BBxUNpLFDf4uP jI8pzcW+Z5FoquyWudGqhMUUNQ4uv4nydBUzU47wDrUFem2fr0KjMSOWTlScwnQlYwWw sDXg== X-Gm-Message-State: AFqh2koayPYYGnUN991ILbUO5cbBIRv6OWC2apA5I+aa/doI9y3qu9P3 YVSStUba10XAInqKn1vZrgd0uC5D5a4y/9zg X-Google-Smtp-Source: AMrXdXuDDYR+DHPnYc6sGD78qAsLbyttwkWPBjanNGn40a8uT3LNC2mXQyhlFqcHpqZJ3pL9mxe8+w== X-Received: by 2002:a05:6e02:512:b0:302:c07e:49f8 with SMTP id d18-20020a056e02051200b00302c07e49f8mr7541450ils.32.1671483443381; Mon, 19 Dec 2022 12:57:23 -0800 (PST) Received: from google.com ([2620:15c:183:200:6550:fd9a:e118:25dc]) by smtp.gmail.com with ESMTPSA id v25-20020a02b919000000b0038a5af5e831sm3965386jan.100.2022.12.19.12.57.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 19 Dec 2022 12:57:22 -0800 (PST) Date: Mon, 19 Dec 2022 13:57:18 -0700 From: Ross Zwisler To: Steven Rostedt Cc: linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, Masami Hiramatsu , Andrew Morton , Tom Zanussi , Zheng Yejian Subject: Re: [PATCH 1/2] tracing: Add a way to filter function addresses to function names Message-ID: References: <20221219183106.518341498@goodmis.org> <20221219183213.916833763@goodmis.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20221219183213.916833763@goodmis.org> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Dec 19, 2022 at 01:31:07PM -0500, Steven Rostedt wrote: > From: "Steven Rostedt (Google)" > > There's been several times where an event records a function address in > its field and I needed to filter on that address for a specific function > name. It required looking up the function in kallsyms, finding its size, > and doing a compare of "field >= function_start && field < function_end". > > But this would change from boot to boot and is unreliable in scripts. > Also, it is useful to have this at boot up, where the addresses will not > be known. For example, on the boot command line: > > trace_trigger="initcall_finish.traceoff if func.function == acpi_init" > > To implement this, add a ".function" prefix, that will check that the > field is of size long, and the only operations allowed (so far) are "==" > and "!=". > > Signed-off-by: Steven Rostedt (Google) Reviewed-by: Ross Zwisler