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 X-Spam-Level: X-Spam-Status: No, score=-9.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS,T_DKIMWL_WL_HIGH,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7BED0C4321A for ; Tue, 11 Jun 2019 19:04:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 548AC2183E for ; Tue, 11 Jun 2019 19:04:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1560279869; bh=cWC9WCKFBYymiaKR3AELIx9hhdgcgSHePxydWkn6sFA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=rKQgoiKM3Ez+L9PUxEgqJUSQBaCMvlhzXRQJ1wI1pGv4RY66xQtd9MZ63VzIAHNpZ XJVCGtaBup+loZWnUL9IebG/QlS+2iI2JSnUqXMujJfxePCJB6LvYogv18t1NxXPNr Y2yRtkNr44E3o0Yz1nfj98UhrvwQpkEb/D/56RXk= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2407286AbfFKTE2 (ORCPT ); Tue, 11 Jun 2019 15:04:28 -0400 Received: from mail.kernel.org ([198.145.29.99]:40658 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2405412AbfFKTE0 (ORCPT ); Tue, 11 Jun 2019 15:04:26 -0400 Received: from quaco.ghostprotocols.net (unknown [179.97.35.11]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 97619217D6; Tue, 11 Jun 2019 19:04:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1560279865; bh=cWC9WCKFBYymiaKR3AELIx9hhdgcgSHePxydWkn6sFA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=M8ZuWSEZEJxn3Mve4rtB66btPCn4pIvEMz9/LN7MlfN1pHbhGz/rgMd+gjbQVCIcK Z5N+SnmagnWLoEqJmqZDzGk4rVkU5WzQM0K3dZq2npbh83Fu8sR0hU7GC69GqoYKT8 cwpxWSK5sT90kfy6x2JlicWKpcpU+Nz15mXFW7ms= From: Arnaldo Carvalho de Melo To: Ingo Molnar , Thomas Gleixner Cc: Jiri Olsa , Namhyung Kim , Clark Williams , linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, Adrian Hunter , Jin Yao , Jiri Olsa , Arnaldo Carvalho de Melo Subject: [PATCH 72/85] perf intel-pt: Add support for lookahead Date: Tue, 11 Jun 2019 15:58:58 -0300 Message-Id: <20190611185911.11645-73-acme@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190611185911.11645-1-acme@kernel.org> References: <20190611185911.11645-1-acme@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Adrian Hunter Implement the lookahead callback to let the decoder access subsequent buffers. intel_pt_lookahead() manages the buffer lifetime and calls the decoder for each buffer until the decoder returns a non-zero value. Signed-off-by: Adrian Hunter Cc: Jin Yao Cc: Jiri Olsa Link: http://lkml.kernel.org/r/20190604130017.31207-11-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/intel-pt.c | 59 +++++++++++++++++++++++++++++++++++++- 1 file changed, 58 insertions(+), 1 deletion(-) diff --git a/tools/perf/util/intel-pt.c b/tools/perf/util/intel-pt.c index 4a61c73c9711..3e3a01318b76 100644 --- a/tools/perf/util/intel-pt.c +++ b/tools/perf/util/intel-pt.c @@ -278,7 +278,63 @@ static int intel_pt_get_buffer(struct intel_pt_queue *ptq, return 0; } -/* This function assumes data is processed sequentially only */ +/* Do not drop buffers with references - refer intel_pt_get_trace() */ +static void intel_pt_lookahead_drop_buffer(struct intel_pt_queue *ptq, + struct auxtrace_buffer *buffer) +{ + if (!buffer || buffer == ptq->buffer || buffer == ptq->old_buffer) + return; + + auxtrace_buffer__drop_data(buffer); +} + +/* Must be serialized with respect to intel_pt_get_trace() */ +static int intel_pt_lookahead(void *data, intel_pt_lookahead_cb_t cb, + void *cb_data) +{ + struct intel_pt_queue *ptq = data; + struct auxtrace_buffer *buffer = ptq->buffer; + struct auxtrace_buffer *old_buffer = ptq->old_buffer; + struct auxtrace_queue *queue; + int err = 0; + + queue = &ptq->pt->queues.queue_array[ptq->queue_nr]; + + while (1) { + struct intel_pt_buffer b = { .len = 0 }; + + buffer = auxtrace_buffer__next(queue, buffer); + if (!buffer) + break; + + err = intel_pt_get_buffer(ptq, buffer, old_buffer, &b); + if (err) + break; + + if (b.len) { + intel_pt_lookahead_drop_buffer(ptq, old_buffer); + old_buffer = buffer; + } else { + intel_pt_lookahead_drop_buffer(ptq, buffer); + continue; + } + + err = cb(&b, cb_data); + if (err) + break; + } + + if (buffer != old_buffer) + intel_pt_lookahead_drop_buffer(ptq, buffer); + intel_pt_lookahead_drop_buffer(ptq, old_buffer); + + return err; +} + +/* + * This function assumes data is processed sequentially only. + * Must be serialized with respect to intel_pt_lookahead() + */ static int intel_pt_get_trace(struct intel_pt_buffer *b, void *data) { struct intel_pt_queue *ptq = data; @@ -827,6 +883,7 @@ static struct intel_pt_queue *intel_pt_alloc_queue(struct intel_pt *pt, params.get_trace = intel_pt_get_trace; params.walk_insn = intel_pt_walk_next_insn; + params.lookahead = intel_pt_lookahead; params.data = ptq; params.return_compression = intel_pt_return_compression(pt); params.branch_enable = intel_pt_branch_enable(pt); -- 2.20.1