Commit 11a80ddb authored by Ingo Molnar's avatar Ingo Molnar

Merge branch 'perf/urgent' of...

Merge branch 'perf/urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/frederic/random-tracing into perf/urgent
parents 3a9a0beb 56053170
......@@ -22,6 +22,8 @@ enum {
static inline void hw_breakpoint_init(struct perf_event_attr *attr)
{
memset(attr, 0, sizeof(*attr));
attr->type = PERF_TYPE_BREAKPOINT;
attr->size = sizeof(*attr);
/*
......
......@@ -83,15 +83,51 @@ static unsigned int max_task_bp_pinned(int cpu)
return 0;
}
static int task_bp_pinned(struct task_struct *tsk)
{
struct perf_event_context *ctx = tsk->perf_event_ctxp;
struct list_head *list;
struct perf_event *bp;
unsigned long flags;
int count = 0;
if (WARN_ONCE(!ctx, "No perf context for this task"))
return 0;
list = &ctx->event_list;
spin_lock_irqsave(&ctx->lock, flags);
/*
* The current breakpoint counter is not included in the list
* at the open() callback time
*/
list_for_each_entry(bp, list, event_entry) {
if (bp->attr.type == PERF_TYPE_BREAKPOINT)
count++;
}
spin_unlock_irqrestore(&ctx->lock, flags);
return count;
}
/*
* Report the number of pinned/un-pinned breakpoints we have in
* a given cpu (cpu > -1) or in all of them (cpu = -1).
*/
static void fetch_bp_busy_slots(struct bp_busy_slots *slots, int cpu)
static void
fetch_bp_busy_slots(struct bp_busy_slots *slots, struct perf_event *bp)
{
int cpu = bp->cpu;
struct task_struct *tsk = bp->ctx->task;
if (cpu >= 0) {
slots->pinned = per_cpu(nr_cpu_bp_pinned, cpu);
slots->pinned += max_task_bp_pinned(cpu);
if (!tsk)
slots->pinned += max_task_bp_pinned(cpu);
else
slots->pinned += task_bp_pinned(tsk);
slots->flexible = per_cpu(nr_bp_flexible, cpu);
return;
......@@ -101,7 +137,10 @@ static void fetch_bp_busy_slots(struct bp_busy_slots *slots, int cpu)
unsigned int nr;
nr = per_cpu(nr_cpu_bp_pinned, cpu);
nr += max_task_bp_pinned(cpu);
if (!tsk)
nr += max_task_bp_pinned(cpu);
else
nr += task_bp_pinned(tsk);
if (nr > slots->pinned)
slots->pinned = nr;
......@@ -118,33 +157,10 @@ static void fetch_bp_busy_slots(struct bp_busy_slots *slots, int cpu)
*/
static void toggle_bp_task_slot(struct task_struct *tsk, int cpu, bool enable)
{
int count = 0;
struct perf_event *bp;
struct perf_event_context *ctx = tsk->perf_event_ctxp;
unsigned int *tsk_pinned;
struct list_head *list;
unsigned long flags;
if (WARN_ONCE(!ctx, "No perf context for this task"))
return;
list = &ctx->event_list;
spin_lock_irqsave(&ctx->lock, flags);
/*
* The current breakpoint counter is not included in the list
* at the open() callback time
*/
list_for_each_entry(bp, list, event_entry) {
if (bp->attr.type == PERF_TYPE_BREAKPOINT)
count++;
}
spin_unlock_irqrestore(&ctx->lock, flags);
int count = 0;
if (WARN_ONCE(count < 0, "No breakpoint counter found in the counter list"))
return;
count = task_bp_pinned(tsk);
tsk_pinned = per_cpu(task_bp_pinned, cpu);
if (enable) {
......@@ -233,7 +249,7 @@ int reserve_bp_slot(struct perf_event *bp)
mutex_lock(&nr_bp_mutex);
fetch_bp_busy_slots(&slots, bp->cpu);
fetch_bp_busy_slots(&slots, bp);
/* Flexible counters need to keep at least one slot */
if (slots.pinned + (!!slots.flexible) == HBP_NUM) {
......
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