> [6/9] ia64_acct_gate_on_switch.patch
Well, let's begin building check points.
We have already get hook points by account_system_vtime(),
so we have points at:
- irq_enter
- irq_exit
- softirq entrance
- softirq exit
and the rests are points at:
- context switch
- kernel entrance
- kernel exit
Start from first one.
This patch just create a hook point at context switch and
make a function for the point. The inside of this function
is written in last patch.
Thanks,
H.Seto
Signed-off-by: Hidetoshi Seto <seto.hidetoshi@xxxxxxxxxxxxxx>
---
arch/ia64/kernel/time.c | 5 +++++
include/asm-ia64/system.h | 8 ++++++++
2 files changed, 13 insertions(+)
Index: linux-2.6.23/arch/ia64/kernel/time.c
===================================================================
--- linux-2.6.23.orig/arch/ia64/kernel/time.c
+++ linux-2.6.23/arch/ia64/kernel/time.c
@@ -64,6 +64,11 @@
#include <linux/kernel_stat.h>
#include <linux/posix-timers.h>
+void ia64_account_on_switch(struct task_struct *prev, struct task_struct *next)
+{
+
+}
+
/*
* Account time for a transition between system, hard irq
* or soft irq state.
Index: linux-2.6.23/include/asm-ia64/system.h
===================================================================
--- linux-2.6.23.orig/include/asm-ia64/system.h
+++ linux-2.6.23/include/asm-ia64/system.h
@@ -208,6 +208,13 @@
extern void ia64_save_extra (struct task_struct *task);
extern void ia64_load_extra (struct task_struct *task);
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING
+extern void ia64_account_on_switch (struct task_struct *prev, struct task_struct *next);
+# define IA64_ACCOUNT_ON_SWITCH(p,n) ia64_account_on_switch(p,n)
+#else
+# define IA64_ACCOUNT_ON_SWITCH(p,n)
+#endif
+
#ifdef CONFIG_PERFMON
DECLARE_PER_CPU(unsigned long, pfm_syst_info);
# define PERFMON_IS_SYSWIDE() (__get_cpu_var(pfm_syst_info) & 0x1)
@@ -220,6 +227,7 @@
|| IS_IA32_PROCESS(task_pt_regs(t)) || PERFMON_IS_SYSWIDE())
#define __switch_to(prev,next,last) do { \
+ IA64_ACCOUNT_ON_SWITCH(prev, next); \
if (IA64_HAS_EXTRA_STATE(prev)) \
ia64_save_extra(prev); \
if (IA64_HAS_EXTRA_STATE(next)) \
-
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