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[PATCH] fbcon: Use persistent allocation for cursor blinking 

Every time the console cursor blinks, we do a kmalloc/kfree pair.  This
patch turns that into a single allocation.

This allocation was the most frequent kmalloc I saw on my test box.

[adaplas]
Per Alan's suggestion, move global variables to fbcon's private structure.
This would also avoid resource leaks when fbcon is unloaded.

Signed-off-by: Dave Jones <davej@redhat.com>
Acked-by: Alan Cox <alan@redhat.com>
Signed-off-by: Antonino Daplas <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Dave Jones 2006-10-03 01:14:47 -07:00 committed by Linus Torvalds
parent 7a45093b7c
commit e299dd4d7c
3 changed files with 26 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/video/console/fbcon.c
View File

@ -3225,7 +3225,10 @@ static void fbcon_exit(void)
module_put(info->fbops->owner);
if (info->fbcon_par) {
struct fbcon_ops *ops = info->fbcon_par;
fbcon_del_cursor_timer(info);
kfree(ops->cursor_src);
kfree(info->fbcon_par);
info->fbcon_par = NULL;
}

2
drivers/video/console/fbcon.h
View File

@ -80,6 +80,8 @@ struct fbcon_ops {
char *cursor_data;
u8 *fontbuffer;
u8 *fontdata;
u8 *cursor_src;
u32 cursor_size;
u32 fd_size;
};
/*

31
drivers/video/console/softcursor.c
View File

@ -20,11 +20,12 @@
int soft_cursor(struct fb_info *info, struct fb_cursor *cursor)
{
struct fbcon_ops *ops = info->fbcon_par;
unsigned int scan_align = info->pixmap.scan_align - 1;
unsigned int buf_align = info->pixmap.buf_align - 1;
unsigned int i, size, dsize, s_pitch, d_pitch;
struct fb_image *image;
u8 *dst, *src;
u8 *dst;
if (info->state != FBINFO_STATE_RUNNING)
return 0;
@ -32,11 +33,19 @@ int soft_cursor(struct fb_info *info, struct fb_cursor *cursor)
s_pitch = (cursor->image.width + 7) >> 3;
dsize = s_pitch * cursor->image.height;
src = kmalloc(dsize + sizeof(struct fb_image), GFP_ATOMIC);
if (!src)
return -ENOMEM;
if (dsize + sizeof(struct fb_image) != ops->cursor_size) {
if (ops->cursor_src != NULL)
kfree(ops->cursor_src);
ops->cursor_size = dsize + sizeof(struct fb_image);
image = (struct fb_image *) (src + dsize);
ops->cursor_src = kmalloc(ops->cursor_size, GFP_ATOMIC);
if (!ops->cursor_src) {
ops->cursor_size = 0;
return -ENOMEM;
}
}
image = (struct fb_image *) (ops->cursor_src + dsize);
*image = cursor->image;
d_pitch = (s_pitch + scan_align) & ~scan_align;
@ -48,21 +57,23 @@ int soft_cursor(struct fb_info *info, struct fb_cursor *cursor)
switch (cursor->rop) {
case ROP_XOR:
for (i = 0; i < dsize; i++)
src[i] = image->data[i] ^ cursor->mask[i];
ops->cursor_src[i] = image->data[i] ^
cursor->mask[i];
break;
case ROP_COPY:
default:
for (i = 0; i < dsize; i++)
src[i] = image->data[i] & cursor->mask[i];
ops->cursor_src[i] = image->data[i] &
cursor->mask[i];
break;
}
} else
memcpy(src, image->data, dsize);
memcpy(ops->cursor_src, image->data, dsize);
fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, image->height);
fb_pad_aligned_buffer(dst, d_pitch, ops->cursor_src, s_pitch,
image->height);
image->data = dst;
info->fbops->fb_imageblit(info, image);
kfree(src);
return 0;
}