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a36e0ab44c
If the discard mount option is enabled, the file's clusters are discarded when the clusters are freed. Discarding clusters one by one will significantly reduce performance. Poor performance may cause soft lockup when lots of clusters are freed. This commit improves performance by discarding contiguous clusters in batches. Measure the performance by: # truncate -s 80G /mnt/file # time rm /mnt/file Without this commit: real 4m46.183s user 0m0.000s sys 0m12.863s With this commit: real 0m1.661s user 0m0.000s sys 0m0.017s Signed-off-by: Yuezhang Mo <Yuezhang.Mo@sony.com> Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
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 reStructuredText 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.