From: Frederic Weisbecker <fweisbec@gmail.com>
To: Ingo Molnar <mingo@kernel.org>, Thomas Gleixner <tglx@linutronix.de>
Cc: LKML <linux-kernel@vger.kernel.org>,
Frederic Weisbecker <fweisbec@gmail.com>,
Alessio Igor Bogani <abogani@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Avi Kivity <avi@redhat.com>, Chris Metcalf <cmetcalf@tilera.com>,
Christoph Lameter <cl@linux.com>,
Daniel Lezcano <daniel.lezcano@linaro.org>,
Geoff Levand <geoff@infradead.org>,
Gilad Ben Yossef <gilad@benyossef.com>,
Hakan Akkan <hakanakkan@gmail.com>, Kevin Hilman <khilman@ti.com>,
Max Krasnyansky <maxk@qualcomm.com>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
Peter Zijlstra <peterz@infradead.org>,
Stephen Hemminger <shemminger@vyatta.com>,
Steven Rostedt <rostedt@goodmis.org>,
Sven-Thorsten Dietrich <thebigcorporation@gmail.com>
Subject: [PATCH 5/7] x86: Syscall hooks for adaptive nohz mode
Date: Wed, 13 Jun 2012 18:19:55 +0200 [thread overview]
Message-ID: <1339604397-8758-6-git-send-email-fweisbec@gmail.com> (raw)
In-Reply-To: <1339604397-8758-1-git-send-email-fweisbec@gmail.com>
Add syscall hooks to notify syscall entry and exit on
CPUs running in full adative nohz mode. This way we
can account the cputime elapsed in kernel boundaries.
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Alessio Igor Bogani <abogani@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Avi Kivity <avi@redhat.com>
Cc: Chris Metcalf <cmetcalf@tilera.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: Geoff Levand <geoff@infradead.org>
Cc: Gilad Ben Yossef <gilad@benyossef.com>
Cc: Hakan Akkan <hakanakkan@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Kevin Hilman <khilman@ti.com>
Cc: Max Krasnyansky <maxk@qualcomm.com>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephen Hemminger <shemminger@vyatta.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Sven-Thorsten Dietrich <thebigcorporation@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
---
arch/x86/include/asm/thread_info.h | 10 +++++++---
arch/x86/kernel/ptrace.c | 5 +++++
2 files changed, 12 insertions(+), 3 deletions(-)
diff --git a/arch/x86/include/asm/thread_info.h b/arch/x86/include/asm/thread_info.h
index 89f794f..c535d84 100644
--- a/arch/x86/include/asm/thread_info.h
+++ b/arch/x86/include/asm/thread_info.h
@@ -89,6 +89,7 @@ struct thread_info {
#define TIF_NOTSC 16 /* TSC is not accessible in userland */
#define TIF_IA32 17 /* IA32 compatibility process */
#define TIF_FORK 18 /* ret_from_fork */
+#define TIF_NOHZ 19 /* in adaptive nohz mode */
#define TIF_MEMDIE 20 /* is terminating due to OOM killer */
#define TIF_DEBUG 21 /* uses debug registers */
#define TIF_IO_BITMAP 22 /* uses I/O bitmap */
@@ -114,6 +115,7 @@ struct thread_info {
#define _TIF_NOTSC (1 << TIF_NOTSC)
#define _TIF_IA32 (1 << TIF_IA32)
#define _TIF_FORK (1 << TIF_FORK)
+#define _TIF_NOHZ (1 << TIF_NOHZ)
#define _TIF_DEBUG (1 << TIF_DEBUG)
#define _TIF_IO_BITMAP (1 << TIF_IO_BITMAP)
#define _TIF_FORCED_TF (1 << TIF_FORCED_TF)
@@ -126,12 +128,13 @@ struct thread_info {
/* work to do in syscall_trace_enter() */
#define _TIF_WORK_SYSCALL_ENTRY \
