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 gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id C8BD6C36002 for ; Mon, 24 Mar 2025 15:11:09 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 3F1BF10E446; Mon, 24 Mar 2025 15:11:09 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=bootlin.com header.i=@bootlin.com header.b="Jn+0Pamw"; dkim-atps=neutral Received: from relay1-d.mail.gandi.net (relay1-d.mail.gandi.net [217.70.183.193]) by gabe.freedesktop.org (Postfix) with ESMTPS id 5EE8710E43D; Mon, 24 Mar 2025 15:11:04 +0000 (UTC) Received: by mail.gandi.net (Postfix) with ESMTPSA id 772C14326A; Mon, 24 Mar 2025 15:11:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1742829063; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:autocrypt:autocrypt; bh=lzB/MlgxFjVB17b0nuzk9808ANg/fDT6q8Zmuo0nM5Y=; b=Jn+0Pamw6ofwIye7MSSPeuhzKA2zm25rWso7M414k36whV3aWumXa6B7giK9zjFlLzBLMJ TuK2MjlKoJq75WrrROMj/Lp3RAaw+xOmOQFDhKLwibBQBbAvJCOXumvsOIvFyzXbJ+vSAi bAfeJDrD6eiLQyef/IDQKr/8mPLIdHffXRr0omJLGnjwuLOrqmLUWNJHWtPIEcexnzg8F5 Z4q2Tju5Yg7dR3UFlZO7gc232XaXNjNSjZxxkj7tdAaTR0Y4zsjlqOiD2wflRgU+7k216n a94UV99MJUv5TyaZCJzbvQ10V/qTAPpF8jirk6SdZTxY8FClyFuLMNV4megncA== Message-ID: <5ceff8ec-daba-4eaa-8834-ed9276bda7fa@bootlin.com> Date: Mon, 24 Mar 2025 16:11:02 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird From: Louis Chauvet Subject: Re: [PATCH v2 13/59] dyndbg: add 2 new _DPRINTK_FLAGS_: INCL_LOOKUP, PREFIX_CACHED To: Jim Cromie , linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, amd-gfx@lists.freedesktop.org, intel-gvt-dev@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, intel-gfx-trybot@lists.freedesktop.org Cc: jbaron@akamai.com, gregkh@linuxfoundation.org, ukaszb@chromium.org, daniel.vetter@ffwll.ch, tvrtko.ursulin@linux.intel.com, jani.nikula@intel.com, ville.syrjala@linux.intel.com References: <20250320185238.447458-1-jim.cromie@gmail.com> <20250320185238.447458-14-jim.cromie@gmail.com> Content-Language: en-US Autocrypt: addr=louis.chauvet@bootlin.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-GND-State: clean X-GND-Score: -100 X-GND-Cause: gggruggvucftvghtrhhoucdtuddrgeefvddrtddtgdduiedttdelucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecuifetpfffkfdpucggtfgfnhhsuhgsshgtrhhisggvnecuuegrihhlohhuthemuceftddunecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenucfjughrpefkffggfgfhuffvvehfjggtgfesthekredttddvjeenucfhrhhomhepnfhouhhishcuvehhrghuvhgvthcuoehlohhuihhsrdgthhgruhhvvghtsegsohhothhlihhnrdgtohhmqeenucggtffrrghtthgvrhhnpeetfffhtdeigfehffduuedvkeefgfdvuddugfffteetffdvteffgfejvedugffgffenucffohhmrghinhepsghoohhtlhhinhdrtghomhenucfkphepledtrdekledrudeifedruddvjeenucevlhhushhtvghrufhiiigvpedvnecurfgrrhgrmhepihhnvghtpeeltddrkeelrdduieefrdduvdejpdhhvghloheplgduledvrdduieekrddtrddvtdgnpdhmrghilhhfrhhomheplhhouhhishdrtghhrghuvhgvthessghoohhtlhhinhdrtghomhdpnhgspghrtghpthhtohepudegpdhrtghpthhtohepjhhimhdrtghrohhmihgvsehgmhgrihhlrdgtohhmpdhrtghpthhtoheplhhinhhugidqkhgvrhhnvghlsehvghgvrhdrkhgvrhhnvghlrdhorhhgpdhrtghpthhtohepughrihdquggvvhgvlheslhhishhtshdrfhhrvggvuggvshhkthhophdrohhrghdprhgtphhtthhopegrmhguqdhgfhigsehlihhsthhsr dhfrhgvvgguvghskhhtohhprdhorhhgpdhrtghpthhtohepihhnthgvlhdqghhvthdquggvvheslhhishhtshdrfhhrvggvuggvshhkthhophdrohhrghdprhgtphhtthhopehinhhtvghlqdhgfhigsehlihhsthhsrdhfrhgvvgguvghskhhtohhprdhorhhgpdhrtghpthhtohepihhnthgvlhdqghhfgidqthhrhigsohhtsehlihhsthhsrdhfrhgvvgguvghskhhtohhprdhorhhgpdhrtghpthhtohepjhgsrghrohhnsegrkhgrmhgrihdrtghomh X-GND-Sasl: louis.chauvet@bootlin.com X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Le 20/03/2025 à 