From patchwork Wed Aug 23 08:54:26 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Mads Ynddal X-Patchwork-Id: 13361815 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 lists.gnu.org (lists.gnu.org [209.51.188.17]) (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 05058EE4993 for ; Wed, 23 Aug 2023 08:55:50 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qYjds-0004U8-Kl; Wed, 23 Aug 2023 04:55:08 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qYjdr-0004O4-Au for qemu-devel@nongnu.org; Wed, 23 Aug 2023 04:55:07 -0400 Received: from pv50p00im-tydg10021701.me.com ([17.58.6.54]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qYjdp-000051-AM for qemu-devel@nongnu.org; Wed, 23 Aug 2023 04:55:07 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ynddal.dk; s=sig1; t=1692780903; bh=IU4eVSgFHWDP+jifjfGdkBe+orZ14DeYHyLKEqxQd3o=; h=From:To:Subject:Date:Message-Id:MIME-Version; b=eBFZPj/+QRjOlp0Jdbscy36waqUe5sjFsWU+MmSJ4SzJ9Cv7qPiAhB8x5Oa3I5IcE 2BqeRv5upE57h2tgiF7O1pQF6HUhxaj7ZPE9il1K7pDJoo4zfgOPlUobDQrbnIzww1 ueKxG36/7VPnxmClfCoRVpG7sz7wauQBYoC626fJFF/p1Fu515l6HNmCsa0BJtMC6J OKCjBx1Bop6UlesuLH8BC8uXxowVENPIjkV6atLkrxhJJegTmPoUNrMBiNeX/Tb5gr zgjef10nGQCHzItYSj0Qz194tTorN+WHL3AeE1Nt2Gou7CdPmmF4TRYil4mJBtfj2M B29UZYE3omtdw== Received: from localhost.localdomain (pv50p00im-dlb-asmtp-mailmevip.me.com [17.56.9.10]) by pv50p00im-tydg10021701.me.com (Postfix) with ESMTPSA id 044763A0B91; Wed, 23 Aug 2023 08:55:01 +0000 (UTC) From: Mads Ynddal To: qemu-devel@nongnu.org Cc: John Snow , Mads Ynddal , Stefan Hajnoczi , Cleber Rosa , Mads Ynddal Subject: [PATCH v4 11/14] simpletrace: move event processing to Analyzer class Date: Wed, 23 Aug 2023 10:54:26 +0200 Message-Id: <20230823085429.20519-12-mads@ynddal.dk> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20230823085429.20519-1-mads@ynddal.dk> References: <20230823085429.20519-1-mads@ynddal.dk> MIME-Version: 1.0 X-Proofpoint-ORIG-GUID: guMPptZvj-eM39Vgg2ucavEE4OC-PvId X-Proofpoint-GUID: guMPptZvj-eM39Vgg2ucavEE4OC-PvId X-Proofpoint-Virus-Version: =?utf-8?q?vendor=3Dfsecure_engine=3D1=2E1=2E170-?= =?utf-8?q?22c6f66c430a71ce266a39bfe25bc2903e8d5c8f=3A6=2E0=2E517=2C18=2E0?= =?utf-8?q?=2E883=2C17=2E11=2E64=2E514=2E0000000_definitions=3D2022-06-21=5F?= =?utf-8?q?08=3A2022-06-21=5F01=2C2022-06-21=5F08=2C2022-02-23=5F01_signatur?= =?utf-8?q?es=3D0?= X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 malwarescore=0 spamscore=0 mlxlogscore=999 clxscore=1030 bulkscore=0 adultscore=0 phishscore=0 suspectscore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2212070000 definitions=main-2308230080 Received-SPF: pass client-ip=17.58.6.54; envelope-from=mads@ynddal.dk; helo=pv50p00im-tydg10021701.me.com X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org From: Mads Ynddal Moved event processing to the Analyzer class to separate specific analyzer logic (like caching and function signatures) from the _process function. This allows for new types of Analyzer-based subclasses without changing the core code. Note, that the fn_cache is important for performance in cases where the analyzer is branching away from the catch-all a lot. The cache has no measurable performance penalty. Signed-off-by: Mads Ynddal Reviewed-by: Philippe Mathieu-Daudé Reviewed-by: Stefan Hajnoczi --- scripts/simpletrace.py | 60 +++++++++++++++++++++++++----------------- 1 file changed, 36 insertions(+), 24 deletions(-) diff --git a/scripts/simpletrace.py b/scripts/simpletrace.py index 6969fdd59a..4136d00600 100755 --- a/scripts/simpletrace.py +++ b/scripts/simpletrace.py @@ -169,6 +169,35 @@ def catchall(self, event, rec): """Called if no specific method for processing a trace event has been found.""" pass + def _build_fn(self, event): + fn = getattr(self, event.name, None) + if fn is None: + # Return early to avoid costly call to inspect.getfullargspec + return self.catchall + + event_argcount = len(event.args) + fn_argcount = len(inspect.getfullargspec(fn)[0]) - 1 + if fn_argcount == event_argcount + 1: + # Include timestamp as first argument + return lambda _, rec: fn(*(rec[1:2] + rec[3:3 + event_argcount])) + elif fn_argcount == event_argcount + 2: + # Include timestamp and pid + return lambda _, rec: fn(*rec[1:3 + event_argcount]) + else: + # Just arguments, no timestamp or pid + return lambda _, rec: fn(*rec[3:3 + event_argcount]) + + def _process_event(self, rec_args, *, event, event_id, timestamp_ns, pid, **kwargs): + if not hasattr(self, '_fn_cache'): + # NOTE: Cannot depend on downstream subclasses to have + # super().__init__() because of legacy. + self._fn_cache = {} + + rec = (event_id, timestamp_ns, pid, *rec_args) + if event_id not in self._fn_cache: + self._fn_cache[event_id] = self._build_fn(event) + self._fn_cache[event_id](event, rec) + def end(self): """Called at the end of the trace.""" pass @@ -222,32 +251,15 @@ def _process(events, log_fobj, analyzer, read_header=True): if read_header: read_trace_header(log_fobj) - def build_fn(analyzer, event): - if isinstance(event, str): - return analyzer.catchall - - fn = getattr(analyzer, event.name, None) - if fn is None: - return analyzer.catchall - - event_argcount = len(event.args) - fn_argcount = len(inspect.getfullargspec(fn)[0]) - 1 - if fn_argcount == event_argcount + 1: - # Include timestamp as first argument - return lambda _, rec: fn(*(rec[1:2] + rec[3:3 + event_argcount])) - elif fn_argcount == event_argcount + 2: - # Include timestamp and pid - return lambda _, rec: fn(*rec[1:3 + event_argcount]) - else: - # Just arguments, no timestamp or pid - return lambda _, rec: fn(*rec[3:3 + event_argcount]) - with analyzer: - fn_cache = {} for event, event_id, timestamp_ns, record_pid, *rec_args in read_trace_records(events, log_fobj, read_header): - if event_id not in fn_cache: - fn_cache[event_id] = build_fn(analyzer, event) - fn_cache[event_id](event, (event_id, timestamp_ns, record_pid, *rec_args)) + analyzer._process_event( + rec_args, + event=event, + event_id=event_id, + timestamp_ns=timestamp_ns, + pid=record_pid, + ) def run(analyzer): """Execute an analyzer on a trace file given on the command-line.