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Free_sampling_buffer() releases the Sampling Data Buffers (SDBs) and Sampling Data Buffer Table (SDBTs) allocated at event initialization. Both buffers are of PAGE_SIZE bytes. Each SDBT consists of 512 entries. The first 511 entries point to SDBs the last entry points to a successor SDBT. The last SDBT in the list points to the origin of all SDBTs. SDBTs do not contain holes, that is an entry always points to a SDB. If less than 511 SDBs have been allocation, the last entry points to the origin SDBT. Simplify the release of the SDBs and SDBTs, walk along the SDBT chain, release SDBs and SDBTs and stop when reaching the origin again. Signed-off-by: Thomas Richter <tmricht@linux.ibm.com> Reviewed-by: Sumanth Korikkar <sumanthk@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com> |
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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 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.