| commit | 945514c44435b3a7625d0ce3cbd002b3d246b70b | [log] [tgz] |
|---|---|---|
| author | Jens Axboe <axboe@kernel.dk> | Fri Oct 25 19:05:54 2013 +0100 |
| committer | Jens Axboe <axboe@kernel.dk> | Fri Oct 25 19:05:54 2013 +0100 |
| tree | 1b19e246231e6ee4a659393ef66800e1bea96a3e | |
| parent | 280d45f6c35d8d7a0fe20c36caf426e3ac139cf9 [diff] |
direct-io: only inc/dec inode->i_dio_count for file systems We don't need truncate protection for block devices, so add a flag bypassing this cache line dirtying twice for every IO. This easily contributes to 5-10% of the CPU time on high IOPS O_DIRECT testing. Cc: Christoph Hellwig <hch@infradead.org> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: akpm@linux-foundation.org Signed-off-by: Jens Axboe <axboe@kernel.dk>