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Maxim Patlasov authored
Re-work fi->writepages, replacing list with rb-tree. This improves performance because kernel fuse iterates through fi->writepages for each writeback page and typical number of entries is about 800 (for 100MB of fuse writeback). Before patch: 10240+0 records in 10240+0 records out 10737418240 bytes (11 GB) copied, 41.3473 s, 260 MB/s 2 1 0 57445400 40416 6323676 0 0 33 374743 8633 19210 1 8 88 3 0 29.86% [kernel] [k] _raw_spin_lock 26.62% [fuse] [k] fuse_page_is_writeback After patch: 10240+0 records in 10240+0 records out 10737418240 bytes (11 GB) copied, 21.4954 s, 500 MB/s 2 9 0 53676040 31744 10265984 0 0 64 854790 10956 48387 1 6 88 6 0 23.55% [kernel] [k] copy_user_enhanced_fast_string 9.87% [kernel] [k] __memcpy 3.10% [kernel] [k] _raw_spin_lock Signed-off-by: Maxim Patlasov <mpatlasov@virtuozzo.com> Signed-off-by: Vasily Averin <vvs@virtuozzo.com> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
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