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Subject[PATCH 1/8] OProfile: Rework oprofile_add_ibs_sample() function
Date
Code looks much more cleaner now.

Signed-off-by: Robert Richter <robert.richter@amd.com>
---
arch/x86/oprofile/op_model_amd.c | 5 ++-
drivers/oprofile/cpu_buffer.c | 48 ++++++++++++--------------------------
2 files changed, 18 insertions(+), 35 deletions(-)

diff --git a/arch/x86/oprofile/op_model_amd.c b/arch/x86/oprofile/op_model_amd.c
index d9faf60..54632e0 100644
--- a/arch/x86/oprofile/op_model_amd.c
+++ b/arch/x86/oprofile/op_model_amd.c
@@ -67,8 +67,9 @@ static unsigned long reset_value[NUM_COUNTERS];

/* The function interface needs to be fixed, something like add
data. Should then be added to linux/oprofile.h. */
-extern void oprofile_add_ibs_sample(struct pt_regs *const regs,
- unsigned int * const ibs_sample, u8 code);
+extern void
+oprofile_add_ibs_sample(struct pt_regs *const regs,
+ unsigned int * const ibs_sample, int ibs_code);

struct ibs_fetch_sample {
/* MSRC001_1031 IBS Fetch Linear Address Register */
diff --git a/drivers/oprofile/cpu_buffer.c b/drivers/oprofile/cpu_buffer.c
index e1bd5a9..d6c6827 100644
--- a/drivers/oprofile/cpu_buffer.c
+++ b/drivers/oprofile/cpu_buffer.c
@@ -257,21 +257,23 @@ void oprofile_add_sample(struct pt_regs * const regs, unsigned long event)

#ifdef CONFIG_OPROFILE_IBS

-#define MAX_IBS_SAMPLE_SIZE 14
-static int log_ibs_sample(struct oprofile_cpu_buffer *cpu_buf,
- unsigned long pc, int is_kernel, unsigned int *ibs, int ibs_code)
+#define MAX_IBS_SAMPLE_SIZE 14
+
+void oprofile_add_ibs_sample(struct pt_regs *const regs,
+ unsigned int * const ibs_sample, int ibs_code)
{
+ int is_kernel = !user_mode(regs);
+ struct oprofile_cpu_buffer *cpu_buf = &__get_cpu_var(cpu_buffer);
struct task_struct *task;

cpu_buf->sample_received++;

if (nr_available_slots(cpu_buf) < MAX_IBS_SAMPLE_SIZE) {
+ /* we can't backtrace since we lost the source of this event */
cpu_buf->sample_lost_overflow++;
- return 0;
+ return;
}

- is_kernel = !!is_kernel;
-
/* notice a switch from user->kernel or vice versa */
if (cpu_buf->last_is_kernel != is_kernel) {
cpu_buf->last_is_kernel = is_kernel;
@@ -281,7 +283,6 @@ static int log_ibs_sample(struct oprofile_cpu_buffer *cpu_buf,
/* notice a task switch */
if (!is_kernel) {
task = current;
-
if (cpu_buf->last_task != task) {
cpu_buf->last_task = task;
add_code(cpu_buf, (unsigned long)task);
@@ -289,36 +290,17 @@ static int log_ibs_sample(struct oprofile_cpu_buffer *cpu_buf,
}

add_code(cpu_buf, ibs_code);
- add_sample(cpu_buf, ibs[0], ibs[1]);
- add_sample(cpu_buf, ibs[2], ibs[3]);
- add_sample(cpu_buf, ibs[4], ibs[5]);
+ add_sample(cpu_buf, ibs_sample[0], ibs_sample[1]);
+ add_sample(cpu_buf, ibs_sample[2], ibs_sample[3]);
+ add_sample(cpu_buf, ibs_sample[4], ibs_sample[5]);

if (ibs_code == IBS_OP_BEGIN) {
- add_sample(cpu_buf, ibs[6], ibs[7]);
- add_sample(cpu_buf, ibs[8], ibs[9]);
- add_sample(cpu_buf, ibs[10], ibs[11]);
- }
-
- return 1;
-}
-
-void oprofile_add_ibs_sample(struct pt_regs *const regs,
- unsigned int * const ibs_sample, u8 code)
-{
- int is_kernel = !user_mode(regs);
- unsigned long pc = profile_pc(regs);
-
- struct oprofile_cpu_buffer *cpu_buf =
- &per_cpu(cpu_buffer, smp_processor_id());
-
- if (!backtrace_depth) {
- log_ibs_sample(cpu_buf, pc, is_kernel, ibs_sample, code);
- return;
+ add_sample(cpu_buf, ibs_sample[6], ibs_sample[7]);
+ add_sample(cpu_buf, ibs_sample[8], ibs_sample[9]);
+ add_sample(cpu_buf, ibs_sample[10], ibs_sample[11]);
}

- /* if log_sample() fails we can't backtrace since we lost the source
- * of this event */
- if (log_ibs_sample(cpu_buf, pc, is_kernel, ibs_sample, code))
+ if (backtrace_depth)
oprofile_ops.backtrace(regs, backtrace_depth);
}

--
1.6.0.1



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