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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 A6A8FCA0FED for ; Tue, 9 Sep 2025 21:47:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:MIME-Version:References:In-Reply-To:Message-ID:Subject:Cc:To: From:Date:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=vB94mPddW4cgqmg6+HeYmIAiKVTW0/CQoLSLEX8gs+I=; b=fP4C+Zv9Pg0Kc5rVd9C40XOOA7 r/SCjGxYLdLI6QI/1bdoJV9e5hA/gfXbpHDD8495R8HucxVJzR50RjDvAp7IH0iKglgaryfwH8fIA SSxVjQRNe6KqZHAS3isa9kK7QIc8Fn/S7O1YNfBv8KybiCEOaaR05jDzHxNJqwAGKcoKlp2+1aMlZ Y2prb0+/pBqDksIoedFT/xivzTkv/8QY90Xw5CmYc0Er9ckHPAvkesD0qmc3SBLVUBLzG425TG4BF IL97i/AD2VSJIaODPinMeO8hMsRn2doa5QaXBDRcUda+ZZvOIyRK+fk37FAohmMNKNCktG6ltVyLk wFxh/OZg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1uw6BE-0000000AUIJ-1hJy; Tue, 09 Sep 2025 21:47:12 +0000 Received: from smtprelay0013.hostedemail.com ([216.40.44.13] helo=relay.hostedemail.com) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1uw6BB-0000000AUH7-34BM for linux-arm-kernel@lists.infradead.org; Tue, 09 Sep 2025 21:47:11 +0000 Received: from omf18.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay08.hostedemail.com (Postfix) with ESMTP id 8E31F140119; Tue, 9 Sep 2025 21:47:06 +0000 (UTC) Received: from [HIDDEN] (Authenticated sender: rostedt@goodmis.org) by omf18.hostedemail.com (Postfix) with ESMTPA id F1A102F; Tue, 9 Sep 2025 21:47:02 +0000 (UTC) Date: Tue, 9 Sep 2025 17:47:50 -0400 From: Steven Rostedt To: Vincent Donnefort Cc: mhiramat@kernel.org, mathieu.desnoyers@efficios.com, linux-trace-kernel@vger.kernel.org, maz@kernel.org, oliver.upton@linux.dev, joey.gouly@arm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com, kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, jstultz@google.com, qperret@google.com, will@kernel.org, aneesh.kumar@kernel.org, kernel-team@android.com, linux-kernel@vger.kernel.org Subject: Re: [PATCH v6 06/24] tracing: Add events to trace remotes Message-ID: <20250909174750.72be9bbc@gandalf.local.home> In-Reply-To: <20250821081412.1008261-7-vdonnefort@google.com> References: <20250821081412.1008261-1-vdonnefort@google.com> <20250821081412.1008261-7-vdonnefort@google.com> X-Mailer: Claws Mail 3.20.0git84 (GTK+ 2.24.33; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Stat-Signature: 7ej5srhi7m6dgtzrcpzb7hsqh8cx9fhr X-Rspamd-Server: rspamout01 X-Rspamd-Queue-Id: F1A102F X-Session-Marker: 726F737465647440676F6F646D69732E6F7267 X-Session-ID: U2FsdGVkX1+a22/GqU1qf8xhKUjNZ3RQSMe8o75J0/I= X-HE-Tag: 1757454422-816481 X-HE-Meta: U2FsdGVkX1+MvwcffwkTYY4ptHTCjtVWAhsGAZBNw+vbcSDhGOmJ57KfO9RcRgJyDZ7EMrHLo//as4KF2ZC7464Edt85xLb32cnKLFN690CNFKswW4Bz3sjDMJN1RrqzpF7mk143fnM1ZtLJSfThUbqWXcvj3Zg1Lu9AxVbp41YNt6DG5haSE/V1tiaKAj/2e0X+WCTO9Lf0X6lRMxGO8TRxXK/mlnv8xXdxBXd8kCltiEIFf0LsNw5Ycq2HHG8zVEfoFYFr57k1wrlzWpuzmMY7SvwVs+bIvAvytdIqtaLvCHQR1r90l/Clh7yLvQbsvk1lSpG27MYvzlTzDWhENKoRw42PjCZq X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250909_144709_834064_9899D4C1 X-CRM114-Status: GOOD ( 12.79 ) 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: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Thu, 21 Aug 2025 09:13:54 +0100 Vincent Donnefort wrote: > @@ -265,16 +272,19 @@ static struct trace_remote_iterator *trace_remote_iter(struct trace_remote *remo > static bool trace_remote_iter_next(struct trace_remote_iterator *iter) > { > struct trace_buffer *trace_buffer = iter->remote->trace_buffer; > + struct ring_buffer_event *rb_evt; > int cpu = iter->cpu; > > if (cpu != RING_BUFFER_ALL_CPUS) { > if (ring_buffer_empty_cpu(trace_buffer, cpu)) > return false; > > - if (!ring_buffer_peek(trace_buffer, cpu, &iter->ts, &iter->lost_events)) > + rb_evt = ring_buffer_peek(trace_buffer, cpu, &iter->ts, &iter->lost_events); > + if (!rb_evt) > return false; > > iter->evt_cpu = cpu; > + iter->evt = (struct remote_event_hdr *)&rb_evt->array[1]; Hmm, shouldn't this use ring_buffer_event_data(rb_evt) instead? If the events get big, then it would be array[2]. But the ring_buffer_event_data() hides that detail. > return true; > } > > @@ -286,7 +296,8 @@ static bool trace_remote_iter_next(struct trace_remote_iterator *iter) > if (ring_buffer_empty_cpu(trace_buffer, cpu)) > continue; > > - if (!ring_buffer_peek(trace_buffer, cpu, &ts, &lost_events)) > + rb_evt = ring_buffer_peek(trace_buffer, cpu, &ts, &lost_events); Ditto. > + if (!rb_evt) > continue; > > if (ts >= iter->ts) > @@ -294,14 +305,18 @@ static bool trace_remote_iter_next(struct trace_remote_iterator *iter) > > iter->ts = ts; > iter->evt_cpu = cpu; > + iter->evt = (struct remote_event_hdr *)&rb_evt->array[1]; Ditto. -- Steve > iter->lost_events = lost_events; > } > > return iter->ts != U64_MAX; > } > > +static struct remote_event *trace_remote_find_event(struct trace_remote *remote, unsigned short id); > + > static int trace_remote_iter_print(struct trace_remote_iterator *iter) > { > + struct remote_event *evt; > unsigned long usecs_rem; > u64 ts = iter->ts; >