(_TIF_SYSCALL_TRACE | _TIF_SYSCALL_EMU | _TIF_SYSCALL_AUDIT | \
- _TIF_SECCOMP | _TIF_SINGLESTEP | _TIF_SYSCALL_TRACEPOINT)
+ _TIF_SECCOMP | _TIF_SINGLESTEP | _TIF_SYSCALL_TRACEPOINT | \
+ _TIF_NOHZ)
/* work to do in syscall_trace_leave() */
#define _TIF_WORK_SYSCALL_EXIT \
(_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | _TIF_SINGLESTEP | \
- _TIF_SYSCALL_TRACEPOINT)
+ _TIF_SYSCALL_TRACEPOINT | _TIF_NOHZ)
/* work to do on interrupt/exception return */
#define _TIF_WORK_MASK \
@@ -141,7 +144,8 @@ struct thread_info {
/* work to do on any return to user space */
#define _TIF_ALLWORK_MASK \
- ((0x0000FFFF & ~_TIF_SECCOMP) | _TIF_SYSCALL_TRACEPOINT)
+ ((0x0000FFFF & ~_TIF_SECCOMP) | _TIF_SYSCALL_TRACEPOINT | \
+ _TIF_NOHZ)
/* Only used for 64 bit */
#define _TIF_DO_NOTIFY_MASK \
diff --git a/arch/x86/kernel/ptrace.c b/arch/x86/kernel/ptrace.c
index c4c6a5c..e9dfd40 100644
--- a/arch/x86/kernel/ptrace.c
+++ b/arch/x86/kernel/ptrace.c
@@ -21,6 +21,7 @@
#include <linux/signal.h>
#include <linux/perf_event.h>
#include <linux/hw_breakpoint.h>
+#include <linux/tick.h>
#include <asm/uaccess.h>
#include <asm/pgtable.h>
@@ -1463,6 +1464,8 @@ long syscall_trace_enter(struct pt_regs *regs)
{
long ret = 0;
+ tick_nohz_enter_kernel();
+
/*
* If we stepped into a sysenter/syscall insn, it trapped in
* kernel mode; do_debug() cleared TF and set TIF_SINGLESTEP.
@@ -1526,4 +1529,6 @@ void syscall_trace_leave(struct pt_regs *regs)
!test_thread_flag(TIF_SYSCALL_EMU);
if (step || test_thread_flag(TIF_SYSCALL_TRACE))
tracehook_report_syscall_exit(regs, step);
+
+ tick_nohz_exit_kernel();
}
--
1.7.5.4
next prev parent reply other threads:[~2012-06-13 16:20 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-13 16:19 [RFC GIT PULL] nohz: Basic cputime accounting for adaptive tickless Frederic Weisbecker
2012-06-13 16:19 ` [PATCH 1/7] nohz: Add more comment about CONFIG_NO_HZ Frederic Weisbecker
2012-06-13 16:19 ` [PATCH 2/7] nohz: Introduce adaptive nohz config Frederic Weisbecker
2012-06-13 16:19 ` [PATCH 3/7] nohz: Generalize tickless cpu time accounting Frederic Weisbecker
2012-06-13 16:19 ` [PATCH 4/7] nohz: Account user and system times in adaptive nohz mode Frederic Weisbecker
2012-06-13 16:19 ` Frederic Weisbecker [this message]
2012-06-13 16:19 ` [PATCH 6/7] x86: Add adaptive tickless hooks on do_notify_resume() Frederic Weisbecker
2012-06-13 16:19 ` [PATCH 7/7] x86: Exception hooks for adaptive tickless Frederic Weisbecker
2012-06-13 16:35 ` [RFC GIT PULL] nohz: Basic cputime accounting " Frederic Weisbecker
2012-06-14 9:07 ` Peter Zijlstra
2012-06-14 9:10 ` Peter Zijlstra
2012-06-14 11:12 ` Frederic Weisbecker
2012-06-14 11:16 ` Ingo Molnar
2012-06-14 11:21 ` Thomas Gleixner
2012-06-14 11:22 ` Frederic Weisbecker
2012-06-14 12:48 ` Martin Schwidefsky
2012-06-14 13:04 ` Frederic Weisbecker
2012-06-14 14:36 ` Ingo Molnar
2012-06-14 17:34 ` Frederic Weisbecker
2012-06-15 12:13 ` Ingo Molnar
2012-06-14 13:42 ` Frederic Weisbecker
2012-06-14 15:18 ` Martin Schwidefsky
2012-06-15 17:37 ` Frederic Weisbecker
2012-06-18 10:46 ` Martin Schwidefsky
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