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sna: The device fd is marked as non-blocking so beware the busy-wait 

During redisplay we wait for the pageflip result. If the fd is marked as
non-blocking this results in a busy-wait, so insert a poll first to
remove the busy-wait.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2013-10-04 09:07:30 +01:00
parent be17746549
commit aa439ffee4
1 changed files with 10 additions and 1 deletions
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11
src/sna/sna_display.c
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@ -155,6 +155,14 @@ static bool sna_mode_has_pending_events(struct sna *sna)
return poll(&pfd, 1, 0) == 1;
}
static bool sna_mode_wait_for_event(struct sna *sna)
{
struct pollfd pfd;
pfd.fd = sna->kgem.fd;
pfd.events = POLLIN;
return poll(&pfd, 1, -1) == 1;
}
#define BACKLIGHT_CLASS "/sys/class/backlight"
/* Enough for 10 digits of backlight + '\n' + '\0' */
@ -4228,7 +4236,8 @@ disable:
}
if (sna->mode.shadow) {
while (sna->mode.shadow_flip)
while (sna->mode.shadow_flip &&
sna_mode_wait_for_event(sna))
sna_mode_wakeup(sna);
(void)sna->render.copy_boxes(sna, GXcopy,
sna->front, new, 0, 0,