ext4: use bio layer instead of buffer layer in mpage_da_submit_io
Call the block I/O layer directly instad of going through the buffer
layer. This should give us much better performance and scalability,
as well as lowering our CPU utilization when doing buffered writeback.
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 8a24e9b..e13b3c3 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -4769,9 +4769,12 @@
int err;
ext4_check_flag_values();
- err = init_ext4_system_zone();
+ err = init_ext4_pageio();
if (err)
return err;
+ err = init_ext4_system_zone();
+ if (err)
+ goto out5;
ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj);
if (!ext4_kset)
goto out4;
@@ -4812,6 +4815,8 @@
kset_unregister(ext4_kset);
out4:
exit_ext4_system_zone();
+out5:
+ exit_ext4_pageio();
return err;
}
@@ -4827,6 +4832,7 @@
remove_proc_entry("fs/ext4", NULL);
kset_unregister(ext4_kset);
exit_ext4_system_zone();
+ exit_ext4_pageio();
}
MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");