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drm: make drm_file use keyed wakeups

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Some processes, such as systemd, are only polling for EPOLLERR|EPOLLHUP.
As drm_file uses unkeyed wakeups, such a poll receives many spurious
wakeups from uninteresting events.

Use keyed wakeups to allow the wakeup target to more efficiently discard
these uninteresting events.

Signed-off-by: Kenny Levinsen <kl@kl.wtf>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20200424145103.3048-1-kl@kl.wtf
This commit is contained in:
Kenny Levinsen 2020-04-24 16:51:03 +02:00 committed by Daniel Vetter
parent d839494924
commit 87189b7895
1 changed files with 4 additions and 2 deletions
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6
drivers/gpu/drm/drm_file.c
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@ -613,7 +613,8 @@ put_back_event:
file_priv->event_space -= length;
list_add(&e->link, &file_priv->event_list);
spin_unlock_irq(&dev->event_lock);
wake_up_interruptible(&file_priv->event_wait);
wake_up_interruptible_poll(&file_priv->event_wait,
EPOLLIN | EPOLLRDNORM);
break;
}
@ -809,7 +810,8 @@ void drm_send_event_locked(struct drm_device *dev, struct drm_pending_event *e)
list_del(&e->pending_link);
list_add_tail(&e->link,
&e->file_priv->event_list);
wake_up_interruptible(&e->file_priv->event_wait);
wake_up_interruptible_poll(&e->file_priv->event_wait,
EPOLLIN | EPOLLRDNORM);
}
EXPORT_SYMBOL(drm_send_event_locked);