leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Input: evdev - only signal polls on full packets

Browse Source 
This patch modifies evdev so that it only becomes readable when
the buffer contains an EV_SYN/SYN_REPORT event.

On SMP systems, it is possible for an evdev client blocked on poll()
to wake up and read events from the evdev ring buffer at the same
rate as they are enqueued.  This can result in high CPU usage,
particularly for MT devices, because the client ends up reading
events one at a time instead of reading complete packets.

We eliminate this problem by making the device readable only when
the buffer contains at least one complete packet.  This causes
clients to block until the entire packet is available.

Signed-off-by: Jeff Brown <jeffbrown@android.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Jeff Brown 2011-04-26 22:16:11 -07:00 committed by Dmitry Torokhov
parent 03351ff4d8
commit cdda911c34
1 changed files with 11 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
drivers/input/evdev.c
View File

@ -41,6 +41,7 @@ struct evdev {
struct evdev_client {
unsigned int head;
unsigned int tail;
unsigned int packet_head; /* [future] position of the first element of next packet */
spinlock_t buffer_lock; /* protects access to buffer, head and tail */
struct fasync_struct *fasync;
struct evdev *evdev;
@ -72,12 +73,16 @@ static void evdev_pass_event(struct evdev_client *client,
client->buffer[client->tail].type = EV_SYN;
client->buffer[client->tail].code = SYN_DROPPED;
client->buffer[client->tail].value = 0;
client->packet_head = client->tail;
}
if (event->type == EV_SYN && event->code == SYN_REPORT) {
client->packet_head = client->head;
kill_fasync(&client->fasync, SIGIO, POLL_IN);
}
spin_unlock(&client->buffer_lock);
if (event->type == EV_SYN)
kill_fasync(&client->fasync, SIGIO, POLL_IN);
}
/*
@ -387,12 +392,12 @@ static ssize_t evdev_read(struct file *file, char __user *buffer,
if (count < input_event_size())
return -EINVAL;
if (client->head == client->tail && evdev->exist &&
if (client->packet_head == client->tail && evdev->exist &&
(file->f_flags & O_NONBLOCK))
return -EAGAIN;
retval = wait_event_interruptible(evdev->wait,
client->head != client->tail || !evdev->exist);
client->packet_head != client->tail || !evdev->exist);
if (retval)
return retval;
@ -421,7 +426,7 @@ static unsigned int evdev_poll(struct file *file, poll_table *wait)
poll_wait(file, &evdev->wait, wait);
mask = evdev->exist ? POLLOUT | POLLWRNORM : POLLHUP | POLLERR;
if (client->head != client->tail)
if (client->packet_head != client->tail)
mask |= POLLIN | POLLRDNORM;
return mask;