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authorStefan Behrens <sbehrens@giantdisaster.de>2012-02-03 14:20:04 +0400
committerJosef Bacik <josef@redhat.com>2012-05-30 18:23:43 +0400
commit3d136a1131c66f7d26fb171e4c5b0b8baacd3129 (patch)
treee09f9a755e05fc2a6e21ef87762f5f1f979320f6 /fs/btrfs/reada.c
parent5bdbeb2187a99d690b374a8c5ec9911fcbcfe739 (diff)
downloadlinux-3d136a1131c66f7d26fb171e4c5b0b8baacd3129.tar.xz
Btrfs: set ioprio of scrub readahead to idle
Reduce ioprio class of scrub readahead threads to idle priority. This setting is fixed. This priority has shown the best performance during all measurements. Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de>
Diffstat (limited to 'fs/btrfs/reada.c')
-rw-r--r--fs/btrfs/reada.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/btrfs/reada.c b/fs/btrfs/reada.c
index ac5d01085884..48a4882d8ad5 100644
--- a/fs/btrfs/reada.c
+++ b/fs/btrfs/reada.c
@@ -718,13 +718,18 @@ static void reada_start_machine_worker(struct btrfs_work *work)
{
struct reada_machine_work *rmw;
struct btrfs_fs_info *fs_info;
+ int old_ioprio;
rmw = container_of(work, struct reada_machine_work, work);
fs_info = rmw->fs_info;
kfree(rmw);
+ old_ioprio = IOPRIO_PRIO_VALUE(task_nice_ioclass(current),
+ task_nice_ioprio(current));
+ set_task_ioprio(current, BTRFS_IOPRIO_READA);
__reada_start_machine(fs_info);
+ set_task_ioprio(current, old_ioprio);
}
static void __reada_start_machine(struct btrfs_fs_info *fs_info)