From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933218Ab2CZSjf (ORCPT ); Mon, 26 Mar 2012 14:39:35 -0400 Received: from mail-gx0-f202.google.com ([209.85.161.202]:36863 "EHLO mail-gx0-f202.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932830Ab2CZSjd (ORCPT ); Mon, 26 Mar 2012 14:39:33 -0400 From: Vaibhav Nagarnaik To: Steven Rostedt , Frederic Weisbecker , Thomas Gleixner , Ingo Molnar Cc: David Sharp , Justin Teravest , Laurent Chavey , x86@kernel.org, linux-kernel@vger.kernel.org, Vaibhav Nagarnaik Subject: [PATCH 0/6] Enhance and speed up syscall tracing Date: Mon, 26 Mar 2012 11:39:22 -0700 Message-Id: <1332787168-20457-1-git-send-email-vnagarnaik@google.com> X-Mailer: git-send-email 1.7.7.3 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Tracing syscalls in the kernel adds its own complexity. This patchset attempts to simplify the code for syscall tracing and speed it up. It also adds tracing for ia32 compat syscalls. These patches simplify the syscall tracing macros: * trace: syscalls.h - cleanup and simplify SYSCALL_METADATA() * trace: Refactor ftrace syscall macros to make them more readable These patches add tracing support for compat syscalls: * trace: add support for 32 bit compat syscalls on x86_64 * trace: raw_syscalls: Mark compat syscalls in the MSB of the syscall number This patch reduces syscall tracing latency. * trace: trace syscall in its handler not from ptrace handler It changes the way syscall tracing is plumbed. The syscalls tracepoint was earlier called from ptrace handler which added latency to the syscall tracing code path because of manipulation required to the stack. It can be similarly handled by having a little indirection function as the syscall handler and calling the tracepoints just before the actual syscall handler. It decreases latency for all syscall tracepoints. David Sharp (1): trace: raw_syscalls: Mark compat syscalls in the MSB of the syscall number Michael Davidson (3): trace: syscalls.h - cleanup and simplify SYSCALL_METADATA() trace: add support for 32 bit compat syscalls on x86_64 trace: get rid of the enabled_*_syscalls bitmaps Vaibhav Nagarnaik (2): trace: Refactor ftrace syscall macros to make them more readable trace: trace syscall in its handler not from ptrace handler arch/openrisc/include/asm/thread_info.h | 1 - arch/powerpc/Kconfig | 1 - arch/powerpc/include/asm/thread_info.h | 4 +- arch/powerpc/kernel/ptrace.c | 6 - arch/s390/Kconfig | 1 - arch/s390/include/asm/thread_info.h | 2 - arch/s390/kernel/entry.S | 3 +- arch/s390/kernel/entry64.S | 3 +- arch/s390/kernel/ptrace.c | 9 - arch/sh/Kconfig | 1 - arch/sh/include/asm/thread_info.h | 8 +- arch/sh/kernel/ptrace_32.c | 9 - arch/sh/kernel/ptrace_64.c | 9 - arch/sparc/Kconfig | 1 - arch/sparc/include/asm/thread_info_64.h | 2 - arch/sparc/kernel/ptrace_64.c | 9 - arch/sparc/kernel/syscalls.S | 10 +- arch/x86/Kconfig | 1 - arch/x86/ia32/Makefile | 2 + arch/x86/ia32/ia32_syscall_metadata.c | 443 +++++++++++++++++++++++++++++++ arch/x86/include/asm/thread_info.h | 10 +- arch/x86/kernel/ptrace.c | 9 - fs/dcookies.c | 2 +- fs/open.c | 2 +- fs/read_write.c | 8 +- fs/sync.c | 8 +- include/linux/syscalls.h | 153 +++++++---- include/trace/events/syscalls.h | 38 ++-- include/trace/syscall.h | 18 ++- kernel/trace/Kconfig | 12 +- kernel/trace/trace_syscalls.c | 153 +++++------ kernel/tracepoint.c | 38 --- mm/fadvise.c | 5 +- mm/filemap.c | 2 +- 34 files changed, 681 insertions(+), 302 deletions(-) create mode 100644 arch/x86/ia32/ia32_syscall_metadata.c -- 1.7.7.3