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It's been known for a while that the use of multiple lists that are periodically merged was an algorithmic problem within btrfs. There are several workloads that don't complete in any reasonable amount of time (e.g. btrfs/130) and others that cause soft lockups. The solution is to use a set of rbtrees that do insertion merging for both indirect and direct refs, with the former converting refs into the latter. The result is a btrfs/130 workload that used to take several hours now takes about half of that. This runtime still isn't acceptable and a future patch will address that by moving the rbtrees higher in the stack so the lookups can be shared across multiple calls to find_parent_nodes. Signed-off-by: Edmund Nadolski <enadolski@suse.com> Signed-off-by: Jeff Mahoney <jeffm@suse.com> Reviewed-by: Liu Bo <bo.li.liu@oracle.com> Signed-off-by: David Sterba <dsterba@suse.com> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.