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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 68E5AC433F5 for ; Wed, 23 Mar 2022 15:23:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S245089AbiCWPYr (ORCPT ); Wed, 23 Mar 2022 11:24:47 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42602 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235842AbiCWPYo (ORCPT ); Wed, 23 Mar 2022 11:24:44 -0400 Received: from mailgw02.mediatek.com (unknown [210.61.82.184]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 345BE6342 for ; Wed, 23 Mar 2022 08:23:10 -0700 (PDT) X-UUID: 38722221b37c4a6eada6b2905f3b3e2c-20220323 X-UUID: 38722221b37c4a6eada6b2905f3b3e2c-20220323 Received: from mtkmbs10n2.mediatek.inc [(172.21.101.183)] by mailgw02.mediatek.com (envelope-from ) (Generic MTA with TLSv1.2 ECDHE-RSA-AES256-GCM-SHA384 256/256) with ESMTP id 1176745413; Wed, 23 Mar 2022 23:23:01 +0800 Received: from mtkcas10.mediatek.inc (172.21.101.39) by mtkmbs07n1.mediatek.inc (172.21.101.16) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Wed, 23 Mar 2022 23:23:00 +0800 Received: from mtksdccf07.mediatek.inc (172.21.84.99) by mtkcas10.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Wed, 23 Mar 2022 23:22:59 +0800 From: Mark-PK Tsai To: , CC: , , , , , Subject: [PATCH v3 0/2] tracing: make tracer_init_tracefs initcall asynchronous Date: Wed, 23 Mar 2022 23:22:55 +0800 Message-ID: <20220323152257.7871-1-mark-pk.tsai@mediatek.com> X-Mailer: git-send-email 2.18.0 MIME-Version: 1.0 Content-Type: text/plain X-MTK: N Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Move trace_eval_init() to subsys_initcall to make it start earlier. And to avoid tracer_init_tracefs being blocked by trace_event_sem which trace_eval_init() hold [1], queue tracer_init_tracefs() to eval_map_wq to let the two works being executed sequentially. It can speed up the initialization of kernel as result of making tracer_init_tracefs asynchronous. On my arm64 platform, it reduce ~20ms of 125ms which total time do_initcalls spend. Mark-PK Tsai (2): tracing: Avoid adding tracer option before update_tracer_options tracing: make tracer_init_tracefs initcall asynchronous kernel/trace/trace.c | 38 ++++++++++++++++++++++++++++---------- 1 file changed, 28 insertions(+), 10 deletions(-) -- 2.18.0