From: Miklos Szeredi <mszeredi@xxxxxxx> The function do_lo_send_aops() should call balance_dirty_pages_ratelimited() after each page similarly to generic_file_buffered_write(). Without this, writing the loop device directly (not through a filesystem) is very slow, and also slows the whole system down, because nr_dirty is constantly over the limit. Beware: this patch without the fix to balance_dirty_pages() makes a loopback mounted filesystem prone to deadlock. Signed-off-by: Miklos Szeredi <mszeredi@xxxxxxx> --- Index: linux/drivers/block/loop.c =================================================================== --- linux.orig/drivers/block/loop.c 2007-02-27 14:40:55.000000000 +0100 +++ linux/drivers/block/loop.c 2007-02-27 14:41:08.000000000 +0100 @@ -275,6 +275,8 @@ static int do_lo_send_aops(struct loop_d pos += size; unlock_page(page); page_cache_release(page); + balance_dirty_pages_ratelimited(mapping); + cond_resched(); } ret = 0; out: -- - To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
