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

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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>

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Kuanling Huang 2017-09-15 16:47:45 +08:00 • committed by David Sterba

parent 785884fc31

commit eef16ba269

1 changed files with 16 additions and 5 deletions

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fs/btrfs/send.c

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