Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Sat, 17 Mar 2001 01:30:30 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Sat, 17 Mar 2001 01:30:20 -0500 Received: from mail.cis.nctu.edu.tw ([140.113.23.5]:11535 "EHLO mail.cis.nctu.edu.tw") by vger.kernel.org with ESMTP id ; Sat, 17 Mar 2001 01:30:11 -0500 Message-ID: <003301c0aeac$517b31d0$ae58718c@cis.nctu.edu.tw> Reply-To: "gis88530" From: "gis88530" To: Subject: measurement Date: Sat, 17 Mar 2001 14:34:27 +0800 MIME-Version: 1.0 Content-Type: text/plain; charset="big5" Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.00.2919.6700 X-MimeOLE: Produced By Microsoft MimeOLE V5.00.2919.6700 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hello, I use PSCHED_GET_TIME(stamp) to measure the delay of some kernel function. function_name( ) { int psched_clock_scale; psched_time_t stamp1, stamp2; psched_tdiff_t delay; PSCHED_GET_TIME(stamp1); PSCHED_GET_TIME(stamp2); delay=PSCHED_TDIFF(stamp2, stamp1); printk(KERN_INFO "[%ld], [%ld], [%ld]\n", stamp1, stamp2, delay); } But the result like this [135967], [0], [135967]. I really don't know why stamp2 is 0, and I can't find out the scale of stamp1/stamp2. (micro-second ?? ) Thanks. Cheers, Steven - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/