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oprofile: hotplug cpu fix

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This patch addresses problems when hotplugging cpus while
profiling. Instead of allocating only online cpus, all possible cpu
buffers are allocated, which allows cpus to be onlined during
operation. If a cpu is offlined before profiling is shutdown
wq_sync_buffer checks for this condition then cancels this work and
does not sync this buffer.

Signed-off-by: Chris J Arges <arges@linux.vnet.ibm.com>
Signed-off-by: Robert Richter <robert.richter@amd.com>
This commit is contained in:
Chris J Arges 2008-10-15 11:03:39 -05:00 committed by Robert Richter
parent 0f019cc477
commit 4bd9b9dc97
1 changed files with 7 additions and 2 deletions
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9
drivers/oprofile/cpu_buffer.c
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@ -39,7 +39,7 @@ void free_cpu_buffers(void)
{
int i;
for_each_online_cpu(i) {
for_each_possible_cpu(i) {
vfree(per_cpu(cpu_buffer, i).buffer);
per_cpu(cpu_buffer, i).buffer = NULL;
}
@ -51,7 +51,7 @@ int alloc_cpu_buffers(void)
unsigned long buffer_size = fs_cpu_buffer_size;
for_each_online_cpu(i) {
for_each_possible_cpu(i) {
struct oprofile_cpu_buffer *b = &per_cpu(cpu_buffer, i);
b->buffer = vmalloc_node(sizeof(struct op_sample) * buffer_size,
@ -350,6 +350,11 @@ static void wq_sync_buffer(struct work_struct *work)
if (b->cpu != smp_processor_id()) {
printk(KERN_DEBUG "WQ on CPU%d, prefer CPU%d\n",
smp_processor_id(), b->cpu);
if (!cpu_online(b->cpu)) {
cancel_delayed_work(&b->work);
return;
}
}
sync_buffer(b->cpu);