tree f7293754eb9652741d9516475d6282716efcc938
parent 785884fc31883a11e88710d89c525bb7f76e33df
author Kuanling Huang <peterh@synology.com> 1505465265 +0800
committer David Sterba <dsterba@suse.com> 1509362877 +0100

Btrfs: send, apply asynchronous page cache readahead to enhance page read

By analyzing the perf on btrfs send, we found it take large amount of
cpu time on page_cache_sync_readahead. This effort can be reduced after
switching to asynchronous one. Overall performance gain on HDD and SSD
were 9 and 15 percent if simply send a large file.

Signed-off-by: Kuanling Huang <peterh@synology.com>
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>