19:51, Jim Cromie a écrit : > Add _INCL_LOOKUP condition to separate +mfsl flags from +t, allowing > (after refactoring) to avoid a needless call-return. > > Add a PREFIX_CACHED bit to remember that a pr-debug callsite is: > > - enabled, with +p > - wants a dynamic-prefix, with _INCL_LOOKUP > - was previously called > - was thus saved in the prefix cache. NOT YET. > > This allows (later) to cache part/all of the dynamic-prefix for each > pr_debug that gets called. > > NOTES: > > dyndbg's dynamic prefixing can get expensive; each enabled callsite's > prefix is sprintf'd into stack-mem, every time a pr_debug is called. > > A cache would help, if callsites mark _DPRINTK_FLAGS_PREFIX_CACHED > after saving the prefix string. But not yet. > > -t thread-id. not part of the "callsite" info, derived from current. > doesn't belong in the cache. it would be wrong. > can be done in outer: dynamic_emit_prefix() > > -mfsl module, function, source-file, line > we cache these, composed into a sub-string. > they are "lookups", currently to descriptor fields,. > could be accessor macros to "compressed" tables. > > All enabled together, they compose a prefix string like: > > # outer -----inner------------------- > "[tid] module:function:sourcfile:line: " s/sourcfile/sourcesfile/ > > So this patch extracts _DPRINTK_FLAGS_INCL_LOOKUP macro out of > _DPRINTK_FLAGS_INCL_ANY macro, then redefs latter. > > Next re-refactor dynamic_emit_prefix inner/outer fns accordingly. This commit introduces two things: - introduction of _DPRINTK_FLAGS_INCL_LOOKUP, used in a future patch - introduction of _DPRINTK_FLAGS_PREFIX_CACHED, not used in this series I don't think those changes are needed to fix DYNDBG_CLASSMAP, it seems to be an (unfinished?) optimization, so it could make sense to move it to an independent series. Please tell me if I overlooked something! > Signed-off-by: Jim Cromie > --- > include/linux/dynamic_debug.h | 10 ++++++---- > 1 file changed, 6 insertions(+), 4 deletions(-) > > diff --git a/include/linux/dynamic_debug.h b/include/linux/dynamic_debug.h > index c388ab05a6e1..82eabaa6e827 100644 > --- a/include/linux/dynamic_debug.h > +++ b/include/linux/dynamic_debug.h > @@ -38,11 +38,13 @@ struct _ddebug { > #define _DPRINTK_FLAGS_INCL_LINENO (1<<3) > #define _DPRINTK_FLAGS_INCL_TID (1<<4) > #define _DPRINTK_FLAGS_INCL_SOURCENAME (1<<5) > +#define _DPRINTK_FLAGS_PREFIX_CACHED (1<<7) Is there a reason to skip 1 << 6? I don't see any usage of this flag in this series, maybe you can skip it for now and introduce it with the actual implementation of the cache system? Also, I think it make sense to add some documentation on this define. All the other are controlled by the user, but PREFIX_CACHED is controlled by the "dyndbg core", so maybe add something like: /** * _DPRINTK_FLAGS_PREFIX_CACHED - Mark a printk prefix as cached * This bit is set by the callsite to avoid regenerating fixed * part of the prefix at each call */ > > -#define _DPRINTK_FLAGS_INCL_ANY \ > - (_DPRINTK_FLAGS_INCL_MODNAME | _DPRINTK_FLAGS_INCL_FUNCNAME |\ > - _DPRINTK_FLAGS_INCL_LINENO | _DPRINTK_FLAGS_INCL_TID |\ > - _DPRINTK_FLAGS_INCL_SOURCENAME) > +#define _DPRINTK_FLAGS_INCL_LOOKUP \ > + (_DPRINTK_FLAGS_INCL_MODNAME | _DPRINTK_FLAGS_INCL_FUNCNAME | \ > + _DPRINTK_FLAGS_INCL_SOURCENAME | _DPRINTK_FLAGS_INCL_LINENO) > +#define _DPRINTK_FLAGS_INCL_ANY \ > + (_DPRINTK_FLAGS_INCL_TID | _DPRINTK_FLAGS_INCL_LOOKUP) > > #if defined DEBUG > #define _DPRINTK_FLAGS_DEFAULT _DPRINTK_FLAGS_PRINT -- Louis Chauvet, Bootlin Embedded Linux and Kernel engineering https://bootlin.com