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ring-buffer: Make resize disable per cpu buffer instead of total buffer 

When the ring buffer becomes writable for even when the trace file is read,
it must still not be resized. But since tracers can be activated while the
trace file is being read, the irqsoff tracer can modify the per CPU buffers,
and this can cause the reader of the trace file to update the wrong buffer's
resize disable bit, as the irqsoff tracer swaps out cpu buffers.

By making the resize disable per cpu_buffer, it makes the update follow the
per cpu_buffer even if it's swapped out with the snapshot buffer and keeps
the release of the trace file modifying the same data as the open did.

Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (VMware) 2020-03-27 16:21:22 -04:00
parent 153368ce1b
commit 07b8b10ec9
1 changed files with 30 additions and 13 deletions
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43
kernel/trace/ring_buffer.c
View File

@ -441,6 +441,7 @@ enum {
struct ring_buffer_per_cpu {
int cpu;
atomic_t record_disabled;
atomic_t resize_disabled;
struct trace_buffer *buffer;
raw_spinlock_t reader_lock; /* serialize readers */
arch_spinlock_t lock;
@ -484,7 +485,6 @@ struct trace_buffer {
unsigned flags;
int cpus;
atomic_t record_disabled;
atomic_t resize_disabled;
cpumask_var_t cpumask;
struct lock_class_key *reader_lock_key;
@ -1740,18 +1740,24 @@ int ring_buffer_resize(struct trace_buffer *buffer, unsigned long size,
size = nr_pages * BUF_PAGE_SIZE;
/*
* Don't succeed if resizing is disabled, as a reader might be
* manipulating the ring buffer and is expecting a sane state while
* this is true.
*/
if (atomic_read(&buffer->resize_disabled))
return -EBUSY;
/* prevent another thread from changing buffer sizes */
mutex_lock(&buffer->mutex);
if (cpu_id == RING_BUFFER_ALL_CPUS) {
/*
* Don't succeed if resizing is disabled, as a reader might be
* manipulating the ring buffer and is expecting a sane state while
* this is true.
*/
for_each_buffer_cpu(buffer, cpu) {
cpu_buffer = buffer->buffers[cpu];
if (atomic_read(&cpu_buffer->resize_disabled)) {
err = -EBUSY;
goto out_err_unlock;
}
}
/* calculate the pages to update */
for_each_buffer_cpu(buffer, cpu) {
cpu_buffer = buffer->buffers[cpu];
@ -1819,6 +1825,16 @@ int ring_buffer_resize(struct trace_buffer *buffer, unsigned long size,
if (nr_pages == cpu_buffer->nr_pages)
goto out;
/*
* Don't succeed if resizing is disabled, as a reader might be
* manipulating the ring buffer and is expecting a sane state while
* this is true.
*/
if (atomic_read(&cpu_buffer->resize_disabled)) {
err = -EBUSY;
goto out_err_unlock;
}
cpu_buffer->nr_pages_to_update = nr_pages -
cpu_buffer->nr_pages;
@ -1888,6 +1904,7 @@ int ring_buffer_resize(struct trace_buffer *buffer, unsigned long size,
free_buffer_page(bpage);
}
}
out_err_unlock:
mutex_unlock(&buffer->mutex);
return err;
}
@ -4294,7 +4311,7 @@ ring_buffer_read_prepare(struct trace_buffer *buffer, int cpu, gfp_t flags)
iter->cpu_buffer = cpu_buffer;
atomic_inc(&buffer->resize_disabled);
atomic_inc(&cpu_buffer->resize_disabled);
atomic_inc(&cpu_buffer->record_disabled);
return iter;
@ -4369,7 +4386,7 @@ ring_buffer_read_finish(struct ring_buffer_iter *iter)
raw_spin_unlock_irqrestore(&cpu_buffer->reader_lock, flags);
atomic_dec(&cpu_buffer->record_disabled);
atomic_dec(&cpu_buffer->buffer->resize_disabled);
atomic_dec(&cpu_buffer->resize_disabled);
kfree(iter->event);
kfree(iter);
}
@ -4474,7 +4491,7 @@ void ring_buffer_reset_cpu(struct trace_buffer *buffer, int cpu)
if (!cpumask_test_cpu(cpu, buffer->cpumask))
return;
atomic_inc(&buffer->resize_disabled);
atomic_inc(&cpu_buffer->resize_disabled);
atomic_inc(&cpu_buffer->record_disabled);
/* Make sure all commits have finished */
@ -4495,7 +4512,7 @@ void ring_buffer_reset_cpu(struct trace_buffer *buffer, int cpu)
raw_spin_unlock_irqrestore(&cpu_buffer->reader_lock, flags);
atomic_dec(&cpu_buffer->record_disabled);
atomic_dec(&buffer->resize_disabled);
atomic_dec(&cpu_buffer->resize_disabled);
}
EXPORT_SYMBOL_GPL(ring_buffer_reset_cpu);