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For unlink transactions and block group removal btrfs_start_transaction_fallback_global_rsv will first try to start an ordinary transaction and if it fails it will fall back to reserving the required amount by stealing from the global reserve. This is problematic because of all the same reasons we had with previous iterations of the ENOSPC handling, thundering herd. We get a bunch of failures all at once, everybody tries to allocate from the global reserve, some win and some lose, we get an ENSOPC. Fix this behavior by introducing BTRFS_RESERVE_FLUSH_ALL_STEAL. It's used to mark unlink reservation. To fix this we need to integrate this logic into the normal ENOSPC infrastructure. We still go through all of the normal flushing work, and at the moment we begin to fail all the tickets we try to satisfy any tickets that are allowed to steal by stealing from the global reserve. If this works we start the flushing system over again just like we would with a normal ticket satisfaction. This serializes our global reserve stealing, so we don't have the thundering herd problem. Reviewed-by: Nikolay Borisov <nborisov@suse.com> Tested-by: Nikolay Borisov <nborisov@suse.com> Signed-off-by: Josef Bacik <josef@toxicpanda.com> Signed-off-by: David Sterba <dsterba@suse.com> |
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| drivers | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
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| .clang-format | ||
| .cocciconfig | ||
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| README | ||
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
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.