From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758522Ab3KHXKo (ORCPT ); Fri, 8 Nov 2013 18:10:44 -0500 Received: from terminus.zytor.com ([198.137.202.10]:36716 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758455Ab3KHXKg (ORCPT ); Fri, 8 Nov 2013 18:10:36 -0500 Date: Fri, 8 Nov 2013 15:10:24 -0800 From: tip-bot for Seiji Aguchi Message-ID: Cc: linux-kernel@vger.kernel.org, hpa@zytor.com, mingo@kernel.org, seiji.aguchi@hds.com, tglx@linutronix.de, hpa@linux.intel.com Reply-To: mingo@kernel.org, hpa@zytor.com, linux-kernel@vger.kernel.org, seiji.aguchi@hds.com, tglx@linutronix.de, hpa@linux.intel.com In-Reply-To: <52716E67.6090705@hds.com> References: <52716E67.6090705@hds.com> To: linux-tip-commits@vger.kernel.org Subject: [tip:x86/trace] x86, trace: Add page fault tracepoints Git-Commit-ID: d34603b07c4255b2b00a546d34f297ccd50ae4c6 X-Mailer: tip-git-log-daemon Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.1 (terminus.zytor.com [127.0.0.1]); Fri, 08 Nov 2013 15:10:30 -0800 (PST) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit-ID: d34603b07c4255b2b00a546d34f297ccd50ae4c6 Gitweb: http://git.kernel.org/tip/d34603b07c4255b2b00a546d34f297ccd50ae4c6 Author: Seiji Aguchi AuthorDate: Wed, 30 Oct 2013 16:39:03 -0400 Committer: H. Peter Anvin CommitDate: Fri, 8 Nov 2013 14:15:49 -0800 x86, trace: Add page fault tracepoints This patch introduces page fault tracepoints to x86 architecture by switching IDT. Two events, for user and kernel spaces, are introduced at the beginning of page fault handler for tracing. - User space event There is a request of page fault event for user space as below. https://lkml.kernel.org/r/1368079520-11015-2-git-send-email-fdeslaur+()+gmail+!+com https://lkml.kernel.org/r/1368079520-11015-1-git-send-email-fdeslaur+()+gmail+!+com - Kernel space event: When we measure an overhead in kernel space for investigating performance issues, we can check if it comes from the page fault events. Signed-off-by: Seiji Aguchi Link: http://lkml.kernel.org/r/52716E67.6090705@hds.com Signed-off-by: H. Peter Anvin --- arch/x86/include/asm/trace/exceptions.h | 52 +++++++++++++++++++++++++++++++++ arch/x86/mm/Makefile | 2 ++ arch/x86/mm/fault.c | 13 +++++++++ 3 files changed, 67 insertions(+) diff --git a/arch/x86/include/asm/trace/exceptions.h b/arch/x86/include/asm/trace/exceptions.h new file mode 100644 index 0000000..86540c0 --- /dev/null +++ b/arch/x86/include/asm/trace/exceptions.h @@ -0,0 +1,52 @@ +#undef TRACE_SYSTEM +#define TRACE_SYSTEM exceptions + +#if !defined(_TRACE_PAGE_FAULT_H) || defined(TRACE_HEADER_MULTI_READ) +#define _TRACE_PAGE_FAULT_H + +#include + +extern void trace_irq_vector_regfunc(void); +extern void trace_irq_vector_unregfunc(void); + +DECLARE_EVENT_CLASS(x86_exceptions, + + TP_PROTO(unsigned long address, struct pt_regs *regs, + unsigned long error_code), + + TP_ARGS(address, regs, error_code), + + TP_STRUCT__entry( + __field( unsigned long, address ) + __field( unsigned long, ip ) + __field( unsigned long, error_code ) + ), + + TP_fast_assign( + __entry->address = address; + __entry->ip = regs->ip; + __entry->error_code = error_code; + ), + + TP_printk("address=%pf ip=%pf error_code=0x%lx", + (void *)__entry->address, (void *)__entry->ip, + __entry->error_code) ); + +#define DEFINE_PAGE_FAULT_EVENT(name) \ +DEFINE_EVENT_FN(x86_exceptions, name, \ + TP_PROTO(unsigned long address, struct pt_regs *regs, \ + unsigned long error_code), \ + TP_ARGS(address, regs, error_code), \ + trace_irq_vector_regfunc, \ + trace_irq_vector_unregfunc); + +DEFINE_PAGE_FAULT_EVENT(user_page_fault); +DEFINE_PAGE_FAULT_EVENT(kernel_page_fault); + +#undef TRACE_INCLUDE_PATH +#define TRACE_INCLUDE_PATH . +#define TRACE_INCLUDE_FILE exceptions +#endif /* _TRACE_PAGE_FAULT_H */ + +/* This part must be outside protection */ +#include diff --git a/arch/x86/mm/Makefile b/arch/x86/mm/Makefile index 23d8e5f..6a19ad9 100644 --- a/arch/x86/mm/Makefile +++ b/arch/x86/mm/Makefile @@ -6,6 +6,8 @@ nostackp := $(call cc-option, -fno-stack-protector) CFLAGS_physaddr.o := $(nostackp) CFLAGS_setup_nx.o := $(nostackp) +CFLAGS_fault.o := -I$(src)/../include/asm/trace + obj-$(CONFIG_X86_PAT) += pat_rbtree.o obj-$(CONFIG_SMP) += tlb.o diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c index fd3e281..f2730cbc 100644 --- a/arch/x86/mm/fault.c +++ b/arch/x86/mm/fault.c @@ -20,6 +20,9 @@ #include /* kmemcheck_*(), ... */ #include /* VSYSCALL_START */ +#define CREATE_TRACE_POINTS +#include + /* * Page fault error code bits: * @@ -1232,12 +1235,22 @@ do_page_fault(struct pt_regs *regs, unsigned long error_code) exception_exit(prev_state); } +static void trace_page_fault_entries(struct pt_regs *regs, + unsigned long error_code) +{ + if (user_mode(regs)) + trace_user_page_fault(read_cr2(), regs, error_code); + else + trace_kernel_page_fault(read_cr2(), regs, error_code); +} + dotraplinkage void __kprobes trace_do_page_fault(struct pt_regs *regs, unsigned long error_code) { enum ctx_state prev_state; prev_state = exception_enter(); + trace_page_fault_entries(regs, error_code); __do_page_fault(regs, error_code); exception_exit(prev_state); }