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perf, x86: Extract PEBS/BTS allocation functions 

Mostly a cleanup.. it reduces code indentation and makes the code flow
of reserve_ds_buffers() clearer.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Stephane Eranian <eranian@google.com>
LKML-Reference: <20101019134808.253453452@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2010-10-19 14:15:04 +02:00 committed by Ingo Molnar
parent b39f88acd7
commit 5ee25c8731
1 changed files with 56 additions and 34 deletions
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90
arch/x86/kernel/cpu/perf_event_intel_ds.c
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@ -74,6 +74,32 @@ static void fini_debug_store_on_cpu(int cpu)
wrmsr_on_cpu(cpu, MSR_IA32_DS_AREA, 0, 0); wrmsr_on_cpu(cpu, MSR_IA32_DS_AREA, 0, 0);
} }
static int alloc_pebs_buffer(int cpu)
{
struct debug_store *ds = per_cpu(cpu_hw_events, cpu).ds;
int max, thresh = 1; /* always use a single PEBS record */
void *buffer;
if (!x86_pmu.pebs)
return 0;
buffer = kzalloc(PEBS_BUFFER_SIZE, GFP_KERNEL);
if (unlikely(!buffer))
return -ENOMEM;
max = PEBS_BUFFER_SIZE / x86_pmu.pebs_record_size;
ds->pebs_buffer_base = (u64)(unsigned long)buffer;
ds->pebs_index = ds->pebs_buffer_base;
ds->pebs_absolute_maximum = ds->pebs_buffer_base +
max * x86_pmu.pebs_record_size;
ds->pebs_interrupt_threshold = ds->pebs_buffer_base +
thresh * x86_pmu.pebs_record_size;
return 0;
}
static void release_pebs_buffer(int cpu) static void release_pebs_buffer(int cpu)
{ {
struct debug_store *ds = per_cpu(cpu_hw_events, cpu).ds; struct debug_store *ds = per_cpu(cpu_hw_events, cpu).ds;
@ -85,6 +111,32 @@ static void release_pebs_buffer(int cpu)
ds->pebs_buffer_base = 0; ds->pebs_buffer_base = 0;
} }
static int alloc_bts_buffer(int cpu)
{
struct debug_store *ds = per_cpu(cpu_hw_events, cpu).ds;
int max, thresh;
void *buffer;
if (!x86_pmu.bts)
return 0;
buffer = kzalloc(BTS_BUFFER_SIZE, GFP_KERNEL);
if (unlikely(!buffer))
return -ENOMEM;
max = BTS_BUFFER_SIZE / BTS_RECORD_SIZE;
thresh = max / 16;
ds->bts_buffer_base = (u64)(unsigned long)buffer;
ds->bts_index = ds->bts_buffer_base;
ds->bts_absolute_maximum = ds->bts_buffer_base +
max * BTS_RECORD_SIZE;
ds->bts_interrupt_threshold = ds->bts_absolute_maximum -
thresh * BTS_RECORD_SIZE;
return 0;
}
static void release_bts_buffer(int cpu) static void release_bts_buffer(int cpu)
{ {
struct debug_store *ds = per_cpu(cpu_hw_events, cpu).ds; struct debug_store *ds = per_cpu(cpu_hw_events, cpu).ds;
@ -133,8 +185,6 @@ static int reserve_ds_buffers(void)
for_each_possible_cpu(cpu) { for_each_possible_cpu(cpu) {
struct debug_store *ds; struct debug_store *ds;
void *buffer;
int max, thresh;
err = -ENOMEM; err = -ENOMEM;
ds = kzalloc(sizeof(*ds), GFP_KERNEL); ds = kzalloc(sizeof(*ds), GFP_KERNEL);
@ -142,39 +192,11 @@ static int reserve_ds_buffers(void)
break; break;
per_cpu(cpu_hw_events, cpu).ds = ds; per_cpu(cpu_hw_events, cpu).ds = ds;
if (x86_pmu.bts) { if (alloc_bts_buffer(cpu))
buffer = kzalloc(BTS_BUFFER_SIZE, GFP_KERNEL); break;
if (unlikely(!buffer))
break;
max = BTS_BUFFER_SIZE / BTS_RECORD_SIZE; if (alloc_pebs_buffer(cpu))
thresh = max / 16; break;
ds->bts_buffer_base = (u64)(unsigned long)buffer;
ds->bts_index = ds->bts_buffer_base;
ds->bts_absolute_maximum = ds->bts_buffer_base +
max * BTS_RECORD_SIZE;
ds->bts_interrupt_threshold = ds->bts_absolute_maximum -
thresh * BTS_RECORD_SIZE;
}
if (x86_pmu.pebs) {
buffer = kzalloc(PEBS_BUFFER_SIZE, GFP_KERNEL);
if (unlikely(!buffer))
break;
max = PEBS_BUFFER_SIZE / x86_pmu.pebs_record_size;
ds->pebs_buffer_base = (u64)(unsigned long)buffer;
ds->pebs_index = ds->pebs_buffer_base;
ds->pebs_absolute_maximum = ds->pebs_buffer_base +
max * x86_pmu.pebs_record_size;
/*
* Always use single record PEBS
*/
ds->pebs_interrupt_threshold = ds->pebs_buffer_base +
x86_pmu.pebs_record_size;
}
err = 0; err = 0;
} }