The patch titled
writeback: introduce wbc.for_background
has been added to the -mm tree. Its filename is
writeback-introduce-wbcfor_background.patch
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------------------------------------------------------
Subject: writeback: introduce wbc.for_background
From: Wu Fengguang <fengguang.wu@xxxxxxxxx>
It will lower the flush priority for NFS, and maybe more in future.
Signed-off-by: Wu Fengguang <fengguang.wu@xxxxxxxxx>
Cc: Trond Myklebust <Trond.Myklebust@xxxxxxxxxx>
Cc: Jens Axboe <jens.axboe@xxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/fs-writeback.c | 1 +
fs/nfs/write.c | 2 +-
include/linux/writeback.h | 1 +
3 files changed, 3 insertions(+), 1 deletion(-)
diff -puN fs/fs-writeback.c~writeback-introduce-wbcfor_background fs/fs-writeback.c
--- a/fs/fs-writeback.c~writeback-introduce-wbcfor_background
+++ a/fs/fs-writeback.c
@@ -731,6 +731,7 @@ 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;
diff -puN fs/nfs/write.c~writeback-introduce-wbcfor_background fs/nfs/write.c
--- a/fs/nfs/write.c~writeback-introduce-wbcfor_background
+++ a/fs/nfs/write.c
@@ -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;
}
diff -puN include/linux/writeback.h~writeback-introduce-wbcfor_background include/linux/writeback.h
--- a/include/linux/writeback.h~writeback-introduce-wbcfor_background
+++ a/include/linux/writeback.h
@@ -49,6 +49,7 @@ 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 */
_
Patches currently in -mm which might be from fengguang.wu@xxxxxxxxx are
writeback-remove-unused-nonblocking-and-congestion-checks-xfs.patch
writeback-remove-the-always-false-bdi_cap_writeback_dirty-test.patch
writeback-introduce-wbcfor_background.patch
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