Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756231Ab0G3J7J (ORCPT ); Fri, 30 Jul 2010 05:59:09 -0400 Received: from mail4-relais-sop.national.inria.fr ([192.134.164.105]:64232 "EHLO mail4-relais-sop.national.inria.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753090Ab0G3J7G (ORCPT ); Fri, 30 Jul 2010 05:59:06 -0400 X-IronPort-AV: E=Sophos;i="4.55,286,1278280800"; d="scan'208";a="67126251" From: Tomasz Buchert To: linux-kernel@vger.kernel.org, Daniel Walker , Stanislaw Gruszka , Peter Zijlstra Cc: Tomasz Buchert Subject: [PATCH 0/4] Wall time clocks + change in access rules Date: Fri, 30 Jul 2010 11:57:43 +0200 Message-Id: <1280483867-6387-1-git-send-email-tomasz.buchert@inria.fr> X-Mailer: git-send-email 1.6.3.3 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2098 Lines: 46 My another attempt to get my patches reviewed. For the convenience of a prospective reviewer I've written a set of tests for this kernel change. One may get them using: git clone http://pentium.hopto.org/~thinred/repos/clock-test.git During our work we encountered a problem of obtaining a reliable and fine-grained measurements of CPU time/wall time of a process/thread. The existing methods (taskstats, procfs, POSIX CPU clocks) have either unfriendly interface (taskstats) or give unsatisfactory precision (procfs). However, even the most precise and clean interface, POSIX CPU clocks, is limited only to threads in the same thread group. The following patches introduce three changes: * new per process/thread wall time clocks -- CLOCK_PROCESS_WALLTIME_ID and CLOCK_THREAD_WALLTIME_ID; one can also access wall time of a process/thread using clocks constructed from macros in posix-timers.h * less restricted access to CPU and wall clocks -- user can access them for all their threads * minor refactoring/renaming to reflect the changes. Tomasz Buchert (4): posix-timers: Refactoring of CPUCLOCK* macros posix-cpu-timers: Introduction of wall clocks posix-cpu-timers: Wider access to the thread clocks posix-cpu-timers: posix-cpu-timers.c renamed to posix-task-timers.c include/linux/posix-timers.h | 52 +- include/linux/sched.h | 2 +- include/linux/time.h | 2 + kernel/Makefile | 2 +- kernel/itimer.c | 14 +- kernel/posix-cpu-timers.c | 1642 ------------------------------------- kernel/posix-task-timers.c | 1852 ++++++++++++++++++++++++++++++++++++++++++ kernel/posix-timers.c | 25 +- 8 files changed, 1924 insertions(+), 1667 deletions(-) delete mode 100644 kernel/posix-cpu-timers.c create mode 100644 kernel/posix-task-timers.c -- 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/