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Merge branch 'perf/urgent' into perf/core, to pick up fixes

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Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Ingo Molnar
2019-04-16 12:14:46 +02:00
parent 496156e364 9d5dcc93a6
commit cc8670945d
5 changed files with 58 additions and 58 deletions
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37
kernel/events/core.c
View File

@@ -9077,26 +9077,29 @@ static void perf_event_addr_filters_apply(struct perf_event *event)
if (task == TASK_TOMBSTONE)
return;
if (!ifh->nr_file_filters)
return;
if (ifh->nr_file_filters) {
mm = get_task_mm(event->ctx->task);
if (!mm)
goto restart;
mm = get_task_mm(event->ctx->task);
if (!mm)
goto restart;
down_read(&mm->mmap_sem);
down_read(&mm->mmap_sem);
}
raw_spin_lock_irqsave(&ifh->lock, flags);
list_for_each_entry(filter, &ifh->list, entry) {
event->addr_filter_ranges[count].start = 0;
event->addr_filter_ranges[count].size = 0;
if (filter->path.dentry) {
/*
* Adjust base offset if the filter is associated to a
* binary that needs to be mapped:
*/
event->addr_filter_ranges[count].start = 0;
event->addr_filter_ranges[count].size = 0;
/*
* Adjust base offset if the filter is associated to a binary
* that needs to be mapped:
*/
if (filter->path.dentry)
perf_addr_filter_apply(filter, mm, &event->addr_filter_ranges[count]);
} else {
event->addr_filter_ranges[count].start = filter->offset;
event->addr_filter_ranges[count].size = filter->size;
}
count++;
}
@@ -9104,9 +9107,11 @@ static void perf_event_addr_filters_apply(struct perf_event *event)
event->addr_filters_gen++;
raw_spin_unlock_irqrestore(&ifh->lock, flags);
up_read(&mm->mmap_sem);
if (ifh->nr_file_filters) {
up_read(&mm->mmap_sem);
mmput(mm);
mmput(mm);
}
restart:
perf_event_stop(event, 1);

33
kernel/events/ring_buffer.c
View File

@@ -455,24 +455,21 @@ void perf_aux_output_end(struct perf_output_handle *handle, unsigned long size)
rb->aux_head += size;
}
if (size || handle->aux_flags) {
/*
* Only send RECORD_AUX if we have something useful to communicate
*
* Note: the OVERWRITE records by themselves are not considered
* useful, as they don't communicate any *new* information,
* aside from the short-lived offset, that becomes history at
* the next event sched-in and therefore isn't useful.
* The userspace that needs to copy out AUX data in overwrite
* mode should know to use user_page::aux_head for the actual
* offset. So, from now on we don't output AUX records that
* have *only* OVERWRITE flag set.
*/
if (handle->aux_flags & ~(u64)PERF_AUX_FLAG_OVERWRITE)
perf_event_aux_event(handle->event, aux_head, size,
handle->aux_flags);
}
/*
* Only send RECORD_AUX if we have something useful to communicate
*
* Note: the OVERWRITE records by themselves are not considered
* useful, as they don't communicate any *new* information,
* aside from the short-lived offset, that becomes history at
* the next event sched-in and therefore isn't useful.
* The userspace that needs to copy out AUX data in overwrite
* mode should know to use user_page::aux_head for the actual
* offset. So, from now on we don't output AUX records that
* have *only* OVERWRITE flag set.
*/
if (size || (handle->aux_flags & ~(u64)PERF_AUX_FLAG_OVERWRITE))
perf_event_aux_event(handle->event, aux_head, size,
handle->aux_flags);
rb->user_page->aux_head = rb->aux_head;
if (rb_need_aux_wakeup(rb))

6
kernel/kprobes.c
View File

@@ -709,7 +709,6 @@ static void unoptimize_kprobe(struct kprobe *p, bool force)
static int reuse_unused_kprobe(struct kprobe *ap)
{
struct optimized_kprobe *op;
int ret;
/*
* Unused kprobe MUST be on the way of delayed unoptimizing (means
@@ -720,9 +719,8 @@ static int reuse_unused_kprobe(struct kprobe *ap)
/* Enable the probe again */
ap->flags &= ~KPROBE_FLAG_DISABLED;
/* Optimize it again (remove from op->list) */
ret = kprobe_optready(ap);
if (ret)
return ret;
if (!kprobe_optready(ap))
return -EINVAL;
optimize_kprobe(ap);
return 0;