The patch titled block/ps3: fix slow VRAM IO has been added to the -mm tree. Its filename is block-ps3-fix-slow-vram-io.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/SubmitChecklist when testing your code *** See http://userweb.kernel.org/~akpm/stuff/added-to-mm.txt to find out what to do about this 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 block-ps3-fix-slow-vram-io.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