Software events are required as part of the measurable stuff by the
Linux performance counter subsystem. Here is the list of events added by
this patch:
PERF_COUNT_SW_PAGE_FAULTS
PERF_COUNT_SW_PAGE_FAULTS_MIN
PERF_COUNT_SW_PAGE_FAULTS_MAJ
PERF_COUNT_SW_ALIGNMENT_FAULTS
PERF_COUNT_SW_EMULATION_FAULTS
Signed-off-by: Deng-Cheng Zhu <dengcheng.zhu@xxxxxxxxx>
---
arch/mips/Kconfig | 2 ++
arch/mips/kernel/traps.c | 18 +++++++++++++++---
arch/mips/kernel/unaligned.c | 5 +++++
arch/mips/math-emu/cp1emu.c | 3 +++
arch/mips/mm/fault.c | 11 +++++++++--
5 files changed, 34 insertions(+), 5 deletions(-)
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 7d19c62..aee2cda 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -4,6 +4,8 @@ config MIPS
select HAVE_GENERIC_DMA_COHERENT
select HAVE_IDE
select HAVE_OPROFILE
+ select HAVE_PERF_EVENTS
+ select PERF_USE_VMALLOC
select GENERIC_ATOMIC64 if !64BIT
select HAVE_ARCH_KGDB
select HAVE_FUNCTION_TRACER
diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index d612c6d..bdaa5d7 100644
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -26,6 +26,7 @@
#include <linux/kgdb.h>
#include <linux/kdebug.h>
#include <linux/notifier.h>
+#include <linux/perf_event.h>
#include <asm/bootinfo.h>
#include <asm/branch.h>
@@ -562,10 +563,16 @@ static inline int simulate_sc(struct pt_regs *regs, unsigned int opcode)
*/
static int simulate_llsc(struct pt_regs *regs, unsigned int opcode)
{
- if ((opcode & OPCODE) == LL)
+ if ((opcode & OPCODE) == LL) {
+ perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS,
+ 1, 0, regs, 0);
return simulate_ll(regs, opcode);
- if ((opcode & OPCODE) == SC)
+ }
+ if ((opcode & OPCODE) == SC) {
+ perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS,
+ 1, 0, regs, 0);
return simulate_sc(regs, opcode);
+ }
return -1; /* Must be something else ... */
}
@@ -581,6 +588,8 @@ static int simulate_rdhwr(struct pt_regs *regs, unsigned int opcode)
if ((opcode & OPCODE) == SPEC3 && (opcode & FUNC) == RDHWR) {
int rd = (opcode & RD) >> 11;
int rt = (opcode & RT) >> 16;
+ perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS,
+ 1, 0, regs, 0);
switch (rd) {
case 0: /* CPU number */
regs->regs[rt] = smp_processor_id();
@@ -616,8 +625,11 @@ static int simulate_rdhwr(struct pt_regs *regs, unsigned int opcode)
static int simulate_sync(struct pt_regs *regs, unsigned int opcode)
{
- if ((opcode & OPCODE) == SPEC0 && (opcode & FUNC) == SYNC)
+ if ((opcode & OPCODE) == SPEC0 && (opcode & FUNC) == SYNC) {
+ perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS,
+ 1, 0, regs, 0);
return 0;
+ }
return -1; /* Must be something else ... */
}
diff --git a/arch/mips/kernel/unaligned.c b/arch/mips/kernel/unaligned.c
index 69b039c..a319c7a 100644
--- a/arch/mips/kernel/unaligned.c
+++ b/arch/mips/kernel/unaligned.c
@@ -78,6 +78,7 @@
#include <linux/smp.h>
#include <linux/sched.h>
#include <linux/debugfs.h>
+#include <linux/perf_event.h>
#include <asm/asm.h>
#include <asm/branch.h>
#include <asm/byteorder.h>
@@ -109,6 +110,8 @@ static void emulate_load_store_insn(struct pt_regs *regs,
unsigned long value;
unsigned int res;
+ perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS,
+ 1, 0, regs, 0);
regs->regs[0] = 0;
/*
@@ -513,6 +516,8 @@ asmlinkage void do_ade(struct pt_regs *regs)
unsigned int __user *pc;
mm_segment_t seg;
+ perf_sw_event(PERF_COUNT_SW_ALIGNMENT_FAULTS,
+ 1, 0, regs, regs->cp0_badvaddr);
/*
* Did we catch a fault trying to load an instruction?
* Or are we running in MIPS16 mode?
diff --git a/arch/mips/math-emu/cp1emu.c b/arch/mips/math-emu/cp1emu.c
index 8f2f8e9..b3fa153 100644
--- a/arch/mips/math-emu/cp1emu.c
+++ b/arch/mips/math-emu/cp1emu.c
@@ -37,6 +37,7 @@
#include <linux/sched.h>
#include <linux/module.h>
#include <linux/debugfs.h>
+#include <linux/perf_event.h>
#include <asm/inst.h>
#include <asm/bootinfo.h>
@@ -256,6 +257,8 @@ static int cop1Emulate(struct pt_regs *xcp, struct mips_fpu_struct *ctx)
}
emul:
+ perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS,
+ 1, 0, xcp, 0);
MIPS_FPU_EMU_INC_STATS(emulated);
switch (MIPSInst_OPCODE(ir)) {
case ldc1_op:{
diff --git a/arch/mips/mm/fault.c b/arch/mips/mm/fault.c
index b78f7d9..5987d2b 100644
--- a/arch/mips/mm/fault.c
+++ b/arch/mips/mm/fault.c
@@ -18,6 +18,7 @@
#include <linux/smp.h>
#include <linux/vt_kern.h> /* For unblank_screen() */
#include <linux/module.h>
+#include <linux/perf_event.h>
#include <asm/branch.h>
#include <asm/mmu_context.h>
@@ -132,6 +133,7 @@ good_area:
* the fault.
*/
fault = handle_mm_fault(mm, vma, address, write ? FAULT_FLAG_WRITE : 0);
+ perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, 0, regs, address);
if (unlikely(fault & VM_FAULT_ERROR)) {
if (fault & VM_FAULT_OOM)
goto out_of_memory;
@@ -139,10 +141,15 @@ good_area:
goto do_sigbus;
BUG();
}
- if (fault & VM_FAULT_MAJOR)
+ if (fault & VM_FAULT_MAJOR) {
+ perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MAJ,
+ 1, 0, regs, address);
tsk->maj_flt++;
- else
+ } else {
+ perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MIN,
+ 1, 0, regs, address);
tsk->min_flt++;
+ }
up_read(&mm->mmap_sem);
return;
--
1.7.0.4
