This patch series cleans up several unconventional buffer uses to avoid using cached buffers, and then converts the buffer cache indexing to use a set of per-ag rbtrees rather than a hash. This version show no performance degradation on my 1.1TB filesystem under parallel create and unlink compared to the existing enlarged hash cache. In both cases _xfs_buf_find() is consuming 5-6% of the entire CPU time of the workload. This patchset is needed to prepare for moving away from using the page cache as the backing cache and instead maintaining a LRU of cached buffers. This is necessary because on larger filesystems we are completely unable to maintain the working set of metadata buffers hot in cache as we cannot control page cache reclaim. It means that we need to be able to hold a lot more buffers in memory than we currently do and as such the hash based indexing needs replacing first. _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
