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Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1n8L38-008yiB-R4; Fri, 14 Jan 2022 11:47:19 +0000 Received: from smtp2.axis.com ([195.60.68.18]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1n8L2n-008yao-Gh for linux-arm-kernel@lists.infradead.org; Fri, 14 Jan 2022 11:46:59 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=axis.com; q=dns/txt; s=axis-central1; t=1642160817; x=1673696817; h=date:from:to:cc:subject:message-id:references: mime-version:in-reply-to; bh=AMs+u9nkmpDZ5lxA/fLhYjA5QxFXQFce1TTDfia+q9o=; b=IPUmj0AjZhJP73mn1n0vOdHGLGw9gNkPNl35QmVKLYBsC9qnRYEl5Wt4 sQHPQ34xPotmVCiEdSUbMJtPbtE2YhGBN10VNsqNeEkSO3cqs+nk1yEeE /kMWNloVXwzSi2MELLEBU7F3MmyLH5HrAei9R7uK+gP/yCoMbrvtTfUcr d9uHFfgdhGLGPTmC9PoIEiTyS9B+sfepg6XmAAoY73T4Zmgre0F8kB9zQ HH+adS2vKrFnHwyaM6TYZVnkA6PkaWghz4ZIyrjAzuxkIc0nuQRPSdHr8 FQgHRA0JXYKHhCIfzeaXbvMVN+XWJhyGg1DCxXFzmo2L7FVj7/m2hH4FC g==; Date: Fri, 14 Jan 2022 12:46:54 +0100 From: Vincent Whitchurch To: Jim Cromie CC: "jbaron@akamai.com" , "gregkh@linuxfoundation.org" , "linux@rasmusvillemoes.dk" , "rostedt@goodmis.org" , "mathieu.desnoyers@efficios.com" , "daniel.vetter@ffwll.ch" , "seanpaul@chromium.org" , "robdclark@gmail.com" , "dri-devel@lists.freedesktop.org" , "amd-gfx@lists.freedesktop.org" , "intel-gvt-dev@lists.freedesktop.org" , "intel-gfx@lists.freedesktop.org" , "linux-kernel@vger.kernel.org" , "quic_saipraka@quicinc.com" , "will@kernel.org" , "catalin.marinas@arm.com" , "quic_psodagud@quicinc.com" , "maz@kernel.org" , "arnd@arndb.de" , "linux-arm-kernel@lists.infradead.org" , "linux-arm-msm@vger.kernel.org" , "mingo@redhat.com" Subject: Re: [PATCH v11 03/19] dyndbg: add write-to-tracefs code Message-ID: <20220114114654.GA23983@axis.com> References: <20220107052942.1349447-1-jim.cromie@gmail.com> <20220107052942.1349447-4-jim.cromie@gmail.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20220107052942.1349447-4-jim.cromie@gmail.com> User-Agent: Mutt/1.10.1 (2018-07-13) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220114_034657_997961_DBCEEA70 X-CRM114-Status: GOOD ( 22.67 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, Jan 07, 2022 at 06:29:26AM +0100, Jim Cromie wrote: > adds: dynamic_trace() > uses trace_console() temporarily to issue printk:console event > uses internal-ish __ftrace_trace_stack code: > 4-context buffer stack, barriers per Steve > > call it from new funcs: > dynamic_printk() - print to both syslog/tracefs > dynamic_dev_printk() - dev-print to both syslog/tracefs > > These handle both _DPRINTK_FLAGS_PRINTK and _DPRINTK_FLAGS_TRACE > cases, allowing to vsnprintf the message once and use it for both, > skipping past the KERN_DEBUG character for tracing. > > Finally, adjust the callers: __dynamic_{pr_debug,{,net,ib}dev_dbg}, > replacing printk and dev_printk with the new funcs above. > > The _DPRINTK_FLAGS_TRACE flag character s 'T', so the following finds > all callsites enabled for tracing: > > grep -P =p?T /proc/dynamic_debug/control > > Enabling debug-to-tracefs is 2 steps: > > # event enable > echo 1 > /sys/kernel/tracing/events/dyndbg/enable > # callsite enable > echo module foo +T > /proc/dynamic_debug/control > > This patch,~1,~2 are based upon: > https://lore.kernel.org/lkml/20200825153338.17061-1-vincent.whitchurch@axis.com/ > > .. with simplification of temporarily reusing trace_console() rather > than adding a new printk:dyndbg event. Soon, add 2 new events > capturing the pr_debug & dev_dbg() args. The example above does not match the code in this patch since the dyndbg:* events are only added in a later patch. Perhaps you could reorder this patch stack so that you don't use trace_console() in this patch just to replace it with the new events in the next patch? > > CC: vincent.whitchurch@axis.com > Signed-off-by: Jim Cromie > --- > .../admin-guide/dynamic-debug-howto.rst | 1 + > lib/dynamic_debug.c | 155 +++++++++++++++--- > 2 files changed, 130 insertions(+), 26 deletions(-) > > diff --git a/Documentation/admin-guide/dynamic-debug-howto.rst b/Documentation/admin-guide/dynamic-debug-howto.rst [...] > @@ -723,29 +822,33 @@ void __dynamic_ibdev_dbg(struct _ddebug *descriptor, > { > struct va_format vaf; > va_list args; > + unsigned int flags; > > va_start(args, fmt); > > vaf.fmt = fmt; > vaf.va = &args; > + flags = descriptor->flags; > > if (ibdev && ibdev->dev.parent) { > char buf[PREFIX_SIZE] = ""; > > - dev_printk_emit(LOGLEVEL_DEBUG, ibdev->dev.parent, > - "%s%s %s %s: %pV", > - dynamic_emit_prefix(descriptor, buf), > - dev_driver_string(ibdev->dev.parent), > - dev_name(ibdev->dev.parent), > - dev_name(&ibdev->dev), > - &vaf); > + dynamic_dev_printk(flags, ibdev->dev.parent, > + "%s%s %s %s: %pV", > + dynamic_emit_prefix(descriptor, buf), > + dev_driver_string(ibdev->dev.parent), > + dev_name(ibdev->dev.parent), > + dev_name(&ibdev->dev), > + &vaf); > } else if (ibdev) { > - printk(KERN_DEBUG "%s: %pV", dev_name(&ibdev->dev), &vaf); > + dynamic_printk(flags, KERN_DEBUG "%s%s: %pV", > + dev_name(&ibdev->dev), &vaf); > } else { > - printk(KERN_DEBUG "(NULL ib_device): %pV", &vaf); > + dynamic_printk(flags, KERN_DEBUG "(NULL ip_device): %pV", > + &vaf); > } > > - va_end(args); > +va_end(args); This looks like an unintentional whitespace change? _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel