It will be tested for setting wbc.nr_segments, lower the flush priority for NFS, and maybe more in future. Signed-off-by: Wu Fengguang --- fs/fs-writeback.c | 1 + fs/nfs/write.c | 2 +- include/linux/writeback.h | 1 + 3 files changed, 3 insertions(+), 1 deletion(-) --- linux.orig/fs/fs-writeback.c 2009-10-06 23:38:56.000000000 +0800 +++ linux/fs/fs-writeback.c 2009-10-06 23:39:27.000000000 +0800 @@ -783,6 +783,7 @@ static long wb_writeback(struct bdi_writ .sync_mode = args->sync_mode, .older_than_this = NULL, .for_kupdate = args->for_kupdate, + .for_background = args->for_background, .range_cyclic = args->range_cyclic, }; unsigned long oldest_jif; --- linux.orig/include/linux/writeback.h 2009-10-06 23:38:52.000000000 +0800 +++ linux/include/linux/writeback.h 2009-10-06 23:39:27.000000000 +0800 @@ -61,6 +61,7 @@ struct writeback_control { unsigned nonblocking:1; /* Don't get stuck on request queues */ unsigned encountered_congestion:1; /* An output: a queue is full */ unsigned for_kupdate:1; /* A kupdate writeback */ + unsigned for_background:1; /* A background writeback */ unsigned for_reclaim:1; /* Invoked from the page allocator */ unsigned range_cyclic:1; /* range_start is cyclic */ unsigned more_io:1; /* more io to be dispatched */ --- linux.orig/fs/nfs/write.c 2009-10-06 23:38:44.000000000 +0800 +++ linux/fs/nfs/write.c 2009-10-06 23:39:27.000000000 +0800 @@ -178,7 +178,7 @@ static int wb_priority(struct writeback_ { if (wbc->for_reclaim) return FLUSH_HIGHPRI | FLUSH_STABLE; - if (wbc->for_kupdate) + if (wbc->for_kupdate || wbc->for_background) return FLUSH_LOWPRI; return 0; } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/