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Input: evdev - be less aggressive about sending SIGIO notifies

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When using realtime signals, we'll enqueue one signal for every event.
This is unfortunate, because (for example) keyboard presses are three
events: key, msc scancode, and syn.  They'll be enqueued fast enough in
kernel space that all three events will be ready to read by the time
userspace runs, so the first invocation of the signal handler will read
all three events, but then the second two invocations still have to run
to do no work.

Instead, only send the SIGIO notification on syn events.  This is a
slight abuse of SIGIO semantics, in principle it ought to fire as soon
as any events are readable.  But it matches evdev semantics, which is
more important since SIGIO is rather vaguely defined to begin with.

Signed-off-by: Adam Jackson <ajax@redhat.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Adam Jackson 2010-01-05 17:56:04 -08:00 committed by Dmitry Torokhov
parent 0ef7a26af1
commit 30a589fde0
1 changed files with 2 additions and 1 deletions
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3
drivers/input/evdev.c
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@ -59,7 +59,8 @@ static void evdev_pass_event(struct evdev_client *client,
client->head &= EVDEV_BUFFER_SIZE - 1;
spin_unlock(&client->buffer_lock);
kill_fasync(&client->fasync, SIGIO, POLL_IN);
if (event->type == EV_SYN)
kill_fasync(&client->fasync, SIGIO, POLL_IN);
}
/*