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authorPeter Hurley <peter@hurleysoftware.com>2013-12-09 18:23:52 +0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-12-09 23:09:24 +0400
commitacc0f67f307f52f7aec1cffdc40a786c15dd21d9 (patch)
tree30fe7356b60d42814b63c3de8ab00ac2bf9ed05d /drivers/tty/tty_buffer.c
parent9bbc3dca9d2212f900396ab9642c48279657a8c0 (diff)
downloadlinux-acc0f67f307f52f7aec1cffdc40a786c15dd21d9.tar.xz
tty: Halve flip buffer GFP_ATOMIC memory consumption
tty flip buffers use GFP_ATOMIC allocations for received data which is to be processed by the line discipline. For each byte received, an extra byte is used to indicate the error status of that byte. Instead, if the received data is error-free, encode the entire buffer without status bytes. Signed-off-by: Peter Hurley <peter@hurleysoftware.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/tty_buffer.c')
-rw-r--r--drivers/tty/tty_buffer.c45
1 files changed, 35 insertions, 10 deletions
diff --git a/drivers/tty/tty_buffer.c b/drivers/tty/tty_buffer.c
index 08835a6dd022..3002e20e10d7 100644
--- a/drivers/tty/tty_buffer.c
+++ b/drivers/tty/tty_buffer.c
@@ -101,6 +101,7 @@ static void tty_buffer_reset(struct tty_buffer *p, size_t size)
p->next = NULL;
p->commit = 0;
p->read = 0;
+ p->flags = 0;
}
/**
@@ -229,31 +230,49 @@ void tty_buffer_flush(struct tty_struct *tty)
* tty_buffer_request_room - grow tty buffer if needed
* @tty: tty structure
* @size: size desired
+ * @flags: buffer flags if new buffer allocated (default = 0)
*
* Make at least size bytes of linear space available for the tty
* buffer. If we fail return the size we managed to find.
+ *
+ * Will change over to a new buffer if the current buffer is encoded as
+ * TTY_NORMAL (so has no flags buffer) and the new buffer requires
+ * a flags buffer.
*/
-int tty_buffer_request_room(struct tty_port *port, size_t size)
+static int __tty_buffer_request_room(struct tty_port *port, size_t size,
+ int flags)
{
struct tty_bufhead *buf = &port->buf;
struct tty_buffer *b, *n;
- int left;
+ int left, change;
b = buf->tail;
- left = b->size - b->used;
+ if (b->flags & TTYB_NORMAL)
+ left = 2 * b->size - b->used;
+ else
+ left = b->size - b->used;
- if (left < size) {
+ change = (b->flags & TTYB_NORMAL) && (~flags & TTYB_NORMAL);
+ if (change || left < size) {
/* This is the slow path - looking for new buffers to use */
if ((n = tty_buffer_alloc(port, size)) != NULL) {
+ n->flags = flags;
buf->tail = n;
b->commit = b->used;
smp_mb();
b->next = n;
- } else
+ } else if (change)
+ size = 0;
+ else
size = left;
}
return size;
}
+
+int tty_buffer_request_room(struct tty_port *port, size_t size)
+{
+ return __tty_buffer_request_room(port, size, 0);
+}
EXPORT_SYMBOL_GPL(tty_buffer_request_room);
/**
@@ -273,12 +292,14 @@ int tty_insert_flip_string_fixed_flag(struct tty_port *port,
int copied = 0;
do {
int goal = min_t(size_t, size - copied, TTY_BUFFER_PAGE);
- int space = tty_buffer_request_room(port, goal);
+ int flags = (flag == TTY_NORMAL) ? TTYB_NORMAL : 0;
+ int space = __tty_buffer_request_room(port, goal, flags);
struct tty_buffer *tb = port->buf.tail;
if (unlikely(space == 0))
break;
memcpy(char_buf_ptr(tb, tb->used), chars, space);
- memset(flag_buf_ptr(tb, tb->used), flag, space);
+ if (~tb->flags & TTYB_NORMAL)
+ memset(flag_buf_ptr(tb, tb->used), flag, space);
tb->used += space;
copied += space;
chars += space;
@@ -361,11 +382,12 @@ EXPORT_SYMBOL(tty_schedule_flip);
int tty_prepare_flip_string(struct tty_port *port, unsigned char **chars,
size_t size)
{
- int space = tty_buffer_request_room(port, size);
+ int space = __tty_buffer_request_room(port, size, TTYB_NORMAL);
if (likely(space)) {
struct tty_buffer *tb = port->buf.tail;
*chars = char_buf_ptr(tb, tb->used);
- memset(flag_buf_ptr(tb, tb->used), TTY_NORMAL, space);
+ if (~tb->flags & TTYB_NORMAL)
+ memset(flag_buf_ptr(tb, tb->used), TTY_NORMAL, space);
tb->used += space;
}
return space;
@@ -378,7 +400,10 @@ receive_buf(struct tty_struct *tty, struct tty_buffer *head, int count)
{
struct tty_ldisc *disc = tty->ldisc;
unsigned char *p = char_buf_ptr(head, head->read);
- char *f = flag_buf_ptr(head, head->read);
+ char *f = NULL;
+
+ if (~head->flags & TTYB_NORMAL)
+ f = flag_buf_ptr(head, head->read);
if (disc->ops->receive_buf2)
count = disc->ops->receive_buf2(tty, p, f, count);