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perf, x86: Extract DS alloc/free functions 

Again, mostly a cleanup to unclutter the reserve_ds_buffer() code.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Stephane Eranian <eranian@google.com>
LKML-Reference: <20101019134808.304495776@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2010-10-19 14:37:23 +02:00 committed by Ingo Molnar
parent 5ee25c8731
commit 65af94baca
1 changed files with 26 additions and 14 deletions
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40
arch/x86/kernel/cpu/perf_event_intel_ds.c
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@ -148,6 +148,30 @@ static void release_bts_buffer(int cpu)
ds->bts_buffer_base = 0;
}
static int alloc_ds_buffer(int cpu)
{
struct debug_store *ds;
ds = kzalloc(sizeof(*ds), GFP_KERNEL);
if (unlikely(!ds))
return -ENOMEM;
per_cpu(cpu_hw_events, cpu).ds = ds;
return 0;
}
static void release_ds_buffer(int cpu)
{
struct debug_store *ds = per_cpu(cpu_hw_events, cpu).ds;
if (!ds)
return;
per_cpu(cpu_hw_events, cpu).ds = NULL;
kfree(ds);
}
static void release_ds_buffers(void)
{
int cpu;
@ -160,16 +184,9 @@ static void release_ds_buffers(void)
fini_debug_store_on_cpu(cpu);
for_each_possible_cpu(cpu) {
struct debug_store *ds = per_cpu(cpu_hw_events, cpu).ds;
if (!ds)
continue;
release_pebs_buffer(cpu);
release_bts_buffer(cpu);
per_cpu(cpu_hw_events, cpu).ds = NULL;
kfree(ds);
release_ds_buffer(cpu);
}
put_online_cpus();
}
@ -184,13 +201,8 @@ static int reserve_ds_buffers(void)
get_online_cpus();
for_each_possible_cpu(cpu) {
struct debug_store *ds;
err = -ENOMEM;
ds = kzalloc(sizeof(*ds), GFP_KERNEL);
if (unlikely(!ds))
if (alloc_ds_buffer(cpu))
break;
per_cpu(cpu_hw_events, cpu).ds = ds;
if (alloc_bts_buffer(cpu))
break;