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b0975c47c2
The various internal size limit macros have names and/or values that do not fit well to their current usage. Rename the macros so that their purpose is clear and, if needed, provide a more appropriate value. In general, the new macros and values will lead to less memory usage. The new macros are... PRINTK_MESSAGE_MAX: This is the maximum size for a formatted message on a console, devkmsg, or syslog. It does not matter which format the message has (normal or extended). It replaces the use of CONSOLE_EXT_LOG_MAX for console and devkmsg. It replaces the use of CONSOLE_LOG_MAX for syslog. Historically, normal messages have been allowed to print up to 1kB, whereas extended messages have been allowed to print up to 8kB. However, the difference in lengths of these message types is not significant and in multi-line records, normal messages are probably larger. Also, because 1kB is only slightly above the allowed record size, multi-line normal messages could be easily truncated during formatting. This new macro should be significantly larger than the allowed record size to allow sufficient space for extended or multi-line prefix text. A value of 2kB should be plenty of space. For normal messages this represents a doubling of the historically allowed amount. For extended messages it reduces the excessive 8kB size, thus reducing memory usage needed for message formatting. PRINTK_PREFIX_MAX: This is the maximum size allowed for a record prefix (used by console and syslog). It replaces PREFIX_MAX. The value is left unchanged. PRINTKRB_RECORD_MAX: This is the maximum size allowed to be reserved for a record in the ringbuffer. It is used by all readers and writers with the printk ringbuffer. It replaces LOG_LINE_MAX. Previously this was set to "1kB - PREFIX_MAX", which makes some sense if 1kB is the limit for normal message output and prefixes are enabled. However, with the allowance of larger output and the existence of multi-line records, the value is rather bizarre. Round the value up to 1kB. Signed-off-by: John Ogness <john.ogness@linutronix.de> Reviewed-by: Petr Mladek <pmladek@suse.com> Signed-off-by: Petr Mladek <pmladek@suse.com> Link: https://lore.kernel.org/r/20230109100800.1085541-9-john.ogness@linutronix.de |
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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.