The patch titled block/ps3: fix slow VRAM IO has been removed from the -mm tree. Its filename was block-ps3-fix-slow-vram-io.patch This patch was dropped because it was merged into mainline or a subsystem tree The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/ ------------------------------------------------------ Subject: block/ps3: fix slow VRAM IO From: Hideyuki Sasaki <Hideyuki_Sasaki@xxxxxxxxxxxxxxxxxx> The current PS3 VRAM driver uses msleep() to wait for completion of RSX DMA transfers between system memory and VRAM. Depending on the system timing, the processing delay and overhead of this msleep() call can significantly impact VRAM driver IO. To avoid the condition, add a short duration (200 usec max) udelay() polling loop before entering the msleep() polling loop. Signed-off-by: Hideyuki Sasaki <xhide@xxxxxxxxxxxxxxxxxx> Signed-off-by: Geoff Levand <geoffrey.levand@xxxxxxxxxxx> Acked-by: Jim Paris <jim@xxxxxxxx> Cc: Jens Axboe <jens.axboe@xxxxxxxxxx> Cc: Geert Uytterhoeven <Geert.Uytterhoeven@xxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- drivers/block/ps3vram.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff -puN drivers/block/ps3vram.c~block-ps3-fix-slow-vram-io drivers/block/ps3vram.c --- a/drivers/block/ps3vram.c~block-ps3-fix-slow-vram-io +++ a/drivers/block/ps3vram.c @@ -123,7 +123,15 @@ static int ps3vram_notifier_wait(struct { struct ps3vram_priv *priv = ps3_system_bus_get_drvdata(dev); u32 *notify = ps3vram_get_notifier(priv->reports, NOTIFIER); - unsigned long timeout = jiffies + msecs_to_jiffies(timeout_ms); + unsigned long timeout; + + for (timeout = 20; timeout; timeout--) { + if (!notify[3]) + return 0; + udelay(10); + } + + timeout = jiffies + msecs_to_jiffies(timeout_ms); do { if (!notify[3]) _ Patches currently in -mm which might be from Hideyuki_Sasaki@xxxxxxxxxxxxxxxxxx are linux-next.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html