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vgacon: optimize scrolling

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Join multiple scr_memcpyw into 1-3 calls (usually 2).  (benchmarked
average speedup: 1%)

Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Cc: Krzysztof Helt <krzysztof.h1@poczta.fm>
Cc: Antonino Daplas <adaplas@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Marcin Slusarz 2008-10-15 22:03:49 -07:00 committed by Linus Torvalds
parent 1a3b09dc9a
commit c38182a713
1 changed files with 14 additions and 11 deletions
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25
drivers/video/console/vgacon.c
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@ -292,23 +292,26 @@ static int vgacon_scrolldelta(struct vc_data *c, int lines)
d = (void *) c->vc_origin;
s = (void *) c->vc_screenbuf;
while (count--) {
scr_memcpyw(d, vgacon_scrollback + soff, c->vc_size_row);
d += c->vc_size_row;
soff += c->vc_size_row;
if (count) {
int copysize;
count *= c->vc_size_row;
/* how much memory to end of buffer left? */
copysize = min(count, vgacon_scrollback_size - soff);
scr_memcpyw(d, vgacon_scrollback + soff, copysize);
d += copysize;
count -= copysize;
if (soff >= vgacon_scrollback_size)
soff = 0;
if (count) {
scr_memcpyw(d, vgacon_scrollback, count);
d += count;
}
}
if (diff == c->vc_rows) {
vgacon_cursor(c, CM_MOVE);
} else {
while (diff--) {
scr_memcpyw(d, s, c->vc_size_row);
d += c->vc_size_row;
s += c->vc_size_row;
}
if (diff)
scr_memcpyw(d, s, diff * c->vc_size_row);
}
return 1;