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hw_breakpoint: Introduce cpumask_of_bp() 

Add the trivial helper which simply returns cpumask_of() or
cpu_possible_mask depending on bp->cpu.

Change fetch_bp_busy_slots() and toggle_bp_slot() to always do
for_each_cpu(cpumask_of_bp) to simplify the code and avoid the
code duplication.

Reported-by: Vince Weaver <vincent.weaver@maine.edu>
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Link: http://lkml.kernel.org/r/20130620155015.GA6340@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Oleg Nesterov 2013-06-20 17:50:15 +02:00 committed by Ingo Molnar
parent 7ab71f3244
commit 1c10adbb92
1 changed files with 17 additions and 26 deletions
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43
kernel/events/hw_breakpoint.c
View File

@ -127,6 +127,13 @@ static int task_bp_pinned(int cpu, struct perf_event *bp, enum bp_type_idx type)
return count;
}
static const struct cpumask *cpumask_of_bp(struct perf_event *bp)
{
if (bp->cpu >= 0)
return cpumask_of(bp->cpu);
return cpu_possible_mask;
}
/*
* Report the number of pinned/un-pinned breakpoints we have in
* a given cpu (cpu > -1) or in all of them (cpu = -1).
@ -135,25 +142,13 @@ static void
fetch_bp_busy_slots(struct bp_busy_slots *slots, struct perf_event *bp,
enum bp_type_idx type)
{
int cpu = bp->cpu;
struct task_struct *tsk = bp->hw.bp_target;
const struct cpumask *cpumask = cpumask_of_bp(bp);
int cpu;
if (cpu >= 0) {
slots->pinned = per_cpu(nr_cpu_bp_pinned[type], cpu);
if (!tsk)
slots->pinned += max_task_bp_pinned(cpu, type);
else
slots->pinned += task_bp_pinned(cpu, bp, type);
slots->flexible = per_cpu(nr_bp_flexible[type], cpu);
for_each_cpu(cpu, cpumask) {
unsigned int nr = per_cpu(nr_cpu_bp_pinned[type], cpu);
return;
}
for_each_possible_cpu(cpu) {
unsigned int nr;
nr = per_cpu(nr_cpu_bp_pinned[type], cpu);
if (!tsk)
if (!bp->hw.bp_target)
nr += max_task_bp_pinned(cpu, type);
else
nr += task_bp_pinned(cpu, bp, type);
@ -205,25 +200,21 @@ static void
toggle_bp_slot(struct perf_event *bp, bool enable, enum bp_type_idx type,
int weight)
{
int cpu = bp->cpu;
struct task_struct *tsk = bp->hw.bp_target;
const struct cpumask *cpumask = cpumask_of_bp(bp);
int cpu;
if (!enable)
weight = -weight;
/* Pinned counter cpu profiling */
if (!tsk) {
per_cpu(nr_cpu_bp_pinned[type], cpu) += weight;
if (!bp->hw.bp_target) {
per_cpu(nr_cpu_bp_pinned[type], bp->cpu) += weight;
return;
}
/* Pinned counter task profiling */
if (cpu >= 0) {
for_each_cpu(cpu, cpumask)
toggle_bp_task_slot(bp, cpu, type, weight);
} else {
for_each_possible_cpu(cpu)
toggle_bp_task_slot(bp, cpu, type, weight);
}
if (enable)
list_add_tail(&bp->hw.bp_list, &bp_task_head);