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26f77fd
2012 May 16
0
[RESEND PATCH] Btrfs: set ioprio of scrub readahead to idle
.... This priority has shown the best performance
during all measurements.
Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de>
---
fs/btrfs/ctree.h | 3 +++
fs/btrfs/reada.c | 5 +++++
2 files changed, 8 insertions(+)
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index ec42a24..e6f772d 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -173,6 +173,9 @@ static int btrfs_csum_sizes[] = { 4, 0 };
#define BTRFS_FT_XATTR 8
#define BTRFS_FT_MAX 9
+/* ioprio of readahead is set to idle */
+#define BTRFS_IOPRIO_READA (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0))
+
/*
* The key...