redonkable/alistair23-linux
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Merge branch 'perf/urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/frederic/random-tracing into perf/urgent

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This commit is contained in:
Ingo Molnar 2009-12-07 08:03:35 +01:00
parent 3a9a0beba2 56053170ea
commit 11a80ddbf3
2 changed files with 58 additions and 40 deletions
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2
include/linux/hw_breakpoint.h
View file

@ -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);
/*

96
kernel/hw_breakpoint.c
View file

@ -83,50 +83,16 @@ static unsigned int max_task_bp_pinned(int cpu)
return 0;
}
/*
* 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 int task_bp_pinned(struct task_struct *tsk)
{
if (cpu >= 0) {
slots->pinned = per_cpu(nr_cpu_bp_pinned, cpu);
slots->pinned += max_task_bp_pinned(cpu);
slots->flexible = per_cpu(nr_bp_flexible, cpu);
return;
}
for_each_online_cpu(cpu) {
unsigned int nr;
nr = per_cpu(nr_cpu_bp_pinned, cpu);
nr += max_task_bp_pinned(cpu);
if (nr > slots->pinned)
slots->pinned = nr;
nr = per_cpu(nr_bp_flexible, cpu);
if (nr > slots->flexible)
slots->flexible = nr;
}
}
/*
* Add a pinned breakpoint for the given task in our constraint table
*/
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;
struct perf_event *bp;
unsigned long flags;
int count = 0;
if (WARN_ONCE(!ctx, "No perf context for this task"))
return;
return 0;
list = &ctx->event_list;
@ -143,8 +109,58 @@ static void toggle_bp_task_slot(struct task_struct *tsk, int cpu, bool enable)
spin_unlock_irqrestore(&ctx->lock, flags);
if (WARN_ONCE(count < 0, "No breakpoint counter found in the counter list"))
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, 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);
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;
}
for_each_online_cpu(cpu) {
unsigned int nr;
nr = per_cpu(nr_cpu_bp_pinned, cpu);
if (!tsk)
nr += max_task_bp_pinned(cpu);
else
nr += task_bp_pinned(tsk);
if (nr > slots->pinned)
slots->pinned = nr;
nr = per_cpu(nr_bp_flexible, cpu);
if (nr > slots->flexible)
slots->flexible = nr;
}
}
/*
* Add a pinned breakpoint for the given task in our constraint table
*/
static void toggle_bp_task_slot(struct task_struct *tsk, int cpu, bool enable)
{
unsigned int *tsk_pinned;
int count = 0;
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) {