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>
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5ee25c8731
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@ -74,6 +74,32 @@ static void fini_debug_store_on_cpu(int cpu)
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wrmsr_on_cpu(cpu, MSR_IA32_DS_AREA, 0, 0);
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}
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static int alloc_pebs_buffer(int cpu)
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{
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struct debug_store *ds = per_cpu(cpu_hw_events, cpu).ds;
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int max, thresh = 1; /* always use a single PEBS record */
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void *buffer;
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if (!x86_pmu.pebs)
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return 0;
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buffer = kzalloc(PEBS_BUFFER_SIZE, GFP_KERNEL);
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if (unlikely(!buffer))
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return -ENOMEM;
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max = PEBS_BUFFER_SIZE / x86_pmu.pebs_record_size;
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ds->pebs_buffer_base = (u64)(unsigned long)buffer;
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ds->pebs_index = ds->pebs_buffer_base;
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ds->pebs_absolute_maximum = ds->pebs_buffer_base +
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max * x86_pmu.pebs_record_size;
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ds->pebs_interrupt_threshold = ds->pebs_buffer_base +
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thresh * x86_pmu.pebs_record_size;
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return 0;
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}
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static void release_pebs_buffer(int cpu)
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{
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struct debug_store *ds = per_cpu(cpu_hw_events, cpu).ds;
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@ -85,6 +111,32 @@ static void release_pebs_buffer(int cpu)
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ds->pebs_buffer_base = 0;
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}
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static int alloc_bts_buffer(int cpu)
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{
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struct debug_store *ds = per_cpu(cpu_hw_events, cpu).ds;
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int max, thresh;
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void *buffer;
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if (!x86_pmu.bts)
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return 0;
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buffer = kzalloc(BTS_BUFFER_SIZE, GFP_KERNEL);
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if (unlikely(!buffer))
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return -ENOMEM;
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max = BTS_BUFFER_SIZE / BTS_RECORD_SIZE;
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thresh = max / 16;
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ds->bts_buffer_base = (u64)(unsigned long)buffer;
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ds->bts_index = ds->bts_buffer_base;
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ds->bts_absolute_maximum = ds->bts_buffer_base +
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max * BTS_RECORD_SIZE;
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ds->bts_interrupt_threshold = ds->bts_absolute_maximum -
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thresh * BTS_RECORD_SIZE;
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return 0;
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}
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static void release_bts_buffer(int cpu)
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{
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struct debug_store *ds = per_cpu(cpu_hw_events, cpu).ds;
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@ -133,8 +185,6 @@ static int reserve_ds_buffers(void)
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for_each_possible_cpu(cpu) {
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struct debug_store *ds;
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void *buffer;
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int max, thresh;
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err = -ENOMEM;
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ds = kzalloc(sizeof(*ds), GFP_KERNEL);
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@ -142,39 +192,11 @@ static int reserve_ds_buffers(void)
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break;
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per_cpu(cpu_hw_events, cpu).ds = ds;
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if (x86_pmu.bts) {
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buffer = kzalloc(BTS_BUFFER_SIZE, GFP_KERNEL);
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if (unlikely(!buffer))
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break;
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if (alloc_bts_buffer(cpu))
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break;
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max = BTS_BUFFER_SIZE / BTS_RECORD_SIZE;
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thresh = max / 16;
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ds->bts_buffer_base = (u64)(unsigned long)buffer;
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ds->bts_index = ds->bts_buffer_base;
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ds->bts_absolute_maximum = ds->bts_buffer_base +
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max * BTS_RECORD_SIZE;
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ds->bts_interrupt_threshold = ds->bts_absolute_maximum -
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thresh * BTS_RECORD_SIZE;
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}
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if (x86_pmu.pebs) {
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buffer = kzalloc(PEBS_BUFFER_SIZE, GFP_KERNEL);
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if (unlikely(!buffer))
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break;
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max = PEBS_BUFFER_SIZE / x86_pmu.pebs_record_size;
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ds->pebs_buffer_base = (u64)(unsigned long)buffer;
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ds->pebs_index = ds->pebs_buffer_base;
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ds->pebs_absolute_maximum = ds->pebs_buffer_base +
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max * x86_pmu.pebs_record_size;
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/*
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* Always use single record PEBS
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*/
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ds->pebs_interrupt_threshold = ds->pebs_buffer_base +
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x86_pmu.pebs_record_size;
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}
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if (alloc_pebs_buffer(cpu))
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break;
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err = 0;
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}
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