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 5E565C3600B for ; Mon, 24 Mar 2025 15:14:40 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 26EB710E306; Mon, 24 Mar 2025 15:14:39 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=bootlin.com header.i=@bootlin.com header.b="BFersAPP"; dkim-atps=neutral Received: from relay9-d.mail.gandi.net (relay9-d.mail.gandi.net [217.70.183.199]) by gabe.freedesktop.org (Postfix) with ESMTPS id 346E910E26F; Mon, 24 Mar 2025 15:14:36 +0000 (UTC) Received: by mail.gandi.net (Postfix) with ESMTPSA id 835754438E; Mon, 24 Mar 2025 15:14:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1742829273; 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=X+xRWMfgpazi5bz6X/63u3KzL97Pz3WCruxBOwSplIk=; b=BFersAPPRIenTcZ6S+cXm+yKxMyBJrCNX+eEa738UcDkHCKRbBJStvAFnbg7835ficsuRw mN+1CRSkWq+6HvJZxM2h74XoMvxj84igcyjCpwh4Qyk3h8sl4r+6znCyPfS26opzEpPlJC /bS67m3yGCG2Ej3/cGV8y+ZAyWg35b42bBwE+t3G4pzKrAsnfU7vFLG0+4XaMOhNto2nPj URrY3IiwuSq2/hTTbQbzF4DNlP9+L0hQ2Czphzr6CD9R6s/iSPq/0O2d3TIPXG490dkglc ErS7LpqkVexs4XHnDJz4OA0wFVzD/2vRhVGiZVhYfHTzLWqcPy5rkGiRt8AA4Q== Message-ID: <04d92399-72bc-45f6-870c-1dc5c758686f@bootlin.com> Date: Mon, 24 Mar 2025 16:14:31 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird From: Louis Chauvet Subject: Re: [PATCH v2 14/59] dyndbg: split _emit_lookup() out of dynamic_emit_prefix() 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> <20250320185238.447458-15-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: gggruggvucftvghtrhhoucdtuddrgeefvddrtddtgdduiedtuddtucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecuifetpfffkfdpucggtfgfnhhsuhgsshgtrhhisggvnecuuegrihhlohhuthemuceftddunecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenucfjughrpefkffggfgfhuffvvehfjggtgfesthekredttddvjeenucfhrhhomhepnfhouhhishcuvehhrghuvhgvthcuoehlohhuihhsrdgthhgruhhvvghtsegsohhothhlihhnrdgtohhmqeenucggtffrrghtthgvrhhnpeetfffhtdeigfehffduuedvkeefgfdvuddugfffteetffdvteffgfejvedugffgffenucffohhmrghinhepsghoohhtlhhinhdrtghomhenucfkphepledtrdekledrudeifedruddvjeenucevlhhushhtvghrufhiiigvpedtnecurfgrrhgrmhepihhnvghtpeeltddrkeelrdduieefrdduvdejpdhhvghloheplgduledvrdduieekrddtrddvtdgnpdhmrghilhhfrhhomheplhhouhhishdrtghhrghuvhgvthessghoohhtlhhinhdrtghomhdpnhgspghrtghpthhtohepudegpdhrtghpthhtohepjhhimhdrtghrohhmihgvsehgmhgrihhlrdgtohhmpdhrtghpthhtoheplhhinhhugidqkhgvrhhnvghlsehvghgvrhdrkhgvrhhnvghlrdhorhhgpdhrtghpthhtohepughrihdquggvvhgvlheslhhishhtshdrfhhrvggvuggvshhkthhophdrohhrghdprhgtphhtthhopegrmhguqdhgfhigsehlihhsthhsr 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 : > Split dynamic_emit_prefix() to separate out _INCL_LOOKUPs: > > 1. keep dynamic_emit_prefix() static inline > check _INCL_ANY flags before calling 2 > > 2. __dynamic_emit_prefix() > prints [TID] or and trailing space if +t flag > check _INCL_LOOKUP flags before calling 3 > > 3. __dynamic_emit_lookup() > prints ONLY module, function, src, line, and trailing space > TID isn't "callsite" specific info. > result is "cacheable" > > Notes: > > 2,3 are gated, only called when theyve something to emit, so they just > add trailing space. This obsoletes the pos_after_tid var and logic. > > __dynamic_emit_lookup() adds line too, so the result is "whole". > While this would enlarge a naive cache vs add-line-after-caching, we > dont even have a naive one yet. > > And some clever indexing on store() might be able to fold the flags > setting in, such that the prefix stored with +mf flags only (-l), > could be returned for all pr_debugs in that function which also had > +mf flags. While still supporting +mfsl prefixes (with cache > expansion) as they're used. Like the previous patch: I think this should be a separate series. > Signed-off-by: Jim Cromie > --- > lib/dynamic_debug.c | 40 +++++++++++++++++++++++++--------------- > 1 file changed, 25 insertions(+), 15 deletions(-) > > diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c > index 663c125006d0..f7ec2365ab40 100644 > --- a/lib/dynamic_debug.c > +++ b/lib/dynamic_debug.c > @@ -850,19 +850,8 @@ static int remaining(int wrote) > return 0; > } > > -static char *__dynamic_emit_prefix(const struct _ddebug *desc, char *buf) > +static int __dynamic_emit_lookup(const struct _ddebug *desc, char *buf, int pos) > { > - int pos_after_tid; > - int pos = 0; > - > - if (desc->flags & _DPRINTK_FLAGS_INCL_TID) { > - if (in_interrupt()) > - pos += snprintf(buf + pos, remaining(pos), " "); > - else > - pos += snprintf(buf + pos, remaining(pos), "[%d] ", > - task_pid_vnr(current)); > - } > - pos_after_tid = pos; > if (desc->flags & _DPRINTK_FLAGS_INCL_MODNAME) > pos += snprintf(buf + pos, remaining(pos), "%s:", > desc->modname); > @@ -875,8 +864,29 @@ static char *__dynamic_emit_prefix(const struct _ddebug *desc, char *buf) > if (desc->flags & _DPRINTK_FLAGS_INCL_LINENO) > pos += snprintf(buf + pos, remaining(pos), "%d:", > desc->lineno); > - if (pos - pos_after_tid) > - pos += snprintf(buf + pos, remaining(pos), " "); > + > + /* cuz LOOKUP, we've emitted, so add trailing space if room */ s/cuz/because/ > + if (remaining(pos)) > + buf[pos++] = ' '; > + > + return pos; > +} > + > +static char *__dynamic_emit_prefix(struct _ddebug *desc, char *buf) > +{ > + int pos = 0; > + > + if (desc->flags & _DPRINTK_FLAGS_INCL_TID) { > + if (in_interrupt()) > + pos += snprintf(buf + pos, remaining(pos), " "); > + else > + pos += snprintf(buf + pos, remaining(pos), "[%d] ", > + task_pid_vnr(current)); > + } > + > + if (unlikely(desc->flags & _DPRINTK_FLAGS_INCL_LOOKUP)) > + pos += __dynamic_emit_lookup(desc, buf, pos); > + > if (pos >= PREFIX_SIZE) > buf[PREFIX_SIZE - 1] = '\0'; > > @@ -885,7 +895,7 @@ static char *__dynamic_emit_prefix(const struct _ddebug *desc, char *buf) > > static inline char *dynamic_emit_prefix(struct _ddebug *desc, char *buf) > { > - if (unlikely(desc->flags & _DPRINTK_FLAGS_INCL_ANY)) > + if (desc->flags & _DPRINTK_FLAGS_INCL_ANY) Why do you remove the unlikely here? > return __dynamic_emit_prefix(desc, buf); > return buf; > } -- Louis Chauvet, Bootlin Embedded Linux and Kernel engineering https://bootlin